Quantcast

Anyone know of a recovery method other than Estes wadding?

The Rocketry Forum

Help Support The Rocketry Forum:

rocketsonly

Well-Known Member
Joined
Apr 7, 2004
Messages
877
Reaction score
0
Okay, so here's the deal, I'm a high school student working on a science fair project. I just spent most of my budget on an alitmeter, but now don't have money for recovery wadding. I've heard of using Kevlar or Nomex and conencting it to the shock cord. Anyone know where I can buy this stuff? Any other methods for blast protection?
-Matthew
 

teflonrocketry1

Well-Known Member
Joined
Jul 31, 2011
Messages
1,625
Reaction score
1
Make a body tube diameter wide "pom pom" out of Teflon Pipe Thread Sealant Tape and tie it to the shock cord for permanent wadding.

Bruce S. Levison, NAR #69055
 

Zippy

Well-Known Member
Joined
Oct 30, 2003
Messages
457
Reaction score
0
Lurk around a construction site and see if you can pick up some of the blown in cellulose insulation. It looks like ground up newspaper becouse thats what it is and its treated with firesuppresant. Lots of us use it. It might be in your attick as well. Don't use fiberglass insulation. Crepe paper also works.
 

wwattles

Well-Known Member
Joined
Jan 21, 2009
Messages
2,859
Reaction score
0
There are a large number of vendors that sell nomex blankets online. I'm sure some folks have their favorites - I buy mine from my local vendor, What's Up Hobbies.

You can also use what is known in construction as insulation foam, but what you'll hear referred to as "dog barf". It's a gray-colored cellulose that looks like packed lint. It's normally used for attic insulation, so look in that part of the store. A bale lasts forever and it's pretty cheap, too.

There was a discussion on here a few months ago, too, about using loose lettuce leafs for insulation, since they are cool, disposable, and biodegradable!

WW
 

Fishhead

Well-Known Member
Joined
Jan 20, 2009
Messages
3,307
Reaction score
41
Originally posted by Zippy
Lurk around a construction site and see if you can pick up some of the blown in cellulose insulation. It looks like ground up newspaper becouse thats what it is and its treated with firesuppresant. Lots of us use it. It might be in your attick as well. Don't use fiberglass insulation. Crepe paper also works.
No need to check construction sites. You can buy it cheap by the bale at Lowe's or Home Depot. More wadding than you'll use over the course of several seasons.
 

OKTurbo

Well-Known Member
TRF Supporter
Joined
Feb 20, 2009
Messages
1,519
Reaction score
334
Cellulose insulation is the way to go.

$6 at Lowe's gets you this much.
 

OKTurbo

Well-Known Member
TRF Supporter
Joined
Feb 20, 2009
Messages
1,519
Reaction score
334
A $6 bale should last a while :)

I put it into smaller ziploc bags to take to the field.
 

wwattles

Well-Known Member
Joined
Jan 21, 2009
Messages
2,859
Reaction score
0
My buddy has a large-ish container that he got some kitty litter in that he now uses to transport his dog barf. It looks like it's about 2 gallons or so in size, and it lasts about 5 or 6 launches with 4 of us using it, including HPR stuff that is 6" in diameter.

WW
 

Micromeister

Micro Craftman/ClusterNut
TRF Lifetime Supporter
TRF Supporter
Joined
Jan 19, 2009
Messages
15,074
Reaction score
38
Location
Washington DC
Matthew:
By far the Cheapest, easiest "permanent" flameproof wadding is 1/2" or 3/4" Teflon plumbers tape Pom-Poms as Bruce mentioned earlier.
I've been flying a single 30 - 12" strip pom-pom in my Super Starship Vega to protect one of my 24" nylon Hemi chute. havent' event scorched it in many flights. two or three of the same size pom-poms work in BT-80's also.
Hope this helps.
 

loopy

Well-Known Member
Joined
Dec 13, 2009
Messages
4,570
Reaction score
1
Dog Barf is good, or if you want the permanent idea, there's also the parachute protectors from Pratt hobbies. Great stuff.
 

rocketsonly

Well-Known Member
Joined
Apr 7, 2004
Messages
877
Reaction score
0
Okay, thanks for all the help you all. But does anyone have a picture of these Nomex pom poms? And what kind of retail store would sell Nomex? Army surplus stores?
-Matthew
 

rocketkid88

Well-Known Member
Joined
Sep 22, 2009
Messages
403
Reaction score
0
you could also try a piston, bafle, or cooling mesh. any of these should be cheap to make.. a search here on the forum should bring you many results on any of these. it also depends some on the size of your rocket.. you said you bought an altimiter, so i assume its rather big (at least not lpr). mabye a bafle would be the way to go?

*post nr 100!*
 

wwattles

Well-Known Member
Joined
Jan 21, 2009
Messages
2,859
Reaction score
0
Matthew,

The pom-poms are made from teflon tape. See this thread for the instructions on how to make them, courtesy of Mr. Teflon himself, teflonrocketry1. The post is about halfway down the first page.

Teflon tape is commonly used as pipe sealant tape, available at most hardware stores and some more complete drug stores (chemists for our UK friends).

Nomex is commonly used for firefighting clothing. I haven't tried this yet, but I've often considered stopping at our local fire station and asking if they have any worn-out firefighting clothes that I could take off their hands to cut into recovery items.

WW
 

rocketsonly

Well-Known Member
Joined
Apr 7, 2004
Messages
877
Reaction score
0
The baffle won't work because I'm only using 'B' and 'C' engines. I'll check out the teflon pom poms in a second. But one of my friend's dad said he would lend me 2 5x5 inch NOMEX heat shields.
-Matthew
 

BlueNinja

Well-Known Member
Joined
Jan 18, 2009
Messages
2,690
Reaction score
1
A baffle will work. My mongoose has one and I regurarly fly it on A motors.
 

rocketsonly

Well-Known Member
Joined
Apr 7, 2004
Messages
877
Reaction score
0
Darn, too late. I already calculated my CP and CG for each fin shape (long story)... So I can't change the recovery system now. Thanks for all the helpful tips guys (and gals!)!
-Matthew
 

Donaldsrockets

Well-Known Member
Joined
Jan 18, 2009
Messages
3,518
Reaction score
1
Location
Fort Myers, FL
I use a combination of Estes Wadding and dog barf. I usually use the Estes wadding in rockets with a body tube smaller than a BT-60.

For my BT-60 and larger birds, I use dog barf.

Hope this helps.
 
Top