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Sep 14, 2011, 08:25 PM
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AndyInKent's Avatar
Discussion

Build your own launch ramp, well I did anyway :)


Hi all, though I'd just share a few pics of my latest project.
I need a nice big launch ramp to launch my last project (a bloody heavy fast fibreglass pusher jet) so been looking for bits to make one.
On way home from work today I found a bent up metal ikea type frame thing, after a couple of hours with a tube cutter, head scratching and lots of beer I ended up with the enclosed

Still not finished but its looking good and very stable!
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Sep 14, 2011, 10:52 PM
Shelter Kitty "Orange Death"
bartricky's Avatar
I think we call that a "shopping cart"...
Sep 15, 2011, 05:40 AM
Registered User
lipoflyer's Avatar
I like it. It's something that I wish my club had
Sep 15, 2011, 09:25 AM
Registered User
I've been launching my SkyFun with my home-made PVC launcher for a little over a month now, but I still haven't taken any pictures of it yet.
I know my plane is lighter than yours (about 19 ounces AUW), but I still think you have too much height and up-angle at the front. Unless you're going to invent a launch mechanism that is parallel with your ramp, you'll put too much stress and drag on your plane with a typical elastic launcher that is fixed to the ground out ahead of your ramp.
A ground-based mechanism is usually easiest to accomplish, and that requires a much lower ramp height and angle than most people think.
My ramp is only 3 feet long, and no more than 12 inches high at the front and about 10 inches high in the back, and uses 12 feet of surgical tubing stretched out another 12 feet to 24 total feet.
Launches are perfect every time.
What's your plan for the accelerating mechanism and release catch?
Sep 15, 2011, 01:08 PM
Champagne Supernova
Remote_Pilot's Avatar
Quote:
Originally Posted by soundguy63
I've been launching my SkyFun with my home-made PVC launcher for a little over a month now, but I still haven't taken any pictures of it yet.
I know my plane is lighter than yours (about 19 ounces AUW), but I still think you have too much height and up-angle at the front. Unless you're going to invent a launch mechanism that is parallel with your ramp, you'll put too much stress and drag on your plane with a typical elastic launcher that is fixed to the ground out ahead of your ramp.
A ground-based mechanism is usually easiest to accomplish, and that requires a much lower ramp height and angle than most people think.
My ramp is only 3 feet long, and no more than 12 inches high at the front and about 10 inches high in the back, and uses 12 feet of surgical tubing stretched out another 12 feet to 24 total feet.
Launches are perfect every time.
What's your plan for the accelerating mechanism and release catch?
I think the beers told him hes just going to go WOT and liftoff.
Sep 15, 2011, 04:19 PM
Registered User
AndyInKent's Avatar
Quote:
Originally Posted by soundguy63
I've been launching my SkyFun with my home-made PVC launcher for a little over a month now, but I still haven't taken any pictures of it yet.
I know my plane is lighter than yours (about 19 ounces AUW), but I still think you have too much height and up-angle at the front. Unless you're going to invent a launch mechanism that is parallel with your ramp, you'll put too much stress and drag on your plane with a typical elastic launcher that is fixed to the ground out ahead of your ramp.
A ground-based mechanism is usually easiest to accomplish, and that requires a much lower ramp height and angle than most people think.
My ramp is only 3 feet long, and no more than 12 inches high at the front and about 10 inches high in the back, and uses 12 feet of surgical tubing stretched out another 12 feet to 24 total feet.
Launches are perfect every time.
What's your plan for the accelerating mechanism and release catch?
We shall see when I give it a test
I am using an elastic launcher with the ramp, one thing I havent done yet is a small wheel on the top strut for the elastic to run over.
It should be okay as I am not going to add any more tension on the elastic than I use now, just want to get the launch a bit higher
Sep 15, 2011, 04:20 PM
Registered User
AndyInKent's Avatar
Quote:
Originally Posted by FlyHighSelllow


I think the beers told him hes just going to go WOT and liftoff.
Lol, huh?
Sep 15, 2011, 07:06 PM
Registered User
Yes a wheel near the top will help with the tension angle at the instant of launch, hopefully that won't be offset by downward pull once the plane clears the rails.
I'm looking forward to hearing about the results!
Sep 16, 2011, 07:12 PM
Registered User
AndyInKent's Avatar
Quote:
Originally Posted by soundguy63
Yes a wheel near the top will help with the tension angle at the instant of launch, hopefully that won't be offset by downward pull once the plane clears the rails.
I'm looking forward to hearing about the results!
What like this? :P

The long runs are now held together with elastic inside so easy to set up
Dec 07, 2011, 08:01 PM
Registered User
AndyInKent's Avatar
You can see this in action

www.youtube.com/watch?v=riF_9LUYYlQ


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