P40 Propeller gyro effects (unusual forces noticed) - now an investigation into propeller-induced wobble phenomena

[unreasonable]

It should be easy enough to test in RL - not with a plane, but with a freely rotating toy prop on a stick which has no tail/fuselage to complicate matters. Hold stick into wind tilted up at at angle.  It should be obvious if the stick is being pulled up/down, sideways or both.

 

I think Moach should do this. 

[BlitzPig_EL]

To be fair, your toy prop should be powered by a motor, and not driven by the wind, but I see what you are getting at.

[Holtzauge]

Some more info on prop effects from Darrel Stinton's excellent book The design of the airplane. This book has tons of information on aerodynamics and flight mechanics and does a very good job of presenting it all in an understandable way. Highly recommened.

 

[unreasonable]

To be fair, your toy prop should be powered by a motor, and not driven by the wind, but I see what you are getting at.

 

Nope. Both aircraft props and windmill blades produce lift force - if they are pitched relative to the airflow the lift force will be asymmetric in both cases. Surely someone has a toy shop nearby with propellors/windmills on a stick?

[Holtzauge]

I feel a subtle disturbance in the force.......Could it be that this experiment has already been performed in Bangkok recently?......

[unreasonable]

No, I am not the sneaky type, to lay ambushes.     Perhaps if it was our departed comrade I would make an exception.

 

Just trying to think through the basics. Unfortunately my recollection of physics is no-where near good enough to actually calculate any of forces we have been discussing, if I even knew how to do it in the first place. I am also not much of a handyman, so the fun Youtube videos on making your own wind turbine are not going to get turned into physical product by me, unfortunately.

 

Next time I am at the department store I will have a look in the toy department (Oh all right, I always do...) Unfortunately something as simple, cheap and fun as a propeller on a stick probably does not have the high margin required anymore. 

[19//Moach]

well - seems we're not the first ones to get into this same discussion:  http://www.homebuiltairplanes.com/forums/showthread.php?t=24265

 

 

just a curiosity - still reading to see how it ends...