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Aerodynamics question CPL H

  • Vinny
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Vinny created the topic: Aerodynamics question CPL H

Hi Boys and Gals,

I have a question for you and I was wondering whether you could give me a hand. I have an Aerodynamic exam this Tuesday and for some reason I can not get this question right.

Questions: Helicopter rotor diameter is 35ft, it is operating at 2600 lb AUW (AUW???). The approximate disc loading is -

Answer: 2.6lb/sq st

As far as I know, this type of question we use the following formula: DISK LOAD = GROSS WEIGHT / DISK AREA.

I dont remember if there is another formula for this type of question or not. Sorry if this is a dumb question!

Any help is much appreciate.

Cheers,

Vinny
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bobtait replied the topic: Aerodynamics question CPL H

The disk area would be the area of the circle transcribed by the rotor blades. That would be pi x r squared.
3.14 x 17.5 x 17.5 = 962 square feet. (approx). So 2600 pounds รท 962 = 2.7 pounds per square foot.
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  • Vinny
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Vinny replied the topic: Aerodynamics question CPL H

Thank you kindly Bob.

Simple math but I completely forgot how its done.

Thank you again and have a lovely week.

Cheers
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