RE: Re: flying like Bill Gowen

From: hermann andresen <hermanna_at_hotmail.com>
Date: Sun, 12 Aug 2012 08:08:56 +0000

Agreed, there is significant upthrust in most models relative to the flight path. If you think about it this translates to higher pitch in the blade on the right and lower in the left blade. Because of the tight left turn this helps match the angle of attack on both sides, a good thing.
Similarly the left thrust means more pitch (more thrust) in the top blade than the bottom, providing the effect of down thrust.Probably also a good thing.
Perhaps even better would be single blade, which would be better matched thru entire revolution and whether larger dia or chord should be more efficient,but that's a different discussion.
H
To: Indoor_Construction_at_yahoogroups.com
From: f1diddler_at_yahoo.com
Date: Sun, 12 Aug 2012 02:36:42 +0000
Subject: [Indoor_Construction] Re: flying like Bill Gowen
















 



  


    
      
      
      



--- In Indoor_Construction_at_yahoogroups.com, William Gowen <wdgowen_at_..wrote>> Mark has pointed out several times that I'm flying with downthrust compared to what others do. I don't agree. In my way of thinking *they* are flying with upthrust compared to the model's direction of flight>>



Not claiming this is absolute downthrust, but rather is more downthrust relative to trimming decalage via up (negative incidence) stab, assuming (per Hunt/Gowen trim) you start with prop shaft parallel with motorstick. I'm not even able to fathom what absolute downthrust means, except that it's relative to everything else. And then there's motorstick bend at launch to add.



<<It may all be BS but the

results have been pretty good.>>



Agree on both points there! :^))





    
     

    
    






                                                 
Received on Sun Aug 12 2012 - 01:08:57 CEST