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HomeAircraftHelicopterHelicopter Main Discussion › Blade size
05-31-2015 04:23 AM  3 years agoPost 1
HeliRyan

rrApprentice

Colusa ca

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Gotta align dfc 700 nitro.. Was wondering what be affected if I bumped the blades to 715.. Got 695s on now with os91hz.. Curious as to anyone with experience with blades size and performance or stick with the 695s.. Was thinking about cyclone 715s

I don't crash, I land at full speed!

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05-31-2015 07:20 PM  3 years agoPost 2
wc_wickedclown (RIP)

rrProfessor

long beach calif

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ive used 710s but i like the 695s

the 710's had better hand time when doing autos and tic tocs

Insha Allah made in america

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05-31-2015 08:31 PM  3 years agoPost 3
raholek

rrVeteran

Zachary, Louisiana

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Nitro
Changing blade sizes makes a bigger difference on a Nitro than on Electric. Will load the motor more.
Possible change your optimal tune.

I would stick with the 695s on your Nitro. Just my preference. Yes, I have tried 710's and 715s. Back with 695s on both of my OS 105 machines.
Run 710s on my electric 700s. Can smack it around and Electrics just pull more amps and keep chugging. A nitro could bog and make governor struggle to keep motor on target rpm.

Good luck.

www.redstickrc.net ama#: 968515

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05-31-2015 10:12 PM  3 years agoPost 4
jackp332

rrKey Veteran

Claremont, Nh USA

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I think you could tune for either. It is a matter of flying style/preference, in my opinion. I am into easy sport flying and shooting autos so I like the 710-720's on all of my 700 birds. If I were into 3d or smack I would think you would want to stick with the shorter blades so your engine would have maximum grunt to throw the machine around. Again, I think it all depends on your flying style and what you are asking of your machine. I have a raptor 90 with an os61sxh in it that swings mavrikk 710's no problem and flys like a dream for my easy style.

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05-31-2015 11:55 PM  3 years agoPost 5
HeliRyan

rrApprentice

Colusa ca

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No hard smack or stick banging going on.. Mild sport flying and doing huge autos.. Not asking a lot on the motor and no low flying . Most of my routine is big air. Thanks guys . You made my decision that much more easy. That's why I ask. Thanks guys

I don't crash, I land at full speed!

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05-31-2015 11:58 PM  3 years agoPost 6
jackp332

rrKey Veteran

Claremont, Nh USA

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You're very welcome- glad my limited experience could be of help. From what you say, it sounds as if you'd really enjoy the larger blades. If you end up not liking them, they are usually a fairly easy sale on the classifieds here I have found.

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06-01-2015 12:15 AM  3 years agoPost 7
AirWolfRC

rrProfessor

42½ N, 83½ W

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Depends on your head speed but I suspect that you're already running faster than any efficiency objective would allow. If you go to bigger blades, you'll just be even less efficient. (wasting power)

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06-01-2015 12:21 AM  3 years agoPost 8
HeliRyan

rrApprentice

Colusa ca

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I have a another 90 size set up perfect for hard 3d... I don't mind wasting power if it's just a cruiser and sport flying.. I was just curious what would be the downs and the positives from experienced flyers .. I appreciate all the input .. Head speed is at 2100

I don't crash, I land at full speed!

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06-01-2015 02:13 AM  3 years agoPost 9
AirWolfRC

rrProfessor

42½ N, 83½ W

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Going to larger blades has the same effect as going to 3 blades or more. You require more power to do the same things. (it's less efficient)

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06-01-2015 02:56 AM  3 years agoPost 10
HeliRyan

rrApprentice

Colusa ca

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So what you're really saying is that I need a 105 or bigger to run those?? Which requires more fuel. Which in my opinion is less efficient Because you now have to burn more fuel for the same flight time. Everytime i bump in size makes my pocketbook less efficient.Yes? I don't use all 2500hp in my drag car but it's there. Does that mean it's less efficent? Hell I don't know.. Lol it's a drag car!!!!!Not trying to argue efficiency . Just curious how the helicopters behave with different size blades.. But thanks for all the input guys. So don't bite my head off

I don't crash, I land at full speed!

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06-01-2015 03:10 AM  3 years agoPost 11
AirWolfRC

rrProfessor

42½ N, 83½ W

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Just trying to help educate.

The real question is WHY are you looking at larger blades ?

If it's to get better performance . . . you're barking up the wrong tree.

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06-01-2015 03:17 AM  3 years agoPost 12
HeliRyan

rrApprentice

Colusa ca

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No Iam happy with the way my other 90s are set up just curious as why to run the larger blades?? More power to run bigger blades makes sense.. I have a nx4 that flys just like a mini 90. I wouldn't dream of putting anything bigge because the response is not what Iam looking for... Been practice huge autos and thought maybe that would give me a little more when the power is cut. That's all. Iam just not looking for the max performance .. Just wanting a huge turd to float around in the air. Lol

I don't crash, I land at full speed!

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06-01-2015 03:17 AM  3 years agoPost 13
HeliRyan

rrApprentice

Colusa ca

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Thanks you airwolfrc I appreciate it I really do

I don't crash, I land at full speed!

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06-01-2015 01:45 PM  3 years agoPost 14
fastflyer20

rrKey Veteran

N. Tonawanda, NY

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I have always preferred 690 size blades. Recently I tried the 715 cyclones and was very impressed, cyclic response was faster than 695's, they did not drag the engine down like other blades I have tried and of course autos were better. If you can borrow a set to try for a flight or two, that would be the best way to determine what is right for you and your style of flying.

Tom
CAUTION - my posts are based on my experiences, yours may be different.

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06-01-2015 06:05 PM  3 years agoPost 15
AirWolfRC

rrProfessor

42½ N, 83½ W

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If you want a big turd to float around the sky with, try reducing your head speed to maybe 1800.

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06-01-2015 07:47 PM  3 years agoPost 16
MattJen

rrElite Veteran

UK

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Autos are very nice with longer blades..

Matt

All The Best

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06-02-2015 05:06 PM  3 years agoPost 17
AirWolfRC

rrProfessor

42½ N, 83½ W

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Sure they are . . . but that's like saying a plank with longer wings (a glider) floats better.

Make up your mide what you want . . . it's all a bunch of compromises.

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06-02-2015 06:28 PM  3 years agoPost 18
oldfart

rrProfessor

Vancouver, Canada

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I really think that one cannot make a blanket generalization that a longer blade will perform better then a shorter blade, simply because there are so many variables that effect the final performance of any blade design. That is why one may find that a shorter blade of one design may perform better then a longer blade from another and vice-versa.

Also a lot of factors in designing an airplanes wing go out the window when designing a rotor blade, simply because the tip of the rotor blade is operating at a higher airspeed then the portions of it that rotate closer to the center. The tip of an airplane wing is always traveling at the same airspeed then its' root.

The combinations of airfoil, aspect ratio, tip shape, chordwise CG, spanwise CG, internal structure and other factors can make a big difference in the final performance and efficiency of a rotor blade.

This is why some blade manufacturers make blades of similar length that have different model numbers. These numbers will indicate weather the blade is designed to better satisfy the desires of the scale/sport/beginner, or the hot smack 3D pilot, or the precision 3D pilot competing in the FAI/F3N catagory or the one competing in the precision FAI/F3C catagory.

There will even be some minute differences in the blade optimized for Fb systems compared to their blade that is optimized for FBL systems.

Phil

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06-02-2015 08:02 PM  3 years agoPost 19
Santiago P

rrProfessor

South West, Ohio

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well said ^^^ Phil

Longer blades create more lift @ the same RPM, a bit more drag as well. There are also less agile if everything else (airfoil, chord, RPM, Weight, CG position) is the same.

If you run longer blades and drop the RPM some, they will work more efficiently.

For higher altitude MSL, or bad density altitude, longer works better overall.

For low RPM rotor, longer is better. Wider chord also helps.

In 3D, shorter is more agile, longer has more collective pop.

Blades need to match your own:
1. heli
2. setup
3. flying style

At the end of the day, blades are like shoes. There is a perfect pair for each task, and there is no one size fits all...

Santiago

Team Minicopter - PeakAircraft.com
bavarianDEMON- Team Kontronik - Scorpion Motors-

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06-02-2015 08:11 PM  3 years agoPost 20
Santiago P

rrProfessor

South West, Ohio

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it's all a bunch of compromises.
best definition of aerodynamic design I ever read

Finding the set of compromises you can live with the best is the Holy Grail.

S

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