Electric Surf Board

[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

[Ratking]

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.

[Bazaki]

So a jet motor is directly to the crankshaft ? Then we don't need to rewind the Turnigy's, that is good

[Hillhater]

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

[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?

[Ratking]

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?

[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

[Matthias_S]

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 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?

[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 !

[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

[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

[Hugues]

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.

[Matthias_S]

some testing with the old jet pump
http://www.youtube.com/watch?v=g4pnXOEGk0g&feature=plcp

[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 http://www.youtube.com/watch?v=hwG3qxtI ... el&list=UL

[Matthias_S]

kymera is absolutely amazing
I hope so much to get similar results

[parmenps]

how machts watt is that motor?

[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

[sk8norcal]

http://www.wackyboards.blogspot.com/201 ... board.html
http://www.wackyboards.blogspot.com/201 ... ofoil.html

[pendragon8000]

well done Matthias_S, good luck with the new pump.
keep us posted

[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

[Beachcruzer]

Here's a guy surfing a 45-foot face with an electric-powered board. $4,000 but if you surf waves this big they'll give you one for free.

[dirkdiggler]

If I was Garrett, I wouldn't bother. It's probably a bit more fun to ride that 100 footer in Portugal.
That WaveJet is a nice setup. The 4k throws me off and the speeds are just meant to get you out in the surf though. I want something that will go 20mph or more to ride lakewater not waves. I think the wavejet only goes around 12. You might be able to change out the motors/batteries on them though, which could make it worthwhile.
I do think these big wave surfers would love to not have to be towed into waves. If they had a board that went 20mph they could paddle into more of them.

[sk8norcal]

I want something that will go 20mph or more to ride lakewater not waves.

this one is from Taiwan
http://www.justwin.com.tw/products_detail.php?id=24