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Re: Electric Surf Board

Posted: Jul 30 2012 5:16pm
by Matthias_S
The jet pump dosnĀ“t produce enought trust.. I will get one of this kawasaki pumps and hope to get more trust.

One of my fist electric boards:
http://www.youtube.com/watch?v=s9PRm23j ... e=youtu.be

Re: Electric Surf Board

Posted: Jul 30 2012 11:15pm
by mr.electric
It looks pretty good on the YouTube video. I can see how you want more thrust but it is comendable that you follwed through and got the first one working

Re: Electric Surf Board

Posted: Jul 31 2012 7:09am
by mr.electric
To make a quick and dirty evsurfboard would a cheap 12v trolling motor work. I can see how rolling in a wave and getting hit with either a heavy jet drive or a prop and heavy motor could be deadly. A screen mesh cage around the prop would make the prop safer.
The ultimate safety would be an RC boat drive system built into a board. Since those parts are light weight and small they would hurt less if you got hit by your own board in a rolling wave. Buy r/c boat motor, esc , prop and prop shaft and install in a hollowed out spot in the board. Prop shafts and props could end right before or after the surf board fins. finally put a small cage around the props.

Re: Electric Surf Board

Posted: Jul 31 2012 9:00am
by Ratking
Being hit by a water jet is no problem. I would rather have ten jet ski jets on my body for an hour than a second in a sharp propeller, no doubt. I've been playing with high performance stand ups and I have never been hurt by the jet. Just forget everything else than a proper jet with both a impeller and a stator. And lots of power if you want to get out of the water.

My opinion is that propellers do not belong amongst people :)

Good work Matthias_S, I hope you will try with another pump. If it works good I will try it myself :wink:

Re: Electric Surf Board

Posted: Jul 31 2012 9:24am
by Ratking
This site shows a ice powered board.
Looks like lots of fun, easy to transport and unique.

I am seriously looking for a windsurfing board now. Would need a lot of motor to compete with a ice, but could try with two or three 80-100 as a start :D

Edit; Forgot to provide the link: http://www.powerski.com/content/psi_index.php

Re: Electric Surf Board

Posted: Jul 31 2012 9:37am
by Bazaki
Very nice video ! I hope you will continue this project. Does anyone know the rpm of a jet prop of a jetski ? A boat prop is about 2500 rpm I thought

Re: Electric Surf Board

Posted: Jul 31 2012 10:16am
by Ratking
Bazaki wrote:Very nice video ! I hope you will continue this project. Does anyone know the rpm of a jet prop of a jetski ? A boat prop is about 2500 rpm I thought
I know that most of the stand up jet skis using 701-750 ccm motors have rpm limit around 7500 rpm.
Thats why someone have to link a few of the 80-100 180kv motors togheter and try combined with hv160. That gives 8500 unloaded. That's perfect for a ice replacement.

Re: Electric Surf Board

Posted: Jul 31 2012 1:45pm
by Bazaki
So a jet motor is directly to the crankshaft ? Then we don't need to rewind the Turnigy's, that is good

Re: Electric Surf Board

Posted: Aug 01 2012 12:56am
by Hillhater
Bazaki wrote:So a jet motor is directly to the crankshaft ? Then we don't need to rewind the Turnigy's, that is good
If you expect anything like effective performance or efficiency, the waterjet impeller pitch and diameter needs to be carefully matched to the motor power and target hull speed ...just like a prop drive.

Also be aware that impeller and housing condition, and peripheral gap, is absolutely critical to a jetdrive operation. A worn impeller or housing can result in total loss of performance, so be careful when buying a used jet unit

Re: Electric Surf Board

Posted: Aug 02 2012 7:52am
by Matthias_S
I bought a kawasaki 550 jetpump. I will test how much trust I get with one turnigy 80-100.
My goal is to reach planing speed. Dont know how much trust I need to reach it? I think more than 200lbs..?

Does anyone know how much trust a kawasaki 550 produce?

Re: Electric Surf Board

Posted: Aug 02 2012 11:25am
by Ratking
Matthias_S wrote:I bought a kawasaki 550 jetpump. I will test how much trust I get with one turnigy 80-100.
My goal is to reach planing speed. Dont know how much trust I need to reach it? I think more than 200lbs..?

Does anyone know how much trust a kawasaki 550 produce?

Some guy that supposedly know his stuff said that you will get 1hp out of the pump for every 1kw you put in. I don't know if that is spot on, but may be.

The kawaski 550 have 37hp stock and put out 360lbs of thrust. If we divide the thrust produced by motor hp we get 9.2 lbs of thrust per hp. Maybe you motor can provide peaks of 8hp, so let say max thrust out of the pump will be 73.6 lbs, or 33.4kg of thrust. That's not a lot, but may be enough for a surfboard?

Re: Electric Surf Board

Posted: Aug 02 2012 11:31am
by Ratking
I would like to say hat maybe you can use the torque that the electric motor have to your advantage by using a steeper pitch on the impeller. I have not been able to find what kind of torque a original 550 motor produces, so his is highly experimental :wink:

Re: Electric Surf Board

Posted: Aug 02 2012 6:30pm
by Matthias_S
Ratking wrote:
Some guy that supposedly know his stuff said that you will get 1hp out of the pump for every 1kw you put in. I don't know if that is spot on, but may be.

The kawaski 550 have 37hp stock and put out 360lbs of thrust. If we divide the thrust produced by motor hp we get 9.2 lbs of thrust per hp. Maybe you motor can provide peaks of 8hp, so let say max thrust out of the pump will be 73.6 lbs, or 33.4kg of thrust. That's not a lot, but may be enough for a surfboard?

Thank you :D Cant wait to get this thing tested! Its really hard to tell how much trust to get out of this combo but your informations are really interessting!
btw this is the pump I bought: http://www.ebay.com/itm/140808392811?_t ... IT&vxp=mtr

Yes I hope that the produced trust is enought to reach planing speed..
Does anyone know what happens on planing speed, because of the much lower friction the motor amps must be also lower, isnt it?

Re: Electric Surf Board

Posted: Aug 03 2012 12:27am
by Hugues
Hi Matthias,

I'm following your project, very interesting, I might try this too.

Have you thought about using foils to lift the board out of the water ?

It does not take so much power i think. There is a kayak with foil and a well trained person can lift it out of water with paddling only, I think it called the flyak or something like this.

Great idea you have !

Re: Electric Surf Board

Posted: Aug 03 2012 4:58pm
by Bazaki
Just when I thought I have seen it all....
http://www.boreme.com/posting.php?id=18518

Amazing with how less energy these speeds can be reached at the water, new food for new idea's here :D

Re: Electric Surf Board

Posted: Aug 04 2012 6:19pm
by Matthias_S
There is a lot of potential in hydrofoil but whit my jet pump it is not so easy to realize this.
There is already an electric hydrofoil out there..
http://www.youtube.com/watch?v=jh_RhkejWLw&pxtry=1

Re: Electric Surf Board

Posted: Aug 05 2012 4:12am
by Hugues
Matthias_S wrote:There is a lot of potential in hydrofoil but whit my jet pump it is not so easy to realize this.
There is already an electric hydrofoil out there..
http://www.youtube.com/watch?v=jh_RhkejWLw&pxtry=1
thanks for the link, this is the kind of project i had in mind,
they say it's only 1 HP ??
i tried to find more technical info on their site, but one of them is returning an error,
and the other does not return any results

but thanks a lot for the video.

Re: Electric Surf Board

Posted: Aug 05 2012 6:05am
by Matthias_S

Re: Electric Surf Board

Posted: Aug 05 2012 12:52pm
by Bazaki
Very nice, it can be done for sure ! Keep on going and I hope you will end up like this or I hope a bit faster :D http://www.youtube.com/watch?v=hwG3qxtI ... el&list=UL

Re: Electric Surf Board

Posted: Aug 05 2012 1:05pm
by Matthias_S
kymera is absolutely amazing :D
I hope so much to get similar results

Re: Electric Surf Board

Posted: Nov 15 2012 4:09pm
by parmenps
how machts watt is that motor?

Re: Electric Surf Board

Posted: Dec 10 2012 7:25pm
by dirkdiggler
What is the latest on this project? I watched the videos and it looked like it would work well. I am curious what battery and motor setup you are using. After finding out the price and performance of the gas powered surf board, I want to build one for myself.
Thanks,
Digg

Re: Electric Surf Board

Posted: Dec 16 2012 2:45am
by sk8norcal

Re: Electric Surf Board

Posted: Dec 16 2012 5:06am
by pendragon8000
well done Matthias_S, good luck with the new pump.
keep us posted :)

Re: Electric Surf Board

Posted: Jan 28 2013 11:41pm
by dirkdiggler
Here's an old vid someone linked me to on one of my other projects (mini RC surfers). Sorry if it has been posted before.
http://www.youtube.com/watch?feature=pl ... NfwuM99mrk