Monohull verses Multihull powersailers / motorsailers

Hummingbyrd 62 Powercat

...here was my initial reply

I thought I would present the case for smaller vessels, and shallow draft vessels.

Let me precede this opinion of mine by stating that in the past I have lived aboard a 60 foot Chris Craft power yacht and a 47 foot sailing craft for 2 & 3 years respectively. I've moved up and down the east coast, cruised the Bahamas for 8 months, sailed down to St Thomas and St Barts on several occasions, and island hopped from Florida down to Venezuela. I also spent 13 years in the boat business on the Chesapeake Bay based out of Annapolis MD.

Most recently I have been exploring the possibilities of moving back aboard a vessel of some sort (maybe even a floating house) with my new wife from Thailand, for that portion of the year we will be spending in the USA. I'm having to brainstorm, what minimum size and type of vessel might meet our liveaboard needs, yet be affordable?? I'm looking at a variety of ideas, and a variety of used boats. I have always been a BIG fan of MotorSailers, and catamaran ones in particular, and if I could afford it I would be very tempted to build one of my own designs. But in reality most of my designs are just a little too big for an owner/operater couple,.... at least bigger than necessary, thus requiring elevated operating expenses, maintenance expenses, and dockage expenses. On the other hand the catamaran hull form does offer several great attributes....shallow draft, greater accommodations within a spacial distribution for privacy in a shorter length vessel,....and level stability that women love (very important).

So what might I recommend for your needs, Mick??

1) First off I would lead you to vessel of less than 60 feet. I think you should consider a vessel size that you can fairly quickly become acquainted with handling yourself. This will inspire your self-confidence to go exploring on your own (you and your wife), without feeling the absolute need for a third party captain. You can take your friends out for an afternoon or weekend cruise without feeling the need for an operator. (I once worked for an owner who specifically ask that I take vacation off the vessel when he came to spend time on the vessel with his wife).

2) As you are brand new to boating I would NOT suggest any sail power, although you may come to appreciate it in the future once you experience it on someone else's vessel. (have a peek at these two videos I just posted recently)

3) I would NOT suggest a new-build (custom project) until you've had a chance to experience some portion of your dream afloat and can make a more informed decision as to your likes/dislikes.

4) I would suggest a nice stable vessel, with a nice house size galley, and a comfortable bathroom (head as it is known). These features are very important for the liveaboard aspect, and they are VERY important for the lady (I'm assuming you really do want to make this dream last for at least 5 years...)

5) I would suggest a vessel with shallow draft and well protected props and shaft systems. The protected props and shafts will save you a lot of heartache and money when you make those few mistakes that many new boaters (and a few older ones as well) make on occasions.

I can't emphasis SHALLOW DRAFT enough. Here I am defining shallow draft as 4 feet or less. The Chesapeake Bay (America's largest inland water bay) has a few navigable deep water channels, but the vast majority of its area is 4.5 feet of water or less on average. If you truly want to explore the Chesapeake Bay and its many tributaries (one of the truly great cruising areas), you better have a shallow draft vessel. Ditto for the Outer Banks of NC (I once did them in a 37 foot sailing cat that I could kick up its CB's and rudders to draft only 24 inches). Its nice to have a shallow draft for the Florida keys, and the 10,000 island area of SW Florida, and those inside waterway passages of the west coast of Florida. Gunkholing is so much fun, and you miss some of this fun when your vessel draws too much water....you end up passing many delightful spots for fear of running aground.

If you are intending to do the east coast, then around Florida, you might well consider doing the popular 'Great Loop', up the Mississippi, to the Great Lakes, down the Erie Canal, etc.

And don't forget the Bahamas that whole chain of islands is structured on a shallow ocean shelf that is a delight to go cruising across rather than around, especially with those crystal clear waters. Shallow draft is king!

I started out to write this posting and make a suggestion of a few possible smaller vessels that I had recently become aware of...several of them being production mono-hulls. But as I read my own words, I can't help but think of this wonderful vessel I just spent a few days aboard in Palm Beach. It was recently purchased by a good friend of mine for his own liveaboard & treasure hunting purposes, so it is not available. I'll present a few details and photos as an example of what I consider a really nice liveaboard cruising vessel that is not too audacious while accomplishing most of what you have in mind plus a few extras...great dive and explore boat.

This is a 62' powercat that was custom built by an associate in wood/epoxy/composite. I'll post some pics I took while visiting. Look at the interior room available in this vessel,....and that great galley and big saloon. One master stateroom in one hull, and two guest staterooms in the other. Then how about the great aft deck and its additional galley, outdoor grill, and dining area. This vessel drafts 3.5 feet, and is powered by two 6 cyl Cummins engines of 210HP . It will do 17 knots while using a fraction of the fuel of many yachts this size. It is highly maneuverable with those twin props widely spaced apart. Its easy to get on and off the tender from those swim platforms, and in fact could easily carry two tenders (his and hers), or other water toys. It has a generator and a watermaker, and a highly insulated refrig box and freezer that only requires running one engine once every two days. Its self-sufficient. The cost...less than $1M. I envy his choice.

See what can happen in only 60 feet!! And you and your wife could fully handle this vessel by yourselves.

Regards, Brian

 

Hummingbyrd Powercat article in Multihulls Mag

And here is an article I had saved from an old issue of Power Multihulls. (attached PDF}

I had previously underlined a number of details in this article. Here are just a few excerpts I thought I might emphasize:

Fuel Usage:
"Total fuel burned was ninety gallons, a bit over one nautical mile per gallon. With a fuel capacity of 1500 gals Hunmmingbyrd could easily transit 1,200 nautical miles at 18 knots, and double that at 12 knots"

Shallow Water Speed:
"Entering the multi-hued, shallow water on the bank, I watched our boat speed increase 2 knots as the big cat began to 'feel the bottom'. Orrin explains the phenomenon. The hydrodynamic hull form produces a wave that provides lift when the water is twelve feet deep or less, literally pushing the boat forward. He pulled the throttle back to 1800 rpms and we maintained 18 knots. His experience shows that it is actually more economical to run the shallow waters of the ICW than to go outside due to this effect"

Rough Water Operation:
"Entering Whale Cay Cut I noticed the catamaran has a slightly annoying quick motion in a beam sea. The six-foot swells were piling into the shallow water, and they began to break across the channel. Orrin pushed the throttle up until we were motoring along at 18 knots, and incredibly the ride smoothed out. Orrin assures me that 25 knots is perfectly comfortable in any seas up to about 8 feet"

...and read that conclusion in the article

 

if it lifted their hull, why did my rowing scull's stern get pulled down

when running in proportionally shallow water?

Same with kayaks and canoes, so it isn't anything to do with sliding seat or oars.

"Entering the multi-hued, shallow water on the bank, I watched our boat speed increase 2 knots as the big cat began to 'feel the bottom'. Orrin explains the phenomenon. The hydrodynamic hull form produces a wave that provides lift when the water is twelve feet deep or less, literally pushing the boat forward. He pulled the throttle back to 1800 rpms and we maintained 18 knots. His experience shows that it is actually more economical to run the shallow waters of the ICW than to go outside due to this effect"

 

SAIL mag article

Interesting article I ran across in SAIL magazine that includes both monos and multis

Cruising Criteria: How to Pick the Best Cruiser
http://www.sailmagazine.com/cruising-tips/cruising-criteria

 

Reliving old boating experiences today. I sure wish I could have afforded this 62' foot powercat when my friend was selling it. Would have made a great live-aboard, and explorer.

See the info and pictures just above.

 

I'm reading back thru this old subject thread of mine, and I thought this posting needed to be repeated,...
...particularly when i just looked thru the latest issue of BOAT International that hi-lighted 'Catamaran Spectacular',...such a group of big ugly new cats, particularly powered ones !

 

So I guess we don't have many Motor-Sailer fans in this new boating world? ,....what a delight they can be for a cruising lifestyle or live-aboard.

MotorSailing Synergy (Bob Leask said)
Motorsailing offshore is by far the most pleasant way to make passage, most of the time. With the engine barely above idle and a moderate amount of sail set, there is a synergy created by the apparent wind which generates more forward thrust than either one alone, with the bonus that you don't have to set large areas of canvas, which will have to come down in a hurry if the wind increases. The boat rides better, makes a better average speed and the batteries are always full. The benefit of using a much smaller sailplan can only be appreciated by someone who's been caught offguard in a squall with too much sail up. "Adventures" like that might be fun for weekend sailors and short coastal passagemakers, but on a long ocean passage they're something to avoid, even if it means a slower passage.

'In light airs, running one engine often is all that is needed to bring the apparent wind forward to make the sails work harder, and the combination provides much better results than either motoring or sailing alone…… sailing synergy/harmony, the motor taking over in the lulls and the rig taking over in the puffs'

 

Sail-Assisted Trawler/Power Cat, BAMBA 50'

Here is another sail-assisted power cat that looks to be a real comfortable live-aboard, go anywhere motorsailer. and it happens to sport an optional sailing rig, an AftMast one at that.

Lets see I think I've touted both of these ideas,....aft mast rigs, and motorsailing catamarans....

BambaYachts - individually built and with external project management






I think I even detect some sort of wave splitter up front?

 

#262 lays out important points. If I might add some things, given our experience with a refit 10Kw 48-5000 electric battery 12.0 Torqeedo saildrive in an early class 40 ish monohull over the past couple of years: which has led me to think an electric motor sailer should have:

- ultralight construction

-very clean aerodynamics- it doesn’t take much to slow her down when under purely electric power - maybe a wing mast that can be stowed flat easily and quickly raised? (Probably need an unstayed mast to pull that of cleanly?)

-low wetted surface and wave making drag for the regime under hull speed, and possibly a slightly lower prismatic for this lower speed work

-enough surface area for solar panels integrated into the deck and cabin to generate real power without the need for external bulky mounting structures

-terrifically close winded hull and rig (apparent wind games)

-able in very light winds- furling code/yankee zero, for example, high AR in a sloop rig, or an unstayed, easily reefed una mast rig. (See pic above & below for a general idea of a monohull approach)

-an electric outboard (outboards?) might be best- so it (they) can be pulled out of the water when only sailing, and consciously lowered into the water for regeneration or propulsion, since regen does take a knot or two off of sailing speed.

To sum up, a motor sailing electric boat is like sailing, except more so- you’ve got to play wind, current, tide, sunshine, battery charge, course & waves exquisitely, even delicately. Although possible to do this intuitively, automation might be needed to appeal to a general audience, which will make things really expensive, to say nothing of current styling trends that are high aero drag, weight, and the need for speed, which lead to big engines, big batteries, and big superstructures, as the trawler cat above.

I really do wonder if electrical power fits into a world where virtually unlimited power has pushed boat design?

 

How about this motorsailer,..the 70 foot Saphira,....
Look what this older couple have come up with ! performance, ease of handling, and safety



Here is a very interesting story of the development of this vessel
A Dream Takes Flight | Cruising World https://www.cruisingworld.com/people/a-dream-takes-flight/

And I imagine that the up-keep on this vessel could be far less than many comparable vessels,....only 2 sails, minimal rigging, two nice size engine rooms, etc, etc

I am totally impressed !!