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Search took 0.00 seconds. Search: Posts Made By: NPCampbell
Forum: Propellers & Drive Systems 21-08-2022, 11:48
Replies: 59
Views: 7,507
Posted By NPCampbell
Re: Prop for Electric Motor

Of course they work at high speeds, but at an efficiency loss. If ducts were efficient at high speeds then every prop plane would use a duct.

Drag generally increases with the square of velocity...
Forum: Propellers & Drive Systems 20-08-2022, 21:46
Replies: 59
Views: 7,507
Posted By NPCampbell
Re: Prop for Electric Motor

There's a few technologies that I have seen that aren't widely used on recreational boats to increase efficiency.

I saw a video demo of a different prop design called a Sharrow prop that claims...
Forum: Propellers & Drive Systems 20-08-2022, 21:18
Replies: 59
Views: 7,507
Posted By NPCampbell
Re: Prop for Electric Motor

Or if you don't expect to sail. Ducts provide a net increase in efficiency when powering at slow speeds but they are an efficiency loss when sailing due to drag.
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