building my very first plane
For cooling, 150% OUTLET AREA FOR A GIVEN SIZE OF INLET AREA.
For the throttle problem, a snug fitting piece of fuel line (1") over two pieces of pushrod, make sure the rod extends past the fuel tubing 1/4" on either side. Connect to carb, and servo, the "excess" movement will be taken up by the sliding action of the tube/pushrod.
Jetts