Aerotech 38mm enlarged closure? - Northern Colorado Rocketry

This topic has 5 replies, 3 voices, and was last updated 13 years, 5 months ago by Warren B. Musselman.

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March 30, 2012 at 3:49 am #41480
bryans
I’ve had an AT 1080 casing for a while, but have never bothered to fly it. Now i have a mild case of minimum diameter, so I’ll throw a J570 at it.

I was actually looking at the instructions to see if it needed a different forward closure like the long-burn motors do, and i see this:

38mm enlarged aft closure

I dont know where this Rouse-tech motor originally came from, and all I have ever flown with AT 38mm is a bunch of I-284 (38/600), so I don’t know whether I have an “enlarged” one or not (damn this whole thing sounds like a viagra commercial).

Dimensional drawings on Aerotech’s web site all look the same, and do not have the nozzle opening diameter listed. Other instructions look the same, and of course the only motor i have on hand to look at is yet another I284.

Maybe only the inside area constitutes “enlarged”? See pic of how its machined.

Here’s pics … if someone has both kinds, could you kindly send a photo of both?

Outside:

Inside:

Profile:
March 31, 2012 at 10:27 pm #55811
Jeffrey Joe Hinton
Moderator
From the picture it looks as if you have what it takes. The previously issued and now outdated smaller aft closures have been pretty much eliminated from the offerrings. Didn’t really alter the performance of the motors, just made a better fit for the nozzles.
April 1, 2012 at 8:02 am #55813
bryans
Thanks Joe. I have Rouse-Tech casings with obviously (red) Dr. Rocket forward closures, and who knows what on the aft… so its a crap shoot as to when these were actually manufactured.

I had figured that at some point AT made a motor that needed a different nozzle design that wouldn’t fit the aft closure, and there begat the “enlarged” one. Come on HPR junkies, what year was it?!?!?

[ rain dance! ]
April 2, 2012 at 4:07 am #55814
Warren B. Musselman
Moderator
Don’t forget the seal disk and o-ring. It’s quite spectacular when you do.
April 4, 2012 at 5:08 am #55812
bryans
Yup, thanks Warren, I’m good and paranoid on that already.
April 5, 2012 at 8:38 pm #55815
Warren B. Musselman
Moderator
I only say that because one of my 5 L2 attempts failed because of a missing seal disk and o-ring… and I needed to buy a new case and forward closure because of it.
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