1 glider - 11 waterballast trails

On Jun 19, 11:46*pm, Dave Nadler wrote:
On Tuesday, June 19, 2012 6:49:16 AM UTC-7, John Galloway wrote:
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I'll ignore the obnoxious comments below.

Hydraulic pressure is a really big problem.
When a glider spins, ground-loops, etc - lots of pressure !
Prototype ASW-22 was lost in a spin test with water - wing exploded.
Another had wing exploded during ground-loop.
Some systems to alleviate pressure rely on partial air in tank - marginal..
New gliders need extreme amounts of water to get to required high wing loading.
So.... Lots of tanks !

All of which means mechanical linkages (multiple wing panels)
get really unwieldy and impractical.

I designed the new dump system requiring:
- quickly field-removable valves for cleaning debris or replacement,
- very high reliability compared to silly servo-based systems,
- absolute minimal mechanical complexity in wings,
- flush with outer wing surface for minimal drag (without silly dangling mylar)

Valves have operated in a test rig 150,000 cycles without problem.
Try that with your silly servos.

If you pump in pond water a valve can jam with debris, small fish, or large fish.
Enough deposits and you need chapstick.
Or, pull it out and clean or replace it.

Significantly better than the alternatives we believe...

Hope that's clear !
Best Regards, Dave "YO electric"

Cool! Sorry for the snarky comments. I loved everything about my old
Discus CS except the ritual of sealing the water ballast plugs -- but
it sounds like you don't have 11 of those, and an important safety
improvement. And my 27 promptly choked on a bit of epoxy in the valve
on its second outing, requiring an interesting disassembly. Those 11
valves ought to dump pretty fast too.
John Cochrane