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HelicopterEngines Plugs Mufflers Fuel › R90 SE uniflow tank setup
11-27-2007 11:18 AM  9 years agoPost 1
Kader

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Czech Republic

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Hello, Have you some experience with uniflow tank system setup on R90 with OS 91 SZH (no pump)?
1.Is this system actually such favourable ?
2.Where is the best place for next input for pressure of muffler?

Best regard Jan

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11-27-2007 05:02 PM  9 years agoPost 2
spog

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Ontario, Canada

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1)The uniflow tank setup does make a noticeable difference, the only downside being a little extra weight. A normal tank setup suffers from engine mixture change as the fuel level drops and engine leaning when inverted, both of these are significantly reduced with a uniflow setup.
2)They are a PITA because you need to make a new bung for the tank. I use a brass bushing with 2 soft brass fuel tubes and some JB weld on my raptor 50's.

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11-27-2007 07:53 PM  9 years agoPost 3
blade3d

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New Jersey USA

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Show us how it's set up

Blade3d

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11-27-2007 07:58 PM  9 years agoPost 4
spog

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11-27-2007 08:18 PM  9 years agoPost 5
blade3d

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New Jersey USA

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Hey thanks

Blade3d

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11-27-2007 09:57 PM  9 years agoPost 6
spog

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Ontario, Canada

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You're welcome.

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11-28-2007 06:57 AM  9 years agoPost 7
Kader

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Czech Republic

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Hi Spog,
I must use this brass bushing, or can I drill some next hole (approx.5mm) near main tank input and use for muffler pressure input standart tank grommet with thread ? It will made easily for me maybe .

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11-28-2007 08:25 AM  9 years agoPost 8
spog

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Ontario, Canada

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Kader,
You can use any method that's easiest for you to get two tubes in the tank. The tank must be air tight to maintain pressure. I used the brass bushing so I did not have to drill a hole in the tank.
I'm not sure what you mean by "standart tank grommet with thread", but if you use some kind of fitting with a thread it may be difficult to get the nut onto the threaded fitting because it's inside the tank.

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11-28-2007 09:56 AM  9 years agoPost 9
Kader

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Czech Republic

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Thanks for reply, It is not problem, I drill a hole, than I reeve threaded fitting with fuel line and clunk through the hole so, that flange of fitting will be in inside of tank.This operation I will do by hole for main tank input. Now should be no problem tighten a nut from the outside.Next I can put main tank rubber grommet with plastic fitting and fuel line and clunk to a main tank hole.Now the tank will be a complete.

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11-28-2007 04:49 PM  9 years agoPost 10
spog

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Ontario, Canada

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It sounds like you know what you're doing Kader. Your english is pretty good too.

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11-29-2007 07:21 AM  9 years agoPost 11
Kader

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Czech Republic

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Spog, you joke. Unfortunately my english is awful.My home language is Czech language. Thanks for the toleranct classification....

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