The problem with this idea is that o-rings used by competition indoor flyers are not the black rubber ones you can find in hardware stores.
Most are thin slices cut from very rigid nylon tubing and folding them would be pretty much impossible.
----- 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 Wed Mar 28 2007 - 21:32:22 CEST