http://www.youtube.com/watch?v=YUy9GxpxzUw
http://www.youtube.com/watch?v=91B29tIIQZ8&feature=related
These are new in box,not used. Roto 25 V
DISPLACEMENT 24.9 ccm
STATTICENGIN THRUST 6,6kg
BORE 34mm
RPM 1500 -7800
WEIGH 1100 g/38.8 oz
PROPELLER 18/10
Design details.
Crankcase - Is roughcast before being machined on a CNC milling cutter, it is then powder coated.
Cylinder - Made from a single piece of dural with a pressed liner made from mild-granular cast iron, it is then sharpened and honed to size.
Piston - Cast from silicon alloy with one piston ring. The Small end for the 8 mm gudgeon pin is honed to finish.
Conrod - Is forged, with two needle bearings pressed into the conrod.
Crankshaft - Is a one-piece steel item, hardened, balanced to a high precision.
Back-plate - Is a cast item, which is hardened, shaped and then rolled.
Good news for pilots of .90-1.20-sized aircraft: the ROTO 25V/25cc gasoline engine is now available with electronic ignition.
Best regards,Shosho