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Mar 21, 2002, 12:16 PM
Chief Turnip Inspector

1/16 Ply Bungee Hook?


Hi All,
Any thoughts about using 1/16 ply for a bungee hook for a 28-30 ounce plane?


I'm getting ready to cut some parts, and am trying to decide on 1/16, 1/8, or just buy a glider hook from Hobby Lobby!


Thanks
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Mar 21, 2002, 01:05 PM
Pres. Uff-Da Air

glider hook


Tiggs,
My advice would be to just keep it simple, Anchor a plate with a blind nut near the nose and screw in a HL tow hook use the small diameter and cut it to 1/2 the original length so the ring will slip off easily. I'm flying a 45oz Focke Wulf, a Velekum Twist and a Ryan Helcat from a PVC bungie launcher. I have launched a 2 meter sailplane and a couple of other planes using this method. If I want to launch a plane with no front mounted tow hook I simply use a tow hook and adjustable rail. Tape the rail to the nose of the aircraft using strapping tape and launch. I use 30ft of 5/16 bungie rubber 18" of string, stretch this to 3x's it's original length and watch 'em go. Flying speed is usually achieved in the first few feet, after that just go for altitude and turn the motor on. Note: The FW bounces about 6ft out if I don't have enough tension. Sailplanes need very little tension but it is a hands free launch.
Uff-Da Pete
Mar 21, 2002, 01:27 PM
Lithium Member
Herb's Avatar
I use 1/8 ply on almost all my edfs. You can harden it with ca if it tends to scrape off. A short carbon rod glued in at an angle will work too.
Mar 21, 2002, 05:21 PM
Chief Turnip Inspector
Thanks for the input guys.

I'll probably try the 1/8 ply to see how my little designed hook comes out, but where would one get a hand launch tow hook from?
Mar 21, 2002, 05:57 PM
Acme Powered!
Joe Elston's Avatar

Tow Hook


I ussually just epoxy in a plate of 1/8 ply with a 4/40 blind nut in it. Drill a whole in the fuselage and match the blind nut and hole up. Then take a piece of 4/40 rod and bend it to the size you want your hook. Next take a 4/40 nut and install on the threaded part of the rod. Screw the rod into the blind nut and tighten the nut to make the rod straight and tight. Its light and works great. You dont need a big hook just make sure its open, I bend mine at a 90% angle.
Hope this helps
Joe