Not yet. I actually want to save those for testing out in a contest sized C Rocket Glider. The contest model boost is ALWAYS scary-hot and fast, so those C3/C4's should make it a lot more reasonable. And also should boost somewhat higher too, since a relatively draggy model is more efficient on a lower thrust engine (long as it keeps pointing up). That Quest engine would have to be a "C2" for me to be able to boost the 2X by piloting rather than rolling it on boost (the 4X Space Plane is a pussycat when boosting on a G12. But if I boosted it on a G40, and the wings did not rip off as they 100% for sure would, it would be a nightmare to boost it by R/C).

- George