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victorbravo(at)sbcglobal.
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 Posted: Wed Jun 29, 2016 4:08 pm Post subject: STOL question Mark 3 and Firestar |
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Since I have zero experience flying Kolbs, I desperately need the experienced pilots to answer a question.
You have a stock Kolb Mark 3 (not the 3X), and a Kolb Firestar 2 sitting next to each other. Both have the SAME engine, an HKS 60HP 4 stroke. Both have the SAME weight pilot. There is NO passenger in the Mark 3.
Which one has better STOL performance? Which one will get in and out of smaller strips? How much better is the smaller Firestar's handling and maneuverability?
While I am building my project, I have an opportunity to purchase a flyable Firestar, and I have an opportunity to purchase a flying older Mark 3, and I have an HKS 700E engine.
My desire for the airplane is 95% for off-airport STOL flying.
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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On Mon, 6/27/16, Herb <Herbgh(at)nctc.com> wrote:
Subject: Re: HKS engine
To: kolb-list(at)matronics.com
Date: Monday, June 27, 2016, 2:01 PM
Good info...I will save all the comments in a word
file...
There may be an HKS group at yahoo ? Herb
On 06/27/2016 12:52 PM,
Richard Girard
wrote:
Herb, One thing you can check is to see
if the
carbs have been changed to have the needle clip in
the fourth
(top) groove. While it won't guarantee that the
engine is a 1000
hr TBO engine, it's a good indication. Now,
while you have the
needle out, move the clip to the second groove to
stop wasting
fuel. The rationale for richening up the midrange is
to protect
the exhaust valve guide. A bit like shooting
yourself in the
foot to see if your pistol is properly sighted in.
Leaning out
the mixture in the midrange lowers EGT and improves
fuel economy
by about a gallon per hour. To protect the valve
guide I premix
MMO at one and a half oz. per gallon. Over 300 hours
on my
engine and no sign of problems. Note that the full
throttle
mixture is not changed by doing this.
You also might want to look at the throttle
linkage. The
HKS comes with motorcycle style cable throttles,
i.e. if the
cable breaks the carb goes to idle. Rotax has the
linkage
parts (or the Bing Agency in Council Groves, KS)
to change it
over to an aircraft style cable where the throttle
goes to
full if the cable breaks, instead.
Last, to protect the gear box, always cool the
engine to
below 250 degrees before shut down.
It's a really great engine.
Rick Girard
On Mon, Jun
27, 2016 at 12:25 PM, Herb
<Herbgh(at)nctc.com>
wrote:
-->
Kolb-List message posted by: Herb <Herbgh(at)nctc.com>
Thanks Larry
I will put some hours on the plane this
summer....but
likely will continue to look for a Firestar
1....
right...the engine is a keeper.... and as I
said...that
is why I bought the plane...
Now to get it from Michigan to South Cent.
Ky...
Spending the day replacing rotors,calipers and
pads on rear
of my Jeep Grand Cherokee..next onto the trailer
to grease
bearings, fix wiring and replace two of the 4
tires...
always something!! Herb
On 06/27/2016 11:20 AM, Larry Cottrell
wrote:
I can only tell you what I think, not prove.
I believe
that the extended rebuild time was more
through
experience with the engines rather than any
improvement
of them. I know that my rebuild time went up
without any
one doing any thing to improve them. Jerry (at)
Greensky
could give you the definitive answer, and he
is a good
guy!
I would also think that you would only have
to enter the
change in the log book and fly off a
probationary
period. Personally I would not sell the HKS
with the
plane, by all means put it on the plane that
you want to
keep. Three gallons per hour, increase in
speed, range
and quiet. Put a two blade warp on it
however. I ruined
one of the three blade IVO trying to put
enough twist in
it to get the right rpm. Its also very nice
not having
to mix oil with the gas.
I personally am not going to send an engine
in for a
rebuild when it is performing as it should.
I am willing
to take the risk. I don't care what the
company feels
would reduce their liability.
Larry
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Richard Pike
Joined: 09 Jan 2006
Posts: 1671
Location: Blountville, Tennessee
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| Posted: Wed Jun 29, 2016 5:44 pm Post subject: Re: STOL question Mark 3 and Firestar |
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Since I have a MKIII and a FSII (not mine, but I get to fly it) both out behind the house at the strip, and both have identical 582's with identical props, I can offer a little bit of insight.
STOL performance: the FSII is a bit lighter and so it tends to accelerate and climb out a bit better.
The MKIII has flaps which help it get into tight places a bit easier.
Handling and maneuverability is a function of fine tuning the aileron bell crank lengths to adjust control pressure. Once we got that sorted out, there is not a whole lot of difference. Both are very agile. I would probably have to go fly them both back to back to be able to really have a definite answer.
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_________________
Richard Pike
Kolb MKIII N420P (420ldPoops)
Kingsport, TN 3TN0
Forgiving is tough, being forgiven is wonderful, and God's grace really is amazing. |
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