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Author Topic: How strong are .012X52' lines?  (Read 1841 times)

Offline frank mccune

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How strong are .012X52' lines?
« on: August 01, 2014, 06:34:51 AM »
     Hi all:

     Would these lines be safe to use to fly .15 and .25 stunt planes?

     I am planning to use these on stunt trainers with the strongest on being a Brodak.25 powered Super Clown.  If I use the formula of pull test equals10 times the model's weight would .012 lines be strong enough?  If the lines survive this test, may I assume that it they are adequate?

     I had a flyaway with some old, perhaps kinked, .012 lines on a K&B 19 powered stunter and that was scary!  Since we fly near a busy freeway, I do not want to take any chances on another flyaway!

    Suggestions?

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Offline Keith Miller

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Re: How strong are .012X52' lines?
« Reply #1 on: August 01, 2014, 07:06:41 AM »
Yep, .012 are good for those size planes.
Regardless of the line size, weak points occur at kinks and at the ends, depending on how you service the end connectors.  There's many threads on how to make up your ends to reduce the risk of line breaks at the end. 
But the .012 line is surely ok.

Offline frank mccune

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Re: How strong are .012X52' lines?
« Reply #2 on: August 01, 2014, 07:28:26 AM »
     Hi Keith:

     Thanks for the reply.  The lines are n.i.b. Sig lines from yesteryear.



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Offline bob whitney

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Re: How strong are .012X52' lines?
« Reply #3 on: August 01, 2014, 07:57:09 AM »

 a Brodak 25 should be able to fly a super clown on .15 braided lines from 58 to 60 ft with no problem with a much bigger safety factor
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Offline George

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Re: How strong are .012X52' lines?
« Reply #4 on: August 01, 2014, 08:31:07 AM »
a Brodak 25 should be able to fly a super clown on .15 braided lines from 58 to 60 ft with no problem with a much bigger safety factor

Absolutely.

Frank, you may be spinning a bit fast for stunting with a .25 on 52' lines. Although you may be able to do it safely, IMHO you would probably be a lot more comfortable with the 60' x .015's.

George
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Offline Tim Wescott

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Re: How strong are .012X52' lines?
« Reply #5 on: August 01, 2014, 08:36:04 AM »
I fly an LA-25 powered Flight Streak on 60' lines with lap times somewhere in the 4.2 to 4.5 range (if I'm remembering correctly).  With 52' lines I think the grass would be at chest height by the time I landed.

.012 lines should be fine from a safety standpoint for the planes you describe, although your 25-powered plane may fly better on thicker lines because they'll be less springy.  If you read the CLPA rules from AMA they have a chart of airplane weight to line size, as well as pull-test guidelines.
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Offline Gene Martine

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Re: How strong are .012X52' lines?
« Reply #6 on: August 01, 2014, 09:09:17 AM »
Frank:
Hope this helps.
Gene
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Offline frank mccune

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Re: How strong are .012X52' lines?
« Reply #7 on: August 01, 2014, 10:51:04 AM »
     Hi All:

     Thanks for the replies.

     I did fly all of these planes on 60' fishing lines, 100lb. test and they seemed to be a bit "floppy" in the corners on that length.  With the 52', there is much more line pull that feels reassuring to me. Lol


     I will try the 60' lines again to see if I can adapt to less line pull.

    I think that the AMA Saftey Code states that a pull test of 10 times the weight of the model is a good test for saftey.  It seems to be a lot of pull!

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Offline Brett Buck

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Re: How strong are .012X52' lines?
« Reply #8 on: August 01, 2014, 12:06:32 PM »
     Hi All:

     Thanks for the replies.

     I did fly all of these planes on 60' fishing lines, 100lb. test and they seemed to be a bit "floppy" in the corners on that length.  With the 52', there is much more line pull that feels reassuring to me. Lol


     I will try the 60' lines again to see if I can adapt to less line pull.

    I think that the AMA Saftey Code states that a pull test of 10 times the weight of the model is a good test for saftey.  It seems to be a lot of pull!
     

  Making these sorts of changes (fishing line to .012 and 52 to 60) should required drastically different trim settings. It may be that it feels loose on 60's just because you don't have enough leadout sweep or tipweight or any number of other things.

   If we are talking about a Flite Streak with a 25, we know for certain that will work fine on .015x60 if everything else is right. I can't imagine flying it on 52's, it's got to be a bat out of hades and lap times are going to be very fast. A typical lap time on 60' is 4.6 seconds, 52 puts it around 4 flat.

    I wouldn't fly any of these sorts of airplanes on .012s, myself, but I can't say it isn't safe because a lot of people do. My Skyray has a mere 19 lb pull test, and it feels like nothing.

    Brett

   

Offline Paul Smith

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Re: How strong are .012X52' lines?
« Reply #9 on: August 01, 2014, 11:00:00 PM »
0.012"   25 pounds
1/64"    40
0.018"   55 
0.021"   80
0.024"  100
0.027"  125
1/32"    150

Copied from the McMaster Carr catalog.  So a pair of .012"'s with proper terminations should hold 50 pounds, assuming, of course that you never hang the plane on one line. 

Back in the early 80's we learned that a pair of .012" could not be trusted to restrain an F2D model with a healthy Cox or Rossi .15. That was for practice flying, not 2-up combat.

Paul Smith

Offline Dennis Moritz

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Re: How strong are .012X52' lines?
« Reply #10 on: August 02, 2014, 02:08:15 AM »
It's the kinks and the hidden fatigue points. For instance at the end of a wire wrap. That cause issues .012s kink much easier than .015s. Watch out for kinks and wear points. Also measure the diameter of your lines. I had a set of Sig .012s(?) that I used on a Junior Streak for a season or two. Worked great. One day the plane landed and a line broke at the wrapping stress point. What amazing luck. A friend said the lines looked kinda thin. Measuring them. .008.  Spider wire works. Less weight than stainless cable. As far as line length and power, it all depends. How much does the Streak weigh. How straight is it. Misalignment and warps suck power. Streaks need to fly decently fast. They get mushy when slowed down too much. They don't have to be flown at slow combat speed, but they need to move along. One of the best learning the pattern combos I flew was an LA25 powered ARF Streak. Model was light. LA25 ran a healthy 2 stroke. When I tried to fly it slower, mush, mush, mush. 


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