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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › The first set allow to go to 3000rpm
06-05-2015 05:41 PM  4 years ago
prototype3a

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Christiansburg,VA

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I feel like some sort of video showing the blades failing in a controlled environment might help. But then there's the fact they denied that their previous design was horrible and flawed. So at this point, I'll probably never buy a pair of their blades anyway.~Drew
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06-05-2015 05:45 PM  4 years ago
raholek

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Method of Failure
Knee jerk fixes like safety wire are not necessary.
Did you watch the video? Regardless of mechanism of failure..a blade launched hard enough to have impaled a person that was close to the failure. Hence the pilot, spotter and camera guy were in danger. A proven method of retaining blades in a failure/crash is not a 'knee-jerk' reaction. But a legitimate, proven fix for a very real hazard.

I guess the video doesn't do the failure justice. It was quick and violent.
My SB blades have never been oversped nor have the been involved in hard 3d. They have cracks around the blade eyelets. If they were safety wired...I would fly them. But they have the kevlar strip that pulled out cleanly in the failure.

Good luck with your SB blades. I won't be your spotter at an event.
Don't understand the support of company that ignored our plight.
www.redstickrc.net ama#: 968515
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06-05-2015 06:37 PM  4 years ago
MMarozas

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chicago

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Not sure how many people are aware of this, but the set of Spin Blades that failed on Tyler's X7 were prototype blades, and were not supposed to be flown in public. Lots of prototype products fail form all the companies (not just blades) but people don't hear about them, because they are tested alone. The set that failed had extra weight in them to try and help with tracking. They weighed 230g when most blades on the market are anywhere from 180-210. And the red tip was rated for 2200 rpm for a 195g blade. The blades failed over 2600rpm with extra weight. Now the new Black Belt is a entirely new design and mold then the old blade. The safety wire installed in other blades is to keep the lead weight from flying out during a crash and hitting people, (which we have sadly seen before at events from other blade manufactures) not to keep the roots together. Now the New "Black Belt" are the only blade manufactured world wide were the bolt whole is not drilled after words. Spin blades has a strength test machine that is able to pull blades with up to 2 tons of pressure. The old red tip design and other popular blades were breaking at about 1000kg or 1 ton. The new Black Belts are able to handle 2tons (double the force) sadly their machine can't go any higher then 2 tons. By doing the math in order for the blades to pull more then 2 tons at their weight, they would have to be spinning supersonic. If anyone is able to go supersonic with a model helicopter they will be picking up lots of pieces lets just say haha. A lot of effort has gone into making these blades safer then ever before. I believe you guys will how safe these blades are in future crashes seen in public.
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06-05-2015 06:48 PM  4 years ago
Cobra 46

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Cambridge il usa

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Nice info
Thanks
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06-05-2015 06:54 PM  4 years ago
Pistol Pete

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Seffner, FL

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Hey...
Raquel Bellot recommends them. Enough said. Close this thread.
Olé!
~~Enjoying the hobby one flight at a time~~
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06-05-2015 07:29 PM  4 years ago
prototype3a

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Christiansburg,VA

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2 'tons'. Is that English tons, metric tons or short tons? Either way, it sounds weak to me. MTS? Instron? Or just some backyard engineering setup using a bottle jack?

If SB can't break them then how do they know how they will fail? How do they know the Kevlar will hold the lead?
~Drew
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06-05-2015 08:35 PM  4 years ago
MMarozas

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chicago

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2 metric tons = 2000kg= 4,409lbs Sounds weak? Im sorry but 4,400lbs of force is way more than a rc helicopter could every produce. The blades don't fail thats the point of the test, not how will they. The kevlar is their for a crash not for a failure. We have had plenty or real world crash testing to test the kevlar and holding the weights. How is a pull test going to show you if the lead weight spinning 3000 rpm is going to stay with the blade? I still dont understand how you think 2 tons of force is week for a rc helicopter when the most popular blades are failing at half as much.
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06-05-2015 08:48 PM  4 years ago
AirWolfRC

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A 180gm 710 blade at 3000 rpm puts about 1800 lb force on the blade grip.
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06-05-2015 09:59 PM  4 years ago
prototype3a

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Its quite simple, SB has done nothing to earn our trust. Have they recalled all their faulty blades? Have they integrated black belt tech into all their blades?~Drew
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06-05-2015 11:20 PM  4 years ago
AirWolfRC

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I don't understand, what's the big deal ? ?
. . . some here talk like the SB blades are failing left and right
I don't see that happening.
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06-05-2015 11:58 PM  4 years ago
BobOD

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New York- USA

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I understand those that feel burned but you really should consider what's being pointed out here. Before, they had a blade that is rated 2300 RPM. Now, we all know that we push things and expect it to handle it anyway. But, we can't bash a company too hard when they are actually providing real specs.

So, now they have a blade that is rated at 3000 RPM. Up to you if you believe but time will eventually tell.

Me personally, I have to respect the manufacturer that's giving real specifications and I will take the responsibility if I decide to run outside.
Team POP Secret
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06-06-2015 01:17 AM  4 years ago
EEngineer

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TX

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A 180gm 710 blade at 3000 rpm puts about 1800 lb force on the blade grip.
Doesn't the distance of how far the blade is mounted from the center of rotation enter into the force, all other things remaining equal?

The bigger the rotor head the more the force.
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06-06-2015 01:40 AM  4 years ago
MMarozas

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chicago

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Spin Blades has done a ton to try and earn you're trust. Completely redesigning their blades twice as strong as most leading brands?? And you have to remember that 1. there wasn't a problem with the production public blades. 2. The blades failed 400rpm passed what they were rated for. Now if you choose to go and push the limits passed what the manufacture says, thats up to you. But way to many people are acting like it was a left and right issue the public was having. Again 1 failure of a "prototype" blade, and now everyone thinks the whole company is corrupt??
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06-06-2015 02:19 AM  4 years ago
raholek

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So...MMorosa... I assume you are a factory rep? Maybe you could ask them to replace my blades. Or replace Tyler's Kit that was destroyed. Did they swap all your old blades for the new ones?

This is not people bashing a company on rumors. Look at the threads. Photos and people posting concerns. Remember...we buy the product. I will speak about how they handled the problem with their product with my dollars. But stick to your guns. Keep ignoring your the customers in this small market. Sounds like a great business model.
www.redstickrc.net ama#: 968515
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06-06-2015 04:18 AM  4 years ago
BobOD

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allow to go to 3000rpm
OH, BTW...for those of us running plastic grips, I don't recommend.
Team POP Secret
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06-06-2015 06:02 AM  4 years ago
MMarozas

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chicago

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@raholek Yes I am a factory rep for the USA. Thats why I'm here telling you the facts behind the situation not the assumptions some of these people are coming up with
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06-06-2015 06:18 AM  4 years ago
EEngineer

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TX

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No one is doubting you...

What people are wondering how the tests are performed.

Could you post specific details of your test plan?

Thx
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06-06-2015 02:24 PM  4 years ago
prototype3a

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Christiansburg,VA

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I understand those that feel burned but you really should consider what's being pointed out here. Before, they had a blade that is rated 2300 RPM. Now, we all know that we push things and expect it to handle it anyway. But, we can't bash a company too hard when they are actually providing real specs.
So, now they have a blade that is rated at 3000 RPM. Up to you if you believe but time will eventually tell.
Me personally, I have to respect the manufacturer that's giving real specifications and I will take the responsibility if I decide to run outside.
The problem is that their older blades were failing at RPMs well below the specified maximums which means their specs were BS and/or testing methods were faulty.

Sure, some people ran them beyond the specified max RPMs but that is just plain foolish to begin with.

This is why I don't believe that the new blades really can handle what they're claiming. It has already been stated that they don't know how the new blades fail (when they eventually do) which makes the claim that the lead is held in with kevlar quite pointless.
~Drew
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06-06-2015 03:51 PM  4 years ago
BobOD

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failing at RPMs well below the specified maximums
Ah...that's different. In that case a trustworthy manufacturer would replace.
Team POP Secret
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06-06-2015 11:25 PM  4 years ago
AirWolfRC

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I read specifics of a prototype blade but . . .
I have heard NO other specifics . . . just a bunch of moaning and groaning.
I have trouble going along with that kind of hearsay.
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