I am looking for advise on what to try next to extend the flight time of a
No-Cal in a 17.5' site with a very cluttered ceiling. Based on earlier
suggestions, I recorded the following test data & plotted in on Fred Rash's program
PRub50.exe
Following is the test data, all using 3/02 rubber:
14.75" long, .80 Gram, 1900 winds in/350 out, 181 sec.
16" long, .85 Gram, 2250 in/500 out, 199 sec.
17" long, .93 Gram, 2425 in/490 out, 203 sec.
Notes: The first two tests are based on a 9" pitch/7" diameter prop.
The third test is based on a 9.5" pitch/7" diameter prop.
These tests are essentially no touch results.
The launch torque was approx. 0.08 oz-in on my Wilder winder torque meter
which closely matches Fred's program. Also, graphing this data on Fred's program
indicates that I am using the flattest portion of the rubber's energy
curve.
One way to extend the flight time would be to use rubber with a "longer"
flat portion of the energy curve, but I am not sure what batch that would be.
Any suggestions?
I would be interested in your thoughts concerning using thicker rubber vs.
the added length & weight that would be required to get the number of useable
turns out of the motor. What other tests would you suggest?
Thanks,
Gary
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Received on Wed Jan 21 2009 - 15:08:22 CET