hi there
i'm looking for the option to convert my gas engine (52 8.5 cc) to a ducet fan is it [possible? and if so what type of prop or fan i need to mount on it?

thanx
eli ben david

A regular sport aero-model engine is really not suited for a ducted fan plane.
DF engines are special made, and turn almost twice the RPM's your engine
will turn, and use special tuned pipes to achieve those RPM's.

If you want to try a DF project, you will need a proper engine. []

FBD.

After having some experience with ducted fans, I advise you not to try to improvise. It won't work and you will be very disappointed.

The best ducted fan setup uses either an O.S. .91VRDF or BVM .91 engine and appropriate fan. Far more expensive than the idea you have but thes will provide sucess and satisfaction, trying your engine with a fan will not work at all.

The available fans are designed for very high RPMs to develop the thrust needed and for engines with enough power to crank them at 22,000 to 24,000 RPMs.

i'm thinking that the orignal post wasn't so clear?

are you talking about a 0.52 cu.in. (8.5 cc) glow engine??

or a 5.2 cu. in. (85 cc) spark ignition engine??



dave