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HomeAircraftHelicopterFuel-Helicopters New or Limited ActivityAirstar › Has anyone had a tail drive belt snap on a Jetcopter?
12-04-2012 07:08 PM  5 years agoPost 1
Rajun151

rrApprentice

Sugar Land, TX

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With well under 10 hours of flight time since new, I had the belt on my Jetcopter SX snap yesterday during (obviously) the final flight..

https://rc.runryder.com/rr/rrpv.htm...6/&IN=1&a=0&s=0

Of course, this never happens when we'd appreciate it most.. I was coming back towards the open field, above trees when it started wildly piro'ing.. It was obvious the tail was gone so I started to climb to an altitude that would give me a better chance for a successful auto, however as I climbed higher above the other trees, the wind speed increased substantially, pushing me exactly where I didn't need to go.. I shut the turbine down and did the best auto I could between two trees and over a brick and steel fence.. Having to get into the collective early to miss the fence ate up a bit too much head speed.. It didn't help I was only a minute or so into the flight and still considerably heavy with all the fuel..

Obvious damage: Main 800mm Rotortech's (the last Century could find in stock of the solid black), landing gear, front tray frame (bent - possibly correctable), tail boom (got whacked by one of the blades), spindle, possibly main shaft, and related.. Turbine starts up and runs up to full power fine with the head removed.. The landing gear probably helped protect it as it pancaked out.. Could have been much worse...

That all being said... In the past, I've had belts fray over time, but I've only had one snap in a wreck. This heli has been flown gently with almost no aerobatics.. I am unable to find what might have caused it thus far. Any thoughts/ideas would be appreciated.

Thanks,
David

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12-04-2012 10:26 PM  5 years agoPost 2
Twrecks600

rrKey Veteran

Round Rock, Texas

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You let a guy named Ralph fly it and the heli got scared. It just took a few more flights for it to fall apart

Team me

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12-06-2012 02:28 PM  5 years agoPost 3
kevin39307

rrApprentice

meridian,mississippi

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seems to me that maybe the belt was to tight and snapped from stress. i always leave a little slack to relieve tention on belt.

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12-07-2012 08:21 PM  5 years agoPost 4
Rajun151

rrApprentice

Sugar Land, TX

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Hi Kevin,
I regularly check the tension of the belts on both my Mongoose and the Jetcopter and they've always been in the normal range as far as tension goes.
Thanks,
David

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12-09-2012 04:54 AM  5 years agoPost 5
kevin39307

rrApprentice

meridian,mississippi

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well i guess you got a bad belt which rarely happens. that sucks.

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12-09-2012 08:45 PM  5 years agoPost 6
BobOD

rrElite Veteran

New York- USA

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The most common failure mode of belts with steel tension members is fatigue. Likely not so related to load or tension. Give Brecoflex a call and ask them what the life should be...they are very helpful.
Give them the size of the pulleys and speed they are going at. This determines the amount of flex the belt is going through and the number of times it's being flexed. Include any flat face idlers as well. The smaller the pulley diameters, the more the tension cords are being flexed.

http://www.brecoflex.com/index.php?...ATID=1&SMENID=1
Tel. 732-460-9500

Bob

Team POP Secret

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12-10-2012 06:22 PM  5 years agoPost 7
Rajun151

rrApprentice

Sugar Land, TX

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Thanks a lot for the information, Bob. Will do!

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