ThirstyBarbarian
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Speaking of E16 and F15, are the AT economax motors, say G74 series, a resonable step up in thrust for about the same $ if extra Ns are needed? Regardless, I do like the F15s in the Prowler with a booster fitted...
If you want single-use alternatives to the F15, then the next step up are the EconoJet F20, F23, f27, and F42. They actually have about the same total impulse as the F15, around 50 Ns. But they have higher thrust, so you can fly faster, or you can fly a heavier rocket. I like flying the bigger PSII builder kits on these when I'm at my club's low power field where they have a 1,000 foot ceiling. The PSII E2X kits, like the Ascender, would probably go well over 1,000 feet on these.
Next up are Aerotech single-use F motors that have higher Ns --- F26 has just over 60 Ns, and F25 has just under 80, which makes it a big F.
Over 80 Ns, you are into G motor range. The Economax G74 is just barely a G, with about 83 Ns. It has way more thrust than the F25, but not a whole lot more total impulse. And then there are all the other Aerotech single use G motors that are in the middle of the G range G40, G77, G78, G79, G80, etc.
Lots of choices for different rockets, different fields, and different propellant types!