Sorry John I don't have an AMW case to check but I think you may want to clarify what you are asking for since there are a couple of different manufactures that make spring rings with different cross widths in which AMW used at least two different ones and second that you want the OD of the actual spring ring groove and the OD of the ring when it is installed since the ID and OD of the spring ring will change once it is installed hence the name "spring" ring. Just wanted to let you know in case you are trying to do some special motor retention with tight clearances.

Mike, indeed you are correct. I talked to the good folks at www.smalley.com today and have some samples coming... will keep y'all posted.

I was a bit stunned when all my good work seemed to be for naught as the stock ring hung *way* out into the airstream. One of two things must now transpire:

a.) one of the candidates www.smalley.com is sending will work

b.) I have to grind a stock one down

The latter is not good, insomuch as the strength, etc. can be modified. Hopefully something will be in stock and I can use that?

So what about just taking the thrust ring out totally and doing a bulkhead with all thread and just screw the motor in with a wrap of tape to help hold it in place?

Mike, I am using the motor as a coupler 🙂 similar to my H and I rockets (if you have ever seen them up close?) so I can't do as you suggest...

Just a thought, but yes...I remember now. Still cleaning dirt out from between the ears if you know what I mean.

Mike, I hung around for SPONGE BOB and it was worth the wait! Very, very nice. I'd say it was in the top 1-3 flights of the entire event? JS's L3 with the M650 was very cool, too... you get extra credit for EX and all those airstarts. Both shots were epic blasts...

Okay, Im guessing you want the thrust ring so your motor doesn't fly through your rocket. I would suggest taking the thrust ring off, and putting a two inch coupler piece glued in right above the motor so it cant go up and the motor will sit right behind it. With that much service area the motor will stay put.

Mike, I hung around for SPONGE BOB and it was worth the wait! Very, very nice. I'd say it was in the top 1-3 flights of the entire event? JS's L3 with the M650 was very cool, too... you get extra credit for EX and all those airstarts. Both shots were epic blasts...

YES!!!!!

Mike, I hung around for SPONGE BOB and it was worth the wait! Very, very nice. I'd say it was in the top 1-3 flights of the entire event? JS's L3 with the M650 was very cool, too... you get extra credit for EX and all those airstarts. Both shots were epic blasts...

Why thank you John, thanks for sticking around and delaying your trip back home just to watch SB. I was a little more unprepared than I thought so it took a bit longer to prep. My wife kept having to tell me to slow down since I was so nervous.

Good luck on your thrust ring quest.

Well, the good folks at Smalley were unable to help... the OD of the rings is too great.

Now I must try to grind one down enough (but not too much). Hmmm....

John, the split rings used by Skyripper hybrids are somewhat less than half the exposure of the AMW rings - also a bit lighter and thinner. I don't know where they get theirs but that would be where I'd look.

Warren

The Skyripper rings come from Smalley.com. They are a custom run that Todd does. He doesn't have them for 75mm as there isn't a 75mm line yet. I know there are a few floating around in the club from the 54mm Skyripper line.

Edward

FWIW, Smalley would do a run for this use.... but it was going to be $350 to set up and then they'd do a bunch of them for nothing. The cost is all in the setup. One would cost as many as a hundred.

I'm going to go by a machine shop tomorrow and see if they can grind the standard one, or otherwise offer some suggestions.

JW

If it's any help, I'd buy a few if you end up having to have them made.

Warren