That’s the biggest limitation, the others are easy enough to work around. But if you turn the motor or use 2 motors you will end up with options for stationary turning.
Great words lads ! We’ll all get there Im sure… Thankyou for the feedback and experience strongarm re the rudder - I expected as much and you’ve saved me a lot of time. Its firmed up the differential Twin side by side motors solution.
There is some more video of the ‘Tow Bogan’ in chop here on youtube here
https://youtu.be/nzSPHpzYOo0
- This was filmed into about a 12- 15knot headwind in port phillip bay, Melbourne, Guys were kiting (just enough wind), Video makes everything look small, but the Chop was about 30cm high at times, (15cm above level and 15cm below)… Quite short and sharp/Steep too which is typical of our bay conditions . Im really happy with the chop performance of this hull design - its basically the same as an ocean race boat
If only I’d looked at that shape first it would have saved a lot of tests…
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Looks great, thanks for sharing!
Because you are down the offshore boat rabbit hole, I wondered if you considered surface piercing props? lots of interesting benefits, and drawbacks. Most of all I would hope it would handle re-engaging the props better after ramping a wave
Surface Piercing props ! Now they would be perfect. Where do you get such a thing and are they available in Mirrored rotation?
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Ok - Couple more pictures of the Tow Bogan build… Lot of work on ‘Self righting’ after a bunch of great surf sessions on the v1, its time to build a mould and get it to roll back over after clean up sets. These Pics are the 'Plug - Im going for a full solid hollow Fibreglass hull with pre inserted 316 stainless bolt up mounts, Draining or ballast bung - Sealed independent battery cavity - the lot. Something you can adapt to the various motors and motor mounts out there.
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If you are making a mould, count me in for one 
Shipping to UK?
Some ideas:
For a surface piercing, I think there is probably a lot of experimentation to get it anywhere, possibly running oversized props for more bite, as I think they main issue with them will be lack of low end
Here is my sketch for boogie that I plan to try.
Wave piercing: I think this is possibly a good direction. If it goes through waves, you have less cavitation to worry about!
Self righting: I wonder if you might try a flood chamber, will cause it to self-right more quickly, and you can simplify the design / make it sleeker to punch through waves
Surface piercing props are notoriously bad for tow boats as they lose the extra bite from the prop. They excellent for racing boats though.
The issue with this is the resistance will force you to stall the foil. The size of the tow setup means its far to light to pierce through a wave or chop while towing.
I think both of those issues are likely overcome initially by rider skill initially and tinkering eventually.
I use only 60% of throttle on single 6384 12S on a prone board to get going, and with dual motors I could imagine doing away with the bite, key is minimal drag when you first hit the throttle. If you treat it like a tug boat off the mark then yes the surface props will certainly not work.
In the below video from Mark, there are a few instances where it pushes through the wave, where a boogie would ramp. I think this direction of deep Vee hull is very sensible, and I think many other offshore racing features are relevant
The mould development is still ongoing, getting the plug perfect over the last few days - Battery integration, service access etc is all on the go… but yes - the plan is to release our hull and motor mounts as D.I.Y parts for etow builders around the world…
I already send parts to U.K in my other business - Its not too bad usually especially with your pound being so strong agains the AUD… !!! Its like double at the moment.
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Ok - I’ve completed the ‘Tow Bogan’ motor mounts - I’ve tested Single, InLine Twin , and side by side Twin mounts, In ABS plastic, carbon fibre, and Aluminium and come up with a really strong and successfull mount.
The Mount integrates with the Hull thats coming along in the mold process now, but would also bolt straight up to boogie boards, surfboards whatever… I set up the twin motors to run in opposing directions, so the board can be narrow , waver piercing and not become unstable or tip over with the torque when powered.
Little Video filmed by a fisherman while I was testing it today. It was only 10 Degrees in the water so I rode my parawing board so I didn’t get wet The twin motors had so much torque they would have pulled me up on a toothpick …
SO POWERED and SOOOO stable. The Whip torque was insane.
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The Mould Plug Is finally finished, ready for actuall mould build… Its taken many many layers of Bog, Filler and sanding to get perfect… The hard work how makes a perfect female mould… So Its been painstaking slow progress with out winter making drying times quite lengthy.
.
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That looks like a beauty!
Motor Mounts completed and Twin 65150 Flipski Motors INstalled…
If anyone out there can get hold of FLying Rodeo directly let me know, Im trying to get hold of them for counter clockwise rotating folding props…
Thanks in Advance.
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Hi mate ! Ive finished battery case design - got a batch coming - (1 month out) - they are 14s 7p - samsung s50 cells - -150 amp bms - anti spark switch with on off button on case…
35 amphrs…
neat as a pin - Im keeping the battery builders seperate from my business - just referring on dudes that need them to buy from them direct…
if your affer one let me know - im paying about $1000 US for 1 battery inclusive of shipping to my door…
cheers - mark
Hulls are about 3 weeks off too - very exciting. well be riding em at mambo this december
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He sold his business, not sure who took over everything.
thanks man - yes - ive found the new owners - they will be back at it putting out the worlds fastest props shortly with new energy it seems!
Hello,
Have you tried your Towbogan? I’d be very interested if you sell it.
Hi Philippe -
Yes were testing the etow /Tow Bogan litterally every day with all different motor and Tech configurations - the idea of the design was to be able to open source the Hull - becuase people will all have different budgets / power requirements for their weight and gear they foil on…
6kw right up to 20Kw Options for the Power train are already available through quite a few suppliers.
The Hulls are just entering production phase here (Litterally today) - Photos of the complete hulls probably out in a week or so.
Ive also built motor mount kits for options for people wanting to run Single motor, or Inline TWin motors, (Steering options with rudder / servo) and with R&D continuing on Water Jet and Twin Counterrotating options - were getting closer to complete turn key packages every day - there is a lot in it. It makes an efoil build look simple.
Right now though - Its Hull only for sale, Delivery in 3 weeks, with the Single and Inline Single Motor mounts coming out ready to delivery in a similar time frame.
Water Jet Motor help !
In testing for the etow, Ive been testing everything I can buy to ensure correct motor mounting positions on my etow hull…
So far, Motor mounts for Single motor mounts are a consistent position at Exactly half way up the hull - all power trains tested from 3kw right up to 7Kw working great on this hull shape - Im liking the reliability / simplicity and low price point of the 65161 65162 (6kw Max 3kw Constant) for lighter riders and or foils over 1200 Sqcm, but IMO they are lacking juice for big riders or small foils…
So…
Im keen to get on the water testing done for the 70182 motor… (9Kw Max and 4.5Kw Constant)… Should be a winner for heavier riders and small foils…
After that I want to try the Maytec Water Jet MTWJ ( 20Kw max - 10kw constant) for wake skate applications … If anyone has used these and can confirm that the motor still sucks water in and propells (wihout prop cavitation ) properly at high speeds (24 - 35 kmph) I’ll pull the trigger on one for some testing… .
Agnes hasn’t got any video of these working at speed, only water tank testing and thus I’m hesitant on the purchase till I can see one doing its thing at speed !
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