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HomeAircraftHelicopterEngines Plugs Mufflers Fuel › What causes over speeding when descending .
09-08-2013 09:07 PM  4 years agoPost 1
datidun

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N Ireland

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What causes this when descending flat bottom stick in idle up,this is a 50 Hyper,i can only think of two things the idle is set to lean or the the Governor is not set high enough above idle,the Csm Revlock 10 is set at 30 percent above idle so that should solve the problem and the idle needle is slightly richer than factory setting any richer and it quits,idle up head speed 2000,MP5 pipe,main needle 1 full turn 6 clicks,backplate cool,i cant find the cure,this only happens when descending,any ideas thanx.

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09-08-2013 10:14 PM  4 years agoPost 2
TMoore

rrMaster

Cookeville, TN

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The head unloads and rpm goes up. It's been a while since I messed with an RL 10. I'll look at the one I have and see if I might offer some more concrete suggestions.

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09-09-2013 01:47 AM  4 years agoPost 3
baby uh1

rrVeteran

St. James, Mo.

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I would think that if your clutch is a bit too tight it wouldn't allow the engine to decouple and then be over driven by the head.

Anything is possible if you don't know what you are talking about!

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09-09-2013 09:19 AM  4 years agoPost 4
datidun

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N Ireland

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Clutch seems to be ok,it does not grab at idle,spools up when it should.

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09-13-2013 01:24 PM  4 years agoPost 5
Richardmid1

rrProfessor

Leeds, England

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It could just be the head you are hearing over speed?

If you can adjust the minimum the governor shuts the throttle try going lower.

With the Align governor it will shut it all the way to idle if it needs to.

60% of the time, it works every time!

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09-13-2013 04:24 PM  4 years agoPost 6
ticedoff8

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Morgan Hill, CA. USA

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It is the same effect as an auto-rotation.

As you are descending, the forces that allow the heli to preform an auto-rotation drive the head instead of the engine.

If you practice your autos much (with the engine at idle), you can get the head to speed up quite a bit in the approach, and the convert all that extra head speed into a longer hover or extra maneuvers (like flips and rolls) on the approach.

If you fly with a gov, the gov should close the throttle as required to try to keep the head speed down - but it can only go so far (idle is the lower limit, and then you still have the clutch and the 1-way bearing that is de-coupling the engine from the head).

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09-13-2013 04:30 PM  4 years agoPost 7
Richardmid1

rrProfessor

Leeds, England

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You can always go knife edge to decend like a tail slide maybe.

60% of the time, it works every time!

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09-13-2013 06:55 PM  4 years agoPost 8
dkshema

rrMaster

Cedar Rapids, IA

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Death Spiral would be fun, too.

-----
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* Making the World Better -- One Helicopter at a time! *

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09-13-2013 08:31 PM  4 years agoPost 9
datidun

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N Ireland

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I had a chat with CSM themselves,i followed there instructions as to why this is happening,i had the Gov set to 30 percent above idle that some do on the Revlock Governors,according to them i should change that to idle point when going through calibration,now the next step was interesting,on the OS 50 Hyper there are 3 lines or marks on the Carb barrel,on the middle line thats were the Carb is half open,thats were i had it set to 90 degrees half stick,i was told to reset that to around the first marking on the Carb barrel,in other words half stick the carb would not be half open but slightly below,i reset everything again and there is no overspeeding,also today there was one guy flying the hyper 50,the Carb also set half stick on the middle line marked on the Carb without a Governor and the engine was screaming its head off well over 2000 at three quarter stick,and the normal curves were perfect 10.50.100,looks like that engine has to much Grunt on the middle marking which is suppose to indicate half open throttle

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