Peters Concept (Bavarian style)


#42

Hi, I used three in a row with 36Volts. The amp was below 1A. For me it was great, but my ESC current was always below 60A.


#43

Hi, Peter! I’d like to know what engine and what transmission you used and how do they feel?
In any case, thank you for sharing your project!


#44

Hey @Peter how did you make your foil? I’m not happy with the one I have and would love to give yours a try if your willing to share the CAD files.


#45

Hey I’ve milled a mold for it and then laminated it with glass fibre. I can provide the CAD, but I’m not very happy with it, because having a curved Wing will improve stability. Did you have a look to the new wings from slingshot? http://blog.slingshotsports.com/2017/07/24/slingshot-wind-foil-line/ Maybe it’s worth investing…


#46

Curved in what direction? Towards the back, or arched like a bridge?


#47

Like a bridge. Anhedral downturn shaped wings add to the vertical wing area and improve yaw stability at the expense of lift. Stability vs efficiency.


#48

So @peter, what about that list from Nov 17 ? :wink:

Man I love those numbers you told us : 50 mn of flight, that is amazing…


#49

What is the motor brand?


#50

waking up a month later…
But it makes it less stable on the roll axis.

Having it curved the other way: with the wing ends “higher” than the center would greatly improve roll stability… like self-righting foil…

Historically, kitesurf wing had the wing curved down to let you angle the foil much more to go upwind before the wing tips breach the surface. Breaching the surface used to mean assured wipe out. With all the recent development around surf foil, i’m seeing more and more flat wings, and advertisements (and videos) say they can breach the surface without wiping out.

For our use, we almost don’t angle the mast sideways, and as the motor has to stay in the water, we have no chance of breaching and room to install upward curved front wing…

I’m itching to test such a wing even before making a cleaner board :thinking:

anybody tried that? or am i overlooking something?


#51

I have experienced several breach of surface in tight turn at high speed and every time it’s like an uncontrolled skid and I end up in the water.

com-optimize


#52

I’ll tell you how these work as I have 2 of the surf variety coming from China :slight_smile:


#53

No…I must disagree with this.

Having the wing ends higher than the central point would decrease stability as it introduces the roll factor.

If you look at the best surf wings, the tips of the main wing all point down as well as the stabiliser having an anhedral. The cheaper wings seem to be flatter as this makes the manufacturing process a LOT easier and cheaper.

As our setups improve and become lighter, you’ll find that guys will start to carve and that’s when the surf style wings will come in handy.


#54

Hey @philgib, sorry forgot to add;
Here are two drive concepts that will definitely work:

  • Loads of power for heavy and really fast riders: TpPower 5690 motor with 290KV, a 3/1 ratio gearbox from Neugart and a torqeedo p350 Ultralight propeller, both @10 and 12S (12S is close to harakiri at full throttle)
  • Middle power with very thin motor pod: SSS 4092 with 600KV and a 6/1 ratio gearbox either by Reisenauer or Neugart and a 7 1/4 by 7 inch prop @10S

Both can easily be housed in an aluminium tube; off side thrust bearing is highly recommended, and double shaft sealings with oil in between!

As I said you can only reach that low power consumption when you want to fly with nearly zero stability. Maximum efficiency leads to zero stability. You have to find your own sweet spot for this.


#55

Awesome build Peter.
Are you still using the batteries from RC Technik.
I am also planning my efoil since I read your thread :slight_smile:
Did a lot with 18650 batteries the last years. Will probably build a 12s pack out of the LG cells with cell level fuses.
When I read the consumption specs above, 2 h of flying should be possible with around 6 kg in batteries :slight_smile:
Is there any way to contact you? Didn’t find a function here in the forum.


#56

you have to be registered for more than 24h (anti spam).