Re: RE: RE: RE: Effective AOA on prop blades?

From: Tapio Linkosalo <tapio.linkosalo_at_iki.fi>
Date: Tue, 01 Oct 2013 18:37:00 +0300

On 01-Oct-13 17:36, ykleetx_at_gmail.com wrote:
>
> But what if the nose is up by two degrees ;-) ?
>
> ....
>
> and doesn't the prop on the outside of the circle see a lower AoA
> (when the nose is flat)?
>
>
It does have an effect, of course. But then, the prop disk also
accelerates the flow that runs through it, already in front of the
plane, so the inflow speed and direction is not similar to flight path
and speed of the model. Probably the accelerating inflow turns in the
direction of prop disk tilt (relative to the model flight path). And
this phenomenon also affects the effective AoA of blades... :-)

There is a nice paragraph of prop issues in Model Aircraft
Aerodynamics... (by Martin Simons)




-Tapio-
Received on Tue Oct 01 2013 - 08:37:06 CEST