Swabian Efoil build

sat_be · April 25, 2022, 8:02pm

Scroll up in the thread…

leachim · April 25, 2022, 8:18pm

Orientation ist like this: Swabian Efoil build - #15 by Jatem
But no Support needed if you have a good blower from 2 sides on your printer head.

Hendo_Rising · June 7, 2022, 5:14pm

Thank you for the great prop design. I will print one in Fuse1 SLS Nylon for my build.

Hendo_Rising · June 15, 2022, 4:13pm

Finished. Very nice quality. PM me and I will send you one!

ArminHarich · June 18, 2022, 10:49pm

I find by google that page and love your design of the prop a lot. I was thinking about buying a Foildrive to add it to my Levitaz HA1600Pro foil and 100L Wingboard.
But the unhydrodynamic Prop is what keeps me off.
Does your Prop fit to foildrive?
I don´t want to build everything by by self and prefer to get it at least a bit plug and play.

Thank you, Armin

leachim · June 19, 2022, 5:47am

Hi Armin,

from my point of view it should mechanicaly fit. But i am not sure if the blades are big enough for the rpm. As i understood they use the same Motor but with a much lower Voltage. The Prop blade design is kind of the most important thing when it comes to efficiancy!
There is a thread where people try to build foildrives on theyr own: Foil Drive Assist, DIY - #330 by Pod

I think they should know if it really works…

ArminHarich · June 20, 2022, 7:19am

Thank you.

Yes, the the blades design is super important!

ArminHarich · June 20, 2022, 7:33am

That is also a very hydrodynamic design, just without folding prop.

leachim · June 20, 2022, 9:02am

Jeah, there would be so much nice solutions. But my main goal is to keep it as simple and reusable as possible. With my current setup i just need to exchange the Mast and have a full Kitefoil/Wakefoil/Surffoil equipment. I already have too much equipment and it tends to get more .

pablo_foil · June 20, 2022, 9:12am

Also, in a foildrive the pod is meant to be out of the water once it’s finished its job, so having an inneficient profile is not important as long as your power is enough to start flying…

ArminHarich · June 20, 2022, 10:05am

Yes, but you can save a lot of more expensive Battery, Inverter, Heat, … if you have a more efficient prop which is more a question of clever design.

ekotary · June 27, 2022, 6:28pm

is this available to purchase? drkotary@gmail.com

Theocerbo · July 20, 2022, 8:26pm

Hey Micheal, I would like to print your prop for my lift foil but I need to modify the file to fit the lift motor. Would you share the CAD files? I used the STL to copy the hub, but the blade is a STL and I can’t complete my assembly to check tolerances and fit. If not no worries but figured I would ask! Cheers, Theo

leachim · July 21, 2022, 11:22am

Hi Theo, what file format would you need?
I would not want to upload my Solidworks project data.
But if a STEP helps i could send you one.

by the way, can you set a delayed speedup in a lift efoil?
Because if you plan to print the Blades in PETG with epoxy layer.
You destroy them yery fast if you ramp up to fast.

best regards Michael

Theocerbo · July 21, 2022, 12:33pm

Yes STEP would be great, thank you!

You can’t set the speedup rate on the Lift but I’m planning to print PETG and laminate with carbon fiber. Hopefully it will survive, we will see!

SoEFoil · July 21, 2022, 2:52pm

Hey Armin, has this contra-rotating propeller prototype ever been tested ?

ArminHarich · July 22, 2022, 9:16am

It is in use already: Candela C-8 first flight: Testing the most premium flying electric boat in the world | Electrek

pablo_foil · July 22, 2022, 10:12am

Its good that they provide the efficiency numbers.
Lets compare it against values reported here for efoils:
Candela c8: 650 wh/km @1700 kg
Efoil : 50 wh/km @ 100 kg

So, per kg:
Candela: 0.38 wh/(kg.km)
Efoil: 0.5 wh/(kg.km)

I expected a larger difference. Especially since larger vessels should be more efficient

SoEFoil · July 26, 2022, 5:07pm

I wanted to now what it costs to print the two blades only with “Strength AND/OR impact resistant” properties on a professional site with high-end materials.
https://craftcloud3d.com/ which also offers a nice viewer btw.
PEEK is a lightweight, industrial-grade thermoplastic polymer with high-temperature and pressure resistance.
Carbon-reinforced PEEK is stronger and stiffer than normal PEEK.

PEEK and Carbon fibre PEEK are only available in ASIA (Mantafoil propeller secret material ?)

The interesting part when printing Aluminium, 316L Steel or 17-4 PH Stainless Steel:

printing costs in Asia are 2 to 4 times cheaper than printing in Europe. what we could imagine. However…
shipping costs Asia to Europe are twice as less than printing in Europe and delivering in Europe … just unbelievable !

Prices are in EU/USD. The total cost below is for two blades only, no hub. Ordering the hub in addition would be without extra shipping cost.

2 blades only	Print. cost	Shipping	Total cost	Ships from To EU
ABS	6,59	8,33	14,92
HIPS	6,97	11,9	18,87
ASA	7,66	11,9	19,56
PETG	7,66	11,9	19,56	EU
polycarbonate	12,69	8,33	21,02
Carbon fibre ABS	12,82	8,33	21,15	EU
Carbon fibre PETG	12,82	8,33	21,15	EU
FDM Polypropylene	7,15	22,48	29,63
FDM Nylon	7,56	22,48	30,04
Carbon Fiber FDM Nylon	8,34	22,48	30,82
MJF Nylon PA12	13,3	24,48	37,78
Glass-Filled Nylon	13,48	24,48	37,96
Markforged® Onyx	19,67	41,65	61,32
Carbon Fiber Polycarbonate	29,14	33,81	62,95	ASIA
Aluminium	44,36	24,48	68,84	ASIA
316L Steel	73,04	24,48	97,52	ASIA
17-4 PH Stainless Steel	111,88	24,48	136,36	ASIA
Aluminium	166,85	42,09	208,94	EUR
316L Steel	220,77	42,09	262,86	EUR
17-4 PH Stainless Steel	220,77	42,09	262,86	EUR

PEEK	68,39	24,48	92,87	ASIA
Carbon Fiber PEEK	68,39	24,48	92,87	ASIA

WIKI: PEEK can be processed by conventional methods such as injection molding, extrusion, compression molding etc. Thanks to these properties, PEEK and its composites are widely used in aerospace, automotive, structural, high temperature electrical and biomedical applications .

Last question: direct or via a hub ?
For a 316L print, direct via Sculpteo is -14%, in a EU to EU case.
The Asian manufacturing price remains unbeatable.

2 blades only	Print. cost	Shipping	Total cost	Ships from To EU	Site
316L Steel	73,04	24,48	97,52	ASIA	Craftcloud
316L Steel	220,77	42,09	262,86	EUR	Craftcloud
316L Steel	213	11,66	226,99	EUR	Sculpteo -14 %

manif · September 19, 2022, 4:36pm

@leachim hi Michael, I really appreciate the time and effort you’ve put into your folding propeller. I am looking into the possibility of producing a community designed and built metal prop for less than 200€ and think your design would be a great candidate. Would you mind us casting and testing your design?
You can check out the link below.

Best mani