04-04-2022, 03:41 PM
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rocket dinosaur
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Join Date: Mar 2005
Location: My Old Kentucky Home
Posts: 1,184
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Quote:
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Originally Posted by tbzep
Are they using the typical zero volume piston that's been around since the 70's, or have they come up with something different in the fixed piston relm?
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it's basically the same design, Except now they have design upgrades like grooved teflon piston heads, some had pull pins to release a piston collar clamp, although that seems to have petered out. I never used a grooved teflon piston head but I may have been the 1st person to use a teflon piston head back at the Flyoffs at NARAM-47. Some use springs to absorb the piston head stop shock. A new feature is to use 10mm diameter piston tubes with a 13mm on top to fit the engine. Apogee Newsletter #428 has a good look at some Bulgarian and Ukrainian pistons.
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"Old Rocketeer's don't die; they just go OOP".....unless you 3D print them.
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