15,000 watt kayak????

[obrien008]

Ive always been wanting to add some motors to a kayak. Im just looking to see what anyone with some experience would have to say about how it might run.

Im not saying that it will work but looking at how a 12V Trolling motor on only a few amps can push a 10' Bass boat around the pond would it be unreasonable to think that the following setup might have a little bit of speed?

If it did, how overworked would the escs or motors be if at all?

I was thinking those huge Turingy motors from HK that someone had used for a go cart.

Proposed Setup: Two Submerged Drives, Stingers or Struts Under the Kayak

2x Turnigy 80-100-A 180KV Outrunners
2x Sentillion 200A HV ESC
12s 18,000mAH 35C (12s4p 4500mah)
2x Either Octura x482s or x670s
2x C.R. 0.250 Flex Cables

Would be about at 8600RPM

I also found a coupler that I could use for this motor with a built in adjustable slip clutch, or I could just use the soft start function on the esc.

I would think that id probably need bigger props, but then again they might be too big if they are submerged, maybe 100mm props?

Well let me know what you guys think about the idea.


http://www.hobbyking.com/hobbyking/s...ner_(eq:_70-55)

http://www.hobbyking.com/hobbyking/s...dProduct=10332

[Basstronics]

I seen something of a jet drive gas powered kayak somewhere. Cant remember who made them though.

I wouldnt use hobby stuff, why not use a trolling motor?

[FighterCat57]

I have a friend who is a Scout Dad, lives on a lake and would absolutely love a remote control Kayak to run the kids around the lake.

I've thought of this and am still considering, but working on smaller projects and building more knowledge about electric boats before tackling something that big.

Very cool idea.

[Rumdog]

posted this a while back:http://forums.offshoreelectrics.com/...ad.php?t=15281

[befu]

If you wan to use the turnigy motors to experiment with brushless, you could go that route. Either single or dual, I would go with one prop, more efficient. I would also look at trolling motor props, they are designed for thrust, more like a freighter prop than a high speed prop like the X482. You are going to need efficiency and thrust more than top speed. Maybe, i have never seen a kayak plane out.....

Talk to some of the scale guys on RCU or RCGroups. You are basically talking about a tugboat setup, but trying to push a 200 to 250 lb load (????) but with a hydrodynamic hull form.

As far as wattage goes, I think you would be surprised how little you would need. Using the numbers of a human cyclist in good shape riding for a long time (hours). They can generate 100 to 120 watts continously. Now that is with thier legs. How much power can you generate with your arms? I would guess less.

Maybe look up to see what others have done with trolling motors on kayaks or canoes. Then set some parameters. How long do I want it to work, how fast do I want it to go? Is it something to assist my paddling or replace it? These are all things that need answers before you start.

Now, on the motor you are talking about, they are specked for up to 7000 watts. lets go conservative and say you use 54% of that. That is the same as bolting a 5hp outboard onto your kayak! And you were looking at two? Looks like a recipe for a darwin award........

Go buy a trolling motor and try it first, see how it goes. maybe tear it apart and mount it under the stern, remote wire it to hand controls, do you have a rudder control?

I think you would get going pretty fast with 150 watts or so. As fast as what you could sprint paddle for.

[befu]

posted this a while back:http://forums.offshoreelectrics.com/...ad.php?t=15281

There you go, 6mph on 200 watts as a baseline. Have you ever timed yourself paddling?

Brian

P.S. remember you are now a motor craft and need to be registered if on public waterways. Even electric!

[obrien008]

Ya 6mph is better then nothing, but It would be cool to have something that went 20, is that reasonable? That video rumdog put up is atleast 6 on only 200W? I would think you could get atleast 20 out on it?????

[befu]

Ya 6mph is better then nothing, but It would be cool to have something that went 20, is that reasonable? That video rumdog put up is atleast 6 on only 200W? I would think you could get atleast 20 out on it?????

Take a gps and see how fast you can paddle at an average speed and for a sprint. That will give you a rough idea on wattage. Then you have oars vs. prop, but that is the fun of experimenting.

Brian

[Jeff Wohlt]

$100 minkota trolling motor then cut off and mount the motor and then use the guts such as the speed control, etc and you are good to go. Samll pack or a bank of cheap lipos in para. I would go for the smaller lawn tractor batt in a box or even 2 and para them for plenty of power.

Have you looked at what they are doing with weedeaters for boat motors? Pretty cool!

Whoopps..already posted....I would cut the shaft short and go thru the kayak behind you and use a grommet or a seal for the bottom and leave the rest on top so all stays the same...basically a 18" trolling motor. Yes, it would boogie! The newer trolling motors are VERY strong...you can even prop up since there would be very little load.

[Basstronics]

Yanno they make a canoe now with a flat back for upto a 5HP motor?

I would just put the trolling motor behind the yak and rig up steering inside it.

I understand you would like to use your hobby experience but its not practical or cost effective.

[obrien008]

I got some old trolling motors but those are too slow, I want something that would be alot faster then that, theres some 3500W boats on youtube that really move.

I was thinking about building a 9-12' catamaran type boat instead of the kayak and put the mentioned setup in it. I dont see why a boat with 2 of those turingy motors off a .250 flex cable on 82mm props wouldnt be able to get the boat up on plane. Let me find the vid of the 3500W boat.

http://www.youtube.com/watch#!v=NLCa9qqB8SE&feature=related

[Jeff Wohlt]

I like this design http://www.youtube.com/watch?v=bdZoR-lg04U&feature=fvw

[lomdel]

Just Google : "Powered Kayak" or go to http://www.jet-kayak.com/jetkayakadventurer.html . Its been done...

[obrien008]

Wow those kayaks are awesome haha. Thats more of the speed I would want if I were to put the time and money into it.

Would two 7000W outruners be able to get you near that speed running two submerged 82mm props? Its says that they are equivalent to 80cc gas engines apeice, that would be 160cc equivalent which would be more then enough, but would that translate to speed, and would it be too much stress on the ESC?

[CatMan]

alot depends on what type of kayak your using, Recreational kayaks are a displacement hull, while most whitewater kayaks have a planing hull, I have been pulled behind ski boat in my whitewater boat and once you get around 15mph or above the nose will bounce up and down too much and gets worse the faster you go. it doesnt take much speed for them to "plane out" typically the longer the boat the faster it is. My kayaks are 6 to 7 1/2 ft. long. Sorry dont know anything about rc boats (Just got my 1st. one) but have been whitewater kayaking for 13 years. would like to see pics if you ever do this.