revelle kit bought of ebay for £5.00 sailed it in my pond where it is very smooth. it sails ok but needs better ballasting as centre of gravity is causeing it to lean a bit. useing 40 MHz mini receiver and mini lipo battery as shown in photo. glad I built it though hope you like it to. (Motor: mfa 3-9v re140 No457) (ESC: chinese type 10amp) (8/10)