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Search took 0.00 seconds. Search: Posts Made By: MarkSF
Forum: General Sailing Forum 18-03-2017, 10:11
Replies: 65
Views: 10,214
Posted By MarkSF
Re: How Fast Does Your Boat Motor?

The first thing to do is to determine if you have a problem. Which means measuring your speed THROUGH THE WATER. To do this you need to subtract the effect of current.

Some ways to do this without...
Forum: General Sailing Forum 18-03-2017, 10:04
Replies: 65
Views: 10,214
Posted By MarkSF
Re: How Fast Does Your Boat Motor?

"Sometimes faster, sometimes slower depending on tide"

Just to be clear, the tide does not change your speed through the water at all. It does change your speed relative to the ground.
Forum: General Sailing Forum 17-03-2017, 22:11
Replies: 65
Views: 10,214
Posted By MarkSF
Re: How Fast Does Your Boat Motor?

For the prop to turn in neutral, the boat has to be moving relative to the water - i.e., being driven by the sails. This would be normal.

When you were going downwind, were the sails up?

What...
Forum: General Sailing Forum 17-03-2017, 21:19
Replies: 65
Views: 10,214
Posted By MarkSF
Re: How Fast Does Your Boat Motor?

Why would the current make the prop turn? The boat moves with the current.

Also, Without knowledge of the current at the time, no conclusion can be drawn about your speed through the water.
Forum: General Sailing Forum 17-03-2017, 21:03
Replies: 65
Views: 10,214
Posted By MarkSF
Re: How Fast Does Your Boat Motor?

"We determined that the prop was turning because of the current as we down wave since the wind was behind us. Is that normal?"

This sentence makes no sense.
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