Re: torque on airplanes.

[brian whatcott <inet@INTELLISYS.NET>]

At 08:24 4/13/01 -0400, you wrote:
> > .... nobody is going to turn him loose
> > in a P-51.
>
> Just as a note,
> this happens frequently for the radio controlled airplanes that I fly. The
power
> to weight ratio for these planes is typically absurd compared to a full size
> plane (2 HP on a 5 pound plane).  Novice RC pilots who bring a plane  into
the
> air under full  power with low airspeed usually experience a "ground loop"
(half
> loop ,half roll, lots of pieces).
>
> Scott

> *****************************
> S.Goelzer
> Physics Teacher
> Coe - Brown Northwood Academy
> Northwood NH 03261
> 603-942-5531 ext43
> sgoelzer@coebrownacademy.com
> *****************************

Here's some model data that may interest you.
 (I am continually amazed how rich the web resource now is:
I tried "thrust versus airspeed" on Google for instance.)

 The folks at Gainesville Aero Eng dept wanted to gather thrust versus
airspeed data for their MAV, using a few small commercial model engines.
  They all showed the very characteristic falling thrust with airspeed
that affects prop airplanes.
<http://www.aero.ufl.edu/~issmo/mav/MSU/MSU.htm>

It's a little surprising at first sight that the engine thrust is
maximal at zero airspeed. But this is deceiving.
 A model airplane prop has such high solidity that it never works at
truly zero airspeed.


brian whatcott <inet@intellisys.net>  Altus OK
                Eureka!