Throt/ Rud

[ray ayestaran]

When I put in even more right engine thrust angle on my big bird now I get 4 flights on peak rather than 3. before I was leaning on the rudder much more and had some right rudder trim all the time which was gobbling my batts.

both methods seem to work well to correct this problem, in my experience everytime I try a mix or trim condition it seems to negatively effect something else. I would like modelers to comment and compare any negative effects these two trim methods create?
  ----- Original Message ----- 
  From: spbyrum 
  To: discussion at nsrca.org 
  Sent: Thursday, January 27, 2005 7:36 AM
  Subject: RE: Throt/ Rud


  The question becomes how small a diameter prop and how slow must you go for this situation to kick in.  SPA doesn't fly rockets like the old days.  Noise is a bad thing.  4 strokes with larger props slow us down, too.

   

  Steve Byrum 

  -----Original Message-----
  From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org] On Behalf Of John Pavlick
  Sent: Wednesday, January 26, 2005 11:48 PM
  To: discussion at nsrca.org
  Subject: RE: Throt/ Rud

   

  Ed,

   Sure, but you can only fly planes like that in SPA!!! (Or Sportsman). My Super Kaos Jr. is set 0-0-0. Just a little bit of right rudder and up elev. trim - still tracks down lines straight. I don't mix anything with the radio - it's all done the old fashioned way! 

  John Pavlick
  http://www.idseng.com
    

    -----Original Message-----
    From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org]On Behalf Of Ed Hartley
    Sent: Wednesday, January 26, 2005 10:35 PM
    To: discussion at nsrca.org
    Subject: Re: Throt/ Rud

    Think about having the trim and thrust where you don't have to do either?????

    Ed

     

      ----- Original Message ----- 

      From: John Pavlick 

      To: discussion at nsrca.org 

      Sent: Wednesday, January 26, 2005 10:13 PM

      Subject: RE: Throt/ Rud

       

      Ed,

       Don't think about inverted / upright / right / left like that. It's all the same to the airplane. Upright the slip stream hits the left side of the fin causing Left yaw. For sake of argument: Right thrust will be used to counteract this. Inverted, the SAME THING happens. Don't think right / left in reference to YOU, think left / right in reference to the AIRPLANE. When inverted the slip stream hits the left side (still) of the fin - unless the motor suddenly starts turning the opposite way. Same thrust offset ("Right") required unless the slip stream goes away in a push. Now if there's right thrust, you need left rudder to offset the right thrust which is trying to make the airplane yaw right in the absence of the slip stream air on the fin. If you still want to think about it the "other" way, remember "left" rudder when inverted will make the plane yaw to the "right" (in reference to YOU standing there watching the plane). Now I'm getting confused.

       If you think about what Chip described: Trim for straight flight at full throttle, mix left at idle. Another way would be trim straight at idle, mix right at full throttle. That's what I've been doing. Same difference. 

      John Pavlick
      http://www.idseng.com
        
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