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HelicopterGasser Model RC HelicoptersOther › Fuel Lines and Filling Procedures
12-31-2009 01:43 AM  7 years agoPost 1
2tall

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Crystal Lake, Illinois, USA

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I'll be finishing a Predator build over the next few days. The instructions relating to fuel lines make no special provisions for filling the tank. What is the most popular configuration? Is anyone using a special filling valve? The gas tubing seems to be too heavy for the simple "T" connection and cutoff clamp arrangement used with nitro tubing. I doubt that a normal nitro clamp would actually pinch closed the gas tubing.

"Pay attention...lest the ground rise up and smite thee."

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12-31-2009 02:07 AM  7 years agoPost 2
rotaryfalcon

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S.E. USA

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Install a T in the fuel delivery line to the carb. You dont have to worry about the fuel backfeeding like a glow engine, due to the valving in the carb.

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12-31-2009 02:13 AM  7 years agoPost 3
Helizrule

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Lake Ariel, PA

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Here are some pictures of my Predator gasser. You want to loop the vent line to the top of the frame as shown to avoid leakage during inverted maneuvers. The T-fitting I used is a very nice brass one from a fish tank air pump that you can find at any pet store.

YES, that is a 2-1 Reg you see in the picture. I know someone is going to comment on that one Someday I'll be able to get that Jewel Gen.

Also pictured is a Walbro heavy clunk filter which I don't have installed at the moment.

One mile of road will take you one mile. One mile of runway will take you anywhere in the world.

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12-31-2009 02:25 AM  7 years agoPost 4
2tall

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Crystal Lake, Illinois, USA

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The T-fitting I used is a very nice brass one from a fish tank air pump that you can find at any pet store.
Looks like you have the "T" fitted in the primer return line. Can I conclude that filling through that line works without any problems?

Thanks for the reply and the photos.

"Pay attention...lest the ground rise up and smite thee."

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12-31-2009 02:27 AM  7 years agoPost 5
Helizrule

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Lake Ariel, PA

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Yes, filling thorough the primer line works perfectly and will not back fill to the carb.

One mile of road will take you one mile. One mile of runway will take you anywhere in the world.

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12-31-2009 02:31 AM  7 years agoPost 6
rbort

rrProfessor

Franklin, MA - USA

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I don't use any extra fittings

Check this video, it will explain it all:

http://www.youtube.com/watch?v=E3Nra3iDOHI

Wow, I didn't realize this video now has over 7000 views!

-=>Raja.

MA 1005 Hanson 280, 4129 flts
Spectra 27 3DMax, 3187 flts
Whiplash V1 Hanson 300, 1425 flts
Whiplash V2 Hanson 300, 185 flts

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12-31-2009 02:55 AM  7 years agoPost 7
2tall

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Crystal Lake, Illinois, USA

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Thanks Raja. Is there any danger of the fit between the fuel lines and the carb nipples becoming sloppy after the repeated on/off regime from filling and draining?

"Pay attention...lest the ground rise up and smite thee."

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12-31-2009 02:58 AM  7 years agoPost 8
Helizrule

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Lake Ariel, PA

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That is why I do not use that method however, it seems to work very well for Raja. The theory is to not use any fittings or inline filters that can cause air bubbles. The KISS method is usually used for fuel lines. Mine has worked so I never needed to change it to straight lines. I guess what works for you.

One mile of road will take you one mile. One mile of runway will take you anywhere in the world.

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12-31-2009 03:20 AM  7 years agoPost 9
rbort

rrProfessor

Franklin, MA - USA

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2 tall

Not at all - never happened in 12+ years, fuel lines won't slip off the carb because its barbed.

You should however absolutely tie wrap the fuel lines on the tank side, inside and out. One of those slipped off on my outside the tank to the carb once and caused an auto in a dirt field that landed safely in Maine. A trip to Roger's hardware store and it was fixed with a mini plastic clamp. Nowadays I just use tiewraps.

-=>Raja.

MA 1005 Hanson 280, 4129 flts
Spectra 27 3DMax, 3187 flts
Whiplash V1 Hanson 300, 1425 flts
Whiplash V2 Hanson 300, 185 flts

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12-31-2009 06:10 AM  7 years agoPost 10
rotaryfalcon

rrApprentice

S.E. USA

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Why pull the line off the carb when you can just pull a plug from the T. It allows the filling to be at a convient place when the carb is not acessable.

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12-31-2009 02:22 PM  7 years agoPost 11
rbort

rrProfessor

Franklin, MA - USA

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If the carb is not accessable then of course makes sense

Like in airplanes with cowls. But for helicopters the carb is pretty much always accessable in mine unless maybe you got a fuselage on it.

Just makes it simpler not to have the extra fittings. Also if you have a T and the plug comes out, your engine will starve with air. Seems like a more "secure" system when the line from the tank is direct to the carb with no cuts and connections in-between.

-=>Raja.

MA 1005 Hanson 280, 4129 flts
Spectra 27 3DMax, 3187 flts
Whiplash V1 Hanson 300, 1425 flts
Whiplash V2 Hanson 300, 185 flts

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12-31-2009 03:41 PM  7 years agoPost 12
rotaryfalcon

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S.E. USA

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Yeah I have just started my first gasser and I guess the carb is pretty much always in the open, so a T may not be needed. On my glow helis only one of the five is able to be filled directly by the carb line. I have never lost a plug though. I was just thinking a plug and T combo may be easier than wrestling the carb line off every time, Tygon can take a pretty good "set" and I have had the brass inlet tube pull out of a carb before. I guess if you fill by the carb line it is probably easier to remove than one that is not removed often.

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12-31-2009 04:15 PM  7 years agoPost 13
rbort

rrProfessor

Franklin, MA - USA

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Absolutely correct

I guess if you fill by the carb line it is probably easier to remove than one that is not removed often.
Over time the fuel tubing will form itself "larger diameter" where it goes into the carb nipple and will be easier to slip off and back on for fueling.

With brand new tubing you may have to tug on it for the first few times, but in time it will be easy.

As I said before though, don't worry about it ever coming off on its own, its never done that to me.

-=>Raja.

MA 1005 Hanson 280, 4129 flts
Spectra 27 3DMax, 3187 flts
Whiplash V1 Hanson 300, 1425 flts
Whiplash V2 Hanson 300, 185 flts

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12-31-2009 08:02 PM  7 years agoPost 14
GREYEAGLE

rrElite Veteran

Flat Land's

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Here's Mine

Pretty basic, never has leaked. In the open posistion -fuel flows to the carb. Closed posistion, to fill to tank or shut fueloff.

Carb never see's any fuel pressure while filling. The reason I did it, I'm alway's leary about cracking the fuel nipple by pulling on it.

greyeagle

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12-31-2009 09:05 PM  7 years agoPost 15
pgkevet

rrKey Veteran

Wales

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Over time the fuel tubing will form itself "larger diameter" where it goes into the carb nipple and will be easier to slip off and back on for fueling.
And a pig to shift in the frost; two feet on the carb, two hands on the line and heave

pgk

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01-01-2010 01:30 AM  7 years agoPost 16
rotaryfalcon

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S.E. USA

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Hey pgkevet, I have a question. The earlier part of my life I worked as an " english car mechanic" as we were called. I learned about Whitworth, spanners, gudgeon pins etc., and that when specified to wash parts in parafin they really ment kerosene, but what in the heck is a pig to shift in the frost!?

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01-01-2010 01:34 AM  7 years agoPost 17
rbort

rrProfessor

Franklin, MA - USA

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he means

but what in the heck is a pig to shift in the frost!?
Its hard to pull off when its cold, and he's right about that, the tubing gets stiffer in the cold weather and is not as easy to pull off as on a hot summer day.

I had both hands on mine today as I pulled it off the carb

-=>Raja.

MA 1005 Hanson 280, 4129 flts
Spectra 27 3DMax, 3187 flts
Whiplash V1 Hanson 300, 1425 flts
Whiplash V2 Hanson 300, 185 flts

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01-01-2010 02:06 AM  7 years agoPost 18
rotaryfalcon

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S.E. USA

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AAAHHH!

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01-01-2010 06:34 AM  7 years agoPost 19
pgkevet

rrKey Veteran

Wales

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..just an expression...but you guys use pigs to shift stuff too..oil pipelines..

A traditional english car mechanic would doff his flat cap at his patron, suck on his teeth, shake his head and say 'oooh, that's going to cost a bit, mate' before ripping you off for replacement parts he hadn't and loosening some stuff for new business..

pgk

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01-01-2010 01:13 PM  7 years agoPost 20
Fixit

rrElite Veteran

UK

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A traditional english car mechanic would doff his flat cap at his patron, suck on his teeth, shake his head and say 'oooh, that's going to cost a bit, mate' before ripping you off for replacement parts he hadn't and loosening some stuff for new business..
That sounds about right and if the sign outside says BMW they can rip you off twice in the same deal.

I only like to fly gassed up

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