ORIGINAL: Flyjets
Alright
The Project that wasn't suppose to progress appears to be moving forward.
I need everyones help again I'm enclosing a series of Photos showing the original Fans.
Some research leads me to think they are called Turbax III Fan Unit am I right.
As luck once again has it a friend that runs a LHS has this other Fan and a in need of repair OS91 DF
Looking at this fan I think it's a Ram Tec is this correct?
Now several questions The Ram Tec has many more Compressor Blades. This indicates it's more efficient at lower RPM guessing in the 20K range.
The Turbax fan looks similar to some WeMoTec Mini Fan indicating high RPM would be best say 40K but I doubt a gas engine can turn those RPMs it's probably just an old design.
The OS91 needs a new Barrel and new Gaskets all around. It looks like a older engine.
Any incite you guys have I am all ears as I am not a Glow Ducted fan expert.
Ian
You identified both of them correctly. The Turbax is not very efficient compared to the Ramtech or dynamax, it's really obsolete. It was not really made for a 91, more like a 65.
You can use the Ramtech fan, no problem, but stay away from the blown engine. A new piston and cylinder is $180. A new engine is $300 or so.
There are many bargains to be had on new or slightly used Ramtech or Dynamax OS91 setups, they are always trading hands here and on ebay and such. I would hold out for $400 for each setup, with the pipe, for new or near new. I would NOT want to be mussing with a rebuilt engine of unknown origin on a twin with the engines way far apart like that, just to save a little bit of money. If a piston and cylinder was only $50, you might be saving a lot, but they aren't!