Friday, November 28, 2014
Why You Need Wadding . . .
I haven't seen this one for a while, it's worth a re-visit:
CLICK HERE
This is another video from Roger Smith - He explains:
"This video shows what happens inside a rocket when the ejection charge fires. Captured at 1200 frames-per-second, this high-speed video illustrates dramatically why you need recovery wadding (or some other system) to protect the rocket's parachute."
Roger has other videos to see: CLICK HERE
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WOW ....that's quite a bit of fire and heat......its a wonder plastic chutes work at all....
ReplyDeleteHi Metalhead,
DeleteI use plastic "parasheets" in about all of my LPR rockets and rarely see any melting. If you use a bit of a wadding wrap at the bottom:
http://modelrocketbuilding.blogspot.com/2014/11/wadding-wrap-tip.html
it helps quite a bit.
The weird thing is, I've had some shroud lines get hot and stick together preventing the parachute from fully opening!
I usually use #10 all cotton crochet thread now.
The static tests show quite a bit of thrust vectoring too....
ReplyDeleteI have had good luck so far with chutes.....gonna try dog barf one day
ReplyDeleteHi Metalhead,
DeleteI don't like the dog barf. It is cheap, but the pieces are very small and there is better chance for blow-by especially in larger tubes.
Some people wrap the dog barf in a piece of wadding so it blows out like a one-piece piston.