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would a full feathering propeller help?

 
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elmar.hegenauer(at)telus.
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PostPosted: Sun May 04, 2008 8:51 pm    Post subject: would a full feathering propeller help? Reply with quote

I've read all the postings regarding
the GLIDING RANGE, thank you very much
everybody.
Now here comes my question: Would a
full feathering propeller improve the
engine off landings characteristics of
a Nanchang or a YAK?

cheers

Elmar
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brian-1927(at)lloyd.com
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PostPosted: Sun May 04, 2008 9:09 pm    Post subject: would a full feathering propeller help? Reply with quote

On May 4, 2008, at 9:48 PM, Elmar Hegenauer wrote:

Quote:

>
I've read all the postings regarding
the GLIDING RANGE, thank you very much
everybody.
Now here comes my question: Would a
full feathering propeller improve the
engine off landings characteristics of
a Nanchang or a YAK?

Landing characteristic or gliding characteristic? It would certainly
help with glide after an engine failure. However, I am not sure if I
would want to feather the prop for a normal landing.

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Brian Lloyd 3191 Western Drive
brian HYPHEN 1927 AT lloyd DOT com Cameron Park, CA 95682
+1.916.367.2131 (voice) +1.270.912.0788 (fax)

I fly because it releases my mind from the tyranny of petty things . . .
— Antoine de Saint-Exupéry

PGP key ID: 12095C52A32A1B6C
PGP key fingerprint: 3B1D BA11 4913 3254 B6E0 CC09 1209 5C52 A32A 1B6C


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brian-1927(at)lloyd.com
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PostPosted: Mon May 05, 2008 8:53 am    Post subject: would a full feathering propeller help? Reply with quote

On May 4, 2008, at 9:48 PM, Elmar Hegenauer wrote:

Quote:

>
I've read all the postings regarding
the GLIDING RANGE, thank you very much
everybody.
Now here comes my question: Would a
full feathering propeller improve the
engine off landings characteristics of
a Nanchang or a YAK?

Many of the Harmon Rocket aircraft flying out there have full
feathering props. The reason is that someone just pulled the engine
and prop off of an Aztec and used it.

Brian Lloyd 3191 Western Drive
brianl AT lloyd DOT com Cameron Park, CA 95682
+1.916.367.2131 (voice) +1.270.912.0788 (fax)

PGP key ID: 12095C52A32A1B6C
PGP key fingerprint: 3B1D BA11 4913 3254 B6E0 CC09 1209 5C52 A32A 1B6C


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ChangDriver



Joined: 15 Sep 2007
Posts: 266

PostPosted: Mon May 05, 2008 7:00 pm    Post subject: Re: would a full feathering propeller help? Reply with quote

IF the prop will feather, it will produce less drag and should increase glide. However, depending on the failure, the prop may not feather or the prop may not be windmilling.

In addition, I teach students to pitch up when I simulate an engine failure. You can translate the forward speed above best glide into altitude. An with no engine, altitude is your friend. Most students will start looking for a place to land and just maintain their altitude and bleed off the speed. You may only get 100 feet or so, but it is more than you had before and is a good use of the energy.

For what it is worth,

Craig


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