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#11
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Pretensioning cables
Morgans wrote:
"Gig 601Xl Builder" wrote Yep 6061T6. BUT the problem isn't showing itself in the rudder cables it is in the ailerons. Wood wings, or metal? Metal... also 6061-T6 |
#12
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Pretensioning cables
cavelamb himself wrote:
Morgans wrote: "Gig 601Xl Builder" wrote Yep 6061T6. BUT the problem isn't showing itself in the rudder cables it is in the ailerons. Wood wings, or metal? The 601s are all aluminum. Zodiac designed by Chris Heinz. Break Gig, you better dig into that. It sounds like something has "adjusted" it's position. It might innocent, but you need to know for sure WHY the change. My next door neighbor on the airport built an 601-HDS. It looked pretty solid. The cables just are not long enough to show any significant stretch. Not at 40 pounds tension. Check for a loose pivot point? Or a bent support? Or? Or the cable ends! Thimbles in place? Have they changed shape any at all? Check the nicopress collars with a go/no go gage? Any detectable wear in the connection tangs? Does this airplane have the hingless aileron hinges? (Althought I seem to think there was a pushrod to the aileron) You are right and it could be any of those things but as I mentioned this hasn't happened yet to my yet to be completed airplane so as I mentioned I don't have access and the people who have mentioned the problem SAY they don't see any problems. And you also right that there is a short push rod between the bell crank and the aileron. |
#13
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Pretensioning cables
Bryan Martin wrote:
Bryan, I'd not noticed you on RAH before. You know the issue I'm asking about. Maybe you can add something that I've left out that could help. |
#14
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Pretensioning cables
You are right and it could be any of those things but as I mentioned this hasn't happened yet to my yet to be completed airplane so as I mentioned I don't have access and the people who have mentioned the problem SAY they don't see any problems. And you also right that there is a short push rod between the bell crank and the aileron. So what do we have in the cable route? One pulley on each side??? -- Richard |
#15
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Pretensioning cables
cavelamb himself wrote:
You are right and it could be any of those things but as I mentioned this hasn't happened yet to my yet to be completed airplane so as I mentioned I don't have access and the people who have mentioned the problem SAY they don't see any problems. And you also right that there is a short push rod between the bell crank and the aileron. So what do we have in the cable route? One pulley on each side??? Nope straight line from the stick to the aileron bell crank. The cable balance side of the bell crank makes a turn through fair leads made from some pretty tough nylon. |
#16
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Pretensioning cables
On Nov 18, 12:33*pm, Gig 601Xl Builder
wrote: Anyone have a good method for pretensioning cables. There has been some issues of late with 601Xl control cables getting loose after the first few flights. I'm looking for info on ways to pretension 1/8" galvanized cables that are tensioned between 22 and 40 lbs. I have been working on a well known VlJ that recently declared bankruptcy. It is the first aircraft that I have ever worked on that discusses pretensioning cables. Basically they tension the cables to a figure well above nominal. Then back off and retension to nominal. John Dupre |
#17
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Pretensioning cables
On Sun, 30 Nov 2008 18:35:29 -0800 (PST), John
wrote: On Nov 18, 12:33*pm, Gig 601Xl Builder wrote: Anyone have a good method for pretensioning cables. There has been some issues of late with 601Xl control cables getting loose after the first few flights. I'm looking for info on ways to pretension 1/8" galvanized cables that are tensioned between 22 and 40 lbs. I have been working on a well known VlJ that recently declared bankruptcy. It is the first aircraft that I have ever worked on that discusses pretensioning cables. Basically they tension the cables to a figure well above nominal. Then back off and retension to nominal. John Dupre The humble old Cherokee 140 has an interesting pretensioned control run ...to the ailerons I think. the cables run from the surfaces via the usual pulleys then terminate in sections that look for all the world like bicycle chain. these are run up past two sprockets which are bolted together. the positions that the sprockets are in when bolted determine the amount of cable tension in the outer runs. past the sprockets the run to the yolk is actually almost untensioned completely. this allows the cables to, in effect, be used in a pretensioned state while the yolk controls feel light and friction free. it is a damn cunning arrangement that works superbly. Stealth Pilot |
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