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dhkey(at)msn.com Guest
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Posted: Tue Sep 05, 2006 11:36 am Post subject: Oil Pressure question |
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Thanks for all the answers. Here's today's question, I woke up today and
taxied to the end of the runway. The oil pressure was around 8 at idle, then
I took off and climbed to 1k and the oil pressure remained around 12. I
landed asap. So where do I start now. Yes oil level looks good, no leaks.
Someone said if you have low oil pressure stop ASAP. I wonder if I let it
warm up enough on the ground. This is the first day the plane has flown in
under 95 degrees. I am checking the Rotax manuals now.
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jindoguy(at)gmail.com Guest
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Posted: Tue Sep 05, 2006 12:05 pm Post subject: Oil Pressure question |
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David, I took this right from Leading Edge Airfoils online manual:
Oil pressure:
NORMAL 58 psi (4 bar) (at) 5500 rpm, MAX 72 psi (5 bar), MIN 22 psi (1.5 bar) (at) 2800 rpm
Rick
On 9/5/06, David Key < dhkey(at)msn.com (dhkey(at)msn.com)> wrote: Quote: | --> Kolb-List message posted by: "David Key" < dhkey(at)msn.com (dhkey(at)msn.com)>
Thanks for all the answers. Here's today's question, I woke up today and
taxied to the end of the runway. The oil pressure was around 8 at idle, then
I took off and climbed to 1k and the oil pressure remained around 12. I
landed asap. So where do I start now. Yes oil level looks good, no leaks.
Someone said if you have low oil pressure stop ASAP. I wonder if I let it
warm up enough on the ground. This is the first day the plane has flown in
|
--
Rick Girard
"Ya'll drop on in"
takes on a whole new meaning
when you live at the airport. [quote][b]
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NeilsenRM(at)comcast.net Guest
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Posted: Tue Sep 05, 2006 1:43 pm Post subject: Oil Pressure question |
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David
I'm in no way a Rotax person but you have a problem. It could be nothing more than a pressure gage/sender issue but you don't know that. In general your oil pressure will be high when the engine is cold even on a 95 degree day. Once it warms it will drop to what is a normal pressure. The guide line oil pressures for Rotax are similar to my VW. I wouldn't have continued to run the engine right after start up with the oil pressure you were seeing. If my oil pressures don't start their normal climb to 65-70 lbs at cold idle I would shut the engine down NOW. You need to find out why this is happening.
Rick Neilsen
Redrive VW powered MKIIIc
[quote] ---
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John Hauck
Joined: 09 Jan 2006 Posts: 4639 Location: Titus, Alabama (hauck's holler)
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Posted: Tue Sep 05, 2006 4:28 pm Post subject: Oil Pressure question |
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The oil pressure was around 8 at idle, then
| I took off and climbed to 1k and the oil pressure remained around
12. I
| landed asap. So where do I start now.
David K:
Was wondering why you did not shut the engine down as soon as you
started it and saw that the oil pressure was 8 psi at idle?
To me, that would have been the time to be alarmed, not 1000 feet agl.
Could be:
1-in op sender, gauge, EIS, or what ever you are using.
2-put a mechanical oil pressure gauge on it and see what kind of oil
pressure you actually have.
3-double check you hoses. You are working with vacuum on the inlet
side and 3-5 psi on the return line to the tank. A tight bend can
reduce the volume of oil flow considerably.
4-try not to commit to flight when the instruments are not in the
green.
5-low and no oil pressure will kill a 912 quicker than anything else.
Take care,
john h
mkIII
PS: Normal oil pressure, hot (normal) engine and oil temp, is about
40 psi. 22 psi is minimum at idle.
Use your Rotax Operators Manual and/or go on line to Kodiak and use
their manuals. I wouldn't use the CPS or LEAF catalogs unless it was
a last resort and nothing else was available.
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_________________ John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama |
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dhkey(at)msn.com Guest
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Posted: Tue Sep 05, 2006 4:44 pm Post subject: Oil Pressure question |
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Ok, I'd like to tell you a complex thing I did, but the oil filter came a
little loose and I tightened it and all was good again. Got in an hour at
sunset.
[quote]From: "Richard & Martha Neilsen" <NeilsenRM(at)comcast.net>
Reply-To: kolb-list(at)matronics.com
To: <kolb-list(at)matronics.com>
Subject: Re: Oil Pressure question
Date: Tue, 5 Sep 2006 17:22:16 -0400
David
I'm in no way a Rotax person but you have a problem. It could be nothing
more than a pressure gage/sender issue but you don't know that. In general
your oil pressure will be high when the engine is cold even on a 95 degree
day. Once it warms it will drop to what is a normal pressure. The guide
line oil pressures for Rotax are similar to my VW. I wouldn't have
continued to run the engine right after start up with the oil pressure you
were seeing. If my oil pressures don't start their normal climb to 65-70
lbs at cold idle I would shut the engine down NOW. You need to find out why
this is happening.
Rick Neilsen
Redrive VW powered MKIIIc
---
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John Hauck
Joined: 09 Jan 2006 Posts: 4639 Location: Titus, Alabama (hauck's holler)
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Posted: Tue Sep 05, 2006 5:13 pm Post subject: Oil Pressure question |
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| Ok, I'd like to tell you a complex thing I did, but the oil filter
came a
| little loose and I tightened it and all was good again. Got in an
hour at
| sunset.
David K:
How did the oil filter get a little loose?
john h
mkIII
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_________________ John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama |
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dhkey(at)msn.com Guest
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Posted: Tue Sep 05, 2006 5:46 pm Post subject: Oil Pressure question |
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Good question. The DAR wanted me to put a worm gear on it and safty wire it.
That was the last time it was checked by hand. I took both the worm gear and
the safty wire off and now I will check it by hand on each preflight. It
looked tight each time I looked at it because the saftywire was tight but
the worm gear had slipped or wasn't on tight to begin with, can't be certian
now. There wasn't a drip of oil on the filter so someone must of been right
that there is a negative pressure there and nothing was pushing oil out.
Also I put reflex in the flaps and ailerions and have a much better crusie,
not to mention a much better stall. It pitches up in the stall now and it's
easy to see and feel.
The trim tab I built was only one bay tall and you were right that's not
enough. I've got a 45degree angle in it and still have a lot of right rudder
in a 5k cruise. Takeoffs are much better even with one bay. So I was
building it to two bays tall and everyone at the airport said there's no way
that's right. Don't put that on. There's no such thing as a plane that needs
a trim tab that big. Don't do it that way. Well we were right and now I get
to do it again.
There are less than 10 hours on the plane.
Quote: | From: "John Hauck" <jhauck(at)elmore.rr.com>
Reply-To: kolb-list(at)matronics.com
To: <kolb-list(at)matronics.com>
Subject: Re: Oil Pressure question
Date: Tue, 5 Sep 2006 20:11:48 -0500
| Ok, I'd like to tell you a complex thing I did, but the oil filter
came a
| little loose and I tightened it and all was good again. Got in an
hour at
| sunset.
David K:
How did the oil filter get a little loose?
john h
mkIII
|
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John Hauck
Joined: 09 Jan 2006 Posts: 4639 Location: Titus, Alabama (hauck's holler)
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Posted: Tue Sep 05, 2006 6:11 pm Post subject: Oil Pressure question |
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| Good question. The DAR wanted me to put a worm gear on it and safty
wire it.
| That was the last time it was checked by hand.
David K:
Glad you made out ok. Always a first time for everything. However, I
have never had an oil filter release on a 912. I tighten them by
hand, as instructed, 3/4 turn after the gasket makes contact with the
base. In all cases, I have to use the oil filter wrench to loosen
them up. Gets to be a mess when I am on a cross country and do not
have my handy oil filter wrench. Usually end up punching a hole in
the filter with a big screw driver to crack it lose.
Don't know if you have a buncha "experienced" strap hangers at your
airport or not. But..........sounds as if you do. I can assure you,
there is nothing wrong with a mkIII that requires a large trim tab,
such as the one I finally put on my mkIII. Just happens to be the
nature of the beast.
Glad the aileron, flap, reflex made your mkIII fly better.
john h
mkIII
PS: If I listened to all the strap hangers, I'd still be on the
ground waiting to fly.
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_________________ John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama |
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Jim Baker
Joined: 30 Mar 2006 Posts: 181 Location: Sayre, PA
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Posted: Tue Sep 05, 2006 7:16 pm Post subject: Oil Pressure question |
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Quote: | tighten them by
hand, as instructed, 3/4 turn after the gasket makes contact with the
base. In all cases, I have to use the oil filter wrench to loosen
them up.
|
A bit of Dow Corning DC-4 on the gasket surface will make the
job much easier at removal time.....
Jim Baker
580.788.2779
Elmore City, OK
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John Hauck
Joined: 09 Jan 2006 Posts: 4639 Location: Titus, Alabama (hauck's holler)
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Posted: Tue Sep 05, 2006 7:22 pm Post subject: Oil Pressure question |
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| A bit of Dow Corning DC-4 on the gasket surface will make the
| job much easier at removal time.....
|
| Jim Baker
Jim B:
Afraid it might get too easy to remove. Just as soon keep it
difficult, since I do not use any mechanical means for safetying it.
john h
mkIII
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_________________ John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama |
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dhkey(at)msn.com Guest
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Posted: Tue Sep 05, 2006 7:36 pm Post subject: Oil Pressure question |
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John,
If you only knew what I go through with the strap hangers... almost daily...
My problem is I'm nice and I listen. They all don't like my plane for dozens
of reasons and the newest will be that if it needs that sized trim tab then
it aint designed right. I get a new reason not to like it every three days.
I live on the airport so the neighbors are the strap hangers, they come by
like a small stream all day and night. I'm not sure what happened to
everyone else when I decided to build a plane, but they didn't get smarter.
You should of seen what happened when I ask for a second pair of eyes while
I calculated CG. I didn't ask how to do it, I ask for someone to watch me
while I did it. It got really spooky in seconds as the ideas and the beer
flowed. One guy said I had to take everything out and weigh it, he owns the
airport!!! I ask him very gently, don't you think the scales take into
account everything in the airplane. He still didn't get it, I dropped it,
while maintaining a huge silent concern for the people that didn't
understand that. I have sympathy for anyone in the building process that has
to go through that crap. I'm very surprised at the abundance of inaccurate
advise and the willingness of people to share it. I used to think that
anyone could build a Kolb, it's a very simple plane. Now I know that it's a
huge accomplishment and few have the knowlege to do it.
I realize now that the oil pressure was totally out of range and I shouldn't
of flown it. I am still new with the plane and learning the numbers. It is
normal for my EIS to show the red light when I am at low RPM's like while
taxiing. I set the limits based on flying limits. Now I know that the
numbers today were way too low. Wont happen again. Thanks for your concern.
Quote: | From: "John Hauck" <jhauck(at)elmore.rr.com>
Reply-To: kolb-list(at)matronics.com
To: <kolb-list(at)matronics.com>
Subject: Re: Oil Pressure question
Date: Tue, 5 Sep 2006 21:10:43 -0500
| Good question. The DAR wanted me to put a worm gear on it and safty
wire it.
| That was the last time it was checked by hand.
David K:
Glad you made out ok. Always a first time for everything. However, I
have never had an oil filter release on a 912. I tighten them by
hand, as instructed, 3/4 turn after the gasket makes contact with the
base. In all cases, I have to use the oil filter wrench to loosen
them up. Gets to be a mess when I am on a cross country and do not
have my handy oil filter wrench. Usually end up punching a hole in
the filter with a big screw driver to crack it lose.
Don't know if you have a buncha "experienced" strap hangers at your
airport or not. But..........sounds as if you do. I can assure you,
there is nothing wrong with a mkIII that requires a large trim tab,
such as the one I finally put on my mkIII. Just happens to be the
nature of the beast.
Glad the aileron, flap, reflex made your mkIII fly better.
john h
mkIII
PS: If I listened to all the strap hangers, I'd still be on the
ground waiting to fly.
|
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Thom Riddle
Joined: 10 Jan 2006 Posts: 1597 Location: Buffalo, NY, USA (9G0)
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Posted: Wed Sep 06, 2006 3:47 am Post subject: Oil Pressure question |
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David,
..It pitches up in the stall now and it's easy to see and feel....
Perhaps I'm misunderstanding you. Are you saying that when it stalls
the nose pitches up? Or are you saying that when pitching up the nose
(using elevator) that it stalls? If the nose pitches up in response to
a stall, rather than as the cause of the stall, you have a problem.
After a stall, nose should fall down and if the wings are fairly level
and you are not yawed to badly, the airplane will start flying again
immediately. If it automatically pitches up in response to a stall,
this is dangerous, perhaps being caused by a way too aft CG.
I hope I misunderstood you.
Thom in Buffalo
do not archive
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_________________ Thom Riddle
Buffalo, NY (9G0)
Don't worry about old age... it doesn't last very long.
- Anonymous |
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dhkey(at)msn.com Guest
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Posted: Wed Sep 06, 2006 5:20 am Post subject: Oil Pressure question |
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Restated...
When I pull back on the stick the plane pitches up then stalls. It didn't
pitch up much before.
do not archive
Quote: | From: Thom Riddle <jtriddle(at)adelphia.net>
Reply-To: kolb-list(at)matronics.com
To: kolb-list(at)matronics.com
Subject: Re: Oil Pressure question
Date: Wed, 6 Sep 2006 07:47:16 -0400
David,
...It pitches up in the stall now and it's easy to see and feel....
Perhaps I'm misunderstanding you. Are you saying that when it stalls the
nose pitches up? Or are you saying that when pitching up the nose (using
elevator) that it stalls? If the nose pitches up in response to a stall,
rather than as the cause of the stall, you have a problem.
After a stall, nose should fall down and if the wings are fairly level and
you are not yawed to badly, the airplane will start flying again
immediately. If it automatically pitches up in response to a stall, this is
dangerous, perhaps being caused by a way too aft CG.
I hope I misunderstood you.
Thom in Buffalo
do not archive
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jindoguy(at)gmail.com Guest
|
Posted: Wed Sep 06, 2006 5:44 am Post subject: Oil Pressure question |
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|
David, Have you done a weght and balance check?
Rick
On 9/6/06, David Key <dhkey(at)msn.com (dhkey(at)msn.com)> wrote:[quote] --> Kolb-List message posted by: "David Key" <dhkey(at)msn.com (dhkey(at)msn.com)>
Restated...
When I pull back on the stick the plane pitches up then stalls. It didn't
pitch up much before.
do not archive
Quote: | From: Thom Riddle <jtriddle(at)adelphia.net (jtriddle(at)adelphia.net)>
Reply-To: kolb-list(at)matronics.com (kolb-list(at)matronics.com)
To: kolb-list(at)matronics.com (kolb-list(at)matronics.com)
Subject: Re: Oil Pressure question
Date: Wed, 6 Sep 2006 07:47:16 -0400
David,
...It pitches up in the stall now and it's easy to see and feel....
Perhaps I'm misunderstanding you. Are you saying that when it stalls the
nose pitches up? Or are you saying that when pitching up the nose (using
elevator) that it stalls? If the nose pitches up in response to a stall,
rather than as the cause of the stall, you have a problem.
After a stall, nose should fall down and if the wings are fairly level and
you are not yawed to badly, the airplane will start flying again
immediately. If it automatically pitches up in response to a stall, this is
dangerous, perhaps being caused by a way too aft CG.
I hope I misunderstood you.
Thom in Buffalo
|
--
Rick Girard
"Ya'll drop on in"
takes on a whole new meaning
when you live at the airport. [quote][b]
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jindoguy(at)gmail.com Guest
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Posted: Wed Sep 06, 2006 5:46 am Post subject: Oil Pressure question |
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|
Darn, hit the send button too soon. I meant to say, have you done a weight and balance at forward and aft extremes?
Rick
On 9/6/06, David Key < dhkey(at)msn.com (dhkey(at)msn.com)> wrote:[quote]--> Kolb-List message posted by: "David Key" < dhkey(at)msn.com (dhkey(at)msn.com)>
Restated...
When I pull back on the stick the plane pitches up then stalls. It didn't
pitch up much before.
do not archive
[quote]From: Thom Riddle < jtriddle(at)adelphia.net (jtriddle(at)adelphia.net)>
Reply-To: kolb-list(at)matronics.com (kolb-list(at)matronics.com)
To: kolb-list(at)matronics.com (kolb-list(at)matronics.com)
Subject: Re: Oil Pressure question
Date: Wed, 6 Sep 2006 07:47:16 -0400
David,
...It pitches up in the stall now and it's easy to see and feel....
Perhaps I'm misunderstanding you. Are you saying that when it stalls the
nose pitches up? Or are you saying that when pitching up the nose (using
elevator) that it stalls? If the nose pitches up in response to a stall,
rather than as the cause of the stall, you have a problem.
After a stall, nose should fall down and if the wings are fairly level and
you are not yawed to badly, the airplane will start flying again
immediately. If it automatically pitches up in response to a stall, this is
when you live at the airport.
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dhkey(at)msn.com Guest
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Posted: Wed Sep 06, 2006 6:17 am Post subject: Oil Pressure question |
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|
yes. Please contact me directly for direct questions.
Quote: | From: "Richard Girard" <jindoguy(at)gmail.com>
Reply-To: kolb-list(at)matronics.com
To: kolb-list(at)matronics.com
Subject: Re: Re: Oil Pressure question
Date: Wed, 6 Sep 2006 08:44:40 -0500
David, Have you done a weght and balance check?
Rick
On 9/6/06, David Key <dhkey(at)msn.com> wrote:
>
>
>
>Restated...
>When I pull back on the stick the plane pitches up then stalls. It didn't
>pitch up much before.
>
>do not archive
> >From: Thom Riddle <jtriddle(at)adelphia.net>
> >Reply-To: kolb-list(at)matronics.com
> >To: kolb-list(at)matronics.com
> >Subject: Re: Oil Pressure question
> >Date: Wed, 6 Sep 2006 07:47:16 -0400
> >
> >David,
> >
> >...It pitches up in the stall now and it's easy to see and feel....
> >
> >Perhaps I'm misunderstanding you. Are you saying that when it stalls the
> >nose pitches up? Or are you saying that when pitching up the nose (using
> >elevator) that it stalls? If the nose pitches up in response to a stall,
> >rather than as the cause of the stall, you have a problem.
> >
> >After a stall, nose should fall down and if the wings are fairly level
>and
> >you are not yawed to badly, the airplane will start flying again
> >immediately. If it automatically pitches up in response to a stall, this
>is
> >dangerous, perhaps being caused by a way too aft CG.
> >
> >I hope I misunderstood you.
> >
> >Thom in Buffalo
> >do not archive
>
--
Rick Girard
"Ya'll drop on in"
takes on a whole new meaning
when you live at the airport.
|
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dhkey(at)msn.com Guest
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Posted: Wed Sep 06, 2006 6:39 am Post subject: Oil Pressure question |
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|
No I did a weight and balance on the plane which gives me the forward and
aft extremes. Here's are the numbers.
13.2 Extreem Forward CG
23.2 Extreem Back CG
Quote: | From: "Richard Girard" <jindoguy(at)gmail.com>
Reply-To: kolb-list(at)matronics.com
To: kolb-list(at)matronics.com
Subject: Re: Re: Oil Pressure question
Date: Wed, 6 Sep 2006 08:46:31 -0500
Darn, hit the send button too soon. I meant to say, have you done a weight
and balance at forward and aft extremes?
Rick
On 9/6/06, David Key <dhkey(at)msn.com> wrote:
>
>
>
>Restated...
>When I pull back on the stick the plane pitches up then stalls. It didn't
>pitch up much before.
>
>do not archive
> >From: Thom Riddle <jtriddle(at)adelphia.net>
> >Reply-To: kolb-list(at)matronics.com
> >To: kolb-list(at)matronics.com
> >Subject: Re: Oil Pressure question
> >Date: Wed, 6 Sep 2006 07:47:16 -0400
> >
> >David,
> >
> >...It pitches up in the stall now and it's easy to see and feel....
> >
> >Perhaps I'm misunderstanding you. Are you saying that when it stalls the
> >nose pitches up? Or are you saying that when pitching up the nose (using
> >elevator) that it stalls? If the nose pitches up in response to a stall,
> >rather than as the cause of the stall, you have a problem.
> >
> >After a stall, nose should fall down and if the wings are fairly level
>and
> >you are not yawed to badly, the airplane will start flying again
> >immediately. If it automatically pitches up in response to a stall, this
>is
> >dangerous, perhaps being caused by a way too aft CG.
> >
> >I hope I misunderstood you.
> >
> >Thom in Buffalo
> >do not archive
>
--
Rick Girard
"Ya'll drop on in"
takes on a whole new meaning
when you live at the airport.
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Ed in JXN
Joined: 24 Mar 2006 Posts: 122
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Posted: Wed Sep 06, 2006 7:04 am Post subject: Oil Pressure question |
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Hi Dave,
Welcome to the brotherhood of aviation. I feel for you, with all
the unsought opinions. That's why it's called (by some) the "Aircraft
Oglers and Polishers Association". Sounds like you're doing just fine,
listen politely and do it your way when no one's around. How long have you
been married? ;^)
Ed in JXN
MkII/503
---
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Steve Boetto
Joined: 11 Jan 2006 Posts: 365
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Posted: Wed Sep 06, 2006 7:57 am Post subject: Oil Pressure question |
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In a message dated 9/6/2006 11:06:16 AM Eastern Standard Time, edchmiel(at)mindspring.com writes:
Quote: | Welcome to the brotherhood of aviation. I feel for you, with all
the unsought opinions. |
Good point Ed, I listen to people that build and fly their own AC. You will get enough differing opinions in that arena alone.
steve b [quote][b]
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jindoguy(at)gmail.com Guest
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Posted: Wed Sep 06, 2006 8:13 am Post subject: Oil Pressure question |
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David, I'm posting to the group because I just want to make sure I understand this correctly. From page 17 of the Mk III plans forward limit is 16.5" aft limit is 23.1". This is the MkIII classic. Are we on the same page?
Rick
On 9/6/06, David Key <dhkey(at)msn.com (dhkey(at)msn.com)> wrote:[quote] --> Kolb-List message posted by: "David Key" <dhkey(at)msn.com (dhkey(at)msn.com)>
No I did a weight and balance on the plane which gives me the forward and
aft extremes. Here's are the numbers.
13.2 Extreem Forward CG
23.2 Extreem Back CG
Quote: | >
>
> >From: Thom Riddle <jtriddle(at)adelphia.net (jtriddle(at)adelphia.net)>
> >Reply-To: kolb-list(at)matronics.com (kolb-list(at)matronics.com)
> >To: kolb-list(at)matronics.com (kolb-list(at)matronics.com)
> >Subject: Re: Oil Pressure question
> >Date: Wed, 6 Sep 2006 07:47:16 -0400
> >
> >David,
> >
> >...It pitches up in the stall now and it's easy to see and feel....
> >
> >Perhaps I'm misunderstanding you. Are you saying that when it stalls the
> >nose pitches up? Or are you saying that when pitching up the nose (using
> >elevator) that it stalls? If the nose pitches up in response to a stall,
> >rather than as the cause of the stall, you have a problem.
> >
> >After a stall, nose should fall down and if the wings are fairly level
>and
> >you are not yawed to badly, the airplane will start flying again
> >immediately. If it automatically pitches up in response to a stall, this
>is
> >dangerous, perhaps being caused by a way too aft CG.
> >
> >I hope I misunderstood you.
> >
> >Thom in Buffalo
> >do not archive
>
--
Rick Girard
"Ya'll drop on in"
takes on a whole new meaning
when you live at the airport.
--
|
Rick Girard
"Ya'll drop on in"
takes on a whole new meaning
when you live at the airport. [quote][b]
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