Thank you. Maybe I will move BRS forward by only few inches to get some small benefits. One of them is moving CG forward. To have 3 inches between the rocket and radiator will give me opportunity to have small but nice looking logical cooling intake. It definitely started to feel like it is too much effort and risk for questionable benefits. I will think about it. But thank you for waking me up!And their situation is much worse than that. For a given "flat plate" drag area, doubling the airspeed results in 4 times the drag (force). And, making that force requires much more power at higher airspeeds.