Raygun
Moderator 
FIRST 30 MEMBER
The needs of the many out weigh the needs of the few
Posts: 1,567
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Post by Raygun on Apr 12, 2011 14:07:37 GMT -6
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akent
Moderator
FIRST 30 MEMBER
I love the 500!
Posts: 2,826
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Post by akent on Apr 12, 2011 18:28:24 GMT -6
Man, that is really sad...
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McKrackin
First 30 Member 
First 30 Member
Flippin' the bird!
Posts: 3,720
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Post by McKrackin on Apr 12, 2011 23:36:18 GMT -6
Ouch.Posted my best wishes.
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Post by Gabe on Apr 13, 2011 4:27:56 GMT -6
Oh wow. I've always been sketchy about that happening. I hate spoiling those things up on the bench.
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19000rpm
Moderator
FIRST 30 MEMBER
Posts: 5,183
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Post by 19000rpm on Apr 14, 2011 6:19:44 GMT -6
I feel really bad for the guy.
I had one blow up on me last year. The plane was in the air. Glad it wasn't in my face. That got me thinking.
A properly balanced fan should not blow up unless it's been damaged or it is defective. Although, in this case, it looks like the fan housing may not have been properly designed.
Plastic fans are the most likely to be damaged or defective as opposed to the aluminum ones that come at a premium but are much stronger.
It's a good idea to inspect the plastic fans after every flight. If it's a belly lander it's not unusual to find chips in the fan from sucking up debris.
Since my incident with the one that blew up last year, I don't bench test them under power unless they are in the fuse and I'm a good 4 ft. behind the plane. At least if it blows up in the fuse the foam will help to absorb the explosion.
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shakey
BRONZE MEMBER
Posts: 203
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Post by shakey on Apr 16, 2011 18:49:27 GMT -6
You would think that a fan that is designed to spin at those speeds, would be built a little sturdier than that. I realize it's a hobby part but at those speeds there's no excuse for cheaply made items. Parts can be replaced but not human artifacts. I really hope he gets his sight back, and glad for him it wasn't worse than that.
Can't ever be too safe!!!
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Post by Gabe on Apr 17, 2011 7:34:30 GMT -6
My second EDF was from Nitro planes and was advertised as Ready to Fly. I stuck on the wings and plugged in the servos and that was it. Shortly after takeoff there was a loud "boom" and the plane spiraled to the ground. Amongst the wreckage I was able to see pieces of the fan blades lodged into the fuse.
Nitro planes told me it was my responsibility to open the hatch on the bottom of the plane and inspect the shroud to ensure the fan wasn't touching it. If it was, I would need to purchase a balancer and remove the blades and sand down the blades and or shroud: on an RTF plane!
I told them to go pound sand and bought the PZ Habu. Never had a problem with it.
Moral of the story is YES, companies make crappy products that spin at 20-30,000 rpms and blow up every now and then at our risk. All to turn a quick $$$.
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