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rtdin
Joined: 16 Mar 2008
Posts: 46
Location: Florida panhandle
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 Posted: Sat Aug 09, 2008 9:39 pm Post subject: Aeleron (sp) Push Rod Question/ CH601XL |
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Push -pull control tubes are widely used in all kinds of aircraft. Helicopters almost universally. Some have adjustable rod ends, some (Bell 206 helicopters) have some non adjustable. Saves time when the ship is returned to service. Push pull rods have a more precise feel with no slop. You don't need to keep tuning them like a guitar. You should keep all bearings and bushings in good order and lubed. I count five pivots from the torque tube to the aileron horn. With .010 slop in each, it would amount to .050 total. You would want the 601XL inboard ends to be adjustable.
Looking at some old 1965 vintage drawings for a 1500 lb 200MPH low wing all metal monoplane, The aileron push - pull tube is either 1"X.035" 6061 T6 tube with swaged ends, (a little welding req.) or 1"X.035 2024 T4 with a threaded alum insert riveted in with AN 470's for the adjustable rod end. Easiest. Looks to be about an 8' run. Rod ends are attached with AN 470 rivets. Appears to be a little weight saving since you eliminate the balance cable. You may or may not detect the reduced friction. There appears to be an opportunity to run the tube through the rear lightening holes in the rear ribs and install inboard on the torque tube. The aileron bellcrank end is also installed straight forward. A little elegance would be to put a duplicate of the bell crank inspection panel out on the wing tip. If you ever need to remove the tube for whatever reason, like sloppy bearings, it could be disconnected at both ends and slid out the tip. Other wise it would mean removing the wing. These old drawings also feature a 10' long elevator push-pull tube made of 2" alum tube but that's another story. No easy way to avoid rudder cables but its been done. But why? You will still need a cable tension gauge to check what ever cables are installed. $750.00. Some reports say that tension is lost in as little as 27 hours. Anyway, see CH's last letter. Look in the archives because someone has already done aileron push-pull tubes. Did you know that "Aileron" means little wing in French? Questions? Contact me off list.
Bob Dingley
601XL/Lyc Do not archive
**************
Looking for a car that's sporty, fun and fits in your budget? Read reviews on AOL Autos.
(http://autos.aol.com/cars-BMW-128-2008/expert-review?ncid=aolaut00050000000017 ) [quote][b]
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notsew_evets(at)frontiern
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| Posted: Sun Aug 10, 2008 5:43 am Post subject: Aeleron (sp) Push Rod Question/ CH601XL |
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The 601 XL is my third homebuilt aircraft. The first two did have push/pull tubes. They were NOT riveted anywhere. The requirement was to use two 3/16 AN bolts on each end. Seems the builders were having problems with rivets so the factory insisted on the bolts. I liked the tubing. It was super simple and easy to inspect.
Some tubes were aluminum but most were 4130...035.
For long runs there were teflon guides which were also easy to inspect...
SW
[quote] ---
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rtdin
Joined: 16 Mar 2008
Posts: 46
Location: Florida panhandle
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| Posted: Sun Aug 10, 2008 9:21 am Post subject: Aeleron (sp) Push Rod Question/ CH601XL |
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Good point on using bolts. I could live with them. Riveting does seem to be a widely accepted practice, however. All helicopters seem to go that route. Their push rods are subject to feedback vibes that an airplane would never see. They are out in the open for easy inspection. Take a look at the next helo you see. I could sleep at night either way. They are both acceptable in my limited experience.
Bob Do not archive
**************
Looking for a car that's sporty, fun and fits in your budget? Read reviews on AOL Autos.
(http://autos.aol.com/cars-BMW-128-2008/expert-review?ncid=aolaut00050000000017 ) [quote][b]
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