Will I need a "chicken hopper" tank for the Brodak Guardian/TT 36 combo, and will 3 1/4 ounces be large enough?

Thanks,
Jim

Although not mandatory, a chicken hopper would work well. RSM sells them at a reasonable price. 3 1/4 ounces should be plenty with that engine unless you are planning to do some real NATS caliber prop hanging.

Not sure but you may have a problem with the chicken hopper at low speeds, the GRW depends on centrifugal force to feed fuel into the hopper and they may not feed at low speed. I really don't know just thinking. I do know most I've used required a different needle setting on the ground than in the air which I didn't really care for.

The chicken hopper setup is really the best that I know of to use for profile. The chicken hopper requires the big tank to be sealed (no leaks at all) and two lines, a feed and a return, to keep the little tank full but never overflowing. Once you have this right, all the rest of the effort goes into positioning the little tank and to the location of the uniflow vent in the little tank. (You may also choose not to uniflow the little tank and it will still work fine as long as there remains enough gas to keep the little tank full. You may start to go lean at the very end of the flight if you empty the big tank and start draining the little tank.)
I use side-exhaust engines in Profile, so I am free to position the little tank directly behind the engine. The big tank is mounted rather high on the fuselage, so gravity keeps the little tank full, even just sitting on the ground.
If you have problems going lean or rich in high speed, move the little tank farther in or out, respectively, to even out the setting. It is that freedom of movement to keep the runs steady that makes the system so versatile.
Pete