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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › The first set allow to go to 3000rpm
06-04-2015 04:04 PM  4 years ago
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wc_wickedclown (RIP)

rrProfessor

long beach calif

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The first set allow to go to 3000rpm
SpinBlades
The New Black Belt

Watch at YouTube

Watch at YouTube

Insha Allah made in america
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06-04-2015 05:43 PM  4 years ago
jason46

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MI

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In the first video, what was meant by the thickest part of the blades is near the edge?
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06-04-2015 07:26 PM  4 years ago
kthane

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Pensacola

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The amount of smoke being blown up our &%$ is mind boggling.
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06-04-2015 08:01 PM  4 years ago
raholek

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Redesign
Still no mention of a safety wire or being attached to the eyelets for a direct connection to the grip bolt.

Wonder if the video of the failure had any input on the redesign? Hmmmmm....internet may be useful yet.

www.redstickrc.net ama#: 968515
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06-04-2015 08:43 PM  4 years ago
AirWolfRC

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Hmmm . . . any time you crank up the head speed, you will get better response.

Model heli blades have always been way below full scale tip speeds so 3000 rpm on a 700 size just gets up to the tip speeds of full scale. See http://airwolfrc.com/NFB.html about the middle of the page for reference.

Just build the baldes like aircraft parts and not like boat parts and you're good.
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06-04-2015 08:58 PM  4 years ago
Aaron29

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USA

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3000 RPM? To make it more responsive?

Our helis are not in need of more responsiveness lol. I mean really. Are they not moving fast enough as is? 3000 RPM is just going to shorten flights that much more. Plus make things less safe.

I like knowing they are built for that but I'd never operate them like that.
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06-04-2015 09:02 PM  4 years ago
rcflyerheli

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Granbury, TX USA

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While I was checking on the differences between CF and Kevlar, I came across this interesting article.

http://www.gizmag.com/cellulose-nan...r-kevlar/23959/

Very interesting. Imagine blades stronger than CF only costing $10-15 dollars. Only drawback that I saw was that you can't fly them in the rain.
Logo 700, Specter 700, Goblin 700, Trex 700DFC, Gaui X7, Logo 690SX, Logo 600SX; Trex 470 Trex 500
Amain Team Rep
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06-04-2015 09:33 PM  4 years ago
raholek

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Flying at 3k
Don't think they want to fly at the rpm.

Some SB blades were failing during overspeeds in excess of rated 2500 rpm for blades. Guys were doing McDougals at 2250 set speeds and exceeding 3000rpm on the overspeed. A huge thread asking SB to address the failure problem and their method of blade retention during failures was on both sites. I am assuming this is there answer without actually addressing the old blades possible issues.

Watch at YouTube

www.redstickrc.net ama#: 968515
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06-04-2015 09:35 PM  4 years ago
kthane

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Pensacola

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As far as I know they still aren't using a safety wire. The Kevlar rope that didn't stand a chance when root cracked from drilling the bolt hole (really?) is still the only means of securing blade weight in blade.

My guess is they have more reps than customers, but who knows.
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06-04-2015 09:47 PM  4 years ago
Aaron29

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USA

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McDoogles.

Then ask the company to fix the "issue." Lol. It's like intentionally running your car into a wall and asking for a better bumper.

In full size flying we have operating limitations. Exceeding them results in structural damage. If you take a Cessna and power dive it to 220 knots then complain a few rivets popped out and an aileron fell off you'd be laughed out of the hangar.
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06-04-2015 09:51 PM  4 years ago
kthane

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Well if the car company sales rep was running cars into walls at car shows this might be true...
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06-05-2015 12:47 AM  4 years ago
prototype3a

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Christiansburg,VA

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The SB rpm ratings and mcdoogles didn't matter. Many people came forward with many blades that were run well within the rated rpm and they still failed. The problem was that SB did not put ANY CF into the roots of their blades. Where the bolt hole was, there was only epoxy. Wire or kevlar doesn't matter if they're not anchored properly in the root of the blade.

Frankly, showing Dunkan B. doing mcdoogles doesn't prove anything either as he did the same thing on the old blades. Except, it is assumed that he was either crashing them or just replacing the blades long before they would fail.

The only way SB will ever convince me that the issue is fixed is if they actually start showing photos of of their blade roots cross sections.
~Drew
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06-05-2015 01:19 AM  4 years ago
Dan Minick

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Columbus, WI

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3000 RPM huh? I wonder if Spin blades is paying Dunkan B's life insurance?Team Synergy, Team FBL Rotors-------if its not broke...it will be!
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06-05-2015 01:37 AM  4 years ago
Dawiev

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Middle East

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Quite early in the main video they mention a new process to form the root and that the bolt hole is not drilled anymore, giving more strength and rigidity.

Perhaps their way to address previous issues and make the new rpm possible ?
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06-05-2015 01:52 AM  4 years ago
wc_wickedclown (RIP)

rrProfessor

long beach calif

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Perhaps their way to address previous issues and make the new rpm possible ?
2 min flight time an puffed lipo's lol ill pass on 3000 rpm bet its fun tho.
Insha Allah made in america
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06-05-2015 04:53 AM  4 years ago
Cobra 46

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Cambridge il usa

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Wise words WC !!
I fly 1000 rpm. Any blade will do ! Lol
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06-05-2015 05:18 AM  4 years ago
MMarozas

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chicago

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Hi guys. I have been flying the new Black Belts. First off, there not saying you should fly at 3000rpm lol. This is the first set designed to handle 3000rpm without a problem. I have tested it, and was able to overspeed them to 2850 and no problems. As far as crashing with the new design. There is Kevlar instead of a safety wire. I have crashed 5 sets and the lead has stayed with the blade every time. The blade roots have also not broken once in a crash yet, showing that their new way or molding the blade whole is working. Overall they seem just as safe if not safer then any other blade on the market today.
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06-05-2015 05:01 PM  4 years ago
raholek

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Zachary, Louisiana

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Lack of safety wire
I don't see how these blades can be as safe as other designs. When the set of blades in video let go...it threw a blade over a 100ft into our parking lot and bounced off a car. We were lucky that they didn't spear the pilot or someone on the flight-line.
You can defend SB until the cows come home. They need a safety wire or proven method of retaining blades with the machine in a crash/blade failure.
I liked the way the old blades flew, sounded and looked. Can't fly my 2 sets of 800mm blades ($200 per set) because of a poor design and fear of failure.

The failure mechanism is a moot point with the changes. The outcome of another type of failure can still net a lawn darted blade that can injure pilots or bystanders. Not to mentions money lost on destroyed machines from old design of blades. Don't think I will buy any SB blades until they prove that they won't fail and hurt someone.
www.redstickrc.net ama#: 968515
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06-05-2015 05:31 PM  4 years ago
AirWolfRC

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Blade design and susceptibility to failure is simply a matter of mechanical design. The forces involved can all be calculated and even more easily tested in a controlled environment.

Knee jerk fixes like safety wire are not necessary.
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06-05-2015 05:41 PM  4 years ago
Cobra 46

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Cambridge il usa

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Airwolf ,
I agree
There are a lot of things built 100%
Composite that take stress over and over ! Look at an all carbon full size airplane or an
F 1 car, Lots of stress and g forces .
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