Clearly you don't understand the concept of "the speed of foam"
In addition in reality long burn with large wings gives more altitude as drag at high boost speeds with a large wing is rediculous. Plus these are large and light which means their mass doesn't carry them far in coast even if you get the higher speed.
Boost speed and flutter are a real problem, G-25 reload might be ok, but it's an ounce heavier, so my overall weight would be about 1.6 ounces heavier, cg shift might be ok. the longburn G-12 single use Gary has been trying to get certified would be perfect, still same boost speed but an extra 4 seconds of burntime.
Here is a similar sized X-15 I did boosting on a G-40, however it weighed an extra 11 ounces more and even so this was a pretty fast boost speed if you are trying to control it.
https://youtu.be/grpnfTewUmw
Second is what happens in a large model when you mix light weight and a G-40 with too long a wingspan..
https://youtu.be/mOhngbhZDWI
The killers of tail mounted rocket gliders are tail weight and CG shift, so just sticking a bigger motor is not the answer in almost every case.
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Originally Posted by ghrocketman
You need more kick than a G12.
Try at least a plugged G76G or how bout a G138T; thaty'll give you a real afterburner-power boost.
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