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Dec 18

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KeyHole Core(Slotted-Core)

First production produced a mandrel with a 5/8” center core and a 1/8” slot extending to the casting wall. 54mm geometry in the J-K class.

Specially designed aligning caps are to be produced to fit the mandrels.

Objective
Maximum inital thrust w/ a neutral long burn, reducing casting wall exposure compared to full offset.

Some sims show a regressive trailing w/ a single grain. A bates grain could more neutral.

Test 1 Geometry
54mm 1G 10”L using .625” core w/ 0.125” thick x 0.570” wide slotted core, 0.485 nozzle throat. Slot is extended to casting wall.
Kn= 191/217.

Test 2 Geometry
54mm 2G 5”L using .625” core w/ 0.125” thick x 0.570” wide slotted core, 0.485 nozzle throat. Slot is extended to casting wall. Grain slots lined up to each other.
Kn= 213/215.

Test 3 Geometry
54mm 2G 5”L using .625” core w/ 0.125” thick x 0.570” wide slotted core, 0.485 nozzle throat. Slot is extended to casting wall. Grain slots turned parallel to each other.
Kn= 213/215. More regressive?

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