xx 98mm EX snap ring casings

[DeeRoc29]

I'm doing a run of 98mm/3.50" ID snap ring motor cases. Not anodized. All my cases are machined from 6061-T6511 ASTMB221 tubing hand selected for consistent ID. I've been using this tubing for years with success. All cases will include a heavy duty spiral thrust ring and two internal snap rings. Double snap ring grooves are available and recommended if you are running longer motors at >800 psi ($20 extra). Cases will be shipped securely in a 5x5" box via USPS 2-3 day priority mail with insurance. Buyer pays actual shipping. If you would like to purchase a case, please send me a DM telling me with case desired, your mailing address, and your Paypal address so that I can send you a payment request that reflects an accurate shipping quote. Turnaround time is 4-6 weeks.

~ Derek TRA#3406L3

98mm/3.50" ID snap ring 6061-T6511
Case length/price
24" 200
30" 225
48" 375
60" 475

 

[alexzogh]

I'm interested.... Most of my 98mm liners are 3.625 OD though....

 

[DeeRoc29]

3.625" OD liners are used on threaded AT/CTI cases. Snap ring cases are thicker walled, thus the 3.50" ID.

 

[alexzogh]

I see Loki sells compatible liners. Would be nice to stop risking my 'certified' hardware. PM incoming.

 

[jbr]

do you do a full turndown of the OD?
if so, the last 3/4" can be left as a thrust ring and no extra external ring is needed?

 

[AdAstraPerAspera]

For liners and casting tubes:

https://alwaysreadyrocketry.com/product-category/research-supplies/
https://lokiresearch.com/secure/store.asp?groupid=6112003225363
There may be other sources as well.

 

[DeeRoc29]

do you do a full turndown of the OD?
if so, the last 3/4" can be left as a thrust ring and no extra external ring is needed?

Correct. There is a built in thrust ring (4.00" OD) on the aft end. The external spiral retaining ring is included but can be removed if desired.

 

[Walldiver7]

do you do a full turndown of the OD?
if so, the last 3/4" can be left as a thrust ring and no extra external ring is needed?

Or the last 1/2" .... and then it fits just like AT/CTI hardware.

 

[DeeRoc29]

I'm going from memory right now but I think AMW is 3/4" width. I can do 1/2" too. Just let me know.

 

[jbr]

you should offer a 54", it uses a full 48" liner

 

[DeeRoc29]

I can make any length you want. The cases listed are a quick reference for price. A 54" case is $425.

 

[AdAstraPerAspera]

Is the double snap ring just an extra wide grove for two rings?

 

[DeeRoc29]

Correct. Optional. I don't usually do this but some have requested it. Ed Romani used to offer this on his cases when TruCore Brand X motors were still being made.

 

[AdAstraPerAspera]

Correct. Optional. I don't usually do this but some have requested it. Ed Romani used to offer this on his cases when TruCore Brand X motors were still being made.

Okay, thanks. I hadn't heard of that before...

 

[DeeRoc29]

Some have asked if i can make complete motors, but I'm not offering internal parts right now. But check out XPS Rocketry's killer deal on forward bulkhead closures.

 

[DeeRoc29]

Dropping off stock at the machinist Saturday morning. If you want a case from this run, let me know by Friday night.

 

[Conway Stevens]

Interested. Just the cases? Costs on sizes listed?

 

[DeeRoc29]

Cases only. Prices on a few sizes are listed in the post 1. PM for other sizes.

 

[Dave A]

I'm interested.... Most of my 98mm liners are 3.625 OD though....

If you can find any Kosdon 4" cases they'll work with the liners you have.
I have a 36" of Frank's. What I did know is the OD is slightly larger than the 4" motor tubes or the afore mention 98mm cases.
I made a custom tube for my last Patriot build. I made an adapter to go down to 75mm motors.
I fly EX motors and AT 98mm grains in it. When I flew the M1939, I used a AT nozzle, CTI nozzle carrier, Fwd and 75mm hubcap with a hardened adapter washer.

 

[DeeRoc29]

Posting here as a heads up. I will be doing another run of 98 and 75mm snap ring cases here shortly. I now offer black anodizing. Look for a new thread with updated info soon. If you want a custom case, shoot me a PM.

 

[jd2cylman]

I might be interested in a couple of 75mm cases.

 

[jmasterj]

What's the ID on the 75mm?

 

[DeeRoc29]

2.75 ID. Same as every other 75 case out there.