Search found 9 matches

by tai626
Jan 05 2021 12:18am
Forum: Electric Watercraft
Topic: Bayliner Conversion
Replies: 34
Views: 1273

Re: Bayliner Conversion

Happy New Year!

I am following your conversion closely.

Tai
by tai626
Oct 28 2020 9:12pm
Forum: Electric Watercraft
Topic: Bayliner Conversion
Replies: 34
Views: 1273

Re: Bayliner Conversion

I think It is easier for you to transitioning from the electric bike to boat. I come from model airplane so it will take me a while to get things figured out in real world. The thing that worry me the most is the system reliability. I am having redundancy in almost every components. I will be starti...
by tai626
Oct 28 2020 1:01pm
Forum: Electric Watercraft
Topic: Bayliner Conversion
Replies: 34
Views: 1273

Re: Bayliner Conversion

Check the rpm that your propeller need and find the motor with the KV that match the voltage of your batteries (48V, usually) The beauty of hub motor is the high torque low kv otherwise you will need the reduction gear. The relationship of power vs torque vs rpm http://www.epi-eng.com/piston_engine_...
by tai626
Oct 28 2020 11:11am
Forum: Electric Watercraft
Topic: Bayliner Conversion
Replies: 34
Views: 1273

Re: Bayliner Conversion

The reason you are getting 3x my number is because You are using Diesel engine concept to estimate the electric motor...

Here is the Uma sailboat:

“So a 1hp electric motor, drawing 750W, can push about 1500 pounds of displacement.“

Very good reading.

https://www.sailinguma.com/the-motor

Tai
by tai626
Oct 28 2020 12:51am
Forum: Electric Watercraft
Topic: Bayliner Conversion
Replies: 34
Views: 1273

Re: Bayliner Conversion

A 23HP diesel engine has ~50nm of max torque.
23nm for a 10kW motor is not bad. All depend on the reduction and propeller, I think.

Tai
by tai626
Oct 27 2020 7:22pm
Forum: Electric Watercraft
Topic: Bayliner Conversion
Replies: 34
Views: 1273

Re: Bayliner Conversion

Boat doesn’t need gear, I would say.
The water resistance is the best torque conversion. You do need the minimum rpm to match the propeller.

The trolling speed is done by speed controller, no extra torque needed at low speed.

Tai
by tai626
Oct 27 2020 9:01am
Forum: Electric Watercraft
Topic: Bayliner Conversion
Replies: 34
Views: 1273

Re: Bayliner Conversion

I saw the video of electric bike you posted but I don’t think the boat propeller will unload that much as the boat speed up from 3 to 6 knots...

Tai
by tai626
Oct 26 2020 12:14pm
Forum: Electric Watercraft
Topic: Bayliner Conversion
Replies: 34
Views: 1273

Re: Bayliner Conversion

I am in the process to convert a sailboat with similar size of yours: 26’ with 8’ beam. Here is some random thoughts as suggestion: I couldn’t find the displacement of your boat, let use mine instead: 4600lbs. The hull speed is around: 7knots. The rule of thumb for the electric power needed is 1500l...
by tai626
Sep 25 2020 9:30pm
Forum: Electric Watercraft
Topic: Shamrock, 25 foot sailboat electric conversion with an ebike hub motor
Replies: 40
Views: 3531

Re: Shamrock, 25 foot sailboat electric conversion with an ebike hub motor

Thank you for sharing! I read this forum mostly for the RC airplane electric conversion and I have been trying to convert a 26' sailboat. I have since learnt quickly that the RC grade components are NOT suitable in the sailboat... Now I am buying Electric cart components used from eb@ay to learn the...