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HomeRC & PowerAircraftHelicopterEngines Plugs Mufflers Fuel › Uniflow fuel system !!
02-02-2013 01:40 PM  5 years agoPost 21
RogerRabbit62

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Thuerigen germany

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Just changed my Helitrainer to uniflow.
The setting and tanking is not complex.

It is two clamps while tanking.
Two tanklines.
I put the line from the fuelpump and the line back to the fuelingstation in and then you can run the fuelpump until the fuel comes back to the filling station.
Afterwards i just put a small silicon fuel tube between the two and remove the clamps.
Takes no longer then the normal tanking.

Cant tell to much, just modded it.
I will see if the leaning on inverted is away now.

The uniflow has the other advantage also, that the position of the tank relative to the carburator is irrelevant.
That is -from my point- more important than the fact of the removal of the relevance of the amount of fuel.
Especially on helis where tank and carburator are not about the same heigh.

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02-02-2013 02:26 PM  5 years agoPost 22
KevinB

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Earth

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+1 G-Limo

As stated above, you can't put a one-way in the pressure line unless you have an 'on-demand' style carb. ( YS or OS-DRS ).

If you have that style of carb, you might as well avoid the exhaust system altogether and use a one-way and the crankcase pressure. Then you aren't filling your tank with exhaust gas and it's much easier on the fuel line material.

KevinB

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02-02-2013 02:28 PM  5 years agoPost 23
helixangle

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Mamaroneck, NY - USA

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they make no pressure check valves
A free flow check valve, no pressure build in the line necessary to open, yet directional preventing pressure / fuel back flowing to the muffler

Be sure the juice is worth the sqweeze
Remember life is hard...even harder for stupid people

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02-02-2013 03:10 PM  5 years agoPost 24
G-Limo

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Europe

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they make no pressure check valves
Maybe they do! but with no regulator, if the tank pressure can't bleed off on tickover, the engine may flood.

/Limo

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02-02-2013 03:19 PM  5 years agoPost 25
helixangle

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Mamaroneck, NY - USA

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agreed...however i have yet to experience an open pipe as a sealed vessel
think of the stinger as the blast gate on a turbo

Be sure the juice is worth the sqweeze
Remember life is hard...even harder for stupid people

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02-02-2013 03:24 PM  5 years agoPost 26
Zaneman007

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Texas - USA

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Thanks for the clarification
The benefit comes as the fuel is burnt. The less fuel weight pushing against the muffler pressure entering the tank, the more effect the muffler pressure has on the fuel tank pressure. So the fuel pressure at the carb sort of "balances out" as the tank empties.
That makes sense.

Old Guys Rule!

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02-02-2013 06:41 PM  5 years agoPost 27
ICUR1-2

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Ottawa, Ontario

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so if I was to tap the backplate and install a check valve would that work on a non regulated carb ?

spending time, paying attention

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02-02-2013 09:14 PM  5 years agoPost 28
KevinB

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Earth

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No ICUR1-2. It would not work.

It would flood the engine out quite quickly. The fuel tank pressure when using a check valve off of crankcase pressure is considerably higher than just muffler pressure.

KevinB

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02-03-2013 07:01 PM  5 years agoPost 29
darren heaver

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rochester, kent, england.

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Flew the heli today done 2 tanks, I had to richen up idle and main needle a bit but other than that no probs te engine has telemetery and was at 105 deg give or take from lift off till end of tank so no leaning out at end of flight so it's uniflow for me I set down a couple of times to adjust settings and had no noticeable change in tick over or bogging down on lift off.
I fitted a vent pipe from top of tank and just fitted pipe clamp to it and opened it on landing at end of flight to relieve pressure so no muffler feed clamp was required.

I will be using it on my nitro's from now on

" one day I will learn to fly till then I will just hover"

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02-03-2013 08:20 PM  5 years agoPost 30
helixangle

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Mamaroneck, NY - USA

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you know I have to ask a question.

where is the vent pipe coming from?

Be sure the juice is worth the sqweeze
Remember life is hard...even harder for stupid people

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02-03-2013 08:54 PM  5 years agoPost 31
darren heaver

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rochester, kent, england.

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It's the original vent pipe from top of tank as I put another bunk into the tank for the feed from muffler via a clunk. I used a quick uk header tank bung and rubber it works great just put a pipe clamp on that vent pipe and open after flight.

" one day I will learn to fly till then I will just hover"

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02-03-2013 09:18 PM  5 years agoPost 32
helixangle

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Mamaroneck, NY - USA

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cool, have to try

Be sure the juice is worth the sqweeze
Remember life is hard...even harder for stupid people

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02-03-2013 09:21 PM  5 years agoPost 33
darren heaver

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rochester, kent, england.

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Just use a tank bung and rubber trex or the like mine was on a trex 600 and all done with tank institu all re plumbed in about 15 mins from start to finish

Good luck !!

" one day I will learn to fly till then I will just hover"

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02-04-2013 09:10 AM  5 years agoPost 34
RogerRabbit62

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Thuerigen germany

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Tested the uniflow on the 700 Heli trainer yesterday.

Very constant exhaust smoke from beginning to the last drop.

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02-04-2013 02:07 PM  5 years agoPost 35
darren heaver

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rochester, kent, england.

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Good I'm glad it worked for you as we'll why don't more people use this system it seems to of been tried years ago then people gave it a wide berth

" one day I will learn to fly till then I will just hover"

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02-04-2013 03:03 PM  5 years agoPost 36
RogerRabbit62

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Thuerigen germany

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There are two things which are more "complicated" than on ordinary systems.
If you shut off the engine without opening the filling line the overpreassure from the tank will feed the fuel into the muffler if the carburator is closed.
If you forget and the tank is not empty it will continue flowing at least if the carburator is not fully closed.

You need two clamps while tanking.

But i found out, if the vent line is open the fuel does not press towards the muffler.
So it is a minor and safety issue to use them.

But all that is nothing compared to the effort you have on replacing a leaned out engine.

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HomeRC & PowerAircraftHelicopterEngines Plugs Mufflers Fuel › Uniflow fuel system !!
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