monsterbombs

i bought a toy boat for about $30 and put my rc car gear in. the stock
motor was weak so i put a 3.6v johnson out of a riobi cordless screwdriver.
it runs on 5 cells my question is,even if im cruising i hit full throttle and it flips/capsize.
I assume it just has too much power and is rotating the boat instead of the prop.
it has a little fin at the bottom,i was thinking of extending it downward like a sailboat,
to give it more stability. it is powerful and quite quick but when it flips it gets full of water.
heres a pic with the old stuff next to it. cheers.

mfr02

With a motor far more powerful than the hull maker intended, flipping is perfectly reasonable. Every action does, as Newton noted, have and equal and opposite reaction.
Your proposed fin might work, a trim tab on the transom might work.

monsterbombs

the other thing is the weight/position of the batteries. this thing was designed to run on
6 AA batteries,not 5 sub-c batteries. they sit pretty much right on top of the boat too.
maybe if they where in the hull? and less cells? as i said though it cruises well, but if you
dump the throttle she rolls.cheers.

monsterbombs

ok well no ones really biting on this. seeing as the hull was filling up
with water and the esc and reciever were not working when wet, i
waterproofed it. the esc is in a plastic bag ziptied, and the reciever
i pulled out of its case and melted wax all over it. here are some pics.
i tested it in my bath.it runs on 3 cells now inside the hull,not on top.
Under heavy throttle she goes straight.[8D]runs completely submerged.
it only stops when water bridges the 2 contacts of the crystal. pull
the crystal out,blow, keep going.this boat has still cost me pretty much
nothing.now runs completly under water.
reciever before:


reciever after:


esc: