[NSRCA-discussion] Down Thrust vs Wing

[Nat Penton]

Very good Jim. "We" keep making progress.               Nat
  ----- Original Message ----- 
  From: J N Hiller 
  To: NSRCA Mailing List 
  Sent: Sunday, March 16, 2008 6:25 PM
  Subject: Re: [NSRCA-discussion] Down Thrust vs Wing


  In the field I just pulled the spinner cone and hold the Robart head against the spinner back plate. The side of the measuring head is quite square to the bar and the prop can be left on.

  Jim Hiller

   

  -----Original Message-----
  From: nsrca-discussion-bounces at lists.nsrca.org [mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of Nat Penton
  Sent: Sunday, March 16, 2008 4:10 PM
  To: NSRCA Mailing List
  Subject: [NSRCA-discussion] Down Thrust vs Wing

   

  Keith

  An easy way to measure thrust line relative to wing is to bend an L shaped piece  out of aluminum strap to attach to the motor. The plane does not need to be level to measure. Use a Sullivan and/or a Robart meter to measure the wing incidence, then "sit" on top of the prop bracket and measure the down thrust.

   

  The horizontal leg on the prop bracket only needs to be 4 to 6" long for the meter to sit on. The meter can be held in place with a rubber band if needed.

   

  Brilliant ! LOL                                  Nat



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