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HomeRC & PowerAircraftHelicopterEngines Plugs Mufflers Fuel › Strange issue with new OS 50 Hyper and Align 50 pipe.
04-05-2009 09:27 PM  9 years agoPost 1
nofear

rrApprentice

Chicago - NW Suburbs, IL

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Hey Guys,

Okay so I have a new hyper 50 bolted to an Align 50 muffler.
She starts fine, idles fine and for a motor that is still being broken it she makes good power.
I am running a Quick UK header tank.

The engine runs solid and predictable until the main tank is de-pleated of fuel. As soon as the motor is using the fuel form the header tank, now with the main being empty, you can hear the motor drop in RPM and become less responsive to throttle changes.

I know its not leaning out as this would cause an increase in rpm.

Is it possible that this drop in RPM can be caused by a lower back pressure issue from the muffler once the main tank is empty?

Any help in this would be appreciated.

Thank you.

nofear.

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04-05-2009 10:46 PM  9 years agoPost 2
ludwig

rrApprentice

welkom

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first i will get rid of the align muffler. myne broke on his own and yes it did it to so it is not the os engine. I now run the 522 on my heli

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04-05-2009 11:25 PM  9 years agoPost 3
nofear

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Chicago - NW Suburbs, IL

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Yeah, I don't want to get rid of the align pipe just yet. Many guys are flying the Align pipe with no issues.
I don't believe that the pipe is causing the issue otherwise I'd see it with a full main tank too.

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04-05-2009 11:50 PM  9 years agoPost 4
GMPheli

rrElite Veteran

W. Bridgewater, MA USA

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It all has to do with the location of your header tank. If it is above the main tank, then it will richen when the main tank runs out. Below the main tank, it will lean.

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04-06-2009 01:31 AM  9 years agoPost 5
nofear

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Chicago - NW Suburbs, IL

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The header tank is exactly in line with the main tank and in line with the carb.

Ill try and post some pics of the current setup.

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04-06-2009 03:04 AM  9 years agoPost 6
GMPheli

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W. Bridgewater, MA USA

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I suspect it is because the header tank is smaller than the main tank. It is easier for the motor to pull fuel from just the header as it does not have to lift it quite as far. It is normal. Go fly!!!

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04-06-2009 03:07 AM  9 years agoPost 7
Mike Bilyk

rrApprentice

Tulsa, OK - USA

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not strange, its normal.

land when you get that low on fuel...

AMA # 617778
Team MasterCard

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04-06-2009 03:19 PM  9 years agoPost 8
nofear

rrApprentice

Chicago - NW Suburbs, IL

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I suspect it is because the header tank is smaller than the main tank. It is easier for the motor to pull fuel from just the header as it does not have to lift it quite as far. It is normal. Go fly!!!
I don't know if I believe that is normal. I have never had that problem
on any of my other birds with header tanks.

If it was normal, wouldn't I have this issue regardless of whether the main tank was full or not. If it was easier for the engine to pull fuel from only the header tank, you'd expect an increase in RPM, not a decrease.

Thanks for your responses guys. I'm not ready to accept that this is normal though.

~nf

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04-07-2009 01:07 AM  9 years agoPost 9
Raptor Pilot

rrVeteran

Northern Ireland U.K

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If it was easier for the engine to pull fuel from only the header tank, you'd expect an increase in RPM, not a decrease.
No, you will get a decrease in rpm if the engine is getting more fuel which means its running richer so the revs will drop.
nofear, i can run the main tank and the header tank empty with no increase or decrease in engine rpm apart from the last 2 or 3 seconds when the engine rpm increases slightly as it runs out of fuel.The header tank is exactly in line with the main tank and in line with the carb so its the same as your set up. I cant say why mine runs like it does and my clubmates heli runs the way you are describeing yours.

If it doesnt move and its meant too... use WD 40. If it moves and its not meant too...use duct tape!

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04-07-2009 11:38 PM  9 years agoPost 10
nofear

rrApprentice

Chicago - NW Suburbs, IL

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hmmm, you have given me something to think about.
I'm going to pull my fuel tank tonight....I want to check something...
I'll let you know what I find if it is what I think it is.

~nf

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