Ain't that the plain truth.

So you've heard that 1-2 inches of inlet is enough huh? I hope
that rings true! If so, I'll be a very happy builder. I noticed on
some of the above spitfire pictures that there is a hole in the
cowl below the scale muffler stacks. Is that an inlet hole? I
almost didn't notice it at all.

I'll be adding a ramp from the chin scoop to the engine cylinder,
and then I'm leaning toward pulling air in from that hole pattern
on the side of the chin. A fan could sit nicely behind this chin
ramp in a flat position, and blow a nice amount of air on to the
cylinder.

Someone did mention the need to have a removable duct for
that reason, and I think they were dead-on right. I'm still not
sure how I will make the duct. Maybe some sort of thin plastic
(like transparency sheets) will work nicely. We'll see. But yeah,
I think I'll have to have sections of it that are removable. An
added complexity!

Have you seen the electric 5-bladed spitfire thread in the Warbirds
forum yet?