3W is a wood prop,,


edited

Brillelli 36GT ,
my MVVS 35 gasser pulls a 3W 20x8 at 7000, so if your Brillelli 36GT is as powerful as my MVVS then I would say try (if it's not to close to the ground) a 20x6, 20x8, 21x6, 18x10, 19x10

see 3W props here, once in click on products ,,
http://aircraftinternational.com/

Jim