Thierry
My quick way of finding the quality of the rubber is to make up a motor of a standard length and weight (I use a 1/3 F1D motor of 0.2 g weight). It does not matter if the length is slightly different from the standard length but the weight must be the same.
Stretch the motor about 7 times and wind it until it will not stretch any more. Do not come in towards the torque meter. Note the number of turns applied. Hold the motor fully stretched for about 1 minute. I use this method (Bernie Hunt's) to break in the motor.
Unwind 1/2 the number of turns while coming in to the unstretched length. Stretch and unstretch slightly to allow the knots to settle and measure the torque.
Multiply the torque and turns numbers together to give you a measure of the energy stored in the rubber. The bigger this number, the better the rubber for flying. Use this method to compare with rubber that you know. You will soon know if the rubber is bad!
I believe that Jim Richmond used this method or something very similar to give an 'Index of Performance'.
Happy New Year! Bob
----- Original Message -----
From: thierry.marilier
To: Indoor_Construction_at_yahoogroups.com
Sent: Saturday, December 26, 2009 7:06 PM
Subject: [Indoor_Construction] new ssp rubber
we have received the new oct 2009 super sport rubber batch, to use it at the training meetings of the junior team.
We desire have a test of the rubber whitout make a testing flight. What is the best process ?
Received on Mon Dec 28 2009 - 02:30:31 CET
This archive was generated by Yannick on Sat Dec 14 2019 - 19:13:45 CET