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teamgrumman(at)yahoo.com
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 Posted: Fri Oct 07, 2011 10:09 pm Post subject: Found this on the Internet |
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My good friend (who happens to regularly loiter on this forum) recently told me that Cessna designed their planes such that if you have an engine failure, you can dial-in the maximum back elevator trim and the plane will automatically be set-up for best glide speed.
Today, while flying a Cessna 152 at about 10,000 feet, I decided to give it a try and see what my results would be. I pulled power back to idle, dialed the trim wheel all the way down, and guess what happened? The plane settled into a very nice glide at exactly 60 KIAS (best glide for the 152).
As a recently certificated pilot, I'm surprised this little "nugget of knowledge" was never mentioned during my training. Was this mentioned during anyone else's training? Is this true for all Cessna models and/or other aircraft?
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comments?
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Gary
Sent from my iPad
[quote][b]
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Grumman932TE(at)hotmail.c
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| Posted: Sat Oct 08, 2011 2:16 am Post subject: Found this on the Internet |
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Gene Whitt, an instructor of mine, taught this to his students and documented it on his web site (copied below), at [url=http://www.whittsflying.com/web/page5.61Cessna_150.htm#Trim and the C-150]http://www.whittsflying.com/web/pagE5.61Cessna_150.htm#Trim%20and%20the%20C-150[/url]
"Side Notes:
Pilots do not usually have the best-glide numbers available. A short cut is just to trim the aircraft full nose-up without flaps..."
It is true for some other Cessna models as well, but you may wish to try it in your model before you need to rely on it.
On Oct 7, 2011, at 11:07 PM, Gary L Vogt wrote:
[quote]
My good friend (who happens to regularly loiter on this forum) recently told me that Cessna designed their planes such that if you have an engine failure, you can dial-in the maximum back elevator trim and the plane will automatically be set-up for best glide speed.
Today, while flying a Cessna 152 at about 10,000 feet, I decided to give it a try and see what my results would be. I pulled power back to idle, dialed the trim wheel all the way down, and guess what happened? The plane settled into a very nice glide at exactly 60 KIAS (best glide for the 152).
As a recently certificated pilot, I'm surprised this little "nugget of knowledge" was never mentioned during my training. Was this mentioned during anyone else's training? Is this true for all Cessna models and/or other aircraft?
============
comments?
============
Gary
Sent from my iPad
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href="http://www.matronics.com/Navigator?TeamGrumman-List">http://www.matronics.com/Navigator?TeamGrumman-List
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bob.hodo(at)yahoo.com
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| Posted: Sat Oct 08, 2011 7:57 am Post subject: Found this on the Internet |
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The 172 I did my instrument training in would land itself if you maintained this setting through ground effect to touchdown. Smoothest landings I ever achieved.
Gary L Vogt <teamgrumman(at)yahoo.com> wrote:
My good friend (who happens to regularly loiter on this forum) recently told me that Cessna designed their planes such that if you have an engine failure, you can dial-in the maximum back elevator trim and the plane will automatically be set-up for best glide speed.
Today, while flying a Cessna 152 at about 10,000 feet, I decided to give it a try and see what my results would be. I pulled power back to idle, dialed the trim wheel all the way down, and guess what happened? The plane settled into a very nice glide at exactly 60 KIAS (best glide for the 152).
As a recently certificated pilot, I'm surprised this little "nugget of knowledge" was never mentioned during my training. Was this mentioned during anyone else's training? Is this true for all Cessna models and/or other aircraft?
============
comments?
============
Gary
Sent from my iPad
[quote][b]
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n32romeo(at)AOL.COM
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| Posted: Sat Oct 08, 2011 7:25 pm Post subject: Found this on the Internet |
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Hmm, I'll have to give this a try in my C-182. I learned to fly in C-150's in the 70's by what I considered to be knowlegable old-timers, and flew most of the Cessna single line from C-120s to C-206's, but don't think I have ever heard this. And thinking about it, this might be easy to achieve in a C-150, as the CG range is rather narrow with only 1 row of seats, but would not work the same in a C-172 or larger as the CG range is so much wider. My "P" model 182 has a very wide CG range.
Rich Harrison
AA-1B N1632Romeo
C-182 N52992
Dog is my Co-Pilot
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andrew(at)entro.com
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| Posted: Sun Oct 09, 2011 12:19 pm Post subject: Found this on the Internet |
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So the question that needs to be asked. Will the AA5 perform in the same way?
Andrew Kuzyk
[url=http://www.entro.com/][/url]
On Oct 8, 2011, at 11:22 PM, n32romeo(at)AOL.COM (n32romeo(at)AOL.COM) wrote:
[quote] Hmm, I'll have to give this a try in my C-182. I learned to fly in C-150's in the 70's by what I considered to be knowlegable old-timers, and flew most of the Cessna single line from C-120s to C-206's, but don't think I have ever heard this. And thinking about it, this might be easy to achieve in a C-150, as the CG range is rather narrow with only 1 row of seats, but would not work the same in a C-172 or larger as the CG range is so much wider. My "P" model 182 has a very wide CG range.
Rich Harrison
AA-1B N1632Romeo
C-182 N52992
Dog is my Co-Pilot
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bob.hodo(at)yahoo.com
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| Posted: Sun Oct 09, 2011 1:20 pm Post subject: Found this on the Internet |
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<andrew(at)entro.com> wrote:
So the question that needs to be asked. Will the AA5 perform in the same way?
Andrew Kuzyk
To get a similar result in MY cheetah, I trim full nose up, then grab the trim wheel as far aft as I can and back off (trim nose down) as far as I can without taking my hand off the wheel. (On the 172 it was full nose up as previously stated in this thread.) Even then I may adjust a little up or down from there.
One of the biggest advantages to landing clean (zero flaps) is that our planes (at least the four place) if flown strait and level in this trim are cruising along with the mains much lower than the nose, which is exactly how you want to touch down. And it is a very stable condition, allowing you to descend by simply reducing power or level off by adding some.
If you are flying level at 70 knots clean your nose is up. If you are flying level at 70 knots with full flaps, your nose is pushed way down. Full flaps require a pilot with skills. Zero flaps allow a novice to make all necessary adjustments with left and right inputs to stay on the center line, and throttle adjustments to control descent rate. The plane will land itself.
Our planes are known for their responsiveness to control inputs. So you will have to find your own sweet spot.
Bob Hodo
GADsden, AL
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