Design: Dihedral Recommendation

[Ed Miller]

The Hanson 26% Dalotel makes a great Pattern/Imac dual purpose plane that easily comes in under 11lbs. Mine has  ST2300 and is both fun and competitive. Ed M.
  ----- Original Message ----- 
  From: Ted Sander 
  To: Discussion at Nsrca. Org ; Rcmaster199 at aol.com 
  Sent: Sunday, May 11, 2003 3:16 PM
  Subject: RE: Design: Dihedral Recommendation


  Matt -

  Yep, my thoughts exactly - This project all came about because last summer a) I crashed my Calypso (yeah, "old fashioned", but a heck of a aerobatic plane), and b) out of how much I've learned to dislike my H9 ARF CAP.  That one I had to add 1 lb of dead batteries to the nose.  I'm making sure the new one will work out correctly!  Fine for a Sunday sport flyer, horrible for anything precision.  BTW - I'm using an FPE 2.4 gasser, which replaced the YS 1.20 it used to have.  After pipes, alum. hard mounts, etc. were removed and replaced - the all up weight was the same - 48 oz of stuff for each engine.  Doesn't count the ignition batteries..but I needed nose weight anyway!  That's why the hopes I can campaign with this as a dual purpose plane - Pattern and IMAC.  Should be able to hit the 11lbs, if I'm really, really careful.

   

  -----Original Message-----
  From: Rcmaster199 at aol.com [mailto:Rcmaster199 at aol.com]
  Sent: Sunday, May 11, 2003 10:52 AM
  To: tedsander at attbi.com
  Subject: Re: Design: Dihedral Recommendation

   

  In a message dated 5/10/2003 11:54:08 PM Eastern Daylight Time, tedsander at attbi.com writes:





  Subj:RE: Design: Dihedral Recommendation 
  Date:5/10/2003 11:54:08 PM Eastern Daylight Time
  From:tedsander at attbi.com
  Reply-to:discussion at nsrca.org
  To:discussion at nsrca.org
  Sent from the Internet 



  Thanks George - FYI, I'm anticipating ending up with about 3.5 degrees of
  right thrust.  I'll start with 3, and adjust from there.  Down will start at
  zero, and be set as flight testing dictates.  Gas engine, big prop (20x10).
  Vert. Stab/Rudder will be counterbalanced.  Planform isn't too far different
  than on a Focus.



  Ted,

  You want a small amount of downthrust if you want the model to track true vertical up lines. For this size model, about 11/2 to 2 degrees down is a good place to start. If the model is going to be used mostly as a fun flyer, different story. It matters alot less.

  Your right thrust is also about right for the large gassie

  One other consideration is wing placement. The gassie is heavier than alkies, so you should probably start with a foreward wing location, to keep the CG from needing too much tail weight, even if you are planning to use elevator servos in the tail. At least 1" further forward to start. If you do move the wing, then the down and right thrusts become more important. Think shorter moment

  Matt K

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