"Dave Houlton" wrote in message
...

OK, crank these numbers. Consider my Nimbus 2C (Experimental, so I
could
install a BRS) at 650 Kilos with water (which takes 5 minutes to dump).
The
gear strut will give 30mm on impact and the tire will give 50mm more.
The
cockpit shell is just fiberglass with no crush structure.

I pop a BRS at 300 meters AGL with the surface wind at 15 knots. What
are
my chances? Give BRS weights, 'chute diameters and descent rates.

Bill Daniels

Hi, Bill.

Too many variables there to calculate for me, but I did visit the BRS
site to gather some data. Their 680 kg. capacity system is 13.5m in
diameter, weighs 16kg, and claims 7.6 m/sec descent rate @ 5000' density
altitude. So in your proposed situation you're going to land with about
a 15kt vertical component and a 15kt horizontal component. Translating
that into G-forces and survivability I'll leave up to someone more
knowledgeable...

Dave Houlton


OK, Dave, good numbers.

This asks me to add 16 Kilo's (35 pounds) to the non-flying parts of the
glider for which I get a 15 knot descent rate when deployed (Maybe less
since I will be dumping ballast like crazy.) With a 15 knot wind I would
probably whack an obstacle at 20 knots. (Probably survivable - with
injuries.)

BTW, if I'm getting dragged by an open 'chute in that 15 knot wind, how do I
dump the 'chute?

I seem to recall that the price of this system is about $3500 - presumably
not installed. What would be the installed price?

Bill Daniels