Very cool! Is it just me or does the engine mount look very fragile compared to the engine and test stand? Thankfully there was not a whole lot of oscilation but I would have been worried about the engine snapping off. Essentially it looks like the engine is mounted only on the fuel feed? Will the mounting in the vehicle be the same way?
Sander
It is a 3/4" high sttength bolt holding it on, but going through the 1" 90 degree fitting and up through the load cell does give it a bit of lever arm, and even though it is sunk in reinforced concrete, the test stand does bend a little. We are probably going to box the sides of the stand for additional rigidity.
It doesn't help that the nozzle is very overexpanded at this pressure -- it is a 4:1 nozzle, which is only fully expanded around 350 psi chamber, quite a ways from the 145 or so we were running at.
The vehicle engines all have flat tops and are mounted directly to major structure, there won't be any bending at all there.
John Carmack
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