On this thread on TRF, Gary Rosenfield has released some more information about the possibility of 24mm Gs.
He confirms they'd be for 24/120 hardware, which would presumably be a 2-grain configuration. According to the 24/60 assembly drawing helpfully located in the 'resources' section on the Aerotech website, the fuel grains in the 24/60 case are 2.85" long, hence the 24/120 case would be 7.2 (=2.85+4.35) inches long, including the forward closure but not the aft closure.
He also confirms that they're working on other loads for the 24/60, including Redlines. This makes the EGE very very happy. The fact that he says loads, plural, prolly indicates a Black Jack and/or Blue Thunder load in the works.
He says that the single G load currently in the works will be a core-burner, because a C-slot grain would require either a thicker paper liner or phenolic liner, which would be more expensive. Also, for multi-grain motors, aligning the slots requires taping the grain together - an extra step that if forgotten would likely prevent proper ignition of the motor, certainly result in a strange thrust pattern with a much higher initial spike, and possibly cause a CATO.
He also mentions that because it would be a core burner, it would prolly be over 80N average thrust, making it a High Power motor instead of a Model Rocket motor, which may or may not be allowed at the Salem field I usually launch at.
Launch Report 2017-2 - LDRS-36
3 weeks ago