Hi guys. Im rebuilding a kyosho F-4 Phantom into an E/F variant (long nose plus gun). I am totally unhappy with EDF performance...the 55mm fan does not output a whole lot of "Jet" power, its more of an allround cruiser not meant to gain much altitude. Any vertical maneuver - forget it.
I have re-equipped one with a 50mm wemotec fan, but not much gain there either.....i strongly suspect that without a closed duct and a better splitting in the channel aft of the fan, i will not gain much power in any way.

Soooo where did my thoughts go? Eeeexactly: fully ducted twin EDF. I can fit 40mm fans in there, and come up with a lightweight ducting. Now to my problem: what is there to buy in the 40mm segment?

Option A: Dr. MadThrust 40mm 8-blade unit, 8000rpm/v and 400g thrust (around 1lb) specified. Optimistic, but why not.....
Option B: ChangeSun 12blade 40mm unit. Motor? Nothing to be found.....Specs? Nothing to be found....
Option C: Open to suggestions!

Glad to hear some experiences, hints or pointers

Cheers
Hank