Ultimate Flying Wires
12-29-2005 | 06:13 PM
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Ultimate Flying Wires
For those of you that are either assembling a new Ultimate, or have already done so and used the metric sized rigging couplers and clevises that come in the hardware pack, here's a thought. Either don't use the metric couplers and clevises included in the hardware pack, or remove them if you have already used them. The reason for this is because the threads on both the couplers and the clevisies cannot be counted on to remain together. The clevises can and may pull over the threads of the coupler shanks, causing the flying wires to loosen up. Attempts to re-tighten the couplers and clevises will only produce a short temper.
The fix is to replace the metric couplers with 4-40 rigging couplers from either Dubro or Sullivan. Dubro markets two different products that work well. One of them contains only the threaded and drilled coupler rod, the other is a complete package that contains both the rods and bolt on clevises. The one with only the rod is the easiest and cheapest way to go. Use any 4-40 clevis on the rod, secure the clevisis with either a piece of fuel tubing or the retainer that was supplied with the clevis, and then apply a small dab of silicone to the clevis where it pins through the bracket to prevent any electrical noise from occurring due to metal to metal contact. You may also want to pick up a piece of 1/8" copper tubing while you're at the hobby shop in case some of the crimp fittings in the hardware kit are smashed or too short.
If you haven't assembled and installed your flying wires yet, do the above the first time, saving the irritation of having to install them twice. Be sure to harden the area under the wire brackets with thin CA after poking some holes in the balsa under the bracket with a pin, or install 3/8" dowell for a hard point before you install the brackets on the vertical and horizontal stabs.
Pat
The fix is to replace the metric couplers with 4-40 rigging couplers from either Dubro or Sullivan. Dubro markets two different products that work well. One of them contains only the threaded and drilled coupler rod, the other is a complete package that contains both the rods and bolt on clevises. The one with only the rod is the easiest and cheapest way to go. Use any 4-40 clevis on the rod, secure the clevisis with either a piece of fuel tubing or the retainer that was supplied with the clevis, and then apply a small dab of silicone to the clevis where it pins through the bracket to prevent any electrical noise from occurring due to metal to metal contact. You may also want to pick up a piece of 1/8" copper tubing while you're at the hobby shop in case some of the crimp fittings in the hardware kit are smashed or too short.
If you haven't assembled and installed your flying wires yet, do the above the first time, saving the irritation of having to install them twice. Be sure to harden the area under the wire brackets with thin CA after poking some holes in the balsa under the bracket with a pin, or install 3/8" dowell for a hard point before you install the brackets on the vertical and horizontal stabs.
Pat
01-01-2006 | 10:51 PM
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From: Left Coast ,
CA
RE: Ultimate Flying Wires
I ran into the same problem on a different plane. The clevises are metric and the supplied rod is not, thus they are not happy together and I wasn't at the time either.. Lucky I had some of that metric threaded rod that is hardened, or at least very very hard compared to 4-40 rod.
