sorry to bore everyone with repeated info, as a similar question was posed recently. I agree with the fact that shaft is too thin, it very much looks llike a fibreglass
very light racing boat
set up, now this doesnt mean you cant go fast with your boat, but you need components that are up to lugging a big heavy lump of wood around the pond, not a lightweight
I have 5mm shafts, less whipping. and I have oilers so they are lubricated with oil rather than grease, just my preference. You can get these shafts from shg marine, they will supply with push in aceteal (probably spelt wrong!) water lubricated bearing
s, real cheap, so you can change then every season if you want. The shaft has to be supported, where it exits the hull, just put it through another piece of ply, and fill the void with epoxy
, and double up the former
thingy it goes through in the same way. (pic)
The prop you used is the wrong blade type, thats probaly why it fell apart, plus the soldered on blades are a weak design for higher speed, simon higging is one piece, but at this stage, still testing, you can get plastic "x" blade ("s" blade are less speed)_ props again from shg marine for a few quid each, then you can test a few different sizes. if you jump in for an expensive brass one, and its wrong, its wasted money.
As a starting point, 35mm, 40mm and 45mm, if you dont have any way of testing with data logging etc, you are doing short runs, with the smallest first, and seeing if the motor
gets hot etc, and what sort of speed you are doing.
My brushless motor
s are generally 800 to 900kv, and achieve 25mph in four foot heavy hulls, you want lower kv for torque, not high kv high rev motor
s. I got into thsi 10 years ago, thwere was NO advice
around then as it was new tech in boats so I learnt the hard way😭
When (if) you go to a brass prop
, the "cleaver" blade design (pic) works well, I did extensive testing with my Huntsman and fireboat
and was lucky enough to have Simon Higgins testing props with me on my boats, again because what I was doing, large scale boats, but going very fast, was unique, and the cleaver design was the best at the time.
Forget the fear of lipo, and brushless
, they go as slow as your throttle stick is pushed, 👍