Any R+D into nozzle throat length? It's effects, if any?

Bryan S Snyder · Apr 3, 2019

I've been thinking about what could, would happen differently, if anything if the nozzle throat was lengthen beyond what is the typical "normal".

Anyone know of any experimentation that's been done in this?

jsdemar · Apr 3, 2019

Departures from Ideal Performance for Conical Nozzles and Bell Nozzles, Straight-Cut Throats and Rounded Throats

Departures from Ideal Performance for Conical Nozzles and Bell Nozzles, Straight-Cut Throats and Rounded Throats, by Charles E. Rogers, High Power Rocketry magazine, Vol. 35, No. 7, October 2004, pages 24-54, and Vol. 35, No. 8, November 2004, pages 14-35.

https://rasaero.com/dloads/Departures from Ideal Performance.pdf

G_T · Apr 6, 2019

The throat on most commercial nozzles (aka "normal") is already too long for best performance. Read the reference John posted.

Gerald

Knuckledragger · Apr 8, 2019

Hmmm. Regrind my drill bit down from 60 degrees and make a couple of turns to shorten the length of the throat?

Any R+D into nozzle throat length? It's effects, if any?

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Bryan S Snyder

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Any R+D into nozzle throat length? It's effects, if any?

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Bryan S Snyder

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