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toy boat capsizes from throttle

Old 03-04-2010, 02:57 AM
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monsterbombs
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Default toy boat capsizes from throttle

newb question.
i have a toy boat with a 540 motor in instead of the 300
size can it came with. am i dreaming or is this thing going
to capsize every time i accelerate? even accelerating slowly
she is leaning pretty badly. the boat is small and the fin on the
bottom of the boat is smaller that a guitar pic.

im thinking of making a longer bottom fin. the motor is a
drill motor and its running 2s so the rpms down low are good
and more than enough to use full throttle. its a bit of a backyard
job that i gave up on ages ago and just pulled it out yesterday.
it cost me nothing, i could be wasting my time but it would be
cool to get it running.

my camera is flat but i dug this up. this is the boat and my "attempt"
at doing it up. "water cooled" upgraded to a 400 size johnson.
all that boat dig was fill my boots up with water from numerous retrievals.
regardless its fixed now and done half well, even if i did waste half a day.

help appreciated cheers.



worst photo ever [:@]
Old 03-04-2010, 01:28 PM
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Justaddwata
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Default RE: toy boat capsizes from throttle

Interesting project you have yourself there

I by no means profess to be that knowledgeable when it comes to the electrics. I did build a few boats along the lines of what you have there - not much beyond that.

I am not sure where you are installing the battery pack but I would recommend installing it toward the side of the boat that is rolling up. This may help offset the torque roll you are seeing.

What prop are you using? do you have other props - a prop with less pitch (a lower angle that will be easier to turn) may tend to roll the boat a little less.

If that is a filter (red) you have installed in the cooling line I would recommend removing it - no need to filter cooling water - it will block and then you will have no cooling.

Keep us in the loop as to how you make out and be sure to take more pics (or better yet - Video!!)

Matt
Old 03-05-2010, 04:20 AM
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monsterbombs
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Default RE: toy boat capsizes from throttle

thanks for the reply.
the pic is embarrassing. the whole system didn't flow
anyway and the filter was there as a joiner, because i
ran out of nitro fuel line which was too small anyway.

everything is blocked off now and its just a big 540 drill motor
up front, a 80a esc from a cheap crawler i water proofed and
a 2s lipo "receiver" pack (its tiny) i also water proofed.

did some research last night on "torque roll" . long story short
(like you mentioned) i moved all of the weight -(esc,batt,reciever)
to the left. i tested it in my tub and it sits pretty deep on the port side
but evens up under throttle.

during testing and obvious urge to test the limits, the pressed plastic
prop started slipping. i drilled it with a 2.5mm bit, put a grub screw and ground a
flat edge on the shaft. took it in a mates pool and this thing hauls ass. [X(]
turning is a bit of an issue and my mates pool is more of a swampy puddle
than a pool but i am impressed. need more testing and more water to do it in.
i will try to charge the camera for some pics.

cheers,
monster.
Old 03-05-2010, 06:26 AM
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Default RE: toy boat capsizes from throttle

Funny you mention the swampy puddle - I remember as a kid running a small electric boat in a puddle in a parking lot when I lived in Perth. Wish my parents had taken pics of it.

The pic is nothing to be embarrassed by. If nothing else - it might be something to look back at years from now to show where you started out

Good to hear you were able to get her out on the water and not turn her over. Steering is often a bit of a challenge when you crank up the power - the movement of weight within the hull only ads to the challenge. All part of the fun (thank goodness we are working with boats and not planes or helicopters - I hate to think about some of those setups).

Look forward to seeing some more pics.
Old 03-05-2010, 04:24 PM
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R.J. West
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Default RE: toy boat capsizes from throttle



I understand what your trying to do, but alot of those cheap kiddie boats dont take well to modifications. When you say "capsizing" do you mean that it tries to roll over or rock side to side at speed? If so then thats called "Chine walk", and if thats the case then your beyond that boats capabilities as designed...
Try this;
With something like that makesure toremove any unnecessary plastic supports and any electronics you dont need, only focus on the rudder servo/mount/linkage, the motor and driveline, esc, reciever etc. keep the battery against the hull bottom and keep it up front, secure it with velcro. I dont know what the top hatch/deck of your boat looks like but I would remove anything cosmetic and just use it as a hatch to keep water from coming inside...

Old 03-05-2010, 09:03 PM
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monsterbombs
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Default RE: toy boat capsizes from throttle

everything is minimal i have made sure of that, maybe the spoiler thingo
on the hatch can go but shes is light as possible. i used a micro 1/18 plastic
servo that weighs as much as an ants fart .

moving the weight to the front isnt really an option. there is a drill motor
pulling the front end down as it is, rather badly. she has enough "go" to pull
out and plane on top of the water, thats when i run out of muddy puddle.lol.

i need a full pool to get the steering and that sorted, might hit the river.
need to secure the electrics, and last night during testing the prop shaft
let go (jb weld). i will fix that and have it stronger hopefully.

i have been doing research on "nikko/toy conversions" and theres not many.
probably for good reason. [] anyway it has been fun so far, cost me nothing
and looks pretty promising.

thanks for the comments heres the boat-
(apology's for the ordinary photos) [:@]

top shot-


stern? shot-


the beast of a motor and my homebrew shaft (jb weld,pinion and an old antenna)-
the motor mount is off a tamiya drift car.


what she actually looks like complete-


size reference shot with the tq transmitter, pretty small-


and i found another old image of what it used to be-
what a mess -
Old 03-06-2010, 07:29 PM
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cyclops2
 
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Default RE: toy boat capsizes from throttle


higher power & a high mounted motor in the bow. Getting HIGHER as you go on plane. With it in the bow & high, it WILL cause a top heavy roll over condition.
Put the original motor back in & use the biggie in a longer & or wider boat.
Old 03-08-2010, 01:16 AM
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R.J. West
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Default RE: toy boat capsizes from throttle

As a thought you may consider using an Octura strudder, it will put your prop and rudder out behind the transom instead of under the hull like that and will give the boat alittle bit more stability by forcing that front end down a bit. That drill motor may beOVERKILLfor that small of a hull. [img]file:///C:/Users/Ron/Pictures/rock2.gif[/img]
Try a 12-18 turn 05 car motor, a octura X427 and a 6 cell battery pack instead. Heres a pic of a Octura strudder, look for a aluminum one with a 1/8 strut hub...
Attached Thumbnails Click image for larger version

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Old 03-08-2010, 03:06 AM
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monsterbombs
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Default RE: toy boat capsizes from throttle

thanks for the idea,
sounds like a bit of overkill for my 30 buck toy
boat though. i dont really want to be spending
cash on rc's at the moment, thats why i used
what i had lying around.

i keep calling it a 540 motor but it is actually a 550.
a 540 motor would be good i think a 27t or a silver
can. a six cell is out of the question due to weight
and size. my lipo is tiny and weighs very little.

the ideas are great and you guys obviously know
what your talking about and i dont. im going to try
and work what ive got and hopefully chalk it to the
nay-sayers.

more ideas and comments would be great, i jb welded
the shaft this afternoon hopefully some progress this week.
you can actually see where it had broken in the third pic.

cheers.

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