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**Lets talk (Wren) Turbines..**

http://www.wren-turbines.com/specifi.htm

How would you convert 81 Newtons Thrust output to power output in watts ??

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- Thread starter willib
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http://www.wren-turbines.com/specifi.htm

How would you convert 81 Newtons Thrust output to power output in watts ??

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FredGarvin

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These Wren turbines are just under three inches in diameter..

very cool stuff..

very cool stuff..

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Q_Goest

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So there doesn't seem to be a correlation between hp and thrust. But there should be since the power actually equates to energy in (ie: energy burned in the engine).

I always wondered about this one, how can you equate thrust to hp? Perhaps because it's "static thrust" one must be able to get a "thrust curve" which is analogous to a pressure curve on a centrifugal pump, along with an efficiency.

There has to be more to it than simply thrust at 375 mph equates to a given hp.

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FredGarvin

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Q_Goest said:

So there doesn't seem to be a correlation between hp and thrust. But there should be since the power actually equates to energy in (ie: energy burned in the engine).

I always wondered about this one, how can you equate thrust to hp? Perhaps because it's "static thrust" one must be able to get a "thrust curve" which is analogous to a pressure curve on a centrifugal pump, along with an efficiency.

There has to be more to it than simply thrust at 375 mph equates to a given hp.

You do bring up good points. Personally I have NEVER expressed a thrust producing engine in terms of horsepower. It is always in thrust. For some (unknown to me) reason there is a small need to express HP in this fashion. The relationship [tex] THP = \frac{F_n * MPH}{375}[/tex] is actually from a Pratt and Whitney reference I have. It is the only reference I have that even states it. What it's method of derivation is I really do not know.

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Oops my mistake..

please disregard..

please disregard..

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Danger

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As I understand it, hp:thrust ratio depends on not only speed, but also altitude. I assume that it has something to do with factoring in air resistance.FredGarvin said:The relationship [tex] THP = \frac{F_n * MPH}{375}[/tex] is actually from a Pratt and Whitney reference I have. It is the only reference I have that even states it. What it's method of derivation is I really do not know.

It always bugs me that a full-throttle jet bolted to a test stand produces

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