It's not hard to tie a lubed knot. Lube the rubber lightly pull the knot tight,
wash in soap solution while you are pulling it then let go and tight a second
knot against it if you like. After drying CA the short loose end and lube before
you use it, Ciao, Phedon
________________________________
From: Carl Bakay <carl.bakay_at_yahoo.com>
To: "Indoor_Construction_at_yahoogroups.com" <Indoor_Construction_at_yahoogroups.com>
Sent: Mon, February 28, 2011 11:11:06 AM
Subject: Re: [Indoor_Construction] Re: Rubber Motor O rings
I have done a lot of rubber testing thanks to Goldstein's prodding during my
INAV days, testing mostLy 7 inch loops of 1/8 strip, and without exception,
those that broke did so at the knot. These knots were un lubricated, due to the
difficulty of tying a lubed knot. The stye of the knot did not matter ... It
seemed that that was where all of the stress was located.
I wrapped my loops for stretch testing around a nail, over which was slid a
piece of Tygon fuel tubing. This also allowed the knot to move, in keeping with
current FAC technology for short rubber motors in multiple-engine planes.
Carl Bakay
Sent from my iPad
On Feb 28, 2011, at 12:46 PM, "dennisatyson" <ddtyson_at_peoplepc.com> wrote:
>Here is another source for 90A durometer o-rings at a great price.
>http://www.oringsandmore.com/servlet/StoreFront
>
>--- In Indoor_Construction_at_yahoogroups.com, Warthodson_at_... wrote:
>>
>>
>> From what I have read & experienced, o-rings cut from plastic tubing do not cut
>>into the rubber any more than the wire hooks. It seems counter intuitive, but
>>many very experienced indoor flyers use plastic tubing for o-rings. Personally,
>>I prefer the hard plastic o-ring to a rubber o-ring. I find them easier to hook
>>up. I read somewhere that someone boiled their plastic o-rings to remove the
>>sharp edges, but I have never met anyone that told me they actually do that. If
>>the sharp edge were cutting into the rubber I would expect most of my motors to
>>break at the o-ring, but again that has not been my experience.
>> Gary
>>
>>
>>
>>
>>
>>
>> -----Original Message-----
>> From: Terry <jantel98_at_...>
>> To: Indoor_Construction_at_yahoogroups.com
>> Sent: Mon, Feb 28, 2011 7:05 am
>> Subject: [Indoor_Construction] Rubber Motor O rings
>>
>>
>>
>>
>> What are people using for O rings ?, I have heard of rigid plastic being used,
>>if so do it not cut into and damage the rubber ?, I have just cut some thing
>>rings from a light plastic (Ear cleaner) tube and was looking for a way to
>>smooth them down a little
>>
>> Terry
>>
>
>
Received on Mon Feb 28 2011 - 13:02:48 CET