reverse chine?

[Jklingel]

Question: What, exactly, is reverse chine? What is straight (I guess) chine? Why would one want one or the other? Thanks. john

[Searider]

Reverse chine - easy to draw but a bit more difficult to describe.

The chine is where the bottom of the boat joins the side.
Most chines incorporate a spray rail - a horizontal section up to a few inches wide. These deflect spray and increase lift.

A reverse chine is where this spray rail is angled down and much wider than normal. The idea is that it should should trap water and air under the hull for lower drag.

The front end of a Boston Whaler is an extreme example of this feature.

I hope this helps.

Duncan

[Matt]

Does it work?

[Islander]

Have a look at Ballistic 7.8 metre hull. This has reverse scallop chines. Quite a hard ride in a chop but amazing sea keeping qualities. This boat has nerver heard of "Chine Riding"
www.ballisticmarine.com

[Andy T]

Originally Posted by Searider

Reverse chine - easy to draw but a bit more difficult to describe.

The chine is where the bottom of the boat joins the side.
Most chines incorporate a spray rail - a horizontal section up to a few inches wide. These deflect spray and increase lift.

A reverse chine is where this spray rail is angled down and much wider than normal. The idea is that it should should trap water and air under the hull for lower drag.

The front end of a Boston Whaler is an extreme example of this feature.

I hope this helps.

Duncan

Good explanation Searider, got me thinking to how I couldnt quite explain it properly with out a diagram.

I did find one diagram though - check out this page near the bottom http://www.lowe.com/suncruiser/const...deck-boat.html

all the best
Andy
andy@rib-hire.com
www.spareribs.info