Semroc Snake Jumper Build, Part 2, Engine Mount Upgrades

This build will incorporate the new Odd'l Rockets heavy wall BT-20H, an extended length engine hook and replaceable Kevlar.

The BT-20H diameter is a bit wider than a standard BT-20. To make it fit the centering rings sand the inside hole edge with 220 grit sandpaper. Roll the sandpaper around your index finger and rotate around the inside hole. Sand a bit, check the fit and repeat until the tube slides in. It's easier than you think.

To prep the rings for the replaceable Kevlar mount -
Punch a small hole directly opposite the engine hook slot on both rings. A plastic tube from Dollar Store Q-tips will slide through both hole

To use the new eXtended Length Engine Hook (3" long) the BT-20H tube is cut to 3" long.

A notch is cut for the upper bend of the hook. Make the notch 1/4" from the top of the tube.

On the far right is a dry fit of the hook, tube and centering rings. Black electrical tape will wrap around the tube, over the hook and tube, centered between the centering rings.

Slide the engine block in from the bottom, no glue yet.
Use an standard engine casing to push the block forward until it ends up under the top bend of the hook.

A glue fillet is applied around the top of the engine block. You can leave the engine casing in place until the glue dries.

Using the XLEH (eXtended Length Engine Hook) places the engine block under the top bend of the hook preventing movement and tearing of the engine mount tube. The fit of the engine top is also better, not resting at a slight angle in the tube.