Electric Surf Board

[Beachcruzer]

[youtube]Oz2edq7vbW4[/youtube]

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. :lol:
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

[youtube]zqZV9bYCCgU[/youtube]

 

[Cyclon]

Hey Matthias, no more news about your Jet surfboard?

 

[dirkdiggler]

Same here. I was excited about that. I'll post about my project. I do feel like he was behind the Lapanga? board that came out. Sorry no link, I can't find it anymore. I may have the name wrong. I just think that because he was German, probably no real connection.

 

[sk8norcal]

http://www.lampuga.de
http://wackyboards.blogspot.com/2010/02/electric-surfboard.html

[youtube]nePQzK9yWGc[/youtube]

 

[dirkdiggler]

Lampuga - Lapanga. At least I was somewhat close.
Thanks

 

[silentguy]

People have seen this :


http://www.jet-surf.com/


But it's gas.

I would want an electric version.
Something quieter.

Also its $40K or so .

A bit too expensive.

 

[odedelen]

Hi Matthias,

I have been following your thread with great interest!
I am looking to build an electric surfboard / wakeboard using this jet: http://www.mhz-powerboats.com/category- ... et-62.html
Using this ESC: http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=39032
I am also looking to use an 6 Kilowatt in-runner which does 520 RPM/V with 8s, that is ~16,000 RPM at the impeller!
I have tested the jet with the motor in the pool and it seems very strong.

What motor did you use? (What RPM per volt?)
which battery? (what voltage?)
Which ESC/controller? how many Amps peak?
What is the volume of your board? (how many litters?)
Was the jet strong enough to get you to planning on the water?
I saw your video with the young boy on the board. do you have another video with a full grown person riding it?

Great project!

 

[nessan1one]

I am wondering if a trolling motor (Minn Kota or other) will work with the jet unit?

 

[nessan1one]

I won't try to discourage your idea, but I would have started with a Kawasaki 550 jet ski pump.

What do you think about Yamaha Jet Ski Wave Raider pump?

 

[nessan1one]

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.

What would be the best motor? Is it any calculation? math or physics formulas for jet motor and pump?

Turnigy 80-100 ~$100
Turnigy CA120-70 Brushless Outrunner (100cc eq) ~$450
Turnigy RotoMax 150cc ~$420
PERM PMG-132 24-72V 19.1Hp 7.2kW ~$1000 25mph Sparky: https://www.youtube.com/watch?v=QYKE5hQnXbM
Maybe those??
New Guanlian 48v 1000w brushless dc motor ~$??? (will update)
80WD-M02430 ~$130 in China + shipping $130 to USA ??
110WD-M04020 ~$160 in China

=================================
Turnigy CA120-70 Brushless Outrunner (100cc eq) ~$450
Model: 120-70-15
Resistance: 0.004ohm
ESC Required: 250A
Input Voltage : 30~70V
Kv : 150 rpm/V
Weight: 2730g
Shaft: 10mm
20v Non Load Current: 13A @ 20v
Dimensions: 150x120x118mm (Including Mount)
Equivalent: 110cc Twin Gas Engine (20hp+)

Turnigy RotoMax 150cc ~$420
Battery: 14 Cell / 51.8V
RPM: 150kv
Max current: 190A
Watts: 9800w
No load current: 51.8V/5.2A
Internal resistance: 0.011 ohm
Weight: 2530g
Diameter of shaft: 10mm
Winding: 8T
Stator Pole: 24
Motor Pole: 20
Stator Diameter: 101
Lamination Tickness: 0.2mm
Suggested ESC: 250A 14S Compatible

Perm PMG-132 19.1HP ~$1000
Voltage: 24-72V
Weight: 24.8 lb
Angular-velocity constant: 50.2 rpm/V
Torque constant: 27 ozf·in/A
Terminal resistance: 0.025 Ohm
No-load current: 6A
Rotor Inertia: 1370 oz·in_
Inductance: 19 µH
Continuous current: 110A
10 minute current: 200A
Terminals: 8mm
48V Performance Peak efficiency: 86%
Peak power: 19.1 hp
No-load angular velocity: 2380 r/min
Stall current: 960 A
Stall torque: 25600 ozf·in
72 V Performance Peak efficiency: 88.6% *
Peak power: 34.3 hp
No-load angular velocity: 3590 r/min
Stall current: 1440 A
Stall torque: 38500 ozf·I
Voltage 24 36 48 60 72
Current 110 A 110 A 110 A 110 A 110 A
Power 2.2KW 3.5KW 4.7KW 5.97KW 7.22KW
Speed 1080 1700 2300 2870 3480
Torque 20.5Nm 20.5Nm 20.5Nm 20.5Nm 20.5Nm

 

[nessan1one]

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?

PVC jet unit
It looks like home-made PVC jet pump should work:

4 inch prop, 6-to-1 gearing ratio
8 horse power leopard motor - motor spooling up to maybe 30k rpm, looking at around 4-5k rpm at the prop (~350 usd)
4 blue 6s (5000 mAH each) lipo's ( 2 in parallel, 2 in series) - around 20 minutes at full thrust

https://www.youtube.com/watch?v=-2F7FhavFJg

 

[nessan1one]

PVC jet drive concept

What if I make jet pump connecting Changesun 120mm (64mm, 70mm, 85mm) Foam Planes Ducted Fan 4 0r 12 Blade EDF to PVC?? ($10-80)

120mm Duct Fan for most ducted fan Jet RC EDF 12 Blades
Weight : 550g
Color : Black
Material: nylon
Description:
-Outside Diameter: 128.2mm
-Rotor Diameter: 119.2mm blade
-Meterial: carbon fiber reinforced Nylon rotor
-Suitable motor 530KV-650KV for 12S
-Shaft adaptor to motor: 8mm
-Max RPM 28000RPM
-motor Diameter: 52mm

120mm Duct Fan for most ducted fan Jet RC EDF 4 blades
Weight : 330g
Color : Black
Material: nylon
Description:
-Outside Diameter: 129mm
-Rotor Diameter: 120mm blade
-Meterial: carbon fiber reinforced Nylon rotor
-Suitable motor 850KV-950KV 12S
-Shaft adaptor to motor: 8mm
-Max RPM 45000 RPM

 

[nessan1one]

Graupner Jet Propulsion Unit 5
Length approx. 285mm
Width approx. 78mm
Height approx. 85mm
Flange Diameter: 78mm
Shaft Diameter 7mm
Weight Approx 545g
Suitable power plants are internal combustion engines of 15 to 30 cc capacity, and electric motors rated at a minimum of 700 Watts output power.
we recommend one with an output torque of more than 5 kg/cm. If you wish to install the JET propulsion unit 5 in an AZIMUT ATLANTIC CHALLENGER and power it with an internal combustion engine, you will need to reinforce the hull with two layers of 300 g/m2 glass cloth, seal off the four stern openings by laminating glass
COST: $220

READ HERE: Jet Kayak RC components by mikebikerad http://endless-sphere.com/forums/viewtopic.php?f=39&t=33877#p491974

VIDEO: https://www.youtube.com/watch?v=b6qM2dVFUt0

 

[nessan1one]

Estimated project cost:

LiFePo4 battery 46V 10Ah ...... $200-300
Motor 48V 800-1000W ..........$200-300
Motor Controller .................$50-100

Jet Unit Kawasaki used ........ $50-100
Jet Unit Yamaha used .......... $200-300
Graupner Jet Propulsion Unit 5 ... $220

Surfboard ....................... $50-100

TOTAL: $550-1100 Is it possible to make it under $800? I would buy it for my kid...Great fun!

Kymera (? Hp)........................................ $1995

Seabob Cayago F7 Underwater Scooter 7 Hp ... ~$17200
Seabob F5 Underwater Scooter 3 Hp ............ ~$10700

X-160 Sea Scooter 300-350 Watts 24V ......... ~$200

 

[nessan1one]

LiFePO4 battery on eBay (November 2013) 48V 10Ah $237.50

 

[dirkdiggler]

I was working on one similar to what you have in mind. Never got the project done before the cold weather came. I was working on a old sit down wave runner. Figured that would be the cheapest way to try. If it got the wave runner moving at all I figure it would power the surfboard. Plus you have a waterproofed container to keep the electrics dry. I was having problems getting the motor connected to the jet shaft. A couple of versions I tried stripped out. I was using the 80-100 turnigy motor. That should output enough torque and RPM in theory. The surfjets are only using around 80cc and if you subtract all the extra weight of the ICE, it should be comparable. My machinist wasn't much help in getting a coupler done in time. The drive shaft of the motor is pretty soft metal and didn't handle the torque well. I did get one attempt in the water, which lasted about 30 seconds before it stripped.
I will be back at it in a few months when the snow melts.
Good luck on it.

 

[Kymera]

Well it took a lot of years, and a good beating on Shark Tank but it was all worth it! The week that followed I had a dozen offers on the table and now have everything we need including an all start crew to have our first units ready by spring. Now completing testing on the beta run, but so far we have reduced the power draw by 50% and increased the speed by 20%. http://youtu.be/vSobM4TWCBc New website will be up in a few days, along with a public announcement but our first run boards are already sold. Expect a second run by April. Thanks again!

Jason~

 

[sk8norcal]

Jason, I think u meant to post here,
http://endless-sphere.com/forums/viewtopic.php?f=39&t=48016&hilit=+kymera&p=818731#p818731

i see u guys didn't make it on ur 2nd kickstarter try.

but if you can still bring it to market, that's great!


btw, why not build a surfboard as well?

 

[nechaus]

I think I might try print the ducted tube parts and buy the prop separately, If I make the tube wall parts about 10mm, it should be strong enough...
This thread is very interesting, using the pvc pipes is a great idea..

If i can make something similar, I might try print a few of these and try and make a multi motor kayak that i have been wanting to do for ages..
I want to try and bring the cost down. Using the pvc pipes makes it so much lighter.

Edit,
Id like to add lots of bearing supports so the shaft can be mounted well, Also printing the motor mount would be good to keep the weight down.

im getting to the drawing board

 

[nechaus]

somebody made one already, a small printed jet drive

[youtube]IfzsSC7RhS4[/youtube]

 

[nessan1one]

It should be a lot of fun!

 

[nessan1one]

Battery...

 

[nechaus]

rc jet boat drive

[youtube]iJIFiM74xps[/youtube]