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Alternative launching thread

Old 12-05-2015, 10:24 PM
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FlyWheel
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Lightbulb Alternative launching thread

Belly landers* cannot simply be placed on the ground and throttled up until they gracefully take to the air (obviously), they must be launched some other way.

So, aside from the usual methods (throwing, discus, high/upstart, winch or towing) what other, alternative methods have WattFlyers used or come up with to achieve successful take-off of their "belly landers*?

I'm curious to hear what methods our imaginative engineers have used/come up with.






*(Planes without landing gear)

Last edited by FlyWheel; 12-05-2015 at 10:39 PM.
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Old 12-05-2015, 10:43 PM
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crxmanpat
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All of the belly landers I've had have been hand launched. From your list, the only thing missing I think is a catapult (also called a bungee launch). Here's an example:

https://www.youtube.com/watch?v=QBxbqktG5Cg
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Old 12-05-2015, 11:16 PM
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fhhuber
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Take-off dollies.

Air drop from another plane.
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Old 12-06-2015, 01:23 AM
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Originally Posted by crxmanpat View Post
All of the belly landers I've had have been hand launched. From your list, the only thing missing I think is a catapult (also called a bungee launch). Here's an example:

He did mention Histart allbeit spelt differently.


But, I do like this method..... (rocket)


https://www.youtube.com/watch?v=JXXKBVEfMU0
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Old 12-06-2015, 06:28 AM
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solentlife
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This is a compilation video I made to illustrate a Bungee Launch system ... primarily for Pushers and EDF's ... but tractors could be done IF a LINE release mechanism can be used before running motor.



For hard surfaces ... the Dolly is about the best ...

Nigel
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Old 12-06-2015, 05:32 PM
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Glacier Girl
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Umm, and I have a few belly landers that can easily take off from grass/gravel/pavement all by themselves. Skid tape on the bottom protects them and makes em quite slippery.
And being high mount pusher setups keeps the prop safe.
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Old 12-06-2015, 05:58 PM
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JetPlaneFlyer
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The Durafly Me-163 Komet i picked up recently in the Hobbyking sale uses a dolly that's dropable using a servo'magnet retention gizmo. The dolly is a a scale copy of the one used by the real Me-163 and it works very well.

Here's a video, the dolly is dropped after I turn back toward myself after taking off (to save a long walk!)

(if you don't see it give it a few minutes, video uploading now)
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Old 12-10-2015, 01:54 AM
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I can see why you have the controlled release, that bird takes some distance to leave the ground. That would be quite a walk ("Hey kid, you wanna make a buck?")
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Old 12-10-2015, 06:15 PM
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Xpress..
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There's a lot of belly lander models that can ROG. The TwinStar BL does it pretty elegantly in this video:

https://youtu.be/9i4nzkkcuGI?t=1m37s

With enough power and a smooth enough bottom then you can slide off grass pretty easily.
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Old 12-10-2015, 08:10 PM
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solentlife
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Originally Posted by Xpress.. View Post
There's a lot of belly lander models that can ROG. The TwinStar BL does it pretty elegantly in this video:

https://youtu.be/9i4nzkkcuGI?t=1m37s

With enough power and a smooth enough bottom then you can slide off grass pretty easily.
My T45's can do it ....

Nigel
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Old 12-10-2015, 09:21 PM
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JetPlaneFlyer
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Originally Posted by FlyWheel View Post
I can see why you have the controlled release, that bird takes some distance to leave the ground. That would be quite a walk ("Hey kid, you wanna make a buck?")
Yeah that's true, and in the grass with all the fallen leaves it's not easy to find the dolly. The small RPM prop means it takes a little while to get up to speed.

The controlled release is fun. You just need to make sure to clean out the recess where the dolly locates after every belly landing because any mud in there makes the dolly jam up.
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Old 12-11-2015, 08:45 AM
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solentlife
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Plus of course the good old Polaris !!

Nigel
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Old 12-12-2015, 04:27 AM
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Originally Posted by Panther View Post
He did mention Histart allbeit spelt differently.


But, I do like this method..... (rocket)


https://www.youtube.com/watch?v=JXXKBVEfMU0
JATO! now that's one I heven't seen before!

Originally Posted by Xpress.. View Post
There's a lot of belly lander models that can ROG. The TwinStar BL does it pretty elegantly in this video:

https://youtu.be/9i4nzkkcuGI?t=1m37s

With enough power and a smooth enough bottom then you can slide off grass pretty easily.
Assuming, of course that you have prop clearance...
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Old 12-12-2015, 11:41 PM
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mclarkson
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Originally Posted by fhhuber View Post
Air drop from another plane.
I was gonna say all I've ever done is thrown mine but this reminded me that I have, in fact, done the air drop

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