Leo described the rubber unwinding test in a previous post:
As Jake says, Fred Rash's torque vs. wind chart are just an estimates. The charts depend on data fits, interpolations, and the winder's technique. It is easy to create your own chart for the motors you use. For F1D, I suspect the motors used by a flier are all about the same length (of course, they are the same weight). So one needs only to make one, or perhaps just a few charts. The charts are easy to make. Just do a full torque wind just has you would do when flying in completion where you are one second beyond for the last flight of the event. In other words, winds as tight as you can. Then, write down the torques as you slowly unwind, perhaps every te winds at the beginning and end but just every 50 when the torque look flat. Fred Tellier took 11 measurements but I take about 50 in total. I also do not touch the motor as I unwind. Others tap the motor they say to settle the torque readings. When I make these charts to test rubber, I repeat for at least 6 motors (broken motors do not count. And I repeat a second time for each test motor two or more weeks later after the motors are well rested from the first wind.
If you make your own charts, you will know what output you get for your own winding and rubber.
---In Indoor_Construction_at_yahoogroups.com, <phedon21t_at_...> wrote:
You are taking torque measurements at what stretch ratio? What are you reading and where?
You must be more specific about your method.
Give us some real precise measurements. Ciao, Phedon.
Sent from my iPhone
On Nov 13, 2013, at 5:46 PM, <ykleetx_at_... mailto:ykleetx@...> wrote:
> wrote:
Received on Thu Nov 14 2013 - 13:24:15 CET