"Baby J, 29mm J500 in a 29mm case"

[PayLoad]

T-minus 4 hours & counting

 

[tim cubbedge]

Show us!

 

[Walter Longburn]

Do we get to watch it live? I hope it's a success!

 

[DAllen]

T-minus 4 hours & counting

Ok you can't just tease us like this and not provide more information lol

 

[mo2872]

Ok you can't just tease us like this and not provide more information lol

Try here....but he must have upped it from an I90....

https://www.rocketryforum.com/threads/how-to-get-a-motor-certified.164947/post-2109121

 

[PayLoad]

Try here....but he must have upped it from an I90....

https://www.rocketryforum.com/threads/how-to-get-a-motor-certified.164947/post-2109121

Same case, different grain & nozzle. My "film Crew" decided they had dates last night & could not film, doing this today, or everyone loses their iPads!

 

[PayLoad]

I think I'll stick with the I90



Upper bulkhead fail - CATO

 

[PayLoad]

Yeah, the motor itself blew out of the stand (200 feet away), leaving the grain on the ground. Poor upper bulkhead fastening which I will address.

 

[3stoogesrocketry]

What's the style of retention? Can you share your designs ( no recipes ) for both motors ? Do I see two independent fuel compositions?

 

[eggplant]

Yeah, the motor itself blew out of the stand (200 feet away), leaving the grain on the ground. Poor upper bulkhead fastening which I will address.

The person holding the camera is clearly well under 50' away.

 

[PayLoad]

Retention is currently by snap ring- Looking at the motor tube, you can see where it ripped right thru it. There are multiple fuel comps per motor - I have something I want to try with the Baby J before I give up - It was a simple bulkhead failure.

 

[PayLoad]

The person holding the camera is clearly well under 50' away.

Dad?

 

[3stoogesrocketry]

Retention is currently by snap ring- Looking at the motor tube, you can see where it ripped right thru it. There are multiple fuel comps per motor - I have something I want to try with the Baby J before I give up - It was a simple bulkhead failure.

Simple failure at 2k+ Pc is not just a bulkhead failure . Its a design issue that open motor or burnsim will not flag. What was your Kn 350/375? Shearing a case at the snap ring grove takes serious pressure .

 

[PayLoad]

I think I'll stick with the I90



Upper bulkhead fail - CATO

I meant for it to do that.......

 

[CPUTommy]

Please.. DO NOT GIVE UP!!

I WANT !!!

after crashing $1,000 I layed in bed and watched Nova "RISE OF THE ROCKETS"

31:00 -34:00. Rocketry made simple..



I

 

[PayLoad]

Hellfire Baby "J" 1600 coming up - will start new thread. 24mm J 1600

 

[CalebJ]

How long is the 24mm J case??

 

[PayLoad]

28 inches

 

[CalebJ]

Not bad - shorter than I was expecting for sure.

 

[3stoogesrocketry]

How long is the 24mm J case??

28 inches

Interesting , Franks 25mm motors that used 16 inches of fuel came in just a touch over 300ns.

 

[Orien]

I think I'll stick with the I90



Upper bulkhead fail - CATO

This is backyard rocketry at it's finest. A shed, a trampoline, and a motor test stand. An explosion rocks the neighborhood. Fiery propellent spews everywhere. But it's in the snow and who gives a ****. Certainly not the guy casually smoking a cigarette 20 feet away. 'Murica!!

 

[Walter Longburn]

24mm J 1600

Is it actually 24mm or did you mean to say 29mm?

 

[PayLoad]

29, sorry