What size of gas fuel tank?????? - RCCanada - Canada Radio Controlled Hobby Forum
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Old 12-22-2005, 07:17 PM   #1
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What size of gas fuel tank??????

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I am going to use a gasser for the first time in one of my aircraft (building it as we speak)... It is 34cc and I would like to know a good size of tank for a 10-15 min flight (I hear they "sip" fuel)... I have a gas conversion stopper for a Sullivan tank and various size Sullivan tanks (thought I would use one of them)... Also it has a pumped (Walbro) type carb so how far away can I mount the tank? I would like the tank about 12" behind the engine, and basically at the same height...
Ooooo and also will I need to shield anything for interferance.???..It's a standard type ignition and the RX will be about 36" behind the engine... How far away should the throttle servo be (from the engine)??? So many???????
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Old 12-22-2005, 07:23 PM   #2
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14 to 16 oz should be good enough for that size of engine I would think.

We are using 20oz tanks on our DA 50s and landing with half a tank after 10 - 12 minutes of Aerobatic flying!. Gassers really do sip compared to the gulping glow engines!
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Old 12-22-2005, 07:37 PM   #3
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Gasser setup

I am using a 16 oz tank with 30 cc McCulloch conversion, it is quite adequate. Tank position within 12" should be ok, esp if it is level with carb.
Buy yourself a resistor type spark plug, NGK makes a good one, sorry but I can't remember the part number just now. Part Source should have it in stock. Install the receiver as far from the engine as practical, at least 12".

Range check b4 first flight - Tx on, antenna collapsed, Rx on, engine not running - move away from plane while checking control response until control surfaces start to twitch. It is also a good idea to circle the plane when you get out to max disatance.Take note of distance (approx). Then recheck with engine running both at idle and full throttle. If there is a SIGNIFICANT range difference - like half - you should consider making some additional provisions to reduce interference.

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Old 12-22-2005, 08:09 PM   #4
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The Walbro carb has a built in pump so distance of the tank from the engine or its height makes no difference for fuel feed or flooding.
Keep the entire radio for the plane as far away as possible from the engine electrics including all wiring and switches.Keep the thorttle servo back in the fuse and connect it to the carb with a long run of plastic in plastic push rod well supported so it cant flex.
16 OZ tank is plenty and dont forget to use a replacement stopper meant for gas........I like three lines with good quality gas line probably 1/8 id....tygon if you can get it.........and tie off all joints with pull ties,but dont pull too tight since they will cut the fuel line.......
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Old 12-22-2005, 08:52 PM   #5
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I'd say 14oz-16oz would be good for your engine, i am looking to put this size of tank in my Stinker....

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Old 01-07-2006, 03:33 PM   #6
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I agree 16 oz should be fine. I would expect 20 minutes on that, but I'm sure you will run a few tanks dry before flying, and time it yourself. You might note that if you follow the manufacturer's instructions - and you should - and run it rich (usually as delivered by the manufacturer) during break in, you will get only about half the endurance you expect. After a few gallons are through it and you can lean it out you will get the 20 minutes endurance. I'm figuring 20 minutes with a mix of throttle settings. By the way, I really like the Sullivan aluminum tank stopper covers: very positive. Nothing worse than a gasoline leak (BOOM).

I have found the electronic ignitions to be pretty easy on interference. I've even seen throttle servos mounted on the firewall without problem. I still separate the engine, ignition, and batteries from all the other electronics by about 8 inches with no problems encountered so far. I use a micro switch and servo to allow me to cut the ignition power. Micro switches are les than $1.50 at any electronics supply house. I mention this because I use plain old birch dowels for pushroods for both throttle and ignition cut-off, keeping that 8 inch separation of conductive parts. Magneto ignitions are more problematic, though I have no direct experience there.

My engines have Walbros and Bings, and I always put the tank right on the centre of gravity with no problems. I try to have the tank at the same general level as the carb, but really don't think that is too critical. Once it is choked to prime and started you should see no change in rpm at any attitude, unlike a non-pumped glow carb, regardless of where you mount the tank. I get a lot of resistance to the idea of mounting the tank on the CG and have come to the conclusion that all this resistance is based on people's prejudices from years of experience with glow engines: where having the tank anywhere but right up on the engine causes problems when the attitude (of the aircraft) changes. For that very same reason I always use a Perry pump on my glow ignition Saitos.....

Don's Hobby Shop in Salina, Kansas publishes a pretty good book on all this stuff called Gas Engines and Giant Planes. My own edition came out before electronic ignitions were popular, but it still is an excellent guide. I just checked their web site at http://www.donshobbyshop.com/ and it looks like they are in the process of re-printing it. Maybe you could borrow a copy. I have a copy of the just published guide from the IMAA itself and have to admit I was disappointed. The book from Don's Hobby Shop is much more comprehensive.

Don't hesitate to ask any IMAA member for advice. That's what IMAA is all about. They are at http://www.fly-imaa.org/ I am personally involved with Chapter 737 in the Edmonton area.
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