Will Nomex Burn ...

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SacEsq

SacEsq

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Yes ... yes it will. If you have a Big daddy cluster with a D12-5 and (4) C6-5.

BD.Burn.jpg
 
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ive seen holes burned into nomex that's why I use Kevlar protectors between a friend and I we have used Kevlar and only had a hole worn in after 100 + flights. they have taken some Heavy blackpowder hits
 
fyrwrxz said:
Alex- I'll take "recovery" for a hundred. Lessee, um, "D", packing it with a plunger-that's just silly. I'll go with...What is "A" dog barf?.
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???

I put the nomex between the motors and dog barf. Given the limited room for recovery gear I did not think the nomex alone or dog barf alone would be sufficient. Fortunately, even with the destroyed nomex the recovery harness and parachute were in perfect condition.

I guess I will try just the dog barf next time.
 
SacEsq said:
???

I put the nomex between the motors and dog barf. Given the limited room for recovery gear I did not think the nomex alone or dog barf alone would be sufficient. Fortunately, even with the destroyed nomex the recovery harness and parachute were in perfect condition.

I guess I will try just the dog barf next time.
Click to expand...
Dog barf UNDER the nomex may work better-saves the nomex and the blanket acts like a piston. YMMV.
 
Yep. Nomex is flame resistant, not fire proof or burn proof. It is meant to resist heat, such as that from a flash fire, for a short period of time AND act as an insulation to that heat. Direct impingement will cause it to burn.

So I wonder if it was only the clustering of engines and concentration of heat from all 5 ejection charges that did this? Instead, I could see all the ejection events occurring at slightly different times, and IF the first charge did not blow the laundry out, it would scorch the Nomex until some of the other ejection charges pitched-in to help finish the task (of burning the Nomex and ejecting the chute).
 
I know it is totally uncool with the real men kevlar/nomex fliers, but I use a dog barf sandwich on my D12 clusters where the rocket is like a cheap Hospital, no recovery room, Colored float paper squares, dog barf slightly packed:y:, then more float paper squares, The results are good but it looks like this at ejection:

image(3).jpg

They may ask what the heck you are using for wadding but at least your chutes are in tact.
 
Sorry about your nomex. I am launching a Cluster Duck this weekend, on six C6-0's and 1 E12-4, and I was planning on using a Nomex shield with barf. I will definitely use this lesson to pack the barf first. Want to protect this chute as this kit does not come with a chute and I ordered a really nice custom chute complete with the name of the rocket embroidered on it. Though only the E12-4 ejection charge actually will be going into the tube I will still be extra careful. The six c6-0's actually vent through vent holes out the side of their respective MMT's.
 
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RocketGeekInFL said:
Sorry about your nomex. I am launching a Cluster Duck this weekend, on six C6-0's and 1 E12-4, and I was planning on using a Nomex shield with barf. I will definitely use this lesson to pack the barf first. Want to protect this chute as this kit does not come with a chute and I ordered a really nice custom chute complete with the name of the rocket embroidered on it. Though only the E12-4 ejection charge actually will be going into the tube I will still be extra careful. The six c6-0's actually vent through vent holes out the side of their respective MMT's.
Click to expand...

Use the Dark Side of the Force and you will not need the vent holes or have to deal with the hibachi effect caused by uncapped C6-0's.:dark:
 
Also ... what if the C's light but your E does not ... OUCH
 
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oddmanrockets said:
ive seen holes burned into nomex that's why I use Kevlar protectors between a friend and I we have used Kevlar and only had a hole worn in after 100 + flights. they have taken some Heavy blackpowder hits
Click to expand...
Kevlar and Nomex are both aramids. Kevlar is synthesized by condensing p-Phenylenediamine monomer with Terephthaloyl chloride. Nomex is synthesized by condensing m-Phenylenediamine monomer with Isophthalic acid. Kevlar is stronger mechanically because its linear and more crystalline. Nomex is a better insulator and more flexible because is more S-shaped.

Both are about equally flame-resistant on the molecular level, however the number of fibers spun into the yarn and how the yarn is woven into fabric will effect the flame retardency.

Bob
 
Daddyisabar said:
I know it is totally uncool with the real men kevlar/nomex fliers, but I use a dog barf sandwich on my D12 clusters where the rocket is like a cheap Hospital, no recovery room, Colored float paper squares, dog barf slightly packed:y:, then more float paper squares, The results are good but it looks like this at ejection:

View attachment 160025

They may ask what the heck you are using for wadding but at least your chutes are in tact.
Click to expand...


Looks like your Stuka encountered Spitfires....
 
Hey Jason, is that blanket from Sunward? I have some, and they seem thinner and softer than the blankets I've gotten from Rocketchutes.com and Top Flight. I've never had any of them burn through, just get scorched a little.
 
I don't know where it came from but it does feel thinner (much more so especially now ;) ) than others I have.
 
I got some small nylon chutes from sunward. I think the lines were ripped off a few still in the package. They might be a step over plastic and the circle stickers, but not much. If the nomex is similar quality, I'm not surprised.
 
ROFL, when I saw this thread I knew instantly who posted this. You did a great job toasting that nomex. +1 on the idea of placing dog barf first, then nomex, finally parachute.
 
cavecentral said:
I got some small nylon chutes from sunward. I think the lines were ripped off a few still in the package. They might be a step over plastic and the circle stickers, but not much. If the nomex is similar quality, I'm not surprised.
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I've used the thin mil chutes from Sunward. They're definitely not as strong as regular nylon chutes, but I haven't had one fail.
 
qquake2k said:
I've used the thin mil chutes from Sunward. They're definitely not as strong as regular nylon chutes, but I haven't had one fail.
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Mine were bought of eBay. Maybe they were the worst of a batch. Like I said one didn't survive removal from the package. I can't remember if I tried one. If I did, the result did not help my opinion. I should look at / open the others. I think they are buried at the bottom of my chutes box.
 
Such confidence in heavy kevlar cord and nomex. But put 'em up against the awesome power of three shotgun ejection charges from the Mighty D's in a close and densely packed environment and they melt like butter. For frywrxz the Stuka has no TTW, just surface mount. The precious tube space is all motors, recovery gear and super high tech fireproofing (masking tape) for the short kevlar shock cord above the motor mount. My precious nomex blankies are saved for the high dollar High Power birds with good rocket science behind them. For crazy low power clusters the strain is just way too much. Too much heat in the kitchen. Better to sick with thin wall paper tubes, CA, underwear elastic, float paper and dog barf for extreme low power cluster flying.
 
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I ran into this with a Sunward from a 38mm motor--suspect it was because that brand's nomex is so thin. Retired that one, put dog barf between the ejection charge and subsequent uses... no problems since, even with heavy charges.


Later!

--Coop
 
The Big Daddy is very short. The Nomex pad sits right on top of the ejection charge. I know because we usually put an E9 in ours. Burns right through the Nomex. Will have to start using dog barf first, then pad. Have seen plenty of burn through on Nomex pads on other low power rockets that are much longer than Big Daddy. I always use Kevlar pads from GLR for hpr, never had a burn through. Would be interesting to try one in a Big Daddy just for comparison.
 
Make sure the shot gun charge does not just blow by the dog barf and burn the lovely nomex. It is all about good packing technique. The dog barf or paper wadding below the blankie also needs to act as a piston in a cramped space with multiple charges going off at varying times with in a second.

Be sure to stand off the rocket from the blast deflector and angle the blast deflector to avoid a$$ burn on take off.

I bring home some silly BP cluster rockets and have to clean them up before bringing them in the house because the wife says they stink. But I love the smell of soot and burned paper & glue on clean up, it smells like fun!
 
cavecentral said:
Mine were bought of eBay. Maybe they were the worst of a batch. Like I said one didn't survive removal from the package. I can't remember if I tried one. If I did, the result did not help my opinion. I should look at / open the others. I think they are buried at the bottom of my chutes box.
Click to expand...

This is one of them. It's a 36", I believe.

IMGP2787.JPG

IMGP2793.JPG
 
Mine are maybe 12" or 18". Low end of the spectrum. Same yellow, but the line attachment is terrible.
 
I use GLR kevlar pads on my Sumo and G-Force too. Barely a sign of any scorching. Chutes are happy!
 

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