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Does anyone know how to tie a knot on a lubed motor broken strand that won’t slip. I think Don Deloach had and illustration of one once, but I have lost it.
Thanks,
Ed
Hello Ed,
For more than 20 years, this is the simplest and best knot I ever used. Never pulls, Rarely breaks.
“Make a single half reef and bind the free ends tight with crochet cotton wrapped 5 or 6 times before knotting and trimming.”
Practice doing a dozen or so in your armchair and you’ll see how easy it gets. Use your teeth to hold one free end of the crochet cotton and the knot is loads better with lubed rubber.
You will note, when stretched the rubber binds on the half reef knot, not the crochet cotton.
Taken from my Essay on “Preparing Rubber Motors” to be found at this link:
http://www.vintagemodelairplane.com/pages/TipsAndTricks/RubberPrep01.html
The rest of the essay deals with all the other factors involved in the title.
You can see at least eight of the knots described poking neatly out from the corded motor in this image. They never interfere with the cording and always appear outside the main bulk of the motor when fully wound.
The one I saw that worked was where you make an open loop with both strands, then wrap the end three times around, just below the loop. Then put the ends through the loop and pull tight. An overhand knot on top keeps everything from slipping. I’ve also used this for tying monofilament towlines.
Bill, Craig H. sent me an illustration from the Pensacola newsletter of the knot you are describing. It works great, no slipping and very easy to tie.
Link to illustration is
http://tpbweb.com/media/catalog/592.pdf
EdSeeing that old motor Ramon, never fails to bring a chuckle.
It is a fine example of preserving rubber though, and showing that one an often salvage larger motors.
The know by Mr Deloach looks like it is the business, will have to try it nect time I get a chance.
As far as knots ussually I just go with the good old granny knot(square knot or is it just a reef? Sorry I am unsure), then it is safetied, basically I just re tie the knot with the remaining ends two or three times after that it aint going nowhere.
Ive done it to lubed motors as well and never had a problem myself, but I am not a competetion flyer, those who are would be best served learning the knot shown by Don in the PDF, and then you never have to worry
Thanks for the smile Mr Alban, hope all is well with you.
-Grais.Hello Grais,
Not too bad, and thanks for asking. The only bad thing going on is this damned inability to walk more than 40 yards. Knocked my aeromodelling on the head PDQ so, I’m an internet junkie for the interim.
Just keep writing more and more every day, to get the hobby lifestory on record. Knee surgeon says not too long to wait now. Then they gorra do the other one, then they gorra find why the spinal cord is messed up.
But hey! Worse things happen at sea.
I still say my knot is so good it never fails. Learned from two legends. Peter Michel, premier UK vintage flier of singular ability and Phil Ball the foremost current BMFA competitor in virtually all FF classes, especially Rubber.
As for raising a smile, did you ever read this?
http://www.vintagemodelairplane.com/pages/Downloads/CRB_Tasters/RaraAvis01.html
Most normal folks simply would not believe what the Crazy Rubber Band do in their spare time!
For more rivetting adventures, browse the website.
Quite entertaining, wish I could fly with you guys.
You have a real gift Ramon, you describe the whole process of winding a 8 oz wake motor to a T, well I can only imagine actually, as I have yet to fly an 8oz Wake at full chat as it were, but I am sure it is just as you describe. And you always manage to inject a subtle undertone of humor, on top of a not so subtle undertone of seriousness of subject.
Its quite the trickery indeed, and most enjoyable reading.
Thanks again,
-G.@Ed Hardin wrote:
… no slipping…
I don’t know how it’s NOT slipping on your motors. My, lubricated with silicon oil, the knots are SLIPPING. 🙁
I find a simple double overhand of an eight knot works well. Wipe off as much lube as possible tie the knot pull it down then add the smallest amount of CA on the back side of the knot and pull down again. If the right amount of CA was applied the knot will stay small and not pull out.
I reciently mad up some 13 strand motors with a loop at each end. I usually break in my motors on my rubber tester where the motor is streached to 5600 psi. With regular motor sometimes the knot let go. With the odd strand motors none ever came loose even when not sealed with CA. I assume ther is less stress on a loop to one strand than on a regular knot where the full force is on the knot.
Carrol
Consider, if you will that when you make a loop, and the pull on the loop, the load on the single strand is split at the juncture with half the load of the single strand going into each branch of the loop.
Thus if the single strand carries , say, 10 pounds, then each side of the loop will carry 5 pounds.
Does this make sense?
Cheers!Here is a simple knot that holds well with lube. In fact it needs lube to pull down properly. The keeper knots are figure eights. I hope the picture is self explanatory.
Carrol
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