I am building a new FX3 Cub and I want to enhance my flight time by using two 1000cc tanks. Has anyone tried this before? I would like to hear ideas on how to route the plumbing.

One 64oz water bottle tank would work just fine with much less parts and added weight.

Bob

I have been running dual tanks for years with no issues search fortitude tanks and dan hankle on you tube for the proper way to plumb

Unfortunately a single 32 oz tank is roughly equal to a single 1,000cc tank. (2) 1,000 cc tanks, which the OP is shooting for, totals 67.6 oz.

Why not one Ocean Spray 64oz bottle with BobUSA's cap and fittings ? It doesn't get much simpler than that

My mistake, ment 64 oz not 32.

Bob

Originally Posted by Bill Vargas

Why not one Ocean Spray 64oz bottle with BobUSA's cap and fittings ? It doesn't get much simpler than that

Biggie caps are being made as of yesterday.

Bob

Originally Posted by Chris Jensen

I am building a new FX3 Cub and I want to enhance my flight time by using two 1000cc tanks. Has anyone tried this before? I would like to hear ideas on how to route the plumbing.

Chris,

This is from our build thread about us, RTR, building a Kam Aero Extra 300 with a DA 200 for a customer. https://www.flyinggiants.com/forums/...m+aero&page=57


I made up this illustration in hopes that it will explain how this "series system" works.

I will call out "top" and "Bottom" tank, it has nothing to do with the tanks placement in the aircraft, only to its location on the drawing...

Let's start with filling the tanks. As you pump fuel through the fill line the tank at the bottom (feed tank) will fill first. The over fill will travel through what was the old vent at the top of this tank into the feed clunk in the second tank. All the while this is happening the displaced air will travel out of the air vent line in the second (supply) tank.

Now its time to fly....so as the carbs suck fuel from the bottom tank, a vacuum is created that will draw fuel from the top tank keeping the bottom tank full until the top tank is empty. At that point the bottom tank will start to drop until empty as well. The air vent on the top tank works just like a large single tank in that it displaces the used fuel with air so that the tanks don't collapse.

Hope this makes sense...
Tom