Relating to this subject...
I purchased a LOC/Precision Onyx a few months ago. The first flight engine
recommended was a D12. The thing barely flew, arced, and nearly nosed
in before the ejection charge went off. The D-engine recommended is NOT
Also, the parachute us MUCH too small for the load. Opened diameter is
< 10" and it broke a fin on first flight.
I've substituted the chute with an Aerotech Chute (around 16") and use
E engines. It flies great now and doesn't damage itself upon landing.
I wonder if LOC even tried this rocket with original chute, let alone, with
a D-engine. The combination just doesn't work.