I95 SU motor

Can't find thrust curve info on this motor, AT I95 SU 38MM, thought it might be an I195 or or something similar, no luck.

That is not a motor I have heard of before.

So i purchased a fellow enthusiast casing and motors who was getting out of the hobby. He had been in it for 30 years at times taking a break, anyway this motor was in the collection including a few G33 reloads, quest Q2G2 igniters, and some other goodies. So i'd like to find out more about it, there's definitely propellant inside lol.

That is a motor from the early 90's. If I remember correctly , it should be around 450 ns .

Eric

Ps , burn it

How long is the casing?

3stoogesrocketry said:

That is a motor from the early 90's.

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1993. Should be a c-slot. Sometimes it's difficult to get an igniter to fit.

jsdemar said:

1993. Should be a c-slot. Sometimes it's difficult to get an igniter to fit.

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Here's the old ENG file thrust curve:

38mm x 235mm (9.25") long.

The complete ENG file from 1999 with many old AT SU motors is on archive.org from the wrasp.com website:
https://web.archive.org/web/20000819030709/https://www.wrasp.com:80/rasp.eng

Here's what the curve looks like. 405 N-sec motor.

Awesome, thanks for the info, i did search but just thrustcurve. I know what i'll eventually put it in too.

According to the date code on the motor, it was made 22 Mar 93. 5D = 93 and 142 = 322. These numbers were obtained by converting the two pieces from hexadecimal (base 16) to decimal (base 10). I believe Aerotech used this method of coding dates from about 1989 in 1998. If you want to use motor ejection, keep in mind that the delay will probably run a bit long (about 3+ second), but that was for 15-18 year motors and reloads.

That's great infomation, i would probably use motor ejection on the rocket i'm thinking of using it in. Wonder if the old BP could be dumped out and replaced with newer BP. Thank you!

ericm541 said:

That's great infomation, i would probably use motor ejection on the rocket i'm thinking of using it in. Wonder if the old BP could be dumped out and replaced with newer BP. Thank you!

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The BP is not the issue with the delays being longer- it is the delay grain burning slower.

My issue has nothing to do with the delay, just with BP in general if it's good after all the years, Not knowing how it was stored. The longer delay may work in my favor too.

As long as the BP is kept dry, it should work just fine. It is the AP-based parts of the motor that are really affected more by aging.