cheers for the info on props. i have been to my local model shop and they can order in some opposing props, but it may take a little while to get them. i have decided that i am going to run the boat on a single engine, the centre one, but upgrade it to a 540 electric instead of the one that is in there. i think it is a 340/360. unfortunatley there are no markings on the motors to be able to tell what they actually are. also, i am going to up the size of the prop itself, from M4X30 to an M4X35. i want to keep the outer props and shafts in place for asphetic reasons, as it will probably be on a shelf on display most of the time. if i go to a 40mm prop, i think it'll interfere with the outer props. plus, i can always go back to the original plan of running on the outer engines in the future.
i'm just about to start painting it now

, so i will post some pics when it is finish.
cheers for the help.
simon