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HelicopterAerial Photography and Video › Blade efficency
08-31-2009 12:57 PM  8 years agoPost 1
ActionAP

rrApprentice

Brisbane, Queensland

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Hi folks, I have been wondering for a while about the aerodynamic efficency of our rotor blades. A smooth surface is not the most efficent surface for air to travel over. I found this out when reserching how to port and gas flow a motorcycle head. Turns out a rough or dimpled surface is more efficent as it allows the air to tumble and not stick to the surface. This is why golf balls have dimples and are not smooth.

So why is it that our blades don't follow suit? I cant imagine a better application for this technique. Could we be missing out on even a small gain in efficency?
Has anyone heard of dimpled blades on full size helis?

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08-31-2009 06:07 PM  8 years agoPost 2
jascamera

rrVeteran

san francisco, ca

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I think V-blade makes blades like that. TST version.

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08-31-2009 07:51 PM  8 years agoPost 3
SeismicCWave

rrVeteran

Hilo, Hawaii

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>>Has anyone heard of dimpled blades on full size helis?<<

It is more involved then just arbitrarily making dimples on the surface of the airfoil. Airfoil is airfoil, they are the same on a fixed wing or a rotary wing. So why isn't the wing on all airliners have dimples. The short answer is that they do. They are called turbulators. If you travel by air sometimes go look out at the wing and you will see a row of little squarish looking fins sticking out. Some may be offset a little bit from the direction of air flow. They are there to create turbulence.

Air flow through an airfoil differently then a round object like a golf ball. You have to concern with where you create the separation and figure out the reattachment point at the back of the foil.

Yes, they are there, it is simply not quite as simple and cut and dry as you may think.

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09-01-2009 10:18 AM  8 years agoPost 4
borneobear

rrVeteran

Kuala Lumpur, Malaysia.

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If its rough surface you want, then the V-blade TST is the way to go - reminds me of shark skin.
The only difference I feel when using them is the quieter flight. Flight duration is hardly a factor.

TSTs should come back into production any time soon.

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09-01-2009 12:00 PM  8 years agoPost 5
Mr Boombastic

rrApprentice

NSW Downunder

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Hit them with some 60 Grit.

Some of the small counter rotating helis have a raised wavey line on the leading edge to help things. These though are fixed pitch.

Not sure here how you go at full pitch on a symmetrical blade and the effect on blade stall.

Blade Thrashing Lessons: Enrol Here

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