With good bumps and a paddle, I think it could work, even if a flat water start proves to be impossible.
What is the KV? torque = phase amps x KT where KT= 1/KV (needs kv in rad/sec)
On 12 S you need the lowest KV you can get, or a smaller prop than what we are used to run on bigger motors, as you may not be able to generate enough torque without stupid high phase amps, or reach magnetic saturation before that.
My effective range = number of starts with the maytech VS the ali 6384 is about 30% less. so what you loose in motor weight you kind of have to increase in battery weigh or sacrifice the range.
IMO it is due to three things, first the motor needs higher phase amps because the KV is 150 VS 120 for the ali, then second is because it is making less torque, each start takes longer and uses more energy as it does not have the torque to lift the board up before the foil fully engages.
Third; the smaller motor does not allow me to fully discharge the battery, because of the higher amp draw causing LVC power reduction much earlier.
This one is 120kv. On AliExpress there is a variety from 120kv all the way up to 250kv. I’ll have my paddle (which will be doing a lot of the work) and I use the axis 1300 png foil which is about as big as they get. It cost £30. It’s worth a try at least.
Efficiency wise i agree but if you’re looking for the absolute lightest setup to get up on then might be possible with the smaller motor, my thinking is that he lower kV might not make sense since motor won’t be able to make the same max torque, then to increase power you could aim for rpm instead. Go to higher voltage maybe?
The lvc is a bummer but for the motor weight difference you could add 6pcs 21700 batteries.
It’s funny, I’m stuck on the best way to transition from the three phase wires coming out of the motor to the one wire going to the wire gland into the electronic box.
I’d love to the keep things clean and not have three wires dragging around along the way. I’ve seen a few solutions here such as: wrapping the three in mesh, replacing the three close the motor with a single 3-conductor cable, to just leaving things loose.
Either way, there’s a need for a waterproof splice. Either a removeable one, or a sealed permanent one. In the case or permanent splices: what are people doing for reliably sealing phase wire splices under water?
Just curious if anyone had some thoughts as to what things failed or worked best for them. Right now, everything is working and I’ve got 3 phase wires wrapped in mesh going into a waterproof connector above water that then transitions into a single wire entering the wire gland. Or should I cut the phase wires short near the motor, splice and seal them from water and have a nice clean single cable run to the box?
I get an hour on a pack. I don’t ride constantly though. If there is a lull in sets I’ll come off the foil and sit around for a while and I’ll take a few breaks in between a good run of waves to chat to friends etc. I tend to ride big foils too which helps run time.
I have never found the point when I cannot get up and going but always swap packs at 38 volts as a minimum just to keep some longevity in the packs.
It baffles me a bit that guys spend ±5k on the foildrive and the ride it on std boards. You’d think they’d get custom boards so that there is no unit sticking out the bottom.
I agree. Even the custom boards that some companies are now making have a long groove running on the underside which often have a non flush lip at the front. It looks clumsy. The weight saved on a board with a foil drive inside is a big enough benefit for me alone. Then there is the dynamics. It’s a no brainer.
Today I tested a 6362 105kv motor. I used a two blade and three blade foil drive propeller. My goal was to shave some weight off of my setup by switching from an aluminum mast to a carbon mast. This motor is about 400 grams lighter and the mast is about 1.2 kg lighter. I was worried about the power to get up on the board with this smaller motor but it had zero issues on 12s and was more efficient then my 6384 baud motor and my 6374 Flipsky motor.
Max power used to get up on the Axis 1201 wing was 742 watts with the two blade propeller and 1367 watts with the three blade propeller. For reference I weigh 78kg. The total board weight with a 12s2p battery (p45 cells) ready to ride is 10.8kg.
Hey Tim, thanks for providing such concise info. Can you please share more details on the motor, link to AliExpress or brand. I’m 65kg, I’m sure it would be enough for me!
Nice, there is a good appeal for this kind of setup : you can easily take it on the plane with 100wh battery modules. How much does the board weight?
10.8 kg is not the lightest, based on the small motor
