Senior Space Cadet
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I'm playing around with some low altitude designs, while I wait for them to retract the launch prohibition.
I was designing a couple rockets with BT-80 bodies and 18mm motors. No boat tail.
I was wondering if the aerodynamics would be better if I had the aft centering ring right near the back edge of the body tube or would it be better to recess the engine so that the exhaust cone from the motor nearly fills up the void? Recessing the motor would also move the CG forward, allowing a shorter body tube which also reduces drag. Obviously, if I recessed it too far, I'd burn the back edge of the body tube.
With a BT-80 body tube I should still have room to reach in and install motors.
I was designing a couple rockets with BT-80 bodies and 18mm motors. No boat tail.
I was wondering if the aerodynamics would be better if I had the aft centering ring right near the back edge of the body tube or would it be better to recess the engine so that the exhaust cone from the motor nearly fills up the void? Recessing the motor would also move the CG forward, allowing a shorter body tube which also reduces drag. Obviously, if I recessed it too far, I'd burn the back edge of the body tube.
With a BT-80 body tube I should still have room to reach in and install motors.