Show us your bottom

[pdecat]

With winter storage approaching this is a good time for folks to post PIX of their boat bottoms so that others can see the differences in bottom design. Later we might be able to comment on the differences as they affect performance. Shots from directly forward and aft as well as the chines.

Here is my Carver 1997 440. 22Kts WOT, 38K lbs. I fast cruise at 17 and it does very well at displacement speeds too.

 

[rnbenton]

This is the only one I have right now.

Bob

 

[caltexfla]

One of my favorite subjects on so many levels! I have a whole album I shot last winer and this summer at Jarrett Bay if you want some more. But here's mine:

George
Hatteras 56MY
Boston Whaler 130 Sport

 

[FlyWright]

1977 34 Californian Long Range Cruiser, LOA 36.8', 12.5' beam, twin 85 hp Perkins, 8 kts cruise at 4 gph, 10 kts WOT.

Here's her semi-displacement hull from the pre-purchase survey:

Here's a shot of her tail feathers during a haul out for the stbd prop repair:

 

[rduhon]

1980 Chris Craft Catalina 281
28'10" long, 10' beam, 2.5' draft
Top speed 32 mph, cruise speed 10 to 18 mph depending on conditions and distance.

 

[captddis]

These before pics are all I have handy. 1983 46C HP Hatteras T 8V92TI 650 shp 21kt 1800 and 29+kt 2350.

 

[caltexfla]

Flywright: that seems to be very flat bottomed and hard chined to be semi-displacement. How do you and others here define that?

 

[boatbum]

Best I could do at this point. Spring haul out after a Winter in the water. She's a bit cleaner now, and needs new zincs etc.. Soon enough!

1985 Hatters 43 MY. Twin 6-71TIs at about 340 HP. Buck neked she'll run 21k.

 

[370 Motoryacht]

From this spring. 1994 Carver 370 with 454 Crusaders (350hp) a piece. About 20,000 lbs all loaded up with stuff for summer and full fuel and water. Cruise at 3200 rpm is about 21/22 mph and top end right at 32/33 mph. 19 degree deadrise.

 

[FlyWright]

You've got a point there, caltexfla. It's sharper on the chine and flatter in the stern, but was still considered to be semi-displacement. Maybe semi-planing would be a better description?

In an article about the 34 Californian from Sea Magazine March 1990, they compare the boat to the 32 Grand Banks. "Although both the Grand Banks and Californian have semi-displacement hulls, Marshall gave his boat harder chines to decrease roll and flatter sections aft to give extra lift and consequently, the potential for higher speeds. The Californian's keel is shorter than the Grand Banks, but substantial enough to give the commendable tracking ability that is another of the trawler yacht's virtues."

The flat aft sections gives me great stability at anchor, which I appreciate. With my little 85 hp Perkins engines, I'll never see that extra speed. But when I re-engine...oh, never mind.

 

[pdecat]

I forgot to ask folks to include make, year, model and speed and any other performance comments as well

 

[boatbum]

Done.

 

[Woodsong]

1983 Monk 36 trawler, Hull #30, single screw 135 hp Perkins, max speed- not very fast! Fuel burn- not very much (about 2 to 2.5 GPH)!:
She's in the yard right now going through her exterior refit so this pic was from earlier this week- bottom sanded down:

And from purchase haul out:

 

[abalmuth]

1999 Cruisers 5000 sedan, 50k lbs very loaded, Cruise 22-24 Knts, Fast cruise at 26Knts WOT 30+ Knts

 

[Old_Salt]

STALWYN : Commander 30, 2001. New to me.
29’9” at waterline, 34’ overall to the HM, 11’11” beam.
Twin Volvo-Penta AD41P in line 6’s at 200 hp each.
Currently at 2815 engine hours.
31.8 knots is the fastest I’ve traveled in this boat.
157, 165, 167 nm longest 1 day trips.
342 nm on a 492.5 L fill with 745 L diesel tank at about 6 knots.

Hard Chines, Flat Bottom. Some Need a No-Noise-at-Night-Necklace for Anchoring out.

Good West Coast Boat. Easy to fly singlehanded. 15kg. (33 lb.) Bruce with 60’ of chain and 300’ of braided nylon lets you anchor out from the Peace Arch to Cape Spencer, AK.

OS

 

[RWS]

1983 Trojan International 10 Meter
33' vessel
13' beam
Shoell Designed, patented Delta Conic Hull
27.1 kts top speed with Yanmar diesels
cruise 20 - 23 kts
note the spread on the props - give unusual maueuvarability at idle speed

(everyone is tired of the Trojan ad, I'll get some better photos posted shortly)

 

[nwaring]

'87 Mainship - semi displacement. We cruise at around 14 kts
Niles

edit...forgot the word "semi" above
a better picture...

 

[pdecat]

George: What is that coupling like devicebetween your struts??

 

[vided]

when she was new

 

[Cam]

quote:

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Originally posted by pdecat

George: What is that coupling like devicebetween your struts??

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Yeah, I am curious also...