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Midland Helicopters . HeliProz . ZoomsHobbies

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Gasser Model RC Helicopters > Spectra G Fuel Tank Setup
 
 
Forced_Inductio
Heliman
Location: Camrose, AB

I went out and bought myself a dubro 16 oz tank like others had recommended, now i am wondering how did you guys set it up?

The first question has to do with the clunk line. the instructions show the clunk line (small line i believe) coiled once around inside the original tank. is that how you set it up with the dubro tank? i am going to use the original clunk to begin with, and probably switch to something like a fuel magnet later on.

Second question has to do with the vent and return lines. Did you guys use the fittings that came with the kit or did you buy different ones? I saw a pic of someone elses setup and it shows the fittings at the back of the tank, furthest away from the opening. with the original tank, this wouldnt be a problem. but with the tiny opening on the dubro tank, theres no way im going to be getting ANY fittings pushed through the inside never mind trying to put them through the back of the tank. How did you guys do this?

Thanks alot
07-03-2008 10:05 PM
 
 
pgkevet
Senior Heliman
Location: surrey UK

I've just done this..and if I can manage it then anyone can

I used the fittings supplied. The only mistake I made (on the tank not the rest of the build...<sigh> was making the two return and vent line holes a smidgen close to each other so that I couldn't use the washers. To get the fittings through I used a length of fence wire which I usually use for pulling belts through my 600 boom (I digress)

After drilling the holes I used the fitting from the outside and screwed it in to cut a thread then

Thread the fitting onto the wire and make a decent kink part way down the wire to stop the fitting slipping too far.. feed the wire through the stopper hole, out the drill hole and pull through. The kink stops the fitting sliding and draws it through your drill hole. Grab the fitting (I used artery forceps/haemostats) across the tube wall and pull up and catch the thread and screw it through.. then pull back on the wire to remove it before locking down the fitting with the nut (and washer if you left room).

As Raja pionted out to me you have to plan the front right-angle fitting so there's enough room to turn it against the tank overhang.

After all fittings and the stopper are done I pressure tested and leak tested with 2-stroke by fitting short line lengths and plugs and a hand fueller

pgk
07-04-2008 12:03 AM
 
 
Forced_Inductio
Heliman
Location: Camrose, AB

so you used the fittings that came with the kit for the pickup line as well? where did you drill the hole for that and what did you do with the stopper that came with the tank? i was just going to use the brass line through the stopper like you would normally.


also, how did you run the clunk and clunk line?
07-04-2008 12:07 AM
 
 
pgkevet
Senior Heliman
Location: surrey UK

Quote 
so you used the fittings that came with the kit for the pickup line as well? where did you drill the hole for that and what did you do with the stopper that came with the tank? i was just going to use the brass line through the stopper like you would normally.
also, how did you run the clunk and clunk line?

I bought the gas upgrade stopper for the dubro tank. The clunk hole was drilled to the side of the opening and I used the right angle fitting there. As for clunk line length I left it as was with the default clunk..but I do have the 'recommended' clunk on order.

Having said tht I'm still hovering and tweaking so I can't state that it's going to work with aerobatics

pgk
07-04-2008 12:21 AM
 
 
Forced_Inductio
Heliman
Location: Camrose, AB

itll be interesting to hear from Raja. I studied his gallery pics, but i cant see through the tank to see his clunk setup :P
07-04-2008 01:06 AM
 
 
hal
Heliman
Location: canada

Hey, congrat's on the spectra, did you get it from modelland like i suggested. No biggie either way, just curious.
07-04-2008 01:55 AM
 
 
Eury
rrProfessor
Location: Ankeny, IA, USA.

I used the fittings and clunk that came with the tank, along with the supplied clunk. I set up the clunk line with the loop just like the instructions said, but used a different clunk line. Works great.


Nick Crego
I swear to God, I'll pistol whip the next guy that says Shenanigans
07-04-2008 02:13 AM
 
 
rbort
Elite Veteran
Location: Franklin, MA - U.S.A.

I'm using the walbro felt clunk in mine.

That clunk just fits in the narrow neck of the tank. Replace the stopper with a gasoline stopper, and offset the holes in the stopper with the holes in the cap and back end so the tank seals.

With a felt clunk you don't need fancy loops inside the tank. The clunk line just goes straight back to the rear of the tank, stopping just short of the back edge so the clunk can flop around on that side without getting hung up on the walls.

As far as tank assembly, just like pgkevet says I use the stock nipples and just make sure you space them apart enough to fit the washers on top but not too much so they still fit within the oval opening in the CF plate that the tank sits against. Also make sure the 90 degree bend can clear the tank hump while you spin it around to tighten the fitting. I use the "lost screw finder" tool to hold the nipples and insert them through the opening of the tank to install the vents in the rear. A bent OS monkey wrench serves as a took to hold the clunk line nipple on the inside of the tank while I spin the 90 degree bend around to tighten the fitting.

-=>Raja.

1005 Xcell Gas, BHH G26 3D Plus, Jewel Generator
Spectra-g, BHH G26 3D Plus, Jewel Generator
07-04-2008 04:27 AM
 
 
Forced_Inductio
Heliman
Location: Camrose, AB

thanks for the tips guys. i got the fittings in no problem. and yes i did get my kit from modelland. great guys there.

Do i reslly need s gssoline stopper or will the one that csme with the tsnk work?
07-04-2008 06:10 AM
 
 
pgkevet
Senior Heliman
Location: surrey UK

If memory serves 'fixit' used/uses standard nitro tank in his conversion?? However since dubpro sell a gas bung I assume there is a reason. I'm sure it won't matter short term but there may be either dissolution or contamination issues ahead. For a few pennies cost it wasn't worth worrying about..

pgk
07-04-2008 08:22 AM
 
 
rbort
Elite Veteran
Location: Franklin, MA - U.S.A.

OF COURSE you do

DONT use gas with a nitro stopper. It will deteriorate and leak or contaminate your engine. You HAVE to buy the gasoline stopper and replace the stock one that comes with the dubro tank.

-=>Raja.

1005 Xcell Gas, BHH G26 3D Plus, Jewel Generator
Spectra-g, BHH G26 3D Plus, Jewel Generator
07-04-2008 03:17 PM
 
 
Forced_Inductio
Heliman
Location: Camrose, AB

i want to run a header tank as well (peace of mind for me). any suggestions where i can get one that will work for gas?
07-05-2008 01:48 AM
 
 
Eury
rrProfessor
Location: Ankeny, IA, USA.

Any of the ones that just have a bracket that hold a 2oz Hayes tank would work fine. They just have nipples molded into the tank.


Nick Crego
I swear to God, I'll pistol whip the next guy that says Shenanigans
07-05-2008 01:50 AM
 
 
Forced_Inductio
Heliman
Location: Camrose, AB

so the clunk line is non-replaceable?
07-05-2008 01:55 AM
 
 
rbort
Elite Veteran
Location: Franklin, MA - U.S.A.

Again. going down the wrong path

Do NOT run a header tank. You don't need it with gassers as the carb is a pumper. I've tried it once and after some time it gets air in it and over time you get more and more air in there.

Trust me you don't need it. Use a dubro tank, set your timer to 15 minutes and go. If you fly really hard / high head speed you may need to run it less than 15, though I haven't reached that issue.

-=>Raja.

1005 Xcell Gas, BHH G26 3D Plus, Jewel Generator
Spectra-g, BHH G26 3D Plus, Jewel Generator
07-05-2008 02:11 AM
 
 
Forced_Inductio
Heliman
Location: Camrose, AB

thanks alot guys for all the help.
07-05-2008 07:58 AM
 
 
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Gasser Model RC Helicopters > Spectra G Fuel Tank Setup
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