Temperature Data Request

Eyesinthesky · Jun 12, 2018

Hi,

Does anyone have temperature data that has been measured from a rocket in flight? I am looking for the temperature the outside of a motor mount tube can reach. This is not a supersonic flight so I'm not so concerned about aerodynamic affects but the temperature due to the motor burn. I'm specifically looking for a 54mm K motor. Thanks,

Doug

mikec · Jun 12, 2018

I believe HPR motors are required to stay below 220C case temperature by NFPA.

dhbarr · Jun 12, 2018

mikec said:
I believe HPR motors are required to stay below 220C case temperature by NFPA.

Specifically, NFPA 1125-2012-7.4.1

UhClem · Jun 12, 2018

mikec said:
I believe HPR motors are required to stay below 220C case temperature by NFPA.

Yes, but the test conditions aren't specified. Compare a motor run in a test stand with not even a motor mount tube around it to one in a motor mount tube. Or in a motor mount with an air gap to the surrounding airframe. Or worse, with the gap filled with polyurethane foam.

Each will produce a different temperature/time history.

tim cubbedge · Jun 12, 2018

Tony (tfish) did some testing. here is one of his videos.
[video]https://youtu.be/stO7DtJ68tU[/video]

mikec · Jun 12, 2018

UhClem said:
Each will produce a different temperature/time history.

Sure, but it was hard to tell how precisely the OP needed the answer. I doubt there's a huge difference between static firing and flight, and to the extent there is, one rocket may not be much like another anyway.

Eyesinthesky · Jun 13, 2018

timbucktoo said:
Tony (tfish) did some testing. here is one of his videos.
[video]https://youtu.be/stO7DtJ68tU[/video]

This is great info, Thanks. I'm wanting to mold a custom motor retainer and I think it is worth a try. The material I'm considering has a max temperature of 275F but it should be OK. Thanks again Tony and Tim.

Doug

OverTheTop · Jun 14, 2018

If I remember I will put some temperature tags on the outside of my motor casing when I fly this weekend. Will let you know the results ;-)

Temperature Data Request

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