Welcome to The FlyingGiants! - please login or click this bar to join our community...

 

Welcome to The FlyingGiants Community! We're all about fun, and inside you'll find the greatest, friendliest, and most helpful group of people around! If this is your first time visiting, please check out site, and click here to sign up! We hope to see you soon!!

Go Back   FlyingGiants > Giant Scale Planes > Gas Engines
Forgot your password? Create a new account


Reply
 
Thread Tools
Old 01-28-2011, 08:18 AM   #1
pjp01
Flyin' Around
 
pjp01's Avatar
 
Join Date: Mar 2010
Location: Windsor
Posts: 14
Default Fuel setup 50cc

I am just finishing up a Carden Cuda. Currently locating the fuel dot and vent etc. Planning a two line system. The vent is easy enough to route out the bottom aft of the gear. Finding a location for the fuel dot is a bit more of a challenge.

Should the fuel dot be located higher than the tank to prevent fuel from syphoning out right after fueling? Or can it go lower than the tank.

There is not much room on the fuselage above the wing so the options seem to be below or possibly up on the turtle deck aft of the cockpit. It would fit nicely on the motor box bottom but access may be a bit dificult (cowl is quite open down there) and it is well below the tank at that point.

Any comments and advice appreciated.

pjp01
pjp01 is offline   Reply With Quote
Old 01-28-2011, 09:16 AM   #2
terryscustom
Wood Butcher
 
terryscustom's Avatar
 
Join Date: Jan 2007
Location: South Dakota
Posts: 6,526
Default Re: Fuel setup 50cc

I put together a Yak last fall and only had one spot to put the fuel dot and it happened to be level with the bottom of the tank. Did not think anything of it, except when I fueled the tank for the first time. As soon as you pull your filler out the gas starts siphon out so you have to pinch the fuel line and put the dot back in. If you are one that does not empty your tank every day you could put a check valve in-line and problem solved. I have too many planes (yea right!) and feel better emptying them every time.
__________________
Life's short, Fly hard!!
http://fibertechnmore.com/
My scratch build designs
terryscustom is online now   Reply With Quote
Old 01-28-2011, 09:17 AM   #3
Low_Cal
Bad-ass Super Contributor!
 
Low_Cal's Avatar
 
Join Date: Dec 2009
Location: South Weber, Utah
Age: 56
Posts: 1,924
Default Re: Fuel setup 50cc

Fuel syphoning can definitely be an issue with gasoline. I wonder if you could use one of those one-way valves made for smoke systems? That would keep you from pumping out the tank, but there is little reason to do that anyway with gasoline. I think its actually better to leave some gas in the tank; keeps the pickup line soft.
__________________
“Aircraft are a lesson in economics . . .” – Don Sheldon
Low_Cal is offline   Reply With Quote
Old 01-28-2011, 09:20 AM   #4
Scott Gerber
Closed Account
 
Scott Gerber's Avatar
 
Join Date: Jun 2007
Age: 56
Posts: 3,108
Default Re: Fuel setup 50cc

One word.... http://www.parts-express.com/pe/show...ource=googleps


Scott

Last edited by Scott Gerber; 08-06-2013 at 10:34 AM.
Scott Gerber is offline   Reply With Quote
Old 01-28-2011, 09:53 AM   #5
Edgeman 540
Not Active
 
Join Date: Apr 2008
Age: 42
Posts: 3,380
Default Re: Fuel setup 50cc

Try to mount the fueler as high as you can preferably above the tank.
Edgeman 540 is offline   Reply With Quote
Old 01-28-2011, 10:01 AM   #6
wfield0455
Bad-ass Super Contributor!
 
wfield0455's Avatar
 
Join Date: Oct 2007
Location: Holliston, MA
Posts: 1,524
Default Re: Fuel setup 50cc

Or even just leave enough slack in the fill line so that you can lift it about the top of the tank when disconnecting the fill line.
__________________
Wayne
wfield0455 is offline   Reply With Quote
Old 01-28-2011, 10:24 AM   #7
pjp01
Flyin' Around
 
pjp01's Avatar
 
Join Date: Mar 2010
Location: Windsor
Posts: 14
Default Re: Fuel setup 50cc

Thanks for the replies. The hemostats are a good option. I am leaning towards sticking it aft on the turtle deck. Thunderbolt R/C has a red anodized dot that would not be too unatractive. Way above the tank back there. Clearly siphoning has to be delt with one way or another.

pjp01
pjp01 is offline   Reply With Quote
Old 01-28-2011, 10:24 AM   #8
JoeAirPort
Obsessed
 
JoeAirPort's Avatar
 
Join Date: Jan 2006
Location: Milwaukee, WI
Age: 50
Posts: 7,348
Default Re: Fuel setup 50cc

That's a good work-around but as soon as you accidently drop the fuel line, it spills gas. I always locate it above the tank. Not much above the tank, just at the top level where the vent is. I agree that there are not many places to mount it that high. You also don't want the switch under it....so you don't get gas on it.

In this pic you can see the fuel dot is below the switch but both are above the thrust line. The dot is right at the top of the tank....not above it.
Attached Thumbnails
  • Click image for larger version

Name:	Yak at field 1.jpg
Views:	85
Size:	142.8 KB
ID:	348318 142.8 KB · Views: 85


Last edited by JoeAirPort; 01-28-2011 at 10:37 AM.
JoeAirPort is online now   Reply With Quote
Old 01-28-2011, 10:34 AM   #9
Edgeman 540
Not Active
 
Join Date: Apr 2008
Age: 42
Posts: 3,380
Default Re: Fuel setup 50cc

Quote: Originally Posted by JoeAirPort
View Post
You also don't want the switch under it....so you don't get gas on it.
As stupid as this may sound I've seen in many times at the field. Great point Joe.
Edgeman 540 is offline   Reply With Quote
Old 01-28-2011, 10:39 AM   #10
JoeAirPort
Obsessed
 
JoeAirPort's Avatar
 
Join Date: Jan 2006
Location: Milwaukee, WI
Age: 50
Posts: 7,348
Default Re: Fuel setup 50cc

Quote: Originally Posted by Edgeman 540
View Post
As stupid as this may sound I've seen in many times at the field. Great point Joe.
Thanks Edge. I probably actually did this many planes ago and vowed never to do it again.
JoeAirPort is online now   Reply With Quote
Old 01-28-2011, 10:48 AM   #11
pjp01
Flyin' Around
 
pjp01's Avatar
 
Join Date: Mar 2010
Location: Windsor
Posts: 14
Default Re: Fuel setup 50cc

Thats great, thanks for the picture. Nice vids in your signature. Hopefully this plane flys just a fraction as well as that. First large scale and 3d plane for me. Fun to build.

Jason
pjp01 is offline   Reply With Quote
Old 01-28-2011, 01:45 PM   #12
gmohr
Gettin' Lower!
 
Join Date: Apr 2010
Posts: 65
Default Re: Fuel setup 50cc

Any reason you chose not to go with a three line system? They're just easier and better imo.
gmohr is offline   Reply With Quote
Old 01-28-2011, 02:08 PM   #13
Low_Cal
Bad-ass Super Contributor!
 
Low_Cal's Avatar
 
Join Date: Dec 2009
Location: South Weber, Utah
Age: 56
Posts: 1,924
Default Re: Fuel setup 50cc

As for fuel dot and switch placement, I usually put them on opposite sides of the plane. That way you can put the fuel dot as high as possible without the switch getting in the way or getting contaminated.

+1 on the three line system. Also consider this, eliminating the T fitting from the engine feed line increases reliabilty in several ways. If the fuel dot plug falls off inflight on a three line system, its a non-issue.
__________________
“Aircraft are a lesson in economics . . .” – Don Sheldon
Low_Cal is offline   Reply With Quote
Old 01-28-2011, 02:41 PM   #14
JoeAirPort
Obsessed
 
JoeAirPort's Avatar
 
Join Date: Jan 2006
Location: Milwaukee, WI
Age: 50
Posts: 7,348
Default Re: Fuel setup 50cc

Quote: Originally Posted by pjp01
View Post
Thats great, thanks for the picture. Nice vids in your signature. Hopefully this plane flys just a fraction as well as that. First large scale and 3d plane for me. Fun to build.

Jason
Thanks.
JoeAirPort is online now   Reply With Quote
Old 01-28-2011, 03:28 PM   #15
pjp01
Flyin' Around
 
pjp01's Avatar
 
Join Date: Mar 2010
Location: Windsor
Posts: 14
Default Re: Fuel setup 50cc

Only planning a two line for weight savings. Seemed like a fairly common setup.
Haven''t ruled out a three line system. It does seem a bit more bullet proof to me.
Thanks for the comments
Jason
pjp01 is offline   Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools



All times are GMT -5. The time now is 10:53 AM.

All Flyinggiants.com content copyright 2006-2014 by RCGroups.com, LLC except where otherwise indicated. The Flyinggiants.com logo is a trademark of RCGroups.com, LLC.
Please report any misuse of our trademarks or copyright violations using the contact form.
RCGroups Network :: RCGroups :: Crackroll :: RC Cars

Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.