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Bungee Launch 6m Scale (Read 3049 times)
Chris Veitch
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Bungee Launch 6m Scale
02/05/13 at 14:06:35
 
Hi All

Can anyone advise what length and specification of  cord and line (plus supplier) to use to solo launch a 6m 11kg scale job on the slope.

I have seen the recent video of the 8.4m launch but don't know the specs.

Thanks
Chris
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« Last Edit: 02/05/13 at 14:07:01 by Chris Veitch »  
 
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Lars Wikstrom
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Re: Bungee Launch 6m Scale
Reply #1 - 02/05/13 at 19:45:43
 
Hi Chris,

I have used a bungee from EMC-VEGA with excellent result. Very good quality and service from the supplier.
http://www.emc-vega.de/en/high-start/Megarubber-bundles/ground-start/ground-star...

Lars
PS. I have used a softball to slow down the line from the foot release.
http://youtu.be/ixnzZvzxVdk
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Chris Veitch
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Re: Bungee Launch 6m Scale
Reply #2 - 02/07/13 at 12:07:58
 
Lars,

Thanks I have ordered the bungee and note the use of the ball 2 questions on set up
- how much line are you using
- where are you positioning the tow hook ?
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Elliot Howells
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Re: Bungee Launch 6m Scale
Reply #3 - 02/07/13 at 21:07:57
 
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Lars Wikstrom
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Re: Bungee Launch 6m Scale
Reply #4 - 02/08/13 at 08:17:17
 
Hi Chris,

I will reply later on the things you asked about. While waiting for that;  ideally you want a pin going into the fuz and dropping of after the launch, saves the fuz from a hook grabbing hokd of the ground while landing.

Cheers
Lars
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Elliot Howells
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Re: Bungee Launch 6m Scale
Reply #5 - 02/08/13 at 09:39:08
 
I've designed a special device for this very job, I'll post a pic later.
Ell.
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Elliot Howells
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Re: Bungee Launch 6m Scale
Reply #6 - 02/13/13 at 20:30:45
 
should be fairly self explanatory, the notch points down, obviously Wink

Ell.
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Anthony
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Re: Bungee Launch 6m Scale
Reply #7 - 02/13/13 at 23:33:40
 
Elliot....have you tried this yet....?  Ant.
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Chris Veitch
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Re: Bungee Launch 6m Scale
Reply #8 - 02/14/13 at 17:43:08
 
Hi Elliott

I get the basics but what do you do with it for landing

Do you retract it or drop it ?
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Elliot Howells
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Re: Bungee Launch 6m Scale
Reply #9 - 02/14/13 at 20:08:48
 
Hi Chris (and Ant),

it is as yet untested, but it fits in the nose release and stays there all flight.

The point being, there is no additional hole made, no likelihood of snagging on the undercart.

Each hook would need to be turned to the diameter of the tow release and then drilled and filed so that the tow release tongue engages correctly - a five minute job, especially if you haven't fitted it to the model yet.

Ell Smiley
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sp250
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Re: Bungee Launch 6m Scale
Reply #10 - 02/14/13 at 21:19:49
 
Great idea but what about the position of the hook in the aerotow tube?
All winch and bungee launched thermal soarers have the hook on the bottom of the fuz about 30* angle in front of the CG, so they rotate on the line at take off/hand launch and get to the maximum height before coming off the hook.
John
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Elliot Howells
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Re: Bungee Launch 6m Scale
Reply #11 - 02/14/13 at 21:32:05
 
John,

as we're not trying to launch to altitude, simply straight ahead off a slope, the position of the hook on the nose is fine.

winching, now that's a different kettle of fish Wink


Ell.
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sp250
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Re: Bungee Launch 6m Scale
Reply #12 - 02/14/13 at 21:52:15
 
Ell
Sorry didn't re - read the first post. 
I was thinking of bungee or winch launches from the flat as well as the slope.
Cheque is in the post.
John
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Chris Veitch
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Re: Bungee Launch 6m Scale
Reply #13 - 02/16/13 at 17:54:23
 
Thanks Elliott

I understand, seems a good plan if you have one of those releases.

The 45 degree pin also seems a good plan per the link below. This will suit my old DG500 as is just has an under  belly tow release

http://www.scalesoaring.co.uk/VINTAGE/HintsTips/Articles/Catapult/catapult.html
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Lars Wikstrom
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Re: Bungee Launch 6m Scale
Reply #14 - 04/21/13 at 16:58:03
 
Here is a late answer

The link below shows a VERY nice solution. Best luck. Lars
http://www.rc-network.de/forum/showthread.php/39839-Alles-%C3%BCber-Flitschen-Pr...

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