I think the first jet drive system is best for my application. I think it will work great even without any reverse mechanism. I assume that I can control two of these like skid steering a rover for turning right and left with a motor controller. I’ll add a homemade antenna of some sort to extend it above the water.
I hope only two jet drive systems will be able to push this beast. Im estimating this to be about 10lbs.
Hmm, well it says:
So, if your boat is under 24" then it should to excellent! You would also need to make a custom mount (probably with a servo) to turn it so you can steer.
As for the reverse mech. They sell a few, and you can make your own by modeling them I think. Just take a sheet of metal and make it into a scoop like that.
hmmm… I was thinking instead of turning the jets to turn the bot, I could just power one motor instead of the other to turn it right/left. If not, Ill put two rudders controlled by servos to steer the water pressure to either end to turn the bot. Im making changes to the design as we speak. I am hoping to start this build sometime this summer when I have a job and access to my neighboors pool. 
I think turning the jets them selves would yield better maneuverability (biggg word). You may need to add weight to your boaty because them jets may be tooo powerful for your 10lb craft. Or you could adjust the speed controller to make 'em go slower… but youl lose the race then 
!
Can’t wait to see the new designs 
Oh, before you do a lot of work redesigning it, contact the supplier if they ship to canada and how much shipping would be (to adjust your budget). Also see if you can get any datasheets or other info such as power about that unit. Its good to know how powerful your propulsion will be!
yep will do.
I still dont know about turning the gets though becuse this would have to cut out slits in the back where the jets are so they are able to move. Then water would engulf the inside of the hull 
To get a better idea of how to design this craft, I would suggest searching online on how Jet Skis work. Youl get a good idea of how their hulls are designs and how you can make yours.
from reading an article it says the nosel swivels to provide steering, but im not sure how this is done as it looks fixed to the motor…I can find any information of how this is done and how the hull is setup to prevent water intake into the hull.
the nose is fixed to the motor 
…wat? a water ski have an intake scoop on the bottom, the steering itself is controlled by the water taken through the scoop
the watter is thrusted through by the motor and it is directed by a funnel sort of thing, and turning the handles bars makes this funnel sort of thing turn, redirecting the water
Try modified bilge pumps for motors.
I saw something like this, but im not sure how the heck its going to work. Bassically I would need 4-5 bilge pumps (2 back, 2 right/left, maybe 1 front). The only problem is controlling these pumps.
Chunga, I cant seem to find any info on how to turn the jets to direct the water for turning. IDK this kind of stuff wouldnt be on the internet…
i think they have the turning mechanism pre built into the jet drives that robodude posted ill looks again and tell you
EDIT: yes the 2nd drive from the top (the first white one, has the thurst control pipe hooked up already, and if you look closely u can even see the little piece where the servo attaches to control the left and right movement of the tube 
this would work perfect for you, u can use 1 torquey servo and control duel jet drives with a simple linkage between the 2 and u dont have to worry about synchronizing them
nvm i lied about the linkage thing, the little servo attachy peices are facing different dirrections than i thought
hehehe, well I still dont see them. 
But from what you are saying each jet has 1 servo to move it? Will this servo be inside the boat or outside?
well, im sure with a bit of inginuity u could find a way to make a linkage to make the drives turn in the same direction at the same time, which would be a hell of a lot easier then trying to turn them in the same direction accuratly with a servo on each one
I could use a Y adapter and turn them simoltaniously (sp?). That would be a simple as connecting them to the reciever. I still dont know though, if these things turn, im not sure how to acomodate a space large enough for them to move without intaking water into the hull. I was hoping steering could have been done with “skid style” driving, but robot dude told me im better off not doing it that way…
I originally got that idea when I saw a submarine made of PVC pipe use bilge pumps to move the bot. I was hoping I can use that method of steering with this method of propulsion. I have high hopes that I can.
If not, rudders would also work by attaching them to the front of each motor and have each rudder with one servo connected with a Y adapter and attached to the reciever. Where as the other motors would be attached to the motor controller and than the reciever giving me the ability to use the same style of robot steering on my hitec controller.
i think the y adapter would work, also with the hole in the hull, the control tubing would go outside the boat
do u see that lip after the white piece on the tubing and then it goes skinny for a little bit and then theres another lip? i assume where the second lip is removable from there, and u would drill a hole as large as the skinny part inbetween the 2 lips, unscrew the second lip and then place it into the hole that u previously drilled then screw the second lip bac on
if u dont understand wat i just said ill try and clarify it better
Yeah that will work…as soon as I understand
ok, the lip of the the white part, to the right of that see how it gets sknny? thatis where the hull will fit onto
got that? and the 2 lips on either side of it will keep water from getting in used with some cawking
ok, but dont forget im using: Mini JET Drive … $ 38.70
oh, ok, lol, idk then, ill have to stare at it for 10 min like i did with the other one
