Search found 9 matches

by Alex M
Jan 02, 2018 3:49 pm
Forum: Electric Watercraft
Topic: Geared motor vs brushed
Replies: 7
Views: 484

Re: Geared motor vs brushed

Chvidgov - yes, driving displacement hull faster than a hull speed - would be very inefficient. Resistance forces increase many times. That's why one of conditions that I set was "slower than a hull speed".
by Alex M
Jan 02, 2018 3:03 pm
Forum: Electric Watercraft
Topic: Geared motor vs brushed
Replies: 7
Views: 484

Re: Geared motor vs brushed

Either model needs an adequate battery 900-1000 WH. If you add 900 WH Li battery to Minn, quality PWM remote, waterproof battery box (they don't exist, need to make something), then Minn becomes $1,300 and Torqee $2,400 (comes with a small battery of limited usefulness, you have to buy 900 WH anyway...
by Alex M
Jan 01, 2018 10:15 pm
Forum: Electric Watercraft
Topic: Geared motor vs brushed
Replies: 7
Views: 484

Re: Geared motor vs brushed

I should've mentioned that Torqeedo is brushless geared - not just a geared. Makes a typical whirring noise of a geared motor. Minn Kota is brushed and (I think) direct drive. There is zero info on the latter feature at the Minn Kota website, but it "sounds" literally like a direct drive. Inside the...
by Alex M
Jan 01, 2018 7:05 pm
Forum: Electric Watercraft
Topic: Geared motor vs brushed
Replies: 7
Views: 484

Geared motor vs brushed

Forgive my ignorance - and mistrust ;)... Without going into fundamentals of mechanics and hydrodynamics, would like to hear semi-educated opinion. Here are 2 trolling/kayaking motors: 400W Torqeedo Ultralight 403, geared. (I understand they use PWM controller for variable speed). 360W Minn Kota End...
by Alex M
Dec 17, 2017 2:18 pm
Forum: Electric Watercraft
Topic: 36V battery for 29.6V outboard?
Replies: 8
Views: 557

Re: 36V battery for 29.6V outboard?

I am aware of problems with speed on water. Resistance to boat movement increases 8 times when you increase speed 2 times, so every additional 0.5 km/hour results in huge drop of range. Besides, Torqueedo 400W motor has peak efficiency - don't remember - at 200W or less. Its max speed is 8-9km with ...
by Alex M
Dec 16, 2017 9:07 pm
Forum: Electric Watercraft
Topic: 36V battery for 29.6V outboard?
Replies: 8
Views: 557

Re: 36V battery for 29.6V outboard?

Thanks, Justin. 95% DC-DC is impressive, didn't know this was possible, most converters are under 75% efficiency. Yes, 200W output is below 400W of that Torqy 403. One more connector is also a minus, on water. I understand what Germans were thinking with Torqy 403 - more volts, less amps - but why n...
by Alex M
Dec 15, 2017 2:25 pm
Forum: Electric Watercraft
Topic: 36V battery for 29.6V outboard?
Replies: 8
Views: 557

Re: 36V battery for 29.6V outboard?

Didn't know about this Haswing. Thanks. 2,000 Euro, but it is 24V! One thing makes it unsuitable for me - "fresh water only". 18 lbs weight is reasonable, but on a kayak this outboard means - side mount, and then it's a bit heavy on the side, though not as heavy as my current 30 lbs gas motor. OTH, ...
by Alex M
Dec 08, 2017 11:31 pm
Forum: Electric Watercraft
Topic: 36V battery for 29.6V outboard?
Replies: 8
Views: 557

Re: 36V battery for 29.6V outboard?

I see on this graph that 33.6V means that 2000 mah was drawn out of 3000 mah cell? So I will only have 1/3 of 700 WH to play with.
Not worth the trouble.

And then, I will kill it if I run it down to 2.8V. Below 3.2V it can't support the load anymore, the graph just drops down.
by Alex M
Dec 08, 2017 3:43 pm
Forum: Electric Watercraft
Topic: 36V battery for 29.6V outboard?
Replies: 8
Views: 557

36V battery for 29.6V outboard?

Good day, people. I hope this is the right place to ask. Considering electric outboard on a kayak - I'm tired of my 2.5 HP four-stroke Suzuki. Nice motor, runs forever on 1 liter of gas at 6 mph speed, but... 2.5 HP is more than I need, plenty of noise (quieter than 2-strokes, but I'm sitting next t...