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Old 01-14-2009 | 08:02 PM
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wjcalhoun
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From: League City, TX
Default Thrust to weight

Folks:
Please indulge what is probably an uninformed question.

Is there a nomogram, formula, or rule of thumb for determining the likely thrust generated by a given engine (torque / hp) and propeller (dia / pitch / blades) combination?

I'm asking because I would like to be able to size an engine / prop to an airframe for a given purpose. For 3D, obviously thrust:weight must be >1; for other flight paradigms, that might not be necessary, and could be disadvantageous (taildragger trainer, for example. It would help me select a proper powerplant if I had something other than the 1hp/lb rule.

Thanks in advance for answers, tips, suggestions, or links.