That's a humongous combination -- it's probably capable of flying something much bigger than you'd want to step into a circle with.  If you do use it you'll want five or even six cells to get the prop spinning fast enough, and you'll probably not use everything the motor's good for.

I suggest MotoCalc: http://www.motocalc.com/.  I haven't used it for decades, but when I did it was spot on.  Scale control line is going to be close to scale RC as far as motor, prop, and battery selection, so you should be on solid ground.

Frankly, if someone gave that stuff to me I'd try to trade it for something one or two sizes smaller, or I'd build a big RC plane for it.

Tim I'm trying use something that was "free" . Let's remember that it does have a throttle .I could fly at say 1/2 throttle if it's too powerful. Regarding bigger R/C planes I've got a 100" Me109  90 % done ...so I'm not looking for  bigger R/C stuff .This plane is "stupid big" and what possessed  me to start building it 15 years ago now seems like a joke....never again!

Hey, I'm not saying don't do it, I'm just saying it's big for the job.

I'd go with one of the radial engine planes -- with the longer-nose planes you'll run the risk of needing lead in the tail; the short-nosed planes will need extra nose weight anyway.

I think you'll want six cells -- that'll be good for about 8000 RPM.  More would be better, but if your "26S" really meant two to six you can't go higher.  On the minus side, 8000 RPM isn't much, but on the plus side, it'll mean a bigger prop, which will mean it'll look better than the usual toothpick you see on the front of model warbirds, and the motor should be able to run cool while putting out lots of torque.