On Saturday, November 10, 2018 at 9:54:22 PM UTC-5, wrote:
On Thursday, November 1, 2018 at 6:18:55 PM UTC-6, Martin Gregorie wrote:
On Wed, 31 Oct 2018 09:06:05 -0700, JS wrote:
Saw the ad in the AMA flyer for their Expo in Pomona. SSA Region 12 has
a presence there.
AMA Expo:
https://amablog.modelaircraft.org/am...8/10/expowest-
program-2018-web.pdf
Fruity Chutes looks like a good source for chutes, including ballistic
chutes.
Anything from 12" diameter up.
Jim
https://fruitychutes.com/
The Fruity chutes I looked at would all be unlikely to survive their
first winch launch: thie all emphasized light weight, which is exactly
what you don't want for winching. The winch parachute is inline between
cable and shock cord. The tension being carried through the 'chute keeps
it closed during the 60-65 knot launch, when the 'underside' of the
'chute is facing the winch and the shock cord, connecting chute to
glider, it attached to the top centre of its bell. If the launch didn't
finish it off a light weight chute, then being dragged back to the winch
after the launch would probably do the trick.
That is why traditional winch chutes are made of heavy duty canvas with
typically four shrouds made of 50-75mm heavy duty webbing sewn onto the
shock cord attachment at the centre of the chute. Current manufacture
chutes often use plastic fabric, but its just as thick as the canvas it
replaces.
--
Martin | martin at
Gregorie | gregorie dot org
What Martin said..
Try this for a (relatively) cheap 'chute. Bite the bullet and buy one Tost small winch 'chute and take it to your local rigger and ask how much to make a replica. There's a good chance that will be much less than what you paid for the 1st 'chute.
We have been using this type of military surplus chute for years now and they hold up very well. The trick is to 'fly' the chute reasonably close to the winch and then drop it but not drag it over the ground.
https://www.ebay.com/itm/NEW-UNISSUE...-1:rk:140:pf:0
Unfortunately, they have become harder and harder to find. Fortunately, I bought a few at a surplus store in TX, when they still had them. ;-)
Uli
'AS'