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victorbravo(at)sbcglobal. Guest
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Posted: Tue Aug 21, 2018 7:56 pm Post subject: Kolb-List:Stabilizer Angle |
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My proposed order of modifications is as follows:
First, I want to put the windshield on, because that is one of the big differences between a "normal" Kolb and mine. Perhaps this will push the nose down a little bit. It will also add a few pounds to the front, which cannot hurt. John H mentioned that it was unlikely that the windshield would make a big difference, so I am not expecting a miracle, but the windshield adds comfort anyway and it's easy to put it on.
Second, if the windshield does not do much, I will try the suggestion that John H and several others made, droop the ailerons a tiny little bit at a time and see if that brings the nose down. If it does bring the nose down without making the Firestar noticeably slower, then I will continue drooping the ailerons and lowering the stabilizer angle a little bit at a time. That will make a lot of people less nervous about this particular Kolb.
Although the CG is within the factory spec, the third option is that I can start looking into what it will take to move the fuel tanks forward. This is not the most desirable option for me, because it will require structural modification and cutting perfectly good fabric off of the fuselage. But the way it is now I cannot allow other pilots lighter than me to fly the aircraft safely, and if I keep losing weight like I should then it will get closer and closer to being tail-heavy for real. This also seems to not make sense, because no other Kolbs that I know of NEEDED to move the fuel forward. I have seen website photos of Kolb owners that did it, but there are hundreds and hundreds of Kolbs that did not NEED this in order to balance the aircraft.
There are several other options and possibilities, but none of these directly answer the big mystery of how and why a Firestar that is within the factory CG range, with a 210 pound pilot, would need a nose-down push on the stick.
Bill Berle
www.ezflaphandle.com - safety & performance upgrade for light aircraft
www.grantstar.net - winning proposals for non-profit and for-profit entities
--------------------------------------------
On Mon, 8/20/18, Bill Berle <victorbravo(at)sbcglobal.net> wrote:
Subject: Re: Kolb-List:Stabilizer Angle
To: kolb-list(at)matronics.com
Date: Monday, August 20, 2018, 8:30 PM
Berle <victorbravo(at)sbcglobal.net>
Guys thank you all again for going down
this bizarre rabbit hole with me.
The aircraft flies reasonably well as
it is now, with stabilizer jacked up "way too high" and
additional trim tabs on the elevator. If I lowered the
stabilizer back down then I would be going back to holding a
lot of forward pressure on the stick, which I do not need or
want to do.The only other option is a very very large trim
tab ont he elevator, which would likely be 10-12% of the
size of the elevator. This is also a lot less desirable to
me. A large trim tab adds weight on the un-safe side of the
elevator (for flutter issues),a nd also drags in the weeds
when you are on the ground.
Again, as it is right now I have 4
degrees of positive "decalage" angle at my current setting.
This is relatively safe and very similar to Cessnas and J-3
Cubs and other "regular" airplanes.This tells me that the
stock plans-built Kolb has something a lot more than that,
maybe 8 or 10 degrees of decalage??? Wouldn't THAT sound
excessive ?
I have not heard back from Duane at
Kolb Aircraft. When we last spoke he said he would talk with
Bryan and get back to me via e-mail. I have no idea if they
have just not gotten to it yet, or whether Bryan decideed
that me and my airplane were just too crazy to get involved
with
Forgive me for being repetitive, but
for reference, at this stage we have the following known
configuration:
Wing incidence measurement is almost
perfectly matched to the measurement given to me by Duane at
Kolb.
Tail boom tube length has not been
shortened form a stock Firestar 2.
Fuselage tube structure is not
obviously bent or patched, so the "upward angle" of the boom
tube is likely the same as a stock FS2.
Weight and balance verified at 34.15%
of chord, clearly within Kolb's acceptable range for safe
filght (20-37 %).
One or two people have suggested that
perhaps my exhaust coming out of the muffler is creating
anose-up pitch, because the muffler is underneath the
aircraft. I do not believe this is the case, because I have
flown at low power settings, and the nose did not fall
downward (which it would have done if the muffler "thrust"
was lifting the nose).
Perhaps all the effort I put in over
months of screwing around, to keep the thrust line as low as
possible, has hurt me ? If the Kolb wing and stabilizer
angle were designed for a thrust line that was farther above
the aircraft , and mine is a lot lower, then THAT would
perhaps explain how there is a nose-up pitch... because the
designers at Kolb were assuming I would have a higher thrust
line that would push the nose down some ???
My thurst line (center of propeller) is
33.25 inches above the TOP of the tailboom tube. Is this
significantly LOWER than most of the other Firestars? What
is the height of the center or the prop above other Kolbers
Firestar tailboom tubes?
If everybody else's thrust line is 36
or 38 inches above the tailoom tube, then everyone else
would have the engine pushing the nose down more than I do.
If Kolb designed the Firestar's wing and tail angles for a
thrust oline that was 36 or 38 inches high, and I only have
33.25 inches, then at least THAT would explain why my
aircraft wanted to pitch upward and the other Kolbers don't
have that problem.
Another possibility is that having any
windshield on the aircraft creates a nose-down pitch, and
since I have no windshield then that nose-down pitch is
missing on my aircraft.Again this sounds implausible, but it
would explain this strange situation.
Also, I have never flown mine without
the VG's on the wing or tail. I had them on the first
flight. Any Kolbers who have installed VG's... did this
cause your aircraft to start pitching up where it did not do
that without VG's???
Bill Berle
www.ezflaphandle.com - safety &
performance upgrade for light aircraft
www.grantstar.net -
winning proposals for non-profit and for-profit entities
--------------------------------------------
On Mon, 8/20/18, George Helton <gdhelton(at)gmail.com>
wrote:
Subject: Re: Kolb-List:Stabilizer
Angle
To: kolb-list(at)matronics.com
Date: Monday, August 20, 2018, 7:51
PM
George
Helton <gdhelton(at)gmail.com>
Bill, those figures don’t sound
that
bad to me. I’m running a different
engine of course. My
original Firestar’s best climb rate
is right at 45/46 mph.
Straight and level 5500 rpm in calm
air is 64/66 mph. That
does require lots of forward stick
pressure. It likes to
cruise at 4800 to 5200rpm (at) 52/55 mph.
Obviously we’re
running two completely different
engines. My max. hp is 40 (at)
5500rpm, that’s what I consider max.
rpm even though
it’s actually 5800. My max. torque
is 49ft.lbs (at) 4800.
So, airframe-wise( I don’t think
that’s actually a word?) I think the
performance numbers
are in the ballpark. It would be nice
to bring the
horizontal stabilizer back where it
belongs. But, it’s
your decision. Keep tinkering. And
enjoy some flying.
Aero liftstruts? They claim 6 to 8
mph.
But, that sounds alittle iffy to me?
But, I did order a set
of 3:1 aero fairings for mine so
I’ll let you know how
they work, like maybe next week. I
think I just threw some
money down the drain?
George H.
Firestar, FS100, 2702 Hirth
14GDH
Mesick, Michigan
gdhelton(at)gmail.com
Sent from my iPhone
> On Aug 20, 2018, at 9:58 PM,
Bill
<victorbravo(at)sbcglobal.net>
wrote:
>
> --> Kolb-List message posted
by: Bill <victorbravo(at)sbcglobal.net>
>
> Full throttle on takeoff and
climbout gives me 5700-5800 rpm
which is max
continuous power. This yields 40-45mph
climbing. I have not
done extended full power in level
flight yet but based on
what I have seen so far I would expect
50-52mph and 6000
rpm. Brand new Tiny Tach installed per
direct verbal
installation instructions on the
phone with their tech
guy. Airspeed indicator tested with
this same air probe
stuck out thru the car sunroof,
measured same as my car
speedometer. Unless experienced
Kolbers suggest otherwise, I
will put on the short windshield as
the next change. How
much speed is typical improvement
going from round to
streamline struts??
>
> Sent from my Samsung
Captivate(tm)
on AT&T
>
> Stuart Harner <stuart(at)harnerfarm.net>
wrote:
>
>> --> Kolb-List message
posted by: "Stuart Harner" <stuart(at)harnerfarm.net>
>>
>> Bill,
>>
>> Very glad it is not a CG
problem and that it has been
definitively ruled out. Sorry
for the extra work, but the symptoms
called for the effort
to be expended.
>>
>> So now, we know that
changing
the angle of the horizontal
stabilizers helped with the
issue considerably even if it is "out
of spec".
>>
>> We have already discussed
the
wing center section gap seal, and that
would be my next area
of experimentation. After all you can
change that without
making any structural changes and it
is easy to go back to
what you have.
>>
>> Another thought has occurred
to me about your low airspeeds. A few
questions:
>>
>> Have you done a static full
power run to make sure you are getting
proper RPM's?
>> Or
>> Have you done a full power
run
in the air while straight and level?
>>
>> Have you confirmed your
tachometer with another device?
>>
>> Have you confirmed your ASI
(I
know you changed the pitot/static
setup) to verify that you
are truly getting what you are
seeing?
>>
>> Idea for next flight. While
straight and level, go to full
throttle and see what
happens. You only have to maintain it
long enough to get a
stable tachometer reading and to see
what forces are
required at the stick.
>>
>> At this point I am just
tossing out random thoughts in hopes
that something ticks in
your mind to say "hey, what if I did
this?".
>>
>> Hang in there, we're all
pulling for you to figure this out.
>>
>> Some people like mysteries,
I
rather tent to like the solutions!
>>
>> Keep us informed,
>>
>> Stuart
>>
>> --
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rickofudall
![](images/avatars/6819866474ce9fe39455d6.jpg)
Joined: 19 Sep 2009 Posts: 1392 Location: Udall, KS, USA
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Posted: Tue Aug 21, 2018 9:26 pm Post subject: Kolb-List:Stabilizer Angle |
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Bill, Can't speak for the Firestar but I expect it would be similar to the Mk III. A proper gap seal and covering the lower frame on the Mk III DOUBLED its climb rate and greatly relieved stick pressure. The PFH had the opposite pitch issue, she was a lawn dart. I reset the wing angle of incidence to the least angle recommended by Kolb and lowered the horizontal stabilizer incidence and she still needed small trim tabs on the elevators. Then she flew with fingertip pressure on the stick.When you do get the HS where you want it, consider making seals for the gap between the HS and the boom tube. If it responds like the Mk III you'll find the rudder effectiveness much improved, to the point that you can level the wings while in a stall just like a 172, something a stock Mk III will not do.
Rick Girard
On Mon, Aug 20, 2018 at 11:41 PM, Richard Pike <thegreybaron(at)charter.net (thegreybaron(at)charter.net)> wrote:
Quote: | --> Kolb-List message posted by: "Richard Pike" <thegreybaron(at)charter.net (thegreybaron(at)charter.net)>
Adding VG's to the wing or the underside of the stab/elevator causes no pitch change.
--------
Richard Pike
Kolb MKIII N420P (420ldPoops)
Kolb Firefly Part 103 legal w/incredibly obnoxious Rotax 277
Kingsport, TN 3TN0
Forgiving is tough, being forgiven is wonderful, and God's grace really is amazing.
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victorbravo(at)sbcglobal. Guest
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Posted: Tue Aug 21, 2018 10:10 pm Post subject: Kolb-List:Stabilizer Angle |
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Thank you Rick, but can you clarify what you mean by covering the lower frame? Do you mean the lower fuselage frame below the fuel tanks, or are you referring to the frame behind the cockpit under the wing, or something else.
I have taped up the gap between the wing and aileron, including the torque tube. It seemed to make a difference but I was not set up for measuring anything.
Bill Berle
www.ezflaphandle.com - safety & performance upgrade for light aircraft
www.grantstar.net - winning proposals for non-profit and for-profit entities
--------------------------------------------
On Tue, 8/21/18, Richard Girard <aslsa.rng(at)gmail.com> wrote:
Subject: Re: Kolb-List:Stabilizer Angle
To: "kolb-list(at)matronics.com" <kolb-list(at)matronics.com>
Date: Tuesday, August 21, 2018, 9:00 AM
Bill, Can't speak
for the Firestar but I expect it would be similar to the Mk
III. A proper gap seal and covering the lower frame on the
Mk III DOUBLED its climb rate and greatly relieved stick
pressure. The PFH had the opposite pitch issue, she was a
lawn dart. I reset the wing angle of incidence to the least
angle recommended by Kolb and lowered the horizontal
stabilizer incidence and she still needed small trim tabs on
the elevators. Then she flew with fingertip pressure on the
stick.When you do get the HS where you want it,
consider making seals for the gap between the HS and the
boom tube. If it responds like the Mk III you'll find
the rudder effectiveness much improved, to the point that
you can level the wings while in a stall just like a 172,
something a stock Mk III will not do.
Rick Girard
On Mon, Aug 20, 2018
at 11:41 PM, Richard Pike <thegreybaron(at)charter.net>
wrote:
"Richard Pike" <thegreybaron(at)charter.net>
Adding VG's to the wing or the underside of the
stab/elevator causes no pitch change.
--------
Richard Pike
Kolb MKIII N420P (420ldPoops)
Kolb Firefly Part 103 legal w/incredibly obnoxious Rotax
277
Kingsport, TN 3TN0
Forgiving is tough, being forgiven is wonderful, and
God's grace really is amazing.
Read this topic online here:
http://forums.matronics.com/
viewtopic.php?p=482602#482602
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target="_blank">http://www.matronics.com/
Navigator?Kolb-List
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target="_blank">http://forums.matronics.com
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-Matt Dralle, List Admin.
rel="noreferrer"
target="_blank">http://www.matronics.com/
contribution
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--
“Blessed
are the cracked, for they shall let in the light.” Groucho
Marx
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John Hauck
![](images/avatars/12284463514b28f652ba382.jpg)
Joined: 09 Jan 2006 Posts: 4639 Location: Titus, Alabama (hauck's holler)
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Posted: Wed Aug 22, 2018 3:48 am Post subject: Kolb-List:Stabilizer Angle |
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Rick G/Kolbers:
Elevator hinges are very difficult to mount exactly centered. The result is a little fore and aft motion of the horizontal stabilizer. How do you compensate for that fore and aft movement with tail boom gap seals?
john h
mkIII
Titus, Alabama
From: owner-kolb-list-server(at)matronics.com [mailto:owner-kolb-list-server(at)matronics.com] On Behalf Of Richard Girard
Sent: Tuesday, August 21, 2018 11:01 AM
To: kolb-list(at)matronics.com
Subject: Re: Kolb-List:Stabilizer Angle
When you do get the HS where you want it, consider making seals for the gap between the HS and the boom tube. If it responds like the Mk III you'll find the rudder effectiveness much improved, to the point that you can level the wings while in a stall just like a 172, something a stock Mk III will not do.
Rick Girard
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MKIII/912ULS
hauck's holler
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Richard Pike
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Joined: 09 Jan 2006 Posts: 1670 Location: Blountville, Tennessee
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Posted: Wed Aug 22, 2018 6:50 am Post subject: Re: Kolb-List:Stabilizer Angle |
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Use a strip of thin aluminum angle, taper it so the front is wider than the rear. Paint it to match your airplane and glue a length of rubber u-channel along the outside edge to barely touch the stab. Allows the stab to move fore and aft a bit, and also to fold.
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_________________ Richard Pike
Kolb MKIII N420P (420ldPoops)
Kingsport, TN 3TN0
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victorbravo(at)sbcglobal. Guest
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Posted: Wed Aug 22, 2018 7:02 am Post subject: Kolb-List:Stabilizer Angle |
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On Wed, 8/22/18, John Hauck <jhauck(at)elmore.rr.com> wrote:
" Elevator hinges are very difficult to mount exactly centered. The result is a little fore and aft motion of the horizontal stabilizer. How do you compensate for that fore and aft movement with tail boom gap
seals? "
Now I understand why the stabilizer front attach brackets have a little fore-aft wiggle room in them. I always wondered why there was that extra space.
Forgive the intrusion, I cannot answer for Rick, but I can add something similar that works from my experience with gliders. We use "wiper seals" or "wiper fairings" on a lot of control surfaces. The sealing material or fairing attached to one of the surfaces and just SLIDES on the other moving part with a small amount of pressure holding it in place.
Same principle as a garage door seal, where it cannot be attached to both the garage door and the floor. So the bottom of the seal slides on the floor as you open the garage door.
In the case of the Kolb stabilizer, the seal also has to allow the stabilizer to fold upward for storage.
One easy way to do this is to put weatherstrip foam tape on the "root rib" tube of the stabilizer. Use thick enough weatherstrip that the non-adhesive edge of the tape contacts the tailboom tube. Apply a layer of smooth tape over this weatherstripping such that it is "wrapped around" from the top edge of the stabilizer around the weatherstrip and then down around to the bottom edge of the stabilizer.
The tape is stuck only to the stabilizer and the weatherstrip, and it is NOT stuck or attached to the boom tube. The outside non-sticky smooth side of the tape slides against the boom tube, held in place by the weatherstripping foam as a "spring".
So when the stabilizer moves fore and aft the tape just slides agaainst the boom tube, and when you fold up the tail for storage the seal just rotates out of the way without interfering with the folding.
Because the stabilizer is at some angle to the boom tube, you may have to trim and shape the weatherstrip to fit against the curve of the tube... do all of this before you apply the outer layer of tape.
In practice it may turn out to be easier or more durable to mount the seal to the boom tube instead of the stabilizer root, but the principle would be the same. Slight pressure from the squishy foam weatherstrip pressing lightly against the root edge of the stabilizer. I won't know which side is better to mount the seal on until I start making seals for mine, but I am pretty confident that the principle will work.
Bill Berle
www.ezflaphandle.com - safety & performance upgrade for light aircraft
www.grantstar.net - winning proposals for non-profit and for-profit entities
--------------------------------------------
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Rex Rodebush
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Joined: 10 Jan 2006 Posts: 209 Location: Branson West area, Missouri
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Posted: Wed Aug 22, 2018 7:44 am Post subject: Re: Kolb-List:Stabilizer Angle |
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Richard and all,
I have gap seals on everything but the horiz. stabilizer to tube. Have had no problems with the rudder but am wondering if it would be worth it to add the gap seal?
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John Hauck
![](images/avatars/12284463514b28f652ba382.jpg)
Joined: 09 Jan 2006 Posts: 4639 Location: Titus, Alabama (hauck's holler)
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Posted: Wed Aug 22, 2018 8:18 am Post subject: Kolb-List:Stabilizer Angle |
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Never encountered a problem with any of my Kolbs or others because they did not have gap seals on horizontal stabilizer/tail boom or elevator/horizontal stabilizer. Not saying that it would not improve performance, but I haven't found a requirement to do so. Sort of like VGs. Over 3.400.0 hours without them. No problems flying. After installation of VGs there was an improvement in stall speed, slow speed flight, and landing. These were small improvements to an already excellent flying aircraft.
One mph, more or less, improvement if stall speed when the aircraft is stalling at 30-32 mph without them really isn't a big improvement, but it is an improvement. What difference is it going to make in the long run?
john h
mkIII
Titus, Alabama
--
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MKIII/912ULS
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Titus, Alabama |
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victorbravo(at)sbcglobal. Guest
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Posted: Wed Aug 22, 2018 9:27 am Post subject: Kolb-List:Stabilizer Angle |
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On Wed, 8/22/18, John Hauck <jhauck(at)elmore.rr.com> wrote:
What difference is it going to make in the long run?
I have no idea, it was only in response to another post regarding the tail seal. I have no idea whatsoever if it is worthwhile aerodynamically. I think he commented that a seal might make his fin or rudder more effective???
Bill Berle
www.ezflaphandle.com - safety & performance upgrade for light aircraft
www.grantstar.net - winning proposals for non-profit and for-profit entities
--------------------------------------------
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Richard Pike
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Joined: 09 Jan 2006 Posts: 1670 Location: Blountville, Tennessee
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Posted: Wed Aug 22, 2018 9:38 am Post subject: Re: Kolb-List:Stabilizer Angle |
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The only reason I gap sealed my stab to the boom tube was to possibly cut down on drag.
Nothing changed. Flies exactly the same.
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_________________ Richard Pike
Kolb MKIII N420P (420ldPoops)
Kingsport, TN 3TN0
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Jerry-TS-MkII
Joined: 23 Aug 2017 Posts: 79 Location: Indiana
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Posted: Wed Aug 22, 2018 11:00 am Post subject: Re: Kolb-List:Stabilizer Angle |
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Richard,
Re: You can do a pretty good job of streamlining the round lift struts with a length of aluminum flashing, folded over and JB Welded (Liquid Nails, double stick carpet tape, etc) to your strut, with some aluminum duct tape around the front side to seal it up. You only fair the rear side. Not ideal, but a great improvement over a round tube.
Or you can get really serious like Jack Hart: http://jackbhart.com/firefly/firefly91.html
I did look at his link. And it makes me CRINGE when I think of someone A) sealing up their most important part, and B) after sanding on the aluminum with a drywall sponge block. Every scratch, (or carbon pencil mark) on aluminum, is where it will break later!!
I have done lots of progressive composite work. The example shown was one piece, with walls as thick as paper, and it weighed the same as one sheet of paper too. While it's not a strut cover application, I'll be making similar sections which are slightly thicker, removable, and won't be scratching the struts either! My stabilizer gap seal will look like the aluminum one posted recently, but will also be of composite materials. Great stuff, no corrosion, no stress fractures!
Jerry
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John Hauck
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Joined: 09 Jan 2006 Posts: 4639 Location: Titus, Alabama (hauck's holler)
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Posted: Wed Aug 22, 2018 2:32 pm Post subject: Kolb-List:Stabilizer Angle |
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I think I was talking about a mph or two stall speed when I am already at 30-32 mph.
How accurate is my ASI indicator at those slow speeds?
john h
mkIII
Titus, Alabama
--
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_________________ John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama |
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John Hauck
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Joined: 09 Jan 2006 Posts: 4639 Location: Titus, Alabama (hauck's holler)
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Posted: Wed Aug 22, 2018 2:35 pm Post subject: Kolb-List:Stabilizer Angle |
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As I has said many times, the Kolb is the epitome of drag. Lift struts and
a 4 inch faring on the windshield did more than anything else on my FS.
After that, forget it. On the other hand fat tires/small tires made no
difference. I flew one Alaska flight with 6x6 tires and the next with 8x6.
Absolutely no difference.
john h
mkIII
Titus, Alabama
--
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_________________ John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama |
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Jerry-TS-MkII
Joined: 23 Aug 2017 Posts: 79 Location: Indiana
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Posted: Thu Aug 23, 2018 12:27 pm Post subject: Re: Kolb-List:Stabilizer Angle |
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Since several people on here were talking about strut fairings.. I just saw this link via another post, with a different topic. The fairings look great, but $$$$$!
http://uflyit.com/streamline_fairings.htm
Jerry
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ceengland7(at)gmail.com Guest
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Posted: Thu Aug 23, 2018 12:34 pm Post subject: Kolb-List:Stabilizer Angle |
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Here are some streamline struts, if anyone is interested.
http://www.carlsonaircraft.com/struts.html
On Thu, Aug 23, 2018 at 3:27 PM, Jerry-TS-MkII <12flybellaire(at)gmail.com (12flybellaire(at)gmail.com)> wrote:
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gdhelton(at)gmail.com Guest
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Posted: Thu Aug 23, 2018 1:48 pm Post subject: Kolb-List:Stabilizer Angle |
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Hi Jerry, I ordered a set of the 3:1 strut fairings last week from U-FLY-IT. They’re suppose to be be here tomorrow. I’ll let you know how they are. I’m not real sure that the increase in performance will be worth the cost? Time will tell I guess. They seem like good people and they cut them to the length that requested. No charge. That aero strut tubing looks real interesting. I just don’t know how they would compare the stock Kolb struts. Maybe someone could way in on that?George H.
Firestar, FS100, 2702 Hirth
14GDH
Mesick, Michigan
gdhelton(at)gmail.com (gdhelton(at)gmail.com)
Sent from my iPhone
On Aug 23, 2018, at 4:34 PM, Charlie England <ceengland7(at)gmail.com (ceengland7(at)gmail.com)> wrote:
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rickofudall
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Joined: 19 Sep 2009 Posts: 1392 Location: Udall, KS, USA
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Posted: Mon Aug 27, 2018 5:34 pm Post subject: Kolb-List:Stabilizer Angle |
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I shimmed the elevator so that it aligned with the pivot bolt. That eliminated the small up and down movement of the horizontal stabilizer.
Rick
On Wed, Aug 22, 2018 at 6:48 AM, John Hauck <jhauck(at)elmore.rr.com (jhauck(at)elmore.rr.com)> wrote:
Quote: |
Rick G/Kolbers:
Elevator hinges are very difficult to mount exactly centered. The result is a little fore and aft motion of the horizontal stabilizer. How do you compensate for that fore and aft movement with tail boom gap seals?
john h
mkIII
Titus, Alabama
From: owner-kolb-list-server(at)matronics.com (owner-kolb-list-server(at)matronics.com) [mailto:owner-kolb-list-server(at)matronics.com (owner-kolb-list-server(at)matronics.com)] On Behalf Of Richard Girard
Sent: Tuesday, August 21, 2018 11:01 AM
To: kolb-list(at)matronics.com (kolb-list(at)matronics.com)
Subject: Re: Kolb-List:Stabilizer Angle
When you do get the HS where you want it, consider making seals for the gap between the HS and the boom tube. If it responds like the Mk III you'll find the rudder effectiveness much improved, to the point that you can level the wings while in a stall just like a 172, something a stock Mk III will not do.
Rick Girard
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“Blessed are the cracked, for they shall let in the light.” Groucho Marx
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rickofudall
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Joined: 19 Sep 2009 Posts: 1392 Location: Udall, KS, USA
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Posted: Mon Aug 27, 2018 5:44 pm Post subject: Kolb-List:Stabilizer Angle |
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Part of the PFH experience was to qualify it for a higher maximum take off weight. With me and four 80 lb bags of cement I flew it at 1280 lb. Part of the qualification was to establish its handling in a stall. I climbed the aircraft to 4000 ft. slowed it to stall and held it there. Descent rate was somewhere north of 1000 ft per minute. I held it for over 1000 ft using only the rudder to keep the wings level. As I said, just like I did it in a 172. Before I put the seals on the horizontal stabilizer I was unable to do that at normal loading. If I recall this was noted by Rev. Pike in his Mk III as well.
Rick
On Wed, Aug 22, 2018 at 5:35 PM, John Hauck <jhauck(at)elmore.rr.com (jhauck(at)elmore.rr.com)> wrote:
[quote]--> Kolb-List message posted by: "John Hauck" <jhauck(at)elmore.rr.com (jhauck(at)elmore.rr.com)>
As I has said many times, the Kolb is the epitome of drag. Lift struts and
a 4 inch faring on the windshield did more than anything else on my FS.
After that, forget it. On the other hand fat tires/small tires made no
difference. I flew one Alaska flight with 6x6 tires and the next with 8x6.
Absolutely no difference.
john h
mkIII
Titus, Alabama
--
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