Usually any model I build over two feet either gets a 18mm cluster or a 24mm D engine upgrade.
I've had great flights with my Quest Aerospace One with D engines, this model is about the same size. It'll get a D engine in a reinforced engine mount.
If you are careful you can cut the kit centering rings for the wider BT-50 engine mount tube.
Center a 2 3/4" long BT-50 over the kit's 18mm/35mm centering ring and trace around the tube.
Check to be sure the drawn ring is centered, if not center and trace again.
Use a new blade to carefully cut out the center.
I tend to cut just inside the pencil line for a tight fit.
The Quest rings can de-laminate when cutting. Make a few lighter passes with the blade as opposed to one hard cut.
This mount will also get a replaceable Kevlar line.
On the left is the hollow generic Q-tip shaft. The centering rings were punched with a rotary punch.
Directly opposite the Kevlar tube punch are two more punches for engine hook relief (top) and movement (below).
On the far right is a homemade engine hook bent from the interior spine of an old windshield wiper.
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