Re: VP adjustments at USIC

From: Fred or Judy Rash <frash_at_chartertn.net>
Date: Mon, 4 Jun 2007 14:29:19 -0400

That is great, Bill. So far as I know, no one else has done 20 minutes in F1M in the Mini-Dome. I found a reference to a19:39 by Bernard Hunt in 1999 and several other folks may have been close. I did not have recent records, but you may still have all USIC F1M scores on your spreadsheet.

I did not try F1M this year since it was so bad last year and even considered converting it to Electric FF Duration. An old Science Olympiad Wright Stuff plane was converted instead. It was too small and heavy and did not fly very long.

Fred Rash

  ----- Original Message -----
  From: Bill Gowen
  To: Indoor_Construction_at_yahoogroups.com
  Sent: Monday, June 04, 2007 11:27 AM
  Subject: [Indoor_Construction] VP adjustments at USIC


  After reading about John Kagan's on-site modifications to his F1D VP
  I realized that I had gone through almost exactly the same process
  with my F1M on Sunday. I started out flying slightly short 1/2 motors
  and hung my F1M on the ceiling about 60' up on my first flight. I
  cranked in more high pitch and less preload, moved out to a higher
  part of the dome and put my second half motor flight up about 70 or
  80 feet. With maximum high pitch and minimum preload the third flight
  was about the same. My half motor goal was 55' so this was clearly
  not acceptable.

  This left me with the options of backing off turns or doing surgery
  on the VP. Since all my motors would only take the turns required for
  my target flight time, I figured a hub modification was the only good
  choice.

  I backed the high pitch screw all the way out and then carved some
  more clearance into the screw block. Then I took the preload screw
  completely out so the end of the preload spring could go into the
  hole where the screw had been.

  This finally slowed the climb down enough so the model would top out
  at 110 to 115' at full winds on a 15 1/2" 3 strand motor. After the
  contest was over I measured the high pitch at 54 - much more than I
  would ever have thought was needed.

  The last flight of the day was 20:00. Next stop might be a record
  attempt at Lakehurst.



   

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Received on Mon Jun 04 2007 - 11:32:01 CEST