Today's Message Index:
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1. 06:06 AM - A-65 exhausts (Oscar Zuniga)
2. 04:58 PM - Some aerodynamic stuff (Isablcorky@aol.com)
3. 08:32 PM - Re: Some aerodynamic stuff (Mark Blackwell)
Message 1
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--> Pietenpol-List message posted by: "Oscar Zuniga" <taildrags@hotmail.com>
Anybody have a set of left and right exhaust stacks for a Continental
A-65/Aeronca 7AC for sale? It turns out that both the right and left stacks
on 41CC got bent in the nose-over and I'll probably replace both. Repairs
coming along nicely...
Oscar Zuniga
San Antonio, TX
mailto: taildrags@hotmail.com
website at http://www.flysquirrel.net
Message 2
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| Subject: | Some aerodynamic stuff |
Pieters,
As I build my engine mount jig some little questions have popped into this
ole brain. I remember from a long time ago, maybe flight school or somewhere,
that the downthrust angle on the engine is to force a more direct blast on the
lower surface of the wing.(High, single wing).
Now as I plan to extend the mount a full 2 inches forward of the plans and
lengthen the cabanes another 2 inches over the plans.
It would seem to me that it would be necessary to drop the engine incidence
to compensate for these changes.
Now those of you in the know please advise. I'm laying out the jig for a 4
degree downthrust measured from the firewall and a wing incidence of 1 degree
30'.
Sure would appreciate some help on this one. I promise to leave the list
alone for the future.
Corky in La nursing Isabelle with a strep throat
Message 3
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| Subject: | Re: Some aerodynamic stuff |
--> Pietenpol-List message posted by: Mark Blackwell <aerialphotos@dp.net>
What you are referring to is called P factor. With airplane at cruise
attitude both blades generate about the same thrust, but with a higher
angle of attack the downward blade gets a bigger bite of air than the
upward blade and thus creates more thrust. For most airplanes that
means the airplane wants to turn left and one of the reasons you need
right rudder on take off.
Moving the engine from the design point would definately change the
impact of this on the airplane, but how much and how you compensate for
it is beyond my knowledge base
Mark
Isablcorky@aol.com wrote:
> Pieters,
>
> As I build my engine mount jig some little questions have popped into
> this ole brain. I remember from a long time ago, maybe flight school
> or somewhere, that the downthrust angle on the engine is to force a
> more direct blast on the lower surface of the wing.(High, single wing).
> Now as I plan to extend the mount a full 2 inches forward of the plans
> and lengthen the cabanes another 2 inches over the plans.
> It would seem to me that it would be necessary to drop the engine
> incidence to compensate for these changes.
> Now those of you in the know please advise. I'm laying out the jig for
> a 4 degree downthrust measured from the firewall and a wing incidence
> of 1 degree 30'.
> Sure would appreciate some help on this one. I promise to leave the
> list alone for the future.
> Corky in La nursing Isabelle with a strep throat
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