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Old 08-08-2016, 08:41 PM   #21
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Re # 20 above it looks like the list resulting from grounding would not push the props hard against the bottom as the hull is deep and the props are quite close together.

Mark,
I actually thought somebody thought it was an addition that made the keel look better and was trying to draw you out.
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Old 08-08-2016, 09:54 PM   #22
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Great Harbour all have twin engines with skegs that the running gear runs through. There is a sand shoe at the bottom. I know of one Great Harbour that was set on the bottom by a falling tide with no problems to the running gear.
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Old 08-08-2016, 10:13 PM   #23
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Our 88 Defever has twin rudder posts and a center keel a bit lower than the props.

twin Cummins
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Old 08-09-2016, 01:32 AM   #24
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To confirm what was mentioned about-the Krogens, like the Nords, have a centerline keel that tapers off at abut 3/4 of the length, with twin keels w/skegs. As Nomad(IIRC)noted, there are water flow issues with twin keels. On the Krogen, the keels are designed to direct and enhance the waterflow through the props. The 58 can sit on its own bottom. Pretty sure that is true for all the KK twins.
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Old 08-17-2016, 02:10 PM   #25
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Skegs and/or keel on twins

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Mirage Great Harbour N-37 bottom with keels. These are all (Ns, and GHs 37-47' x16') designed like this. Lou Codega a WEBB Institute graduate MIT Naval Engineering masters degree holder is the Naval Architect/ Naval Engineer PE who designed these purpose built boats. He posted once to answer many "mistaken" opinions regarding hull performance vice design. He is presenting in Newport at Trawlerfest this Sept. on hull design performance applications. It will be a fascinating seminar to attend.
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Old 08-17-2016, 02:32 PM   #26
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Nice tip on Codega's presentation at Newport, Joe. Sure would love to be there.
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Old 08-18-2016, 02:30 PM   #27
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My Mainship 34 with twin Yanmars has dual skegs.
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