Wright Stuff B

[jander14indoor]

Good ES will not touch or disassemble your plane. Unless you ask for help, then maybe.
Good ES will have one of a couple of methods of weight.
Electronic balance with a pre-tared stooge. It will have a clip of some sort to hold your plane by the motor stick.
Balance with hook and counterweight set to minimum weight. My preferred method, very quick, doesn't require power and I don't care what your plane weighs (you should) as long as it overbalances the counterweight. Know where you can hook your plane, typically behind the prop hook, not on the prop, it will spin and drop the plane or behind the wing posts. I use two, one for the plane, one for the rubber. And it avoids the problem that some electronic scales are sensitive to static on the rubber.

Not so good solutions.
Electronic scale with no stooge. Bring your own in case
3 or 4 beam balance with a small stage. Really doesn't work well and fortunately I haven't seen one in a while.

Jeff Anderson
Livonia, MI

[freed2003]

Does anyone know how many winds you can get with a fai tan 3/32 rubber? When I tried 1200 I think the know un winded itself so how could I fix that(I tied it the way they said in the freedom flight manual)

[bernard]

Does anyone know how many winds you can get with a fai tan 3/32 rubber? When I tried 1200 I think the know un winded itself so how could I fix that(I tied it the way they said in the freedom flight manual)

When I was competing I could get 1470 winds in a 0.094" 2.00 g motor (approximately 1100 winds on a 1.50 g motor of same width). My mentor could get 1730 winds on the same motor (approximately 1300 winds on a 1.50 g motor). Jeff Anderson posted instructions for tying motors: viewtopic.php?f=245&t=9271&p=308340#p308365.

[bjt4888]

freed2003,

Using the John Barker maximum turns equation, breaking turns for a 11" loop of .094" rubber would be about 1,439. You didn't mention loop length, but 11" would be about right for average density tan ss rubber (.083 g/in) and this is assuming that you are using two black rubber o-rings (.04 grams each).

Winding to about 90% of breaking turns and then backing off to launch torque needed to stay clear of the ceiling would be a pretty good strategy.

Brian T.

[freed2003]

freed2003,

Using the John Barker maximum turns equation, breaking turns for a 11" loop of .094" rubber would be about 1,439. You didn't mention loop length, but 11" would be about right for average density tan ss rubber (.083 g/in) and this is assuming that you are using two black rubber o-rings (.04 grams each).

Winding to about 90% of breaking turns and then backing off to launch torque needed to stay clear of the ceiling would be a pretty good strategy.

Brian T.

Sorry, but what do you mean by "backing off", do you mean to unwind or wind until I get the the torque needed to stay clear of the ceiling?

[bernard]

freed2003,

Using the John Barker maximum turns equation, breaking turns for a 11" loop of .094" rubber would be about 1,439. You didn't mention loop length, but 11" would be about right for average density tan ss rubber (.083 g/in) and this is assuming that you are using two black rubber o-rings (.04 grams each).

Winding to about 90% of breaking turns and then backing off to launch torque needed to stay clear of the ceiling would be a pretty good strategy.

Brian T.

Sorry, but what do you mean by "backing off", do you mean to unwind or wind until I get the the torque needed to stay clear of the ceiling?

Yes, he means winding up to 90% of maximum winds (breakage) and then unwinding to your desired launch torque. This takes advantage of hysteresis (loss of energy) to have more winds. See viewtopic.php?f=191&t=6587&p=270417#p270417.

[freed2003]

How does the sli-slick lube fai tan sells compare to armor all or son of a gun?

[jander14indoor]

Probably better, it was formulated for rubber, but not in any earth shattering way. It might gain a few seconds, might, on a 2:30 flight. Certainly it won't harm the rubber.

Jeff Anderson
Livonia, MI

[freed2003]

Thanks for the response.
Do you guys think 1/16 rubber is a must have or can I go by on just 3/32?

[JasperKota]

It depends on the plane. If you notice that you still have many winds left after your plane lands, it's unnecessary to go thinner, in fact you may want to go thicker. If your plane is optimally trimmed and it runs out of winds before it lands, you may want to switch to thinner rubber. Different rubber widths are good to experiment with, though, so I suggest getting ahold of a few different widths.