I'm into the RC car / truck side of the RC Nitro hobby. I don't know a whole lot about props, fans and mounting of such.

I wish what I was doing was written in a manual, I'd surely read it.

I'd like to mount a Ducted Fan (minus the duct) to a .21 size buggy engine that has a pilot shaft. Here is a picture of the host engine:


http://www2.towerhobbies.com/cgi-bin...?&I=LXFAC3&P=7

Here are the specs from a standard pilot shaft:

Crankshaft threading: 1/4-28
Pilot shaft diameter: 5mm (0.19")
Crankshaft diameter: 7mm (0.28") (flywheel position)

(also that brass tapered cone for the flywheel comes off)


This is the ducted fan blade I'd like to attach:


http://www2.towerhobbies.com/cgi-bin...?&I=LXALV3&P=7

specs:

Width: 15/16" (24mm)
Inner Diameter: 1/4" (6mm)
Outer Diameter: 3-1/2" (90mm)

The first thing I notice is that the engine's carb sits in exactly the wrong spot and would hit the fan if it were too close. I do know, however, that this can be done. People regularly use props to break in RC car engines. Here's is an example of that:



I need to know what kind of parts are needed to bring the engine and the prop together. Also, I haven't purchased the fan blade yet. I'm open to suggestions. I need to push as much air as possible with the above engine. The space that I can do this in should no exceed 4 inches in diameter.

I'm sorry if I have posted this I the wrong section. I'm hoping that the jet / ducted fan airplane hobbyists have some experience with this type of thing.

Thanks,
RobH