I started flying outdoor FF, F1B, a couple of years ago. The first
thing I learned is that to be successful one must test EVERY motor
before winding and flying it. The test I use was developed by Bob
Piserchio and requires that the motor (30 grams lubricated) be
stretched to 80 pounds of tension. The length is then recorded. The
motor is left at that length for a minute and the tension at that
time is recorded. Then the motor is relaxed to 40 pounds of tension
and that length is recorded. and finally, the motor is relaxed to a
length of 92" and the tension is recorded.
The important numbers are the 80# length and the 92" tension. The
first give a very good guide with respect to the number of turns the
motor should take. The second is an indication of the torque
available during the cruise portion of the motor run and is used to
rank motors.
Getting every possible turn into an F1B motor is necessary for good
results, especially for early morning, extended max rounds. Because
of hysterisis, It's also necessary to put additional winds into a
motor while waiting for a thermal. This is an exercise in
brinksmanship as one too many turns results in a broken motor in the
motor tube and not putting the turns in can result in a very wimpy
motor fter standing on the line for 15 - 20 minutes.
Even though outdoor flyers have thermals, winding and testing are
critical skills to develop.
Tom
Received on Fri Oct 31 2008 - 15:24:18 CET
This archive was generated by Yannick on Sat Dec 14 2019 - 19:13:45 CET