Actually the original goal was to develop a high power reload for the RMS-29/40-120 Hobby Line case. AT came real close, but didn't quite make it, just not enough internal volume. The G138T develops 157.1 Ns with 70 grams of propellant. It needs about 6 Ns more propellant to be unambiguously listed as a H- motor.I think this load shows people really like full G motors. Stuffing one into a 120 case may not be the best way to provide that. I'd absolutely be down for getting new hardware if they released a 29/160 and 38/160 cases. Cut them to be under hazmat too...
Unlikely, but a boy can dream.
After looking at my two 29 mm x 40-120 cases;
There is some loss of dye to the anodizing at the forward end of the casing.
Each case has about 1 firing each.
The next time I load up one of these I'll be sure to reverse the case so the forward end is aft.
One possible fix might be to: either double up or glue the forward insulator in place to get a better gas seal.
JD
Not quite the same. The G138 is designed for the RMS-29/40-120 Hobbyline casing. Getting 160+ Ns into a 120 Ns model rocket motor casing wasn't possible.The H 238 isn't much more in the terms of Ns....
Coming in at 165 Ns.
The only real difference is that the G 138 is a single grain, hence the
HAZ-MAT requirements.
JD
Not quite the same. The G138 is designed for the RMS-29/40-120 Hobbyline casing. Getting 160+ Ns into a 120 Ns model rocket motor casing wasn't possible.
The H238 is designed for the larger RMS-29 High Power 29/180 casing. Getting 175 Ns in a 180 Ns casing isn't hard.
Bob
This is a liner less motor. As there is no liner, the casting tube is the defacto insulator/liner, and it is either not thick enough, or more likely not long enough to prevent hot gas impingement on the aluminum motor casing which is the only way you will blister the casing.Another option might be: to wrap AL Duct tape around the grain??
The good stuff is suppose to be good for 400 degrees F.
Hopefully my Wildman order isn't to far off either......
I have 6 of them on order.
JD
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