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HomeRC & Power✈️Aircraft🚁HelicopterEngines Plugs Mufflers Fuel › new YS 50 owner with ???/
04-02-2010 03:08 AM  10 years ago
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wurthless

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Redding Ca.

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new YS 50 owner with ???/
so I thought the YS fuel system was a diaphram pump that actually pumps fuel,,,but it's not. It seems to pressurize the fuel tank same as the exhaust pressure system does,just uses crankcase pressure instead,
???? one;
why is this better? (guessing exhaust fumes are not good for things verses cleaner air pressure from motor, and prolly higher pressure from crankcase)
is it true we do not run a header tank with this motor?
??? two :
how do ya keep the air outta the fuel line when flipping with a 1/4 tanks if ya don't have a header tank? thanks for the help
QUICK! ,,,can someone turn the gravity off for just a second,,,,
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04-02-2010 08:08 AM  10 years ago
DS 8717

rrProfessor

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The YS needs more pressure than muffler will supply. I use an OS bubbleless clunk and no header tanks on all my heli's,it sucks all the fuel out of the tank like a fuel magnet but the bad side effects of the fuel magnet...YOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED
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04-02-2010 08:49 AM  10 years ago
alfred

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Australia, New South Wales, Mid North Coast

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so I thought the YS fuel system was a diaphram pump that actually pumps fuel,,,but it's not. It seems to pressurize the fuel tank same as the exhaust pressure system does,just uses crankcase pressure instead,
???? one;
Correct
But it's a bit more complicated then that. The YS runs a diaphram system which regulates the over-pressurized fuel from the tank.
The idle behaves just like any other idle, but once above that point, the diaphram comes in for regulation.
why is this better? (guessing exhaust fumes are not good for things verses cleaner air pressure from motor, and prolly higher pressure from crankcase)
The regulator always uses just a minimum of available pressure. So any variation of pressure due to rpm have no effect. It is a very good system but also quite complicated and requires absolute clean fuel. It either runs 100% consistent or is a major pain in the neck.
is it true we do not run a header tank with this motor?
??? two :
Yes, it's true.....a header tank will just give you additional fuel with the added complication and increased possibilities of problem that comes with the additional plumbing. Most of today's helies have rather large tanks and this has become more or less unnecessary.
how do ya keep the air outta the fuel line when flipping with a 1/4 tanks if ya don't have a header tank? thanks for the help
From experience, this has never been an issue. Why?
Good question....the diaphragm has a small chamber, maybe that's where it stores fuel which overcomes the momentary loss of supply?
As I said, in real world operation, it has never shown to have some negative effect. That's using YS50's to YS90's. My RJX50 came with a headertank as standard and I ended up taking it off, as the plumbing is already complicated enough and showed no benefit.
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04-02-2010 04:12 PM  10 years ago
wurthless

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thanks for the info,,,I learned allot from your postQUICK! ,,,can someone turn the gravity off for just a second,,,,
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04-02-2010 05:29 PM  10 years ago
Jgatorman

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Birmingham, AL

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+1 nice post alfred
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04-02-2010 07:19 PM  10 years ago
DS 8717

rrProfessor

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One thing about the YS is if the piston ring doesnt seal good it will cause the regulator to work erratic,and the motor will run lean. The regulator works against the tank pressure,if there isnt enough pressure in the tank it will run lean.YOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED
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04-03-2010 12:20 AM  10 years ago
wurthless

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putting a new ring in before I fly it,,,,,,thanks again !!!!!!!!!!!QUICK! ,,,can someone turn the gravity off for just a second,,,,
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04-06-2010 05:20 AM  10 years ago
wurthless

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Redding Ca.

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got another question,,,the book says you need to bleed the pressure off the tank from the line with the check valve on it,,,the go to the other line to fill it,,,Why? can you not just fill it from between the check valve and tank after you relive the pressure? ThanksQUICK! ,,,can someone turn the gravity off for just a second,,,,
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04-06-2010 05:55 AM  10 years ago
heliguy

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Boulder, CO

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The check valve is normally attached to the top of the tank, or vent line, which must be open when you pump fuel into the tank to let the air in the tank out.

Al
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04-06-2010 04:46 PM  10 years ago
wurthless

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ok I understand that,,,but can I put a T there between the check valve and tank and fill from there after the pressure is released? ThanksQUICK! ,,,can someone turn the gravity off for just a second,,,,
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04-06-2010 04:49 PM  10 years ago
DS 8717

rrProfessor

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the tank has to be vented to fill it up,if you try to do that without venting the tank it wont fill........YOU ONLY LIVE ONCE..IF YOU LIVE IT RIGHT THATS ALL YOU NEED
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04-06-2010 07:55 PM  10 years ago
AWittleWabbit

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O.C., CA

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You'll need two tees. One between the check valve and tank for venting. Also you will need a tee between the tank and Carb to fill.Heli-itis sufferer.
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04-06-2010 07:58 PM  10 years ago
AWittleWabbit

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O.C., CA

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http://www.heliproz.com/Templatericks.htm

This should explain it better.
Heli-itis sufferer.
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04-07-2010 06:29 AM  10 years ago
wurthless

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Redding Ca.

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I see how they have it set up,,,,thanks for the picQUICK! ,,,can someone turn the gravity off for just a second,,,,
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04-08-2010 05:19 PM  10 years ago
wurthless

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Redding Ca.

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my question was why not fill it from the tee in the line between the check valve and tank (vent),,I got my answer today when I tried it....the system is closed with no way to vent the pressure while filling if you don't have BOTH tee's open and fill from the tee on the clunk allowing air to go out the top of the tank,,,learning is doing I guess,,,QUICK! ,,,can someone turn the gravity off for just a second,,,,
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HomeRC & Power✈️Aircraft🚁HelicopterEngines Plugs Mufflers Fuel › new YS 50 owner with ???/
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