|New fleet members (Click to enlarge).|
|Generic motor mount assembly instructions (Click to enlarge).|
A quick tip on the Generic - the motor mount slides into the fin unit, and is held in place by a thick cardboard coupler in the front and a small thin cardboard centering ring on the motor tube (which also holds the motor hook in place). This is good enough to keep the mount from sliding back and forth, but there is a fairly wide gap between the motor tube and the inner wall of the fin unit - which makes it easy for the motor tube to be tilted with respect to the rocket centerline. To prevent this, glue a split BT20/50 centering ring even with the rear of the motor tube, which makes a snug fit in the back. Adds a little weight, but the motor tube will be held straight, eliminating off axis thrust.
You can get split BT20/50 centering rings from eRockets here: AR-2050S
Or you could cut them yourself - I'm kinda lazy, so I buy them precut.