So... Chine runners?

Hi,

While researching building methods I came across Matt Layden's Sharpie designs with chime runners. Has anyone tried these with a boat bigger than a micro sharpie?

 

Do you mean Chime or chine ?

 

I'm sure he means "chine". Context.

I can't think of anyone who has used his embodiment of lifting strakes in a larger craft, but others might know of some?

 

Saw some photos but a drawing of the hull cross section with the 'runner's might help clarify things. Not sure if they help performance but might:
(a) dampen or steady boat roll and heave. Seen similar fittings on commercial boats (30'-80') and they call them 'rolling chocks'. Larger than bilge keels but more effective at slow speeds or stationary
(b) steady boat on the beach when boarding.
on the 'down' side --> will increase wetted surface area & resistance

 

Sorry, keyboard got the better of me. Yes I meant chine. They seem like horizontal bilge keels.

<thread title updated>

 

Thanks - I try not to assume... we are talking boats after all!
The rolling chocks I mentioned are larger and protrude further from hull. More important, they angle down about 20 -30 deg.

 

I am guilty of being a google expert on this one. I hate to coin in, but admitting zero knowledge as a caveat.

I was curious is all.

But you can read and find that draft is an essential component and must be 1/5th of beam. So where these fall apart is ANY other ratio. And that makes at least gutcheck sense. At some point; they would seem to do less than a deeper draft alone.

A great article.

Jim Michalak's Boat Designs/The Index http://www.jimsboats.com/1nov14.htm#Chine%20Runners

 

They are not. Besides Fallguy's link, do a search at the bottom of this page and then web search on Matt Layden, Sharpie, and Enigma. They have been discussed many a times.

 

And, by the way, this is not dissimilar to a keel or skeg on a canoe. It helps them avoid sideways slip in a beam wind. If they have enough draft for their beam, unneeded.....etc.

 

But that's 1/5th when heeled, 1/10th when unheeled or level.
According to the diagrams in the article anyway.
It's not exactly clear to me...

 

I am really not qualified for any debate.

But, in general, it appears as the draft of the vessel deepens; the draft does more to reduce slip than any chine runner can.

 

I'm surprised that even when designers "go rogue" and break traditional design rules, they seem to stop short of "trying everything". For example, I've not seen the chine runner extension fixed to the bottom instead of the sides of the chine. I've thought of bolting an inverted railroad track under each chine on a flat bottomed cruiser instead of an iron keel. For cruising I'd think one needs a stiff boat, not a tender one. Combined with a scow hull, possibly?