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HelicopterMain Discussion › Why don't more people use uniflow?
12-01-2005 08:48 PM  12 years agoPost 1
Louisiana Helicam

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West Monroe, LA

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For all of those using pumps/crankcase pressure, this thread doesn't apply but why isn't uniflow more popular? Like many, I was skeptical at first but I've used this setup with a header tank on my last two helicopters and my mixtures stay consistent from top to bottom. I'll never go back to standard plumbing unless I use a pump at some point. I just can't convince more pilots to try it though. They'll say, "I don't know about that" or, "The manual doesn't say to do that." But, they always comment on how well-tuned and consistent my engine is while they continue to have consistency issues. I do use a Revmax, which also helps, but my Hyper's sensitivity and temperature feels and stays the same from the top of the tank to the bottom. I give it a good intermediate workout (loops, rolls, tic-tocs, etc.) and haven't found a flaw anywhere in uniflowing other than a fueling procedure that involves a couple of extra steps. What's the big deal though? Why are so many closed off to the idea?

www.louisianahelicam.com

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12-01-2005 08:54 PM  12 years agoPost 2
FLYINFOOL

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Cudahy, WI

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Most people do not even know what uniflow is, let alone understand how or why it works.
If people cannot understand the how or why then they will also not want to deal with the "couple of extra steps".


Jeff Borowski
RAMS Club President
www.ramsrcclub.com

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12-01-2005 08:58 PM  12 years agoPost 3
Louisiana Helicam

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West Monroe, LA

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I guess Nigel Fraser Ker's explanation is too much for some to wrap their brains around. All I know is that I have yet to see a setup in which it didn't work if done properly.

www.louisianahelicam.com

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12-01-2005 09:17 PM  12 years agoPost 4
Wa11banger

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Huntsville, Al

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Some of us already have flawless setups that run without any modification. None of my YS's need it.

In my experience Uniflow was to fix a delivery problem.. Why fix something that for most everyone is not broken.

Rick

Proud member of the Quick UK, Duralite Flight Systems, V-Blade, & KBDD team

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12-01-2005 09:22 PM  12 years agoPost 5
Leif

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USA

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For the smaller helis, it's also a royal pain to retrofit the tank for the extra clunk line.

If there was a good reliable tank retrofit documented more people would probably try it.

Leif

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12-01-2005 09:23 PM  12 years agoPost 6
Louisiana Helicam

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West Monroe, LA

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Wallbanger...Does yours use a pump?

www.louisianahelicam.com

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12-01-2005 09:34 PM  12 years agoPost 7
Wa11banger

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Huntsville, Al

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No sir all the big block YS's are crank case pressure.. Basically a pump but with no added complexity or tweaking issues. But even when I was flying 32's - 50's I never had a consistency problem. I do know of some that did and uniflow or a rebuild fixed their problem, just some people dont have an actual need to plumb their machines the uniflow way.

I know you say you are having a difficult time helping people adopt uniflow but for as many systems as it help it has also created even bigger headaches.. More plumbing means more headache. For quite a while there was post after post from very knowlegeable people on doing the uniflow setup but it was causing severe problems for those who did not grasp the idea or had airframes that were difficult at best to outfit in that way.

Rick

Proud member of the Quick UK, Duralite Flight Systems, V-Blade, & KBDD team

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12-01-2005 09:36 PM  12 years agoPost 8
ESWLFSE

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Liberty Hill, TX

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I'd say nobody does it because it makes it a PITA to fill.

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12-01-2005 09:52 PM  12 years agoPost 9
rotor- shark

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uk

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the problem is that it's a pita to try to fit the extra clunk line in the main tank if it didn't require an extra clunk i think everybody would do it.

all comments are my opinion only!

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12-01-2005 10:16 PM  12 years agoPost 10
airdodger

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Johnston USA

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http://www.curtisyoungblood.com/faq...ory=Fuel system Question 822, read the answer. Chris

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12-01-2005 11:25 PM  12 years agoPost 11
Louisiana Helicam

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West Monroe, LA

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I've read that on Curtis' site before. I've A/Bed the two setups and don't see any power difference between the two so that is also setup-dependent. I also agree that not every machine needs it. The guys that I'm referring to would really benefit from it though.

www.louisianahelicam.com

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12-02-2005 12:39 AM  12 years agoPost 12
Nitrohuffer

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Bloomingburg,NY

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I got a tank that was set with the uniflow. It's easy to fill, just block the fuel to the carb, take off the header input line to vent and fill from the T. Runs great, but then again my non uni-flow runs great too.

Lungs transformed to take in water.

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12-02-2005 02:15 AM  12 years agoPost 13
dkshema

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Cedar Rapids, IA

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...but then again my non uni-flow runs great too
For the majority of flyers, I believe that quote says it all, and the extra effort doesn't buy much in return over what most are using with little or no trouble already.

Dave

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12-02-2005 02:20 AM  12 years agoPost 14
Nitrohuffer

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Bloomingburg,NY

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Yeah but I have three lines coming off my header tank so it looks like it makes a difference

Lungs transformed to take in water.

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12-02-2005 02:43 AM  12 years agoPost 15
B.Hofferth

rrApprentice

walkerton in.

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uniflow

yes the uniflow has worked wonders for my tt39, this thing makes great power and runs the same from full to empty. i did the modification to my tt50 just to try and it did not respond as well, it wanted to lean out. brian.

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12-02-2005 12:32 PM  12 years agoPost 16
RayJayJohnsonJr

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Midwest

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Uniflow=Snake oil

-Mark

There, their and they're. It's really that simple.

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12-02-2005 02:14 PM  12 years agoPost 17
ChristianM

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Oslo, Norway

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The uniflow works great for engines with low exhaust pressure such as the MP2. The lower the tank pressure, the larger the negative effect of the change in the hydrostatic pressure as the fuel is used will be. So for a YS that uses the crank cases pressure it will have no noticeable effect, but on my Raptor with OS50 Hyper and MP2 it made a significant improvement. Here is a link to how uniflow works.

Here is a picture of my Raptor with a uniflow system. Notice the vent line connected to the blind nipple on the header tank. I just take it off when I fill the tank, no big deal

Christian

Burn fuel, be happy

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12-02-2005 02:17 PM  12 years agoPost 18
Jeff H

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Cincinnati, OH

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Uniflow=Snake oil
Typical uneducated comment from someone who hasn't tried it...

I did use it for a while on my Evo 50. That huge tank would lean out twards the last quarter tank. The Uni-flow stopped that and provided consistant mixture from the beginning to the end of the tank.

Fueling was a PITA and I had to be careful to clamp off the exhaust as soon as I landed or the fuel would pump back into the header of the MPII and flood the engine when I tried to restart it.

After my last crash that destroyed the tank, I decided not to put the uni-flow back in. I just land a 1/4 tank now.

If I change the muffler someday to one with a pressure tap somewhere else other than the header, I might go back to the uni-flow


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12-02-2005 02:21 PM  12 years agoPost 19
Wa11banger

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Huntsville, Al

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I am very surprised you needed to go uniflow with a Hyper and MP2. Robroy has 2 of them and I had one of them that ran like lions without needing that setup. But then again Rob was born with the natural talent of being an excellent engine tuner.. Anyone have any guages that are small enough in increment to read what different engine/pipe combinations are putting out for pressure?

Rick

Proud member of the Quick UK, Duralite Flight Systems, V-Blade, & KBDD team

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12-02-2005 03:07 PM  12 years agoPost 20
the collective

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Bayside, NY, U.S.A

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Uniflow=Snake oil
Markerbeacon = guy who didn't pay attention in physics class

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HelicopterMain Discussion › Why don't more people use uniflow?
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