RunRyder RC Helicopter Topic - What is the relationship between HorsePower and AUW ?

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Aerial Photography and Video > What is the relationship between HorsePower and AUW ?

Hamed.A
New Heliman
Location: Malaysia

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Hi . Is there any relationship between engine's HP and AUW ? I mean How can I guess the AUW if I know engine's HP ?

11-05-2009 10:10 AM

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lele
Veteran
Location: italy

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Hi Hamed, I do not have an answer to your question..but I think that it is not only a matter of direct relation between HP and weight, there must be some importance even in the rotor disc (size, blade profile ecc.) those factors can vary the power need for a given weight.

Lele

11-05-2009 10:44 AM

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Hamed.A
New Heliman
Location: Malaysia

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Hi Lele and thanks for your answer. I don't want very accurate formula . I only need even very experimental formula or "Trial and error" formula for this purpose .

Thanks anyway.

11-05-2009 05:17 PM

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SeismicCWave
Veteran
Location: Hilo, Hawaii

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Don't ask me where it came from but the number 300 watts per pound is stuck in me head.

11-05-2009 05:23 PM

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nooobs
Elite Veteran
Location: Toronto, Canada

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300 watts per pound?

I'm averaging 59 watts per pound at 24lb AUW.

11-05-2009 06:03 PM

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Makiedog
Senior Heliman
Location: Minneapolis

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50 to 70 watts/lb is the generally accepted target. 50 being super efficient.

Pat L

11-05-2009 06:17 PM

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PhotoShip One
rrAdvertiser
Location: Arizona & Taiwan

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keep in mind the 50-70 watts per pound is a number for electrics. IC engines do not have the same torque curve as electrics. Remember, HP is a function of RPM and Torque.

Where:

P = Power, hp
N = Rotational shaft speed, rpm
T = Torque, lb-ft

Better to correlate aircraft gross weight with rotor blade disc diameter.

Design Team - PhotoShipOne

11-05-2009 06:30 PM

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SeismicCWave
Veteran
Location: Hilo, Hawaii

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I thought the 50 watts per pound was for electric fixed wing planes. I did say it was from the top of my head.