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Slope self launch

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Phill Tadman
Posts: 264
Joined: 18 Aug 2015, 20:38

Slope self launch

Postby Phill Tadman » 13 Jul 2017, 17:30

Hi all,

How easy is it to hand launch a 6.5m glass job yourself on the slope?

Apart from a wobble before launch this didnt look too bad



Phill

Jilles
Posts: 93
Joined: 22 Mar 2015, 10:27
Location: Australia
Contact:

Re: Slope self launch

Postby Jilles » 14 Jul 2017, 02:10

It all depends on the slope and wind speed. There will be days and certain slopes when you better not do this

SteveB
Posts: 4
Joined: 09 Jul 2017, 13:21
Location: Sacramento Californa

Re: Slope self launch

Postby SteveB » 14 Jul 2017, 12:46

Agree. I watched a 6m ship being launched by the guy on the sticks, the Tx spun around and before he had chance to grab it and correct the roll; The wings being perpendicular, it went in wing tip first. The damage was surprisingly little to the join of the outer/inner wing panel, but it was still not good to see.
To err is human, to leave home without the wing joiners is sheer stupidity.

John Vella
Posts: 14
Joined: 20 Mar 2017, 22:09
Location: UK

Re: Slope self launch

Postby John Vella » 15 Jul 2017, 10:59

Hi Phil as mentioned slope contour and wind speed is a factor. I will not self launch the 10kg+ models below 10 mph winds. The vital thing is keeping the tx sticks interference free during the launch. I have had success with the body harness (As in video) and a tx tray arrangement. The alternative is to give the tx to a competent helper and do the launch yourself. I have crashed an UNTRIMED GLIDER on self launch. So what ever method you use commit completely to a level launch and run as fast as is safe. At 70 it gets harder ! Regards John.

Jolly Roger
Posts: 162
Joined: 30 May 2015, 20:35
Location: Sutton Bank, North Yorkshire

Re: Slope self launch

Postby Jolly Roger » 15 Jul 2017, 16:51

I agree with all the foregoing, especially the need to keep the wings level and be able to get your hands to the sticks ASAP.

I'd add that when it comes to slope contours, it's not just about getting enough height and gradient to generate lift, it's also the smoothness of the airflow that counts. That last half second as the model is pushed away is critical. A gust of wind or turbulence from upwind obstacles can really spoil your day.

In other words, I'd rather launch in smooth air when the wind is marginal, than a fresh breeze that could be turbulent. Walking down from the slope edge can help find cleaner air, if this is an option.

The guy in the video has it all in his favour - plenty of wind (judging by the trees) and smooth air from the beautiful long rise of the slope. Oh yeah, and a gorgeous glider. Some folk have all the luck ,eh?

MarkDev
Posts: 210
Joined: 19 Mar 2015, 10:41
Location: Dowset

Re: Slope self launch

Postby MarkDev » 17 Jul 2017, 21:33

Would one of the stabilsation gadgets fitted to a slope launched glider be of use in those first critical seconds? As far as I understand they can be switched off when not needed. Might save a few heart stopping moments?

Phill Tadman
Posts: 264
Joined: 18 Aug 2015, 20:38

Re: Slope self launch

Postby Phill Tadman » 18 Jul 2017, 05:06

Thanks everyone, all very useful input.

Phill

Phill Tadman
Posts: 264
Joined: 18 Aug 2015, 20:38

Re: Slope self launch

Postby Phill Tadman » 18 Jul 2017, 05:09

Would one of the stabilsation gadgets fitted to a slope launched glider be of use in those first critical seconds? As far as I understand they can be switched off when not needed. Might save a few heart stopping moments?
I've put a speed compensated gyro in my Antares for exactly that purpose but havent had the courage to try it yet.

Phill


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