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HomeAircraftHelicopterMain Discussion › Wide Chord blades...what's the advantage?
03-08-2010 07:11 PM  8 years agoPost 1
Old Slow Rotor

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Elk Grove CA

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So what is the advantage of running a wider chord blade?

Greater blade area provides more lift?

Decreases the Wing/Blade loading?

Give's you better auto perfomance due to more weight?

More directional performance due to lighter blade/wing/loading?

Whats the concensus?

GMP/Schulter/ Graupner Bell 222/HK600GT/X-cell Ct 60/ RCA MD500E

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03-08-2010 07:22 PM  8 years agoPost 2
bkervaski

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Birmingham, AL, USA

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They bite harder but don't recover as fast.

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03-08-2010 07:24 PM  8 years agoPost 3
Jasper7

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Birmingham , UK

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Agree

Firsy time a put WC on noticed the Bite, also hand time was huge

Steve

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03-08-2010 08:43 PM  8 years agoPost 4
Flying Brian

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St. Clairsville, Ohio

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Are Radix 430mm blades considerd "Wide Chord".

"I just don't Listen" "

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03-08-2010 10:21 PM  8 years agoPost 5
Justin Stuart (RIP)

rrMaster

Plano, Texas

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You're talking about the Mavirkk G5 blades?

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03-08-2010 10:34 PM  8 years agoPost 6
Solmanbandit

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Tucson , AZ

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What do you mean by bite and don't recover as fast?

Trex 700E / Trex 500 ESP - Ikon/ HD 500 - Ikon 2/ Goblin 500 Ikon 2

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03-08-2010 11:09 PM  8 years agoPost 7
Terrabit

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Seattle, WA - USA

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What do you mean by bite and don't recover as fast?
When the blades "bite" the disc loads, the heli accelerates and headspeed slows. "Recovery" refers to the length of time it takes to regain your initial headspeed.

It may be useful to consider that ANY change in speed or direction equates to acceleration; slowing or stoping is negative acceleration. And, there is an inverse relationship between blade acceleration and heli acceleration. This is in essence Newton's third law of motion.

Newton's Laws of Motion (in basic form)

1. An object in motion will stay in motion, unless an outside force acts upon it.

2. A body will accelerate with acceleration proportional to the force and inversely proportional to the mass.

3. If body A exerts a force on body B, then body B will exert an equal and opposite force back on A for the same period of time.

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03-08-2010 11:47 PM  8 years agoPost 8
helibeast

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Mn

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Newton's Laws of Motion (in basic form)
1. An object in motion will stay in motion, unless an outside force acts upon it.

2. A body will accelerate with acceleration proportional to the force and inversely proportional to the mass.

3. If body A exerts a force on body B, then body B will exert an equal and opposite force back on A for the same period of time.
WoW all of that just from having a apple fall on his head

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03-09-2010 03:32 AM  8 years agoPost 9
Solmanbandit

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Tucson , AZ

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It blows my mind that you all have flown long enough to pick out so many little things.

Trex 700E / Trex 500 ESP - Ikon/ HD 500 - Ikon 2/ Goblin 500 Ikon 2

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03-09-2010 04:29 AM  8 years agoPost 10
RAPTOR 4D

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GRANGER,IN,-USA

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More surface = More area =s More load!
Advantages, Very stable and awesome autos!

Raptor 50 Titan SE

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03-09-2010 04:50 PM  8 years agoPost 11
Hamo

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Ireland

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I guess wider blades = more lift but more drag. Therefore a bigger load on the engine. If you've ever flown in a window seat and watched the wings during takeoff and landing you'll have noticed that the wings are extended to make them wider to produce lift at lower speeds.
Once the plane reaches cruising altitude and speed, the extended parts are withdrawn to make the wings narrow to reduce aerodynamic drag at high speed.
Hamo

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03-09-2010 06:01 PM  8 years agoPost 12
Old Slow Rotor

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Elk Grove CA

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Induced Drag(engine getting loaded down) is created as a byproduct of additional lift .So wider blades are apparently going to give you better lift be it postive or negative.

"Recovery" as I'm understanding it, is "the head speed returning to the set rpm"..... "Recovery" is going to be slower because the blades are wider heavier and have more parasitic drag with engine power being used to re-accelerate the head/rotor back to the set rpm.

Bite: as the blades are pitched producing more lift, they slow the head/rotor speed down quicker
More bite :
quicker decrease in head speed with more induced lift.

Soooo I would think if maintaining head speed was important to your style of flying you would stay away from wide blades, but if you want to go ballistic from the pad to say 800 ft, wide blades is the way to go, along with more weight and blade area for autos...

BTW: the flaps on a fixed wing(planker) are designed to re-camber the wing to provide greater lift at slower speed, not so much as to increase the wing area as some flaps(fowler style will do) although both is a good thing when going slow.....

Thanks for answers....

GMP/Schulter/ Graupner Bell 222/HK600GT/X-cell Ct 60/ RCA MD500E

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03-10-2010 01:15 AM  8 years agoPost 13
chopper_crazy

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Delphos, Ohio

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Depending on the heli, I like a wide chord blade. You can definately tell a difference running regular blades compared to wide chord as the previous posts mentioned.

It's a complex, costly, glow powered anti-gravity machine!

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03-10-2010 03:39 AM  8 years agoPost 14
HeliVIG

rrApprentice

Hearne, TX USA

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One point about the wide chord vs narrow chord. You can only tell the real difference when you have two blades that are otherwise exactly the same. In other words the only thing you change is the chord. Then you can directly compare. When you have two different blades of different airfoil, weight, CG, bolt hole, thickness, surface finish and stiffness many things affect the performance.

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03-10-2010 05:08 AM  8 years agoPost 15
GimbalFan (RIP)

rrProfessor

Big Coppitt Key, FL

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One point about the wide chord vs narrow chord. You can only tell the real difference when you have two blades that are otherwise exactly the same. In other words the only thing you change is the chord. Then you can directly compare.
Makes sense. Good to see you're still using that funky white knob on your tx's. Sure sets 'em apart.

op-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-t

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03-10-2010 07:15 PM  8 years agoPost 16
Old Slow Rotor

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Elk Grove CA

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"Going in "reverse"... still using..the funky old "hover pitch trim" lever on the futaba 513 pcm ssh radios... major trim change from 550s to 600s. Should be interesting to see what happens going from the old school wide blades to something newer and narrower of the same length.

GMP/Schulter/ Graupner Bell 222/HK600GT/X-cell Ct 60/ RCA MD500E

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