Nice catch ! Could be the motor manufacturer of the Whimsifoil Plume efoil using a “Patented” waterproof outrunner motor.
They charge an extra 40usd for the waterproofing as per Shenzhen Saite Motor Co., Ltd.
The 63100 is 4500W so 50% more powerful than the 6374 and should cost 140usd waterproofed.
Why do they shorten the shaft only when they waterproof an outrunner motor ?
I got another flipsky motor that was seized with salt water that I refurbed, so I’m not going to order one any time soon. Interested if someone else does though!