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Re: Hmodel ASH 25 Mi

Posted: 09 Jun 2017, 22:54
by eric friend
Thanks Phil,
My bungee arrangement will be very simple with just a straight pull on to a strongly mounted Kavan hook fitted to the underside of the fuselage approximately halfway between the C of G and the nose. As it is only necessary to get the model a few inches off the ground at a velocity in excess of the model's stalling speed, there shouldn't be a problem.
Rise-off-ground bungee launches were being done successfully 25 years ago as can be seen on the following video which was shot be one of our group who still flies regularly at Thurnham.

Go to 2 minutes into the video to see the successful launch of a large heavy model using a simple v-bungee arrangement with the ends being held by fellow fliers. The first attempt can be seen at 1 minute in, when the bungee wasn't stretched sufficiently to allow the model gain flying speed.
I have heard of some people trying to bungee launch using the normal tow release facility with the inevitable disastrous results, so don't be tempted to go that route.
Best regards, Eric
PS - I found the problem with the outer aileron - embarrisingly simple to resolve! :oops: :oops:

Re: Hmodel ASH 25 Mi

Posted: 10 Jun 2017, 05:17
by Phill Tadman
Thanks Eric,

I'm thinking of trying something similar, using the method described on the forum http://www.scalesoaring.co.uk/VINTAGE/H ... apult.html.

Please post some more videos, your Ash has such presence when flying.

Phill

Re: Hmodel ASH 25 Mi

Posted: 10 Jun 2017, 07:46
by Barry_Cole
PS - I found the problem with the outer aileron - embarrassingly simple to resolve! :oops: :oops:

1/ Plug it in.??

2/ Plug it in the correct way round...??

3/ ?????

:shock: :shock: :shock: :shock:

BC

Re: Hmodel ASH 25 Mi

Posted: 10 Jun 2017, 07:46
by VinceC
The launch system I described in the Articles served me well for many years. The beauty of the system is that there is no strain on the glider when set up ready for launch, therefore no need to hang on to it. It does'nt even require extra people to help, so the solo flyer can launch their model. I used it just for the Swift, but of late, since the death of my one and only flying buddy, I am thinking of converting all my large models by adding a scale-ish nose hook.

Re: Hmodel ASH 25 Mi

Posted: 10 Jun 2017, 11:14
by Nimeta
Hi Eric,
My 25 is never flying at the slope.
Only with SLS or by tow
But i install the hook for bunge and now i only Need time for go flying.
My Bungee System is also nearly finish.
It is 14m rubber and 15m rope.
The rubber is bonded to a Circle for safety.
The System is for gliders Up to 20kg.

Regards Christian



Before i have the Hmodel 25 I have an ASH 25 1:4 with 12kg- i start it also by Hand
[youtube][/youtube]

Re: Hmodel ASH 25 Mi

Posted: 10 Jun 2017, 13:40
by VinceC
As an extra thought, when I launch my gliders I used MPX 4000 tray Tx securely fastened to my body so I knew exactly where the controls were and it left me 2 hands free. Since I moved to Taranis, I have now got a very useful tray attachment which does the same thing

Re: Hmodel ASH 25 Mi

Posted: 11 Jun 2017, 23:34
by eric friend
Yes Vince, I have a similar arrangement with a tray and waist strap to securely hold my transmitter in place when I am launching my own models. However the waist strap has to be quite long these days! :lol:

Re: Hmodel ASH 25 Mi

Posted: 18 Jun 2017, 09:24
by eric friend
Barry_Cole wrote:PS - I found the problem with the outer aileron - embarrassingly simple to resolve! :oops: :oops:
1/ Plug it in.??
2/ Plug it in the correct way round...??
3/ ?????
:shock: :shock: :shock: :shock:
BC
Very nearly correct Barry
My tiny tip aileron is y-leaded to the main aileron lead back at the receiver and I had inadvertently parallelled it with the speed flap on the same side, so to be on the safe side I took the tip extensions off rather than fiddle about with the wiring on the slope.
It looks much better with the extended tips fitted. David Ashby, RCM&E editor, took a few great photos of my 25 in flight with the tips on and so I'll post them here later today.

Re: Hmodel ASH 25 Mi

Posted: 27 Jun 2017, 19:39
by eric friend
Here's the link to three photographs taken by David Ashby, RCM&E editor.
Scroll down to Reply No 2577 to see the photos, the last one being of Si (swarrans) getting the 25 away safely on its second flight.
http://www.rcmf.co.uk/4um/uk-regional-g ... rt-2/2560/

Re: Hmodel ASH 25 Mi

Posted: 27 Jun 2017, 21:18
by VinceC
ASH-25?