The tri-fold may be "passé" but, when used with kevlar, works just fine in small tubes.

Kevlar around the thrust ring works great for awhile....but somewhere between 10 and 20 flights it is going to fail from being cooked by ejection charges. Been there, done that. Kevlar in a tri-fold in the usual place below the nose cone is immune to this problem.

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Bernard Cawley
NAR 89040 L1 - Life Member
SAM 0061
AMA 42160
KG7AIE