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.
Received on Mon Jun 04 2007 - 08:28:30 CEST
This archive was generated by Yannick on Sat Dec 14 2019 - 19:13:45 CET