I maybe misunderstood this technique when it was first described, but I do it a little bit different. There is a possible disadvantage in that the rubber is subjected to more stress.
Lube the untied strip and put 2 o-rings on.
Cut the strip to the exact weight that you're looking for.
Tie one overhand knot as close to end as possible and pull tight.
Move this knot as close to the end of the motor as you dare by pulling the strands apart inside of the knot.
Tie a second overhand knot inside of the first one and pull fairly tight.
Pull the second knot into the first one.
I don't reverse the second knot and my knots don't come loose. I don't fly F1D so can't say how well this would work for F1D motors that are stressed to 99.9% of maximum.
----- Original Message -----
From: Fred Tellier
To: Indoor_Construction_at_yahoogroups.com
Sent: Friday, April 27, 2007 1:52 PM
Subject: Re: [Indoor_Construction] Making motors to weight...
Its called the double overhand knot, the advantage is that you can adjust the weight by tying a second knot and cutting off the old one, in fact you can tie only 1/2 knot if only a little over. The trick is reversing the direction of the knots so they lock together, the motor can be tied with lube applied and no CA is needed on the knot.
Check this link
http://cloudbustermac.tripod.com/knot-page.htm
Fred Tellier
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Received on Fri Apr 27 2007 - 12:23:12 CEST