Hybrid construction question

Apr 05, 2005 2 Replies
K

I'm scratch-building my L1 certification rocket, to be launched on a SkyRipper H155. In reading up on hybrid motors in general, it seems that boil-off from the motor tank is a problem that affects both fill time and (potentially) performance.



Is there any benefit to adding insulation to the tank area during construction? Adding a layer of Ensolite (outside the motor mount) would be easy, and add little weight... but is there any point in doing so? More significantly, is there some reason this would be a bad idea?



TIA for any thoughts.



Kevin OClassen NAR 13578


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A

I don't think insulation helps that much. Up to launch you are venting N2O through the vent tube because that is the path of least resistance. Once the motor has started and the fill tube burns through the path of least resistance is through the orifice to the combustion chamber.

Good practice is to keep your flight tank (motor tank) cold before you put it > I'm scratch-building my L1 certification rocket, to be launched on

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J

This should be in the FAQ.

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