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Old Oct 10, 2012, 05:05 PM
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FMS 1700MM F4U-4 Corsair and P-47 Hub Issue

This is a video of my FMS V2 1700MM F4U-4 Corsair in a fatal crash due to an improper hub design. This video has been making the rounds and showcases the importance of properly developed and designed parts to RC airplanes. There has been numerous strides in quality and technology in our hobby recently, but this is evidence that there can always be more attention to detail and safety.

FMS has been notified and they have already responded that they are already working on a new hub design with superior quality to ensure this doesn't happen again. I'm very fortunate this took place away from the flight line and the crowd that was there watching the flight.

The 1700MM F4U Corsair and P-47 are the two planes in question as far as the hub design goes. For those of you who have purchased these planes, the replacement hubs should be available very soon. Talk to your distributor about getting that hub replaced. I would not trust the version you have.

Fatal Crash of the FMS 1700MM V2 Corsair (3 min 18 sec)
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Old Oct 10, 2012, 09:57 PM
my Head is Spinning!!!
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Dang! I'm happy nobody got hurt. I hope FMS replaces your plane.
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Old Oct 10, 2012, 10:00 PM
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Yes me too. And they are replacing my plane.
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Old Oct 11, 2012, 01:44 PM
Finally made a maiden flight!
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Old Oct 11, 2012, 09:19 PM
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Aros -

I've read very little of the Lx/blitzw. Corsair thread but I don't recall any big problem like this showing up on it. Looks like, from what I see it's a simpler design and incorporates assist from the hub nut to hold clamping pressure. Is that correct?

Jack
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Old Oct 11, 2012, 10:17 PM
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Jack, do you mean the LX hub or FMS hub?
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Old Oct 12, 2012, 08:13 AM
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Quote:
Originally Posted by Aros View Post
Jack, do you mean the LX hub or FMS hub?
The Lx hub. Any probs. show up with that prop assbly.? Check post #5 again...
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Old Oct 12, 2012, 10:51 AM
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Jack I wish I could remember. I haven't had it for several months (sold it out of frustration). But yes, from what I recall the design was similar but the main thing is the props were much more heavy-weight with more clearance from the cowl. Although I do think the FMS hub needs to be strengthened, I think the main problem has stemmed from a lack of clearance between the base of the hub and the cowl/dummy engine.
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Old Oct 12, 2012, 12:41 PM
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Aros -

O.K. It's in the hands of FMS now and I wish them the best to process this to the best conclusion.

This is a 'golden opportunity' to get such issues resolved for the ongoing benefit of everyone including future users, new folks to the hobby, and to the industry. This event has brought this aspect of the hobby into intense focus and I want to add what I can so that the treatment is as thorough and accurate as possible.

I can't recall an incident where one of these devices, internal combustion or electric, where the blades from the propeller were flung from the unit to become projectiles and capable of danger to those nearby like this has been.

Whether contact was there against the cowl or not, these units meed to be constructed with the objective that if such contact were to occur, a breakup like this would absolutely not be the result. Blade strikes on the outer parts are another thing - grinding forces against the hub like you're suggesting should not do this. My concern was also piqued when there began some comments of construction issues with the 1400mm range of planes. In short, if there's a pattern here with FMS, or any other maker for that matter, I wish it to be 'nipped in the bud' as one might say. It's the most opportune moment.

I don't feel like I'm overreacting. I hope I'm not.
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Old Oct 12, 2012, 12:45 PM
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Great post and I agree 100%.

I feel confident in FMS to resolve this safety issue. Their very business is at stake.
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Old Oct 27, 2012, 09:04 PM
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That was kinda awesome, purely from a visual stand point
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Old Oct 27, 2012, 09:34 PM
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Indeed!
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Old Oct 29, 2012, 10:38 AM
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Okay I received these new hub photos from FMS. All I have is the descriptions that came with them. Here they are...

"It is made of special material and it is much stronger than before. The position of screwing on the new hub is thicker and deeper."
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Old Oct 29, 2012, 07:50 PM
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definitely beefier.
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Old Nov 04, 2012, 09:09 AM
How's the wind today?
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Wow Aros!!

I am walking around with qwerty stamped on my jaw because it fell onto my keyboard after watching your video.

As with other comments, great no one was hurt.

And I must say that we are all fortunate to have great spokes-poeple such as yourself to share and act in the name of this amazing Hobby.

Thank you Sir,
Steve
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