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Model Forum / Radio Controlled / Helicopters / August 2004Ball Links & Carbon Fiber tail link
What are the best ball links to use, since Rocket City are no longer available? What is the best way to assemble a carbon fiber tail link? Best to epoxy the ball link directly into the carbon fiber arrow shaft or make up an adaptor to fit into the shaft and thread the adaptor with M2 threads for the ball link? Thanks, Tom > What are the best ball links to use, since Rocket City are no longer > available? Robbie (Schluter) Miniature Aircraft, (which are about as direct a copy of schluters as it's possible to get without infringing copyright) and a whole raft of others these days. They're all pretty good. > What is the best way to assemble a carbon fiber tail link? Best to epoxy > the ball link directly into the carbon fiber arrow shaft or make up an > adaptor to fit into the shaft and thread the adaptor with M2 threads for the > ball link? Make an adaptor so allow for some adjustment. most push rod kits for tail rotors include all the necessary hardware, but an alternative is to epoxy a 3mm bolt into the carbon tube and bore out the ball link shank to accomodate the 3mm thread. (Cut the bolt head off first though, it makes it SO much easier to get it into the tube that way:-)  SignatureBeav Please note my E-mail address is "beavis dot original at ntlworld dot com" (with the obvious changes) Beavisland now lives at www.beavisoriginal.co.uk The instructions with the carbon fiber tail pushrod kit I got comes with threaded inserts for the ends and says to use JB weld to hold them in. I have been using this setup for over a year with no problems. > > What are the best ball links to use, since Rocket City are no longer > > available? [quoted text clipped - 14 lines] > the 3mm thread. (Cut the bolt head off first though, it makes it SO much > easier to get it into the tube that way:-) > The instructions with the carbon fiber tail pushrod kit I got comes with > threaded inserts for the ends and says to use JB weld to hold them in. I > have been using this setup for over a year with no problems. I don't think the OP was talking about "kits" as such, more along the lines of making up a "custom" linkage. His mention of arrow shafts negated a commercially available kit. SignatureBeav Please note my E-mail address is "beavis dot original at ntlworld dot com" (with the obvious changes) Beavisland now lives at www.beavisoriginal.co.uk I was reading Ray Hostetler's book where he mentions using a carbon fiber arrow shaft to make a tail linkage. Since Beav's post I have found the kits at HeliProz and Rick's RC and am considering them, as the kits use ~5mm tube whereas the arrow shafts are larger diameter. I am rebuilding a Nexus with several new upgrades such as using a tail boom mounted servo mount from a Kyosho Caliber, and using a Futaba GY401 gyro with 9253 servo. Since using the nice Futaba setup I wanted a smoother linkage to the tail and originally considered cutting back the wire, threading the end and mounting a ball link. However this still would leave a lot of binding through all the guides and a lot of flex. Thus studying up in Ray's book has lead me down the carbon fiber path. Besides the Nexus bashing do you have any other suggestions? As this is my first heli and am just learning I don't mind the limitations of the Nexus. Rather learn on something I don't mind breaking! Thank you for your responses! Tom > > The instructions with the carbon fiber tail pushrod kit I got comes with > > threaded inserts for the ends and says to use JB weld to hold them in. I [quoted text clipped - 3 lines] > of making up a "custom" linkage. His mention of arrow shafts negated a > commercially available kit. > I was reading Ray Hostetler's book where he mentions using a carbon fiber > arrow shaft to make a tail linkage. Since Beav's post I have found the kits [quoted text clipped - 9 lines] > up in Ray's book has lead me down the carbon fiber path. Besides the Nexus > bashing do you have any other suggestions? First of all, anyone who Nexus bashes doesn't have a clue. It was designed to do a job and it did it very well IF it was built properly, but being aimed at the first timer, plenty of them aren't/weren't and it got an undeserved bad reputaion. I've flown many a Nexus with nary a single problem and I've flown others that were absolute dogs, BUT, I can say the same thing for a lot of other heli's too. It was also never designed for 3D, but people WANTED it for that and were disappointed when it didn't hold up under the stress. Now to suggestions. Make sure there's NO slop or play in the scissor arm mixers (just above the swashplate) and if it doesn't have the ball bearing version, try to track a set down and fit 'em. Same thing with the pitch slider: no play in it and no slop. Don't overtighten the tail rotor bellcrank on the gearbox either. Other than that, and your carbon push rod with boom mounted tail rotor servo, get flying it:-) SignatureBeav Please note my E-mail address is "beavis dot original at ntlworld dot com" (with the obvious changes) Beavisland now lives at www.beavisoriginal.co.uk Sorry Beav, the Nexus bashing was not directed at you! Thanks for your comments, and I will have it up and flying soon. Tom > > I was reading Ray Hostetler's book where he mentions using a carbon fiber > > arrow shaft to make a tail linkage. Since Beav's post I have found the [quoted text clipped - 32 lines] > Other than that, and your carbon push rod with boom mounted tail rotor > servo, get flying it:-) |
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