UPGRADE: I changed out the standard BT-50 engine tube for a heavy wall BT-50H tube. I never thought the BT-50 tubing was very strong, especially when you are using 24mm and composite engines.
This required me to widen the center hole in the centering rings. It's easy to do with a 24mm engine casing and some 220 grit sandpaper.
1/4" of the engine tube is exposed out the back of the engine mount. I filled the body tube seam.
The Kevlar line is tied around the upper end of the engine tube. The end goes through the notch in the upper centering ring.
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