This kit uses the standard tri-fold shock cord mount. That method works okay, but could obstruct the parachute at ejection especially in smaller diameter body tubes.
I upgraded to Kevlar and an elastic shock cord.
A small hole was drill through the upper adapter ring.
135 lb. Kelvar was fed through the hole and tied beneath the upper adapter ring. A glue fillet was added over the Kevlar.The picture shows the completed engine mount with the Kevlar tied on.
Be sure you check which end the engine block is glued in before drilling and tying on the Kevlar!
TIP: Another reason for not using a Tri-Fold shock cord mount:
If the spiral wraps on the inside of the body tube aren't tight or the seams close, the white glue on the back side of the mount can distort the tube!
If you look close at the Mars Snooper I just finished, you can see where the white glue got into the inside seam and it shows on the outside of the tube!
With thick rings like this, I cut a notch on the outside of the ring for the Kevlar. This keeps it just a little bit further from the heat of the ejection charge.
ReplyDeleteHi Chris,
DeleteI have done both, the Kevlar at the middle and to the outside of a wider centering ring. I also do my replaceable Kevlar line which allows you to check the line and replace it if needed.