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09-10-2017 09:49 PM  15 months agoPost 1
3dorbust

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Hudson Florida usa

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Are main rotor blades like aircraft wings in that they can have the same effect that to much pitch can make them less effective? I'm wondering about their profile as well. If I don't plan to invert my helicopter should I use flat bottom blades? Is there any advantage to using them? Can someone tell me about different types?I changed mains a few times and can't tell much difference. I just changed my tails to slightly larger carbons and wow she's locked in now no matter what I do.

I know how Icarus felt

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09-10-2017 10:49 PM  15 months agoPost 2
JuanRodriguez

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The Villages, Florida

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Yes , you can stall out heli blades with too much angle of attack (pitch) just like an airplane wing will stall with too much angle .

Although you could probably find semi symmetrical blades , fully symmetrical blades are more common and is what you should use for sport/ aerobatics even though you may not do so at the moment......

Lots of info on rotor blade design...... just use Google and be prepared for a LOT of reading !

Been there, done that and old enough to know better.....

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09-10-2017 10:53 PM  15 months agoPost 3
AirWolfRC

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42½ N, 83½ W

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Are main rotor blades like aircraft wings in that they can have the same effect that to much pitch can make them less effective?
Yes - - but you really have to go overboard on the pitch before you get to stall.
I'm wondering about their profile as well. If I don't plan to invert my helicopter should I use flat bottom blades? Is there any advantage to using them? Can someone tell me about different types?I changed mains a few times and can't tell much difference.
Two reasons heli blades use symmetrical blades, they perform the same right side up as they do up side down and more importantly, with the airfoil most often used (NACA00xx) the center of pressure does not travel fore or aft with changes of angle of attack therefore keeping the blade pitching forces stable. Asymmetrical blades are more efficient right side up. But with the excess power used on model helis, you probably didn't notice the difference. Asymmetrical blades are most often used on load carrying helis like camera platforms.
I just changed my tails to slightly larger carbons and wow she's locked in now no matter what I do.
Yes, higher rpm and/or more tail blade area will give the tail rotor more authority.

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09-10-2017 11:11 PM  15 months agoPost 4
3dorbust

rrNovice

Hudson Florida usa

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Main blades
Thanks I will stay with my stock carbons. I'm flying with high head speed and low pitch as I'm learning 3d. I did not want to get in trouble with more pitch right now. I'm in between Juan and pistol Pete I hope we all get through Irma safe and sound. Thanks Guy's for putting up with me I will get some gut's to flip my 450 not just my 120 shuttle.

I know how Icarus felt

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09-11-2017 01:26 AM  15 months agoPost 5
grimthenoble

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Viroqua, WI

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You have to realize that there is a difference in lift created over an airplane wing opposed to a helicopter blade. Airplane wings fly straight into the air where equal amounts of air flows over the wing at any point. As you might know the leading edge of a helicopter blade travels much faster than the root of the blade. So I believe it would not benefit any on lift and would be less ridged then a semi symmetrical blade. Even if you don't fly 3D you will still have negative pitches for doing successful autos.

Never go Full Retard!

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09-11-2017 01:27 AM  15 months agoPost 6
JuanRodriguez

rrProfessor

The Villages, Florida

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My wife and I are currently in Rochester, NY, visiting family so we're away from our home .... hopefully all will be ok

Been there, done that and old enough to know better.....

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09-11-2017 02:04 AM  15 months agoPost 7
ICUR1-2

rrElite Veteran

Ottawa, Ontario

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Tail blades
Tail blades on the other hand can make a huge difference in the gyros pid/gains and contribute to that locked in feel.

Recently I had a tail wag that would go away with low gains but It wouldn't hold . So I switched to a slightly smaller profile and that made all the difference.

spending time, paying attention

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09-11-2017 01:31 PM  15 months agoPost 8
870heli

rrVeteran

Monson Ma. USA

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Yes tail blades are over looked and will cause all kinds of gyros to go nuts.

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09-11-2017 03:16 PM  15 months agoPost 9
EEngineer

rrProfessor

TX

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Also check the balance of your blades....main and tail....

Logo 600SXs, 800XX, TDR IIs

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09-11-2017 05:18 PM  15 months agoPost 10
ticedoff8

rrKey Veteran

Morgan Hill, CA. USA

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Asymmetric rotor blades are typically used for scale helicopters and have highly efficient airfoils and are actually "designed" rather than simply manufactured

They are a limited production blade and pretty expensive.

Generically, they are crafted for low-RPM headspeeds (more scale-like).

Some are designed to match a certain model or class of helicopter with narrow cords and/or tappers for 3, 4 & 5 bladed heads.

You can buy them from a couple of places in the EU - scale helis are a lot more popular in the EU / Asia than in the US.

But for sport, just buy the symmetrical blades from whoever you like.
They are all pretty much equal

Believe 1/2 of what you see and none of what you hear.
Fake News will be the downfall of our Republic!

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09-11-2017 08:16 PM  15 months agoPost 11
AirWolfRC

rrProfessor

42½ N, 83½ W

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And also with asymmetric blades, you have right and left blades.

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09-13-2017 05:47 AM  15 months agoPost 12
artimus

rrKey Veteran

Buckley WA

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Right and left blades? Can you explain that? Do you mean rotation?i am lost.

Fly Hard......Team Viagra

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09-13-2017 10:05 AM  15 months agoPost 13
PaulBowen

rrKey Veteran

Victoria, Australia.

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Right hand and left hand rotation.

Futaba T18SZ, JR Propo XG14, Hirobo fanatic!

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09-13-2017 09:59 PM  15 months agoPost 14
3dorbust

rrNovice

Hudson Florida usa

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Main blades
I seen a good way to balance mains it talked about finding the center of balance for each blade. Get that even then balance for weight. It worked great for me her little shake before liftoff is gone. Not sure I believe in ground resonance theory anymore. Do I just weigh my tail blades to balance them they are new carbons and work great. I don't sand down carbons so use tape?

I know how Icarus felt

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