The Lift E1 eFoil thread - info for the DIYer


#1

Shipments have officially started as per this YT video posted on 2018 June 14th.
https://www.youtube.com/watch?v=jFoJFd9mJhE

The Lift Foils YouTube channel is also now offering a complete How-To eFoils series (Maintenance, assembly, safety, practice… ). They took their time but here they are !

You can post here your info about Lift technical choices: motors, ESC, cooling, connectors, wireless…


#2

That is a very nice build.


#3

Totally high end product. There’s a lot of thought and work in their board. Wish the pricing was more reasonable, but you usually get what you pay for. Hopefully they sell a ton of them


#4

Been surprised by the size of the battery charger seen in Initial Setup - Video #1
A really High-End recent (2017) one from the Canada-based Delta-Q, worth 500+ USD.

This charger contains Pre-loaded lithium charge profiles supporting various lithium-ion (Li-ion), lithium polymer (Li-Poly), or lithium iron phosphate (LiFePO4) cell and pack capacities.

Delta-Q IC1200 Charger 1200W with 48V 25A output.
IC1200-Feature-Image

It is possible to find cheaper 48V chargers such as the ones used in 48v Golf Carts but the recharge time is 4 to 6 hours instead of 2 hours (15 amps instead of 25).
48V 15 AMP Club Car Golf Cart Battery Charger for 190USD

I couln’t help looking at the battery life aspects. Lift have probably chosen Lithium-ion (Li-ion) cells because they have a better energy capacity, are cheaper and safer (explosion risk) than Li-Pos. However, both have a Recharge Life of 300 – 400 cycles, say 350. This means the battery pack should be renewed every 3 months in a school or rental place if recharged 4 times a day ! That’s a serious operational cost to take into account in a feasibility study ! From 8 or 9 am to 6 or 7 pm, only 8 persons riding 30 minutes each can use the board every day. That’s not many to make profits.


#5

These videos are great insight into the Lift design.

Does anyone know the motor connectors they are using?


#6

The idea I had in mind when creating the thread … a place where users could post their retro engineering info even if I am aware that users who can spend 12.000 USD in such an equipment are not legion on this forum … Hopefully, as soon as the Lift eFoil appears in various places across the globe, comments and picts with valuable info for home builders should pop up …ESC, motor, cooling, remote control, …


Efoil for rent in Switzerland
#7

A call for pictures if you see one of them… plus two noticeable news from LiftFoils Instagram account:

  • first eFoil with folding propeller used when going down waves (September 10 2018)
  • [liftfoils]watch the hand controller pass from hand to hand. That is the first shot with a folding propeller. No power.

eFoil DC motor used as a generator to charge battery
#9

There’s no retractable prop. They just using the normal efoil in the surf.


#10

Edited, they are folding and not retractable propellers.
When the engine is switched on, folding blades are spun outwards by centrifugal force.
When the engine is cut off, the pressure of waterflow forces the blades back in place streamline. Since the roots of the blades are linked with geared teeth, they open and close together with the same angle.

I’m not sure about that. Lift are so comfortably ahead of the competition that they can take time to test this kind of fancy prop not so difficult to 3D print or mill by the way.
Hub%26blade_folding%20prop

They have probably been inspired by tests like this one from 2009:

On boats, folding props have proven their efficiency. Prop open, you can get better forward speed and pull compared to a fixed-blade one. Then, when folded, the drag is so marginal that it is difficult to measure. This feature seems to be praised by Lift when going down waves.
No%20drag

Unlike our eFoils with fixed blade props and nozzle. When the motor is cut-off the drag is present and can be measured by a luggage scale towed by a boat.

The winner of the above tests: https://flexofold.com from Denmark
flexofold_shaft_3bl_01
flexofold_shaft_3bl_02