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HelicopterMain Discussion › Why does my Heli keep hot starting???
05-01-2004 05:07 AM  13 years agoPost 21
BigBobby

rrApprentice

Yass NSW Australia

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All of my engines are bad hot starters. If left to cool, they fire up straight away at idle and stay there perfectly. If trying to start after a quick refuel and the engine has time to heat soak, they can be a real pain.
My advice, fly, land, have a chat then refuel and fly again. You may get less flights per hour but your brain needs time to relax. There are some references in teaching texts about this. Flying one flight after another will end in brain fade and broken bits.

A few helis, this and that

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05-03-2004 10:30 AM  13 years agoPost 22
cjw

rrVeteran

UK - Cheshire

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Just a thought....

I recently had similar problem with my OS91. Turned out to be a leak in the fuel line inside the tank. She started but the engine would immediately go lean at idle. Replaced the in-tank fuel line and all is now OK.

Could be that

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05-03-2004 02:53 PM  13 years agoPost 23
rgm440

rrApprentice

Toledo Bend Lake, La.

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Try this

Next time you shut down the engine, try tilting your heli and see if excess fuel runs out of the exhaust. What is the angle of the exhaust pipe?? It should not hold excess fuel after running. Some droplets of oil leaking out should be normal, but not fuel. Good luck -- Ron

It's fun to be crazy

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05-03-2004 05:01 PM  13 years agoPost 24
comet

rrVeteran

Neuilly sur Seine, Fr

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if there is much fuel to be ignitited on start, there should be some air too to make a hot start mixture...

SO you may want to try to check this air leak again
and/or richen your low needle valve

Let us know

VT "slow&low"

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05-03-2004 09:25 PM  13 years agoPost 25
heligoole

rrKey Veteran

yorkshire,uk

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not sure but could be_
partially blocked filter(if you use one)
glow plug(try a hotter one)
feedback from muffler to fuel tank.ie sh1t in fuel.(fit a filter here..curtis youngbloods book on q and answers..this one)
the main engine probs ive had(with os 32)have been crap in filters...check em out real good..last time i missed ..i ended up doing a forced auto(i'd never done one before)luckily i was low enough to just add collective as ground approached...i escaped with heli in tact..recently fitted larger skids to help with tricky landings.

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05-04-2004 12:54 AM  13 years agoPost 26
sixeven

rrApprentice

Ft. Myers Florida

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Not that this is helpful, but my OS32 did something very similar when I first got it.

The engine was warm from a previous flight. I started it with only a small amount of trouble. (a few starter spins more than usual). It was idling nice and steady... so I let go of the head...The engine goes almost full throttle with the blades and flybar getting broken and bent against my leg (felt GREAT!).

And NO the transmitter didn't get touched and NO the throttle servo didn't move or twitch. In fact after my clutch failed and the engine continued to scream away I looked at the throttle arm only to notice it was nearly CLOSED.

I never have found an acceptable answer for why it happened. Fortunately it hasn't happened since!

SiXeVeN

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05-04-2004 01:06 AM  13 years agoPost 27
mikefoy6

rrApprentice

Thief River Falls, MN

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i flew almost 3/4 of a gallon on sunday, i did some testing and found that if i just waited 15 min in between my flights it stopped hot starting. it seems that if the engine is hot it will do it but if it is cool it wont.

strange, but at least ifound a way around it (thanks bigbobby)

mike

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05-04-2004 04:21 AM  13 years agoPost 28
BigBobby

rrApprentice

Yass NSW Australia

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No worries.
One thing you learn about the outback is how to handle heat problems.

A few helis, this and that

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05-04-2004 01:28 PM  13 years agoPost 29
rgm440

rrApprentice

Toledo Bend Lake, La.

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Good

There again I believe the excess fuel in the engine is flashed off while the engine is cooling down. There again everyone has primed an engine befor and seen it run until the fuel is gone,and revs up more as the fuel runs out, even when the fuel line is disconnected. Glad your problem has been solved, and a good few minutes break after a flight is allways nice for most of us anyway. Have a great one --- Ron

It's fun to be crazy

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HelicopterMain Discussion › Why does my Heli keep hot starting???
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