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Old Apr 12, 2012, 09:52 AM
mikes68charger is offline
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Why kamikaze pilot wear helmet
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How to hand launch a pusher plane


I guess I should of asked this before now as I'm sitting in the emercy room wateing to get stitchs

I have a HET F20 70mm EDF that was a bungy launch.

I hate bungy. And to me it flew sub par. Sapac MB1 on 50c 5s 3400

So I converted it to a pusher set up with an ARC 28-58-1 on 40c 4s 2600 with a 6x4 prop with 5.5 thrust and 160 prop speed

When I threw it, it sliced my hand 5 time and cut my finger nail in 1/2

And broke the prop. But I flew it for 3 min before I found out I was bleeding every wear.

And it fly 2 times better.

So except wearing a glove. How do you guys hand launch a pusher with out being in the hospital with a up set wife?
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Old Apr 12, 2012, 10:27 AM
Mark Wood is offline
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characters welcome!
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Followthrough. Don't leave your hand hanging up where the plane will get it when it goes by. Honestly.

mw (RiteWing pilot)
Old Apr 12, 2012, 10:30 AM
LesUyeda is offline
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Discus Launch. Grab a wingtip, spin and release.

Les
Old Apr 12, 2012, 11:36 AM
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I used the follow through method on my Stryker and was OK.
The factory approved method was to launch it power off and add power once it left your hand.
Old Apr 12, 2012, 11:38 AM
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I hand launch pushers with 14" props all the time. Have yet to get a nick, much less a cut.
Be careful where you hold the plane relative to the prop. And launch with vigor.
Old Apr 12, 2012, 11:45 AM
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All of the above are correct, and for sure the safest way is to keep the throttle at zero until after you throw/release. Kinda tough with the f-20 though, as it isn't really much of a glider, eh?
Take a look at all the "similar threads" right down below this post - some interesting reading there....
Josh
Old Apr 12, 2012, 11:59 AM
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Use PVC launcher
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Old Apr 12, 2012, 12:26 PM
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follow through. The F7U in the pic has a 7 X 5 prop and the CF-105 has a 8 X 6 prop. Notice how far my hand is away from the prop at he time the prop could contact my hand.
Old Apr 12, 2012, 01:02 PM
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When I started to build pushers as slower parkflyers, with larger props, I got a few cuts as well. So I usually launch with power off.
Some of my pushers can be launched from the wing tip.
Old Apr 12, 2012, 02:47 PM
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Why kamikaze pilot wear helmet
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Thanks guys. I ended up with 20 stitches and a split finger nail

Since this was a maden flight I think now she has the power to be thrown underhand. The f20 is not very easy to hold on from bottom as the wings are flush with the bottom of the bird so you can only hold on behind the wing

And I don't think there is any glide ratio on a jet like this.

But thanks for the ideals

So 2nd question. It turned out the prop tips broke off at landing and not in my hand. So if you turn the break feature dose the motor know where to stop it so it dose not hit the ground?
Old Apr 12, 2012, 02:52 PM
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Quote:
Originally Posted by mikes68charger View Post
Thanks guys. I ended up with 20 stitches and a split finger nail

Since this was a maden flight I think now she has the power to be thrown underhand. The f20 is not very easy to hold on from bottom as the wings are flush with the bottom of the bird so you can only hold on behind the wing

And I don't think there is any glide ratio on a jet like this.

But thanks for the ideals

So 2nd question. It turned out the prop tips broke off at landing and not in my hand. So if you turn the break feature dose the motor know where to stop it so it dose not hit the ground?
.
The prop stops, but it may windmill just a tad. With any luck at all, any ground contact will just push it out of the way.
Old Apr 12, 2012, 10:35 PM
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I have a T-38 and F-15 pusher, also a couple of super bandit pushers. I find that with the power that I have on the back end of these planes, I can just hold them by the end of the wing and swing it up at about a 45-60 degree angle (same motion as throwing a frisbee), and I never have torque issues and it is a piece of cake to launch. I'm scared of the moving part in the back of the plane and won't even think of risking it with a conventional toss.

Sorry about your arm!

Mike
Old Apr 13, 2012, 12:06 AM
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Quote:
Originally Posted by Mark Wood View Post
Followthrough. Don't leave your hand hanging up where the plane will get it when it goes by. Honestly.

mw (RiteWing pilot)
Exactly ! I have more hand launch pushers than any other style of plane and have never been so much as nicked by a prop. Throw it like you mean it and follow through. Its scary to think what the prop on my Demon would do to ones fingers. A 6X4 prop spinning at 40,000+ rpm is gonna leave a mark.
Old Apr 13, 2012, 01:13 AM
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It must have a machinegun
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I've never broken a prop on landing. I've broken a weak engine mount a few times, but not a prop. Then again you have a heavy plane for such a small prop. Try a different brand of prop. Make sure the brake is really on.
I presume you are landing on grass.
Old Apr 13, 2012, 01:23 AM
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+1 A distinct downwards follow through gets the job done safely.


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