Is it necessary to wrap the fuel tank in foam, isolating it from vibration of the airframe?

Maybe not neccessary, but it sure can save you a bunch of headaches down the road. Vibration in the fuel tank can cause some pretty nasty situations with your fuel system.

Ken

Not if it's an electric model.
I think most would agree with Ken.

Cheers,

Colin

Always wise with a gas model. Foaming or bubbling fuel can create engine problems that are almost impossible to track down. If the problem is too severe, it can cause your engine to quit in the air. NEVER a good thing.

Foaming is a PITA. Air bubbles cause lean runs, even as stated, stoping the engine. Any direct contact of tank to wood will transfer the vibration. Free foam is "findable" from electronic stores.
As a rule the softer the foam the better it isolates vibration. Foam can become fuel soaked and compacted loosing it's vibration reducing quality. Bagging the foam in sandwich bags isolates it from fuel and keeps it soft.
So use the foam, your engine will thank you![8D]

As mentioned, foaming fuel is a problem. With my gasoline powered planes I use a Walbro felt cluck. This eliminates bubbles in the fuel line. This is what they look like: http://bliksemseplek.com/images/m12/clunk_lg.jpg

I get mine from the local mower and saw service center. I use them with gassers from 40cc to 120cc.

Bliksem

No. I have never, ever done this. Never seen foaming, no problem adjusting carburetors, don't know why I keep hearing this in these forums.

I balance the prop, I fly part throttle most of the time, no problems.

Just my opinion. Your results may vary.
Dave Olson

I think it depends on the fuel used as well. I know they are all basically methanol and nitro but oil and additives could vary and affect the foaming characteristics. Regardless, I try to always use foam. It's cheap insurance against any potential problem.