Hangar Flying => Hangar Flying => Topic started by: marc22181 on September 24, 2007, 08:45:27 PM
Title: wing tie down hardpoints -need help
Post by: marc22181 on September 24, 2007, 08:45:27 PM
I found the text of CP-24 that describes tie down hardpoints and also found a similar description on the cozy website. The CP dimensions of "13" inboard along the leading edge, and 9.5" aft of the leading edge." Seem to put the hardpoint on the shear web. From the Cozy site, "Measure forward of the trailing edge and perpendicular to it 12-3/4" does seem to put the hardpoints aft of the shear web. Which is correct and where exactly are the measuments from? The leading edge from inside the winglets or outside? I thought the LE and Cozy had the same wing. Are dimensions perpendicular to the Leading edge or Trailing Edge? A drawing or better description would be very helpful.
Thank you, Marc
Title: wing tie down hardpoints -need help
Post by: Drew on September 25, 2007, 01:33:38 AM
There is actually a better way to do this---but don't remember where the source is---maybe someone has it at their fingertips...
On my Cozy, I have retract tiedowns. It is a piece of sturdy metal that the lower wingbolt goes thru. It tucks up into the slot between the wing and strake---and you just push on one edge---and the mechanism rotates down to expose the rope/chain attach point. Easy to construct---and very sturdy.
Title: wind tiedown hardpoints - need help
Post by: Bruce Hughes on September 25, 2007, 09:47:52 AM
Marc, Drew, and everyone
The tiedown system Drew referred to can be found at
WWW.COZYBUILDERS.ORG/CAD FILES/
I believe that Robin DuBois and Ken Miller developed them.
They should work well but the problem will be the tiedowns that go into the ground. There are some very pretty ones out there that are not worth the powder to blow them to h*ll :(
Beware. Ask other owners, NOT the manufacturers.
Bruce Hughes :D
Title: help with tie down hardpoint
Post by: marc22181 on September 25, 2007, 05:44:06 PM
Drew, Bruce, Thank you, but I was really looking for the original long ez tie down attachment as described in CP-24. I know its not as clean and neat as the retractable, but I'd just as soon not remove the attach bolts and would like the tie down points farther out on the wings. I was hoping to get the sketch from cp24 or a better description of the location coordinates .
Marc 770EZ
Title: wing tie down hardpoints - need help
Post by: Bruce Hughes on September 25, 2007, 07:47:29 PM
Marc: I asked the same question on Yahoogroups.com in early in Sept and this what I got:
-------- Original Message -------- Subject: Re: Tiedown holes From: "Dave Viglierchio" <drvii@hotmail.com> Date: Mon, September 3, 2007
Oops! We forgot to include the tie downs in the Long-EZ plans. Drill a 3/8" hole through the wings, 13" inboard along the leading edge, and 9.5" aft of the leading edge. This will assure that you do not drill through the shear web, but will be just aft of the shear web. Now flox a piece of aluminum tube into each wing, so that the tube is flush with the skins top and bottom. 3/8 O.D. x .049w 2024T3. Obtain two AN4 bolts and make up a couple of removable tie downs as shown. These can be stored in the centersection spar when not in use.
Title: wing tie down hardpoints -need help
Post by: Drew on September 26, 2007, 12:50:00 AM
Marc, The book answer on the bolts is that you are supposed to remove those annually. However, I don't----but after 5 years, I had to beat them out due to corrosion. I replaced them---and lubed them up pretty good.
I was not too worried about the surface corrosion on the bolts----but don't want the bushings to get corroded (they weren't)----harder to replace.
Your plane will withstand 50 kts without going anywhere---even when not tied down.