I don't know many flyers who use rubber O rings they are way to heavy. Pneumatic tubing is available in many wall thickness and diameters, these are easy to make and I have never damaged a motor with them.
Fred Tellier
----- Original Message -----
From: dgbj_at_aol.com
To: Indoor_Construction_at_yahoogroups.com
Sent: Wednesday, March 28, 2007 5:45 PM
Subject: Re: [Indoor_Construction] O-ring question
Marty,
I had another idea for making the O-ring removable. Fold the O-ring around
the motor and put the two loops of the O-ring over the hook. I tried this
with some of the O-rings I have and they were too stout to fold. I could place
the O-ring on the far side of the hook and loop the loose motor through the
back of the O-ring and around the wire, but this is not going to work with a
wound motor, it is more difficult than attaching the wound motor without an
O-ring. It might work with longer, thinner O-rings. I don't have any to try,
you might be able to find some if you want to try this idea.
Alternatively, a ring might be fabricated from steel wire in the same shape
as a folded O-ring. It might be possible to use a loop of braided fishing
line for this.
My large O-rings weigh 0.043 grams each and the small ones weigh 0.0105
each. Someone suggested the weight of the O-ring was not important. This poses
a question that may be answered. Reducing the 0.6 gram motor weight by the
0.0105 gram O-ring weight reduces the available energy by 1.75 percent. Is
that enough to be important in a contest? If you are flying in a 9 minute
site, that is 9.45 seconds. If you are less than 9.45 seconds behind first
place, it might be important.
Gary Hinze
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Received on Thu Mar 29 2007 - 03:19:11 CEST