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HelicopterMiniature Aircraft Whiplash & Fury 55 › Fury Pro-Flex Bearings Suck
06-07-2004 12:54 AM  13 years agoPost 1
Spencer K

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Phoenix, Az

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Hi, i have a fury extreme with c-spec in it. i have gone through 2 damn starter shafts(pro-flex). the first one i had didnt have the removable tip, and the second one does. i have never hot started my heli and i make sure the wand is all the way on the heli before i attempt to start and also make sure the starter is parralel with the output shaft. then you get this ****ty scraping noise and its the ****ty bearings slipping on the shaft. Obviously MinAir knows of the problem or they wouldnt have made the new starter shaft so you can replace the bearings that get fried. Sorry but that gripes my ass!!! Anyone know how i can aviod this problem? Can i use a lube on the bearings inside? Where can i buy the replacement tips? Thanks!

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06-07-2004 02:14 AM  13 years agoPost 2
jerrythercpilot

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--South Florida --

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Switch to a hex head. "There is refinement in simplicity"

Light travels faster than sound, thats why some people appear so bright UNTIL you hear them speak.

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06-07-2004 02:43 AM  13 years agoPost 3
Spencer K

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Phoenix, Az

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anyone know where i can get the replacement tips and price? thanks

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06-07-2004 03:51 AM  13 years agoPost 4
Saint728

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Honolulu, Hawaii

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I'm sure if you write MA an e-mail asking about the part number they can help you out. You need to make sure you keep the bearing lubed all the time to avaid the bearing from crapping out on you. I use Triflow on mine.

Take Care,
Cheers, Patrick

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06-07-2004 05:43 AM  13 years agoPost 5
flmgrip

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irvine, CA, United States

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are the start adapters the same size than the pegea ? 9mm OD on the shaft, 10mm ID on the starter side ?

thanks

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06-07-2004 12:33 PM  13 years agoPost 6
looseblades

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ocean gate N.J. usa

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you cna just buy the bearing from boca for a bout 10.00 each. putting them in is easy if you have the removable tip type start shaft. i get about 2-3 year out of the proflex before the bearings go bad. make sure the motor in not hydro locking when trying to start it. also at the end of thr day flying, run the engine dry and rotate the piston to tdc. this keeps oil from puddings in the cyclinder. hope this helps ,roy.

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06-07-2004 08:27 PM  13 years agoPost 7
Spencer K

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Phoenix, Az

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thanks guys, i found the bearings for $7.50 each. Theres 2 bearings in the tip so its 15.00 everytime you fry one, which isnt that bad. Im still gonna write MA and see what i come up with as far as oiling them. Its disapointing getting all the way out to the flying field and find out that the bearings crapped out.

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06-07-2004 08:59 PM  13 years agoPost 8
looseblades

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ocean gate N.J. usa

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i know ,i carry a spare stater shaft for that reason. i am glad you were able to find the bearings. just make sure you put them in the right way or it will not lock on the clutch driver shaft. i believe the numbers go up. have a good one , roy

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06-07-2004 09:06 PM  13 years agoPost 9
rckrzy1

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Hurst Texas

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Switch to a hex head. "There is refinement in simplicity
I agree after breaking 2 with my big blocks.



Wildcat Fuels

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06-08-2004 01:01 AM  13 years agoPost 10
Spencer K

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Phoenix, Az

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if i go though another set i will probably go to hex

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06-08-2004 02:49 AM  13 years agoPost 11
DS 8717

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Here wishing i was somewhere else

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Hi, i have a fury extreme with c-spec in it. i have gone through 2 damn starter shafts(pro-flex). the first one i had didnt have the removable tip, and the second one does. i have never hot started my heli and i make sure the wand is all the way on the heli before i attempt to start and also make sure the starter is parralel with the output shaft. then you get this ****ty scraping noise and its the ****ty bearings slipping on the shaft. Obviously MinAir knows of the problem or they wouldnt have made the new starter shaft so you can replace the bearings that get fried. Sorry but that gripes my ass!!! Anyone know how i can aviod this problem? Can i use a lube on the bearings inside? Where can i buy the replacement tips? Thanks!

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

I just called min air today because i had my bearing to go out this week end. I have 2 shafts,one of the old ones without the removable end and the newer one with the screw on tip. If you send them your old one without the screw on tip they will replace it with the new assy with the screw on tip for $25. I will now have two of the newer versions with one for back up,so ican replace the bearing when they go out next time. DOUG

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06-08-2004 04:10 AM  13 years agoPost 12
Xcell_24

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Saugerties, NY

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I had absolutley no problems with mine. hundreds of starts with no maintance just slapped it on and spun it up. I guess I got a good one.

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06-08-2004 04:33 AM  13 years agoPost 13
vitek

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Corvallis, OR

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you get this ****ty scraping noise and its the ****ty bearings slipping on the shaft
Keep the tip out of the dirt and don't pull it off of the start shaft until after the starter has stopped turning. It will last longer that way.

Travis

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06-08-2004 04:49 AM  13 years agoPost 14
ronfurious

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Novi, MI

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Sorry about your pro-flex problem. I experienced the same thing. Now I keep a total of three bearing attachments, one in use and two backups.

MA says those bearings were not designed for the 90 size engines most of us use today. The rumor is a new "bigger bearing" starter adapter is in the works from MA. In the meantime, here are a few procedures that might increase the time between failures:
1) use a light oil on the bearings. ie "tri-flow".
2) place the starter all the way down as far as it will go.
3) use a spare finger, probably your thumb,from the hand that is holding the main blades to lightly (so as not to friction burn your finger) hold the flexable shaft inline with the starter shaft. In other words. Keep that shaft from whipping around from centrifical force. When viewed from the side, keep the pro-flex shaft looking like an "I". Don't let it whip into an elongated "O" shape.
4) After cranking your engine, whether it starts or not, but especially when it starts, make darn sure the pro-flex shaft completely stops turning before your either crank it again or pull the starter adapter up off the starter shaft.

Keep in mind these procedures keep the best possible alignment, minimize vibration, and insure even stress load between the bearings during the start process.

Since using these procedures I have accomplish over 50 start so far without failure on my YS91s. Before taking these starts I experienced bearing failure about once per week.

P.S. Don't lend your starter to others at the field unless they follow these procedures.

Good Luck

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06-10-2004 08:36 PM  13 years agoPost 15
Paul Woodcock

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Dubai - United Arab Emirates

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I think it is the OIL on the bearing that is the problem. Clean and dry works for me.

Paul

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06-10-2004 11:10 PM  13 years agoPost 16
looseblades

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ocean gate N.J. usa

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i will agree with that, i don not think i have ever oiled mine.

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06-10-2004 11:17 PM  13 years agoPost 17
DS 8717

rrProfessor

Here wishing i was somewhere else

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Sorry about your pro-flex problem. I experienced the same thing. Now I keep a total of three bearing attachments, one in use and two backups.

MA says those bearings were not designed for the 90 size engines most of us use today. The rumor is a new "bigger bearing" starter adapter is in the works from MA. In the meantime, here are a few procedures that might increase the time between failures:
>1) use a light oil on the bearings. ie "tri-flow".

Did it still failed

>2) place the starter all the way down as far as it will go.

Did it still failed


>3) use a spare finger, probably your thumb,from the hand that is holding the main blades to lightly (so as not to friction burn your finger) hold the flexable shaft inline with the starter shaft. In other words. Keep that shaft from whipping around from centrifical force. When viewed from the side, keep the pro-flex shaft looking like an "I". Don't let it whip into an elongated "O" shape.

Do that still failed

>4) After cranking your engine, whether it starts or not, but especially when it starts, make darn sure the pro-flex shaft completely stops turning before your either crank it again or pull the starter adapter up off the starter shaft.

Do that still failed

Also remove the glow plug and blow any oil in the engine before cranking the fist time. Still failed

On a 50 and 61 heli, ihave been through 3 flex shafts and 3 one way bearings.
keep a back up now and will replace the one way bearings when they fail now.

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06-11-2004 12:42 AM  13 years agoPost 18
flmgrip

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irvine, CA, United States

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are the start adapters the same size than the pegea ? 9mm OD on the shaft, 10mm ID on the starter side ?
would someone with the proflex answer that please

thanks

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06-11-2004 01:34 AM  13 years agoPost 19
helitroll

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Southlake, TX

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spare

I have a spare one for sale. It was used @ 5 times and is carried in my toolbox. PM if interested. Mark

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06-11-2004 07:24 AM  13 years agoPost 20
vitek

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Corvallis, OR

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would someone with the proflex answer that please
The MA one way fits on a 6mm shaft, so no.
On a 50 and 61 heli, ihave been through 3 flex shafts and 3 one way bearings.
I've been using one on a 61, 70 and 91 for about a year. No problems yet. I used a 6mm hex before and wasted several afternoons trying to seperate the shaft from my helicopter.

Travis

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HelicopterMiniature Aircraft Whiplash & Fury 55 › Fury Pro-Flex Bearings Suck
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