Help launching planks - RC Groups
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Sep 11, 2004, 07:09 PM
Jerry Leonard

Help launching planks

Having problems trying to launch plank type, M-60 etc., through dirty air trying to reach the lift zone. The planes pitch up or down or do wing overs into the ground, just can't throw fast enough to punch through. On a slope where wind is in your face there is no problem lauching but here the wind blows stright up off the face with a rotor behind. Its a little scarry climbing down the rocks to launch over 1000' drop. Maybe small bungee launcher?
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Sep 11, 2004, 07:16 PM
R U killing the kittens?
artmonster's Avatar
how 'bout a BIG bungee? !!!!!

those M60's are pretty tough....and a doubled up set of fat surgical tubing will get you to the good stuff in no time !

not to mention the giggle factor.
Sep 11, 2004, 07:41 PM
Jerry Leonard
do I need to build a launcher or can it be hand launched with the bungee? I would like to keep it simple as possible.
Sep 11, 2004, 07:47 PM
Free as a bird now.
Where are you flying? I would really like to head over to Molokai some day and fly the cliffs near Kalaupapa with you!

BTW, it sounds like you are launching in a rotor. Is there no way to get right to the edge of the cliff for launch?

The simplest bungie launcher is just a few yards of heavy surgical tubing (the stuff the spear fishermen use on thier spearguns), and maybe another 50 feet or so of monofiliment fishing line.

You attach a stake at the tubing end, and tie a metal ring on the fishing line end. You attach a hook to the bottom of the plane, and the launch is a simple matter of walking the plane back for a good stretch and then you let go.
Last edited by Brian Courtice; Sep 11, 2004 at 07:54 PM.
Sep 11, 2004, 07:59 PM
R U killing the kittens?
artmonster's Avatar
put the hook on the plane just forward of the wing LE for high launches, and closer to the nose for more horizontal launches.
Sep 11, 2004, 08:07 PM
Jerry Leonard
more like redirected winds spilling over the top, the rotor is up about 100' and behind. It dosn't come into play until landing and is just a matter of diving through shear into calm air. Edge launch is best but not the safeiest(sp) at this spot. Jump on da boat and come fly anytime.
Sep 11, 2004, 08:09 PM
Jerry Leonard
just like mini high start, easy, I'll go strip the three prong
Sep 11, 2004, 09:07 PM
Registered User
windsox's Avatar
another option for those conditions is to get one of mike bakers sabre wings It is a cranked delta ( lower aspect ratio bat/ bluto type planform) it is set up so that it can be side arm or discus launched . Should be no problem to throw it to clean air.
Sep 11, 2004, 09:46 PM
Detail Freak
target's Avatar
Same problem with my BW Zipper;
Dial in some up trim(1/16"??) before you toss out. Then dial it out, a little at a time and watch 'er speed up.
You can do this many different ways, I needn't elaborate....
Good Luck,
Sep 11, 2004, 10:45 PM
Registered User
timmig's Avatar
"put the hook on the plane just forward of the wing LE for high launches"

Forward of the leading edge??? That would be interesting!! That would be out in front of the wing>? How about just ahead of the CG-- or on the nose. IMHO-- would be fun to launch that way.
Sep 12, 2004, 03:04 AM
Registered User
wish's Avatar
@ Timmig... the M60 has a fuselage

Greetings from Holland,

Sep 12, 2004, 04:04 AM
Registered User
Daemon's Avatar
Ya, launching the M60 in those conditions is tough because
its stall speed is faster than you can throw it, and you're probably
standing where there's turbulent air blowing at your back. Generally it's
best to hold it by the nose in front of the wing, walk out to the lip, and
hold it nose down in the wind, and give it a push. Another thing I've
done is sit down on the ground just behind the lip (where it's almost dead
still) and give it a good heave from there. There's a spot there
where it won't get pounded by turbulence until it crosses the
shear layer, and then it's flying anyway. Where there's problems
is if the slope/cliff face is ragged at the top and there's
a ledge or two down from the top churning up the air.. In that case,
the bungee would be your best bet.

Sep 12, 2004, 04:48 PM
Jerry Leonard
Bungee Works
I put together a couple yards of surgical tubing and about ten feet of sugi with swivels and a ring on the end. Drove short piece of rebar in the ground and attached the line.
Make a hook that attached to small piece of ply. taped it to fuse about 1 1/2" in front of leading edge. Hooked in the plane, held it in left hand at base of tail, walked back applying tenshon and launched, problem solved. Mahalo to everone that responded. Jerry

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