For those with limited machining abilities (if you don't have access to a
lathe).
My friend made a 98mm for his M-impulse KNSB motor. Worked great.
and we did the same for our 12" motor with ~2,000 pounds of thrust for 18
seconds...twice and ready for a third firing.
Here's one source: Stainless Steel Butt-Weld Concentric Reducers | Sanitary
Fittings
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Stainless Steel Butt-Weld Concentric Reducers | Sanitary Fittings
FREE SHIPPING on all orders over $100. Butt-Weld Polished Concentric Reducers
(31W) available for purchase onlin...
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