Estes Orbital Transport, Kit #K-42, Part 2, Engine Mount

The engine mount is a standard 20/50 style. I'll be doing some minor upgrades.

The upper centering ring is glued above the upper bend of the engine nook so no notch is needed. I did cut a "V" shaped notch for a Kevlar tie.

The lower ring (upper left, the mount is shown upside down) got a notch for engine hook relief. It's not a deep notch, just as deep as the thickness of the flat hook.

150 lb. Kevlar is tied around the BT-20 tube. I usually use a square knot. The first overhand knot can open up so a little bit of wood glue is set on the top to hold it while the second (reversed) overhand knot is tied.

The inset picture on the right shows a glue fillet beneath the ring. The Kevlar line loop is pressed into the glue before it sets up.
 

Here's the finished engine mount.


I also added an engine block, a 5/20 ring. The original kit didn't have an engine block - Not a smart omission.