Re: Propeller rubber combination

From: Bill Gowen <b.gowen_at_earthlink.net>
Date: Sun, 25 Feb 2007 20:38:45 -0500

My only comment is that 1/16" is too small for the motor. The right size depends on a lot of things but I always start thicker than most people and work down from there. My guess is that something around .075 would work but others with more experience flying in high sites might disagree. If you run out of turns in the air and land dead stick you will probably have a better flight than if you land with several hundred turns left in the motor. I'd start with a prop pitch of around 10 (tip angle of 23 degrees) and adjust according to the results.

For a 20' gym use a quarter motor and you should be right on target in the 80' site.

  ----- Original Message -----
  From: Samiur Rahman
  To: Indoor_Construction_at_yahoogroups.com
  Sent: Sunday, February 25, 2007 7:29 PM
  Subject: [Indoor_Construction] Propeller rubber combination


  Hey guys,

  We have a good plane built that did 2:00 in our regional site of 25ft for
  Division C Wright Stuff. However, we are gonna be flying at a 80ft gym in
  states, and I want to get an idea of what is the general prop/rubber
  combination for such high sites. I was thinking low pitch and thin rubber,
  but what would be a good point to start? 1.2 P/D and 1/16 rubber? Please
  give me the angle for the P/D ratio too, because I confuse the ratios and
  angles a lot. Any help would be appreciated.

  We are also practice flying at a 20ft gym at our school, should we use
  partial motors to try to get it to climb up high?

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Received on Sun Feb 25 2007 - 17:38:51 CET