Quest Cobalt Clone Build Part 5 Engine Block

When using the Odd'l Rockets EXEH, the engine block (or thrust ring) goes under the top bend of the 3" long hook.

You do have to use a 1/4" long engine block. The EXEH hook is 3" long. With a 1/4" engine block ring below the upper bend of the hook, that leaves 2 3/4" for a standard 18mm engine.

Start the engine block into the tube from the bottom - no glue yet!

Raise the lower end of the hook and set the engine block into the motor mount tube. Slide the block into position with an engine casing.

If you used a 1/4" engine block the engine casing will lock under the lower bent hook end.

The EXEH extended engine hook puts the engine block under the top bend of the engine hook. The engine is more securely locked in place. There is no chance of tearing or enlargement of the engine hook slit if you have a "Shotgun" ejection.

The engine hook won't be loose and wiggling after 3 or four flights in a thinner BT-20 motor mount tube.

With the engine casing still in place, now apply a fillet around just the top of the engine block / motor tube joint.

With the casing left in place while the glue dries, the engine block will be "square in the tube. The isn't any glue near the casing, it should slide out easily after the fillet dries.