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HomeAircraftHelicopterMiniature Aircraft Whiplash & Fury 55 › difficult starting when cold
01-02-2013 01:02 AM  5 years agoPost 1
CF1

rrApprentice

Olympia, WA

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On my first start of the day on my nitro I whippy I have a heck of a time getting the starter to catch. I hit my starter and the motor will turn two or three timed before the starter shaft breaks free and spins. If I open the carb all the way up or pull the glow plug I can great it to catch and turn over for a minute or so then its fine. Is this normal or is there something in can do about it?

Thanks,
Chris

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01-02-2013 01:16 AM  5 years agoPost 2
FLYERCLD

rrVeteran

Proctor, Arkansas

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What starter setup and engine.

MA Whiplash Nitro
Avant Aurora X2
OS 91 HZ
YS120
VBAR BlueLine
DX18
AMA L504443

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01-02-2013 01:25 AM  5 years agoPost 3
CF1

rrApprentice

Olympia, WA

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I'm running an OS .91 hz and using a dynatron starter with 18v makita battery on a finer edge fitting and Sullivan starter shaft.

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01-02-2013 04:00 AM  5 years agoPost 4
hyflyr

rrApprentice

Baton Rouge, LA

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difficult starting when cold
That starter setup is very powerful and if the engine is loaded up something is going to turn. Problem is the engine is not what is turning. I would suggest to be sure to kill your engine and let it run dry with a fuel line clamp at the end of each flight and not the radio. This will reduce the chance of your engine holding fuel and preventing this problem. Also at the end of the day burn out the fuel by resarting the engine with the fuel line clamp closed.

Scott

Scott

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01-02-2013 05:34 AM  5 years agoPost 5
CF1

rrApprentice

Olympia, WA

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I run it empty after each flying session and the Heli is kept in the house. When I first crank the engine it will have no fuel in it yet.

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01-02-2013 07:12 AM  5 years agoPost 6
hyflyr

rrApprentice

Baton Rouge, LA

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difficult starting when cold
Not sure I understand your issue. Is the "starter shaft breaks free and spins" the start shaft of the mechanic on the heli or the Sullivan starter shaft? Neither one should break free. I have seen the engine fan break loose and spin on the motor shaft if not secured properly. Please clarify what is spinning.

Scott

Scott

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01-02-2013 07:16 AM  5 years agoPost 7
CF1

rrApprentice

Olympia, WA

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The starter will continue to spin the starter shaft in the Heli but the motor is not turning over. I'm assuming the owb in the clutch is not grabbing the starter shaft.

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01-02-2013 12:49 PM  5 years agoPost 8
geomecc

rrKey Veteran

Long Island ,NY

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ur one way bearing is on its way out. if possible pull the glo plug and spin the engine a bit then try it. sometimes the fuel settles in the bottom of the engine and as u crank when it's cold it sorta hydrostatic locks up the engine especially being that the alcohol in the fuel evaporated and thickens up. when u r done flying pinch off the fuel line open the throttle all way and crank the engine a bit ( without powering the glo plug) that will blow out the extra fuel. if you are using the min air flex starter you can replace just the one way bearing from a bearing specialist online for cheaper than buying a replacment tip and quicker than sending it in for replacment. I got mine from
vxb.com

R I P Roman Jr. Team SKOOKUM SRW EFC

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01-02-2013 05:18 PM  5 years agoPost 9
CF1

rrApprentice

Olympia, WA

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I hope it's not. I only have about 7 or 8 flights on this model. I'm curious what you are lubing this bearing with? When I got a TRex700 a few years ago that bearing would slip if you put grease on it like the manual called for. If you used Tri-Flo it would never slip. When I assembled my Whippy I used some Tri-Flo on it. I could pull it and try a different lubricant if it would help.

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01-02-2013 07:08 PM  5 years agoPost 10
hyflyr

rrApprentice

Baton Rouge, LA

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difficult starting when cold
I doubt the one-way in the clutch is not grabbing. It is possible but I have gone thru a couple different motors and had some hard to start ones and that bearing has been fine. I did have a problem with a fan hub slipping. The guys at MA were great and sent me a new one with a press fit and that did the trick. Watch the fan hub closely when this happens and see if the fan is turning but the engine is not. You may be surprised to see the fan slipping.

Scott

Scott

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01-02-2013 11:45 PM  5 years agoPost 11
CF1

rrApprentice

Olympia, WA

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Nope fan isn't turning. I did notice the starter shaft had some up-down play so I'll take the starter cup of and pull it up. See if that helps. I'll also dunk the clutch in acetone to get all the old oil out and start over. Tri-flo on thge one easy again? I know some use atf.

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01-03-2013 12:07 AM  5 years agoPost 12
FLYERCLD

rrVeteran

Proctor, Arkansas

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One of my friends had the same problem, his was the start shaft bearing (one way) before you take your heli apart try lubing your Sullivan one way bearing.

Charles

MA Whiplash Nitro
Avant Aurora X2
OS 91 HZ
YS120
VBAR BlueLine
DX18
AMA L504443

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01-03-2013 05:03 PM  5 years agoPost 13
CF1

rrApprentice

Olympia, WA

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Found the problem. Starter shaft end is slipping on the shaft. I noticed I had some up/down play at the starter adaptor. Took it all apart and the end of the starter shaft is a separate part from the shaft. It had moved down on the shaft and is slipping on the shaft. I put it in my vice and it moved back up the shaft w/o too much effort. Poor design to be two part I think. Guess I'm down for a few days while I get a new one in.

Thanks for all the suggestions everyone!

-Chris

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01-04-2013 04:04 AM  5 years agoPost 14
hyflyr

rrApprentice

Baton Rouge, LA

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difficult starting when cold
Glad you have figured out.

Scott

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