I am building a Dave Platt Me109G using a large electric motor ( Scorpion )

From checking motor charts and doing the math , It seems a 22 X 14 2 blade prop might be best for my set up.
I plan to stick with 2 blade, but need to order the prop.

But the spinner is almost 6 inches across. So a six inch center portion of the prop is blanked out by the spinner.

Anybody given thought to how a big spinner affects prop performance vs a no spinner warbird like a Corsair.

Like, does one need to increase diameter if the spinner is huge?

Thanks

Simple answer is 'no'. The outer 1/3 of the prop does most of the work.
Evan.

Ditto. The outer 1/3rd of the prop. Best of luck with your new plane!

Read thru this:

http://www.dc-rc.org/pdf/Model%20Pro...%20Article.pdf

Thanks guys

Read the link Greg, thanks. Although I think I may need the "Props for Dummys " book instead.

Tom

No, you should be fine. Platt flew it with a 2-stroke .90 or 1.08 engine which would mean a prop of less than 18", probably 16". Its the outer portions of the prop that do the work.

I had this same question in my first years of modeling.. but like one guy told me.. the real Corsair has about 5 -6 feet of blocked prop ! The tips do most of the work...

Look at an R-2. Over 50% of the prop is blowing air into the cowl. At the time, it was one of the fastest planes in the world.