APS casing layout

[DabCat]

I've got a 38mm APS 5 or 6 grain (about same length as the 38/720) and I'm flying it on an EX load at BALLS next weekend. For those of you who fly these, what size are all the o-rings? Does anyone have a drawing of the proper layout? Thanks.

 

[jsdemar]

I've got a 38mm APS 5 or 6 grain (about same length as the 38/720) and I'm flying it on an EX load at BALLS next weekend. For those of you who fly these, what size are all the o-rings? Does anyone have a drawing of the proper layout? Thanks.

What is the ID of the case and the OD of the nozzle and closure?

I can put those numbers into my o-ring calculator spreadsheet or you can do it yourself. It's part of my 2021 Tratech presentation. Spreadsheet is here: https://tripoli.org/docs.ashx?id=927133

 

[DabCat]

What is the ID of the case and the OD of the nozzle and closure?

I can put those numbers into my o-ring calculator spreadsheet or you can do it yourself. It's part of my 2021 Tratech presentation. Spreadsheet is here: https://tripoli.org/docs.ashx?id=927133

It isn't a snap ring case. It's the purple ACME threaded case. I believe the case ID is the same as Loki, but I think the ID at the o-ring is different. I'd have to measure when I get home.

 

[jsdemar]

It isn't a snap ring case. It's the purple ACME threaded case. I believe the case ID is the same as Loki, but I think the ID at the o-ring is different. I'd have to measure when I get home.

The o-ring calculator isn't specific to snap-ring cases.

 

[ECayemberg]

I have used that hardware for Rx loads in the past. My Research notes tell me that I use a 122 Buna on the Nozzle and a 123 Buna on the forward bulkhead, with 113's around Aerotech HDK-22's for smoke/delay.