Fastech prop shaft

[bigcam406]

I want to convert my Fastech nitro to brushless.i have a question concerning the propshaft diameters.on both versions of the Fastech they both use the same propshaft(listed as pro2813).it has a 1/4'' diameter.the brushless version uses props with a .187" diameter.so how do the brushless versions use a larger prop with a .187" inch shaft size when the nitro version uses a .125" diameter? am I missing something? thanks in advance.

[TheShaughnessy]

Sounds like the flex for a shockwave. You will want .187 for a brushless fastec

[bigcam406]

Sounds like the flex for a shockwave. You will want .187 for a brushless fastec

according to the Proboat site,they both use the same flexshaft.wouldnt be a different sized drivedog?