toy boat conversion
 

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.
http://i735.photobucket.com/albums/w...n/DSC00210.jpg

RE: toy boat conversion
 

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.

RE: toy boat conversion
 

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.

RE: toy boat conversion
 

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:
http://i735.photobucket.com/albums/w...n/DSC00211.jpg

reciever after:
http://i735.photobucket.com/albums/w...n/DSC00212.jpg

esc:
http://i735.photobucket.com/albums/w...n/DSC00214.jpg