There was no rubber weight limit on 65cm F1D. The 1.4 ratio is about
what worked out in reality for maximizing flight time. Mathematically
you can show 2:1 is optimal rubber to weight for max duration but when
you plot that curve you will see the performance gain from ~1.4 to 2.0
ratios was if I recall less than 5%. 1:1 ratio was around 92% of max
potential. So a person running 1:1 and a guy running 1.2 ratio may get
similar times and if one has a slightly better trim setup or prop setup
they can get more time with less ratio. Some events seem to perform
better with light ratios and my guess is that it is becasue they are
launched will minimal backoff turns. So you are using the high torque
energy under the curve where a higher rubber to weight ratio may require
more backoff to keep the model from folding so the net energy used is
about the same.
Don
Received on Sun Oct 27 2013 - 09:18:31 CET
This archive was generated by Yannick on Sat Dec 14 2019 - 19:13:48 CET