My Model is some 20 to 25 or more years young & wore out two .35 glo motors over the years & only has a 1/8 inch only steel, drive shaft which I recently replaced & always used a leather washer (no metal noise) between the drive plates as modelled from the old 'Taplin Twin' type (never torn) & I updated to a SC .40 Glo motor not for speed but just as a plodder, hand starts with chord are easy & if you use electric starter loosen the glow plug in the thread when starting and it WILL fire & run at idle & disconnect glo lead and screw in plug and take to water etc. MY model actually weighs some 20 to 22 pounds.(I could not delete the 176 ounces in the table above) & exhausts from the factory muffler into a tin can resonator & is super quiet out the stern & no nitro & water pipe is wrapped around muffler which in cooling takes away noise energy. Lyle (Motor: Sc .40 r/c & I/C motor (quiet)) (ESC: Sanwa) (10/10)