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HomeAircraftHelicopterBlades and Night Flying News  New technology
03-11-2013 12:14 AM  5 years agoPost 21
Justin Stuart (RIP)

rrMaster

Plano, Texas

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$75 is a good price for a set of 690's. Are they CosFlaws? Last set of 690's I bought was around $130. Blades are a pretty much disposable part of the helicopter, so cheaper blades are good (in my opinion). I see a lot of guys at my local field flying the 3D blades from HobbyCity. I'm not sure how much they cost, but I always stand back when they are spooling up the helicopter just in case one of them decides to self-destruct.

Avant RC
Scorpion Power Systems
Thunder Power RC
Kontronik Drives

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03-11-2013 12:16 AM  5 years agoPost 22
McKrackin

rrProfessor

Lucasville,Ohio

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Not blems as far as I know...Just clearing out the flybar blades.

I literally never use the word literally right.

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03-11-2013 12:23 AM  5 years agoPost 23
McKrackin

rrProfessor

Lucasville,Ohio

My Posts: All  Forum  Topic

My bad...$78

http://www.readyheli.com/LE-713FB-E...on_p_36736.html

I literally never use the word literally right.

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04-07-2013 05:17 AM  5 years agoPost 24
Santiago P

rrProfessor

South West, Ohio

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Increasing the chord at the tip slightly reduces the Reynolds number but has no effect on the Mach number.
Actually increasing the chord increases the Re numbers as the size or lenght dimension corresponds in the numerator of the ratio. That is good, as the efficiency normaly increases with the Re number.

What do reduces the critical M number is a thinner airfoil at the tip, or sweeping the chord.

Who is selling these blades?

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

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04-07-2013 06:32 AM  5 years agoPost 25
Jgatorman

rrVeteran

Birmingham, AL

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I met Tim Jones this year the Birmingham fun fly.I had quite a nice sit down with him discussing these blades. He's one of the nicest people you'll ever meet and if what he says is true this should be an excellent blade. I did see them fly however and they were exceptionally quiet and as hard Tim flies his Helis' that's a pretty good statement to start with. Only time will tell.

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04-07-2013 03:17 PM  5 years agoPost 26
777ER

rrApprentice

Westchester county, NY, USA

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Yea . . . right . . . and I've got a bridge in NY for sale . . .
The old Tappan Zee bridge in NY is for sale

-Chris

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04-07-2013 03:20 PM  5 years agoPost 27
777ER

rrApprentice

Westchester county, NY, USA

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Who is selling these blades?
Amainhobbies

http://www.amainhobbies.com/product...Blade-Set-695mm

Expected to be available May 1st. I got one pre-ordered 2 months ago.

-Chris

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04-07-2013 03:37 PM  5 years agoPost 28
AirWolfRC

rrProfessor

42½ N, 83½ W

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Increasing the chord at the tip slightly reduces the Reynolds number but has no effect on the Mach number.
I was not thinking right that day, Increases, not decreases.

Either way, since most all out helis fly with a tip speed not more than about Mach .5 , it really doesn't matter much.

Full scale helis have a higher tip speed.
See http://airwolfrc.com/NFB.html

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04-07-2013 05:22 PM  5 years agoPost 29
GetToDaChopper

rrElite Veteran

Las Vegas , NV

My Posts: All  Forum  Topic

Either way, since most all out helis fly with a tip speed not more than about Mach .5 , it really doesn't matter much.
Exactly ! the blade tips would have to be over 5 feet apart and turning around 3000 RPM to hit Mach 1.0

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04-07-2013 09:26 PM  5 years agoPost 30
Santiago P

rrProfessor

South West, Ohio

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yeah yeah, I know, the mach number still low.

I was just correcting what AirWorf said, who BTW, is always on the money with good facts, except that one time.

What I don't get is why the wider tip which puts the spanwise lift distribution even more towards the outside making the induce drag worst.

On the other hand, the way we operate our blades (too dang fast), the parasite drag is normally the killer, so it could be a better blade overall if one does not have to swing 700mm blades at 2000 and umpteen RPMs to get a more aggressive pop.

Santiago

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

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04-07-2013 09:50 PM  5 years agoPost 31
AirWolfRC

rrProfessor

42½ N, 83½ W

My Posts: All  Forum  Topic

On the other hand, the way we operate our blades (too dang fast), the parasite drag is normally the killer, so it could be a better blade overall if one does not have to swing 700mm blades at 2000 and umpteen RPMs to get a more aggressive pop.
And that's the trade-off . . . more efficiency or more pop . . . take your pick.

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04-07-2013 10:00 PM  5 years agoPost 32
GetToDaChopper

rrElite Veteran

Las Vegas , NV

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So what is the bottom line with these new type of blades IYHO ?

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04-07-2013 11:52 PM  5 years agoPost 33
Santiago P

rrProfessor

South West, Ohio

My Posts: All  Forum  Topic

tapered airfoil, TE swept, more tip area...
EDIT:
It all "sounds" like an ideal blade for 3D. If the blade work as intended, it "should" yield longer flight times due to the lower RPM needed without feeling mushy on the collective.

bottom line: one need to test them.
We can speculate til the cows come home, but until one tries the pudding we won't know.

Personally I'm looking for the opposite: progressive tapered chord and airfoil, but my interest is speed and efficiency, not necessarily a steep lift vs. AOA curve (3D)

santiago

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

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04-08-2013 12:13 AM  5 years agoPost 34
GetToDaChopper

rrElite Veteran

Las Vegas , NV

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ah i see, sounds good, we wait and see......

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04-08-2013 08:13 PM  5 years agoPost 35
HeliSmith

rrVeteran

Chico, CA

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I hope they are all that and a bag of chips, with Tim Jones putting his reputation on them I bet they will be. I listen to all the information but in the end I just need to try them

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04-16-2013 11:44 AM  5 years agoPost 36
rpat

rrElite Veteran

Weirton, W. Va.

My Posts: All  Forum  Topic

Has any one gotten these yet?

trex 700fbl cal30,minititan,, trx600fbl,trex250,logo 500,Velocity N2

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05-28-2013 11:46 PM  5 years agoPost 37
Sillyness

rrVeteran

Little Rock AR

My Posts: All  Forum  Topic

The advancing blade of a Heli with 710mm blades turning 2200 RPM hitting 150mph on a speed run on a 41F day hits Mach .73. Local flow at high pitch is most certainly approaching transonic.

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07-11-2013 02:33 PM  5 years agoPost 38
ZS-JAF

rrVeteran

Nazareth, PA

My Posts: All  Forum  Topic

About to press buy has anyone tried them?

I have a 3D heli, I don't understand why it doesn't do 3D.

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