Motorized display Osprey

There was an article in the December 2006 issue of FSM where someone did just that with a 1/72 scale Italeri Osprey kit, so getting motors to fit a 1/48th scale kit shouldn't be a problem.

The author said he obtained the motors from battery powered toy monster trucks which cost $1 each, but didn't indicate where he got them from. He also replaced the plastic prop shafts with brass tube, running in a larger diameter brass tube mounted in the nacelles to avoid the plastic shafts melting.

This reminds me of the greast 1/72 counter rotating prop challenge.

There is a mind blowing motorized Lego Osprey on the web.

That would be nice but asking for trouble. I could get NASA to solder the wires to the world's finest mini motors, and they'd still find a way to stop working once installed and sealed in. Murphy's Law. 

I'd be tempted to put the motor (s) in the fuselage and use shatfs and gears.

Pretty small motors that run on up to 3.7 volts can be found in small RC airplanes now, look at an R/C store in the repair parts for things like the Vapor Lite sold by Horizon Hobbies.

https://www.horizonhobby.com/17-000kv-6mm-coreless-motor-p-eflum6809

Maybe phone vibration motors