Tom,
I own an F-27 in Marina del Rey and I am also converting my 30' ketch to electric. I am pretty familiar with the F-22 design, though I have yet to see one in real life. From my experience with trimarans like the L-7 and Multi 23, I would agree that a 4-5hp outboard is the minimum appropriate on an F-22 for the coastal and offshore conditions that we see in SoCal. The F-27 needs at least an 8hp motor for offshore work.
I also agree that the Torqeedo 2.0 is the right size for you, I own a Travel 801 for my inflatable dinghy, it would not be powerful enough for your boat.
The two two big objectives that I read in your post are for light weight and potential range to get back from Catalina. This is going to be very difficult to achieve simultaneously with electric, especially when your alternative is a gas outboard.
First let's figure the gas drive system. A 5hp 4-stroke (mandatory in California) weighs about 55-60 pounds and should easily drive the boat at 6 kts. Motoring from Catalina will take over 4 hours and use about 3 gallons of gas, you can double that for a safety factor. 6 gallons of gas weighs about 50 pounds with tank and fuel lines. This gives a target weight of less than 110 pounds with over 50 miles of range. Total cost is about $1500.
For electric, the Cruise 2.0L weighs 40 pounds and costs $2800. I would guess that 1200 watts should drive your boat to almost 5 kts, the motor might not be able to provide 6 kts at 2000 watts. If we use my guesstimate of 1200 watts (or 50A at 24V) at 5 kts, a one way trip to or from Catalina is 5 hours or at least 6kWh. Group 31 AGM batteries are rated to about 100Ah with a combined 24V weight of 150 pounds and a cost around $500. Because of the high amperage load, their capacity to 80 depth of discharge is around 1 hr 15 min or 6.3 miles. So getting a 25 mile range would require over 500 pounds of AGM batteries. You could go high tech and buy the same 8kWh Lithium battery pack that I bought for my ketch. At a cost of about $3500 and weighing 200 pounds, these batteries would give you a 26 mile range at 5 kts.
So with an electric Cruise 2.0, you can choose between: 200 pounds and just over 6 mile range for $3300, 570 pounds and 25 miles range for $4800, or 240 pounds and 26 mile range for $6300.
I'm a huge fan of electric but for a non-ballasted high performance sailboat, a gas outboard is lighter, cheaper, simpler, more powerful, readily available and has greater range. The electric is quieter and cleaner. You get to pick your own priorities.
Fair winds,
Eric
1990 F-27F #167 Witchcraft
1964 Cheoy Lee Bermuda 30, Serenity
Marina del Rey, CA
--- In electricboats@
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> Hello. I am new to the group. I am building a Farrier-designed F22 in Southern California, and am intrigued with the idea of powering with a Torqeedo Cruise or something similar.
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> I would appreciate seeing system diagrams of existing set ups, and perhaps there have been some earlier posts that contain such?
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> I hope mostly to be sailing, and electric power would be limited to getting away from the launch ramp, anchoring, and perhaps getting home from Catalina on the odd day when there is no wind. The F22 suggests 5-8 hp horsepower for aux power. Minimizing weight on the stern (and weight in general) is desired. Steering would be by rudder, not by rotating the motor. Remote throttle control is desired.
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> So, is a Cruise 2.0 Sufficient, or is a 4.0 to be recommended? If I understand the literature, I would need two group 31 12v deep cycle batteries (is that about right for the 2.0?). What battery type? Gel, AGM, Lithium, regular lead acid? What is recommended for recharging? A Honda -2000 generator? Solar cells? No shore power requirement is envisioned. The boat will be stored on a trailer at my home, and launched at a boat ramp for sailing.
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> Expect mostly sailing day sailing or short duration cruises (2-4 days) with the wife and two kids.
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> Budget OK, but not unlimited, and I am looking to maximize value over the life of boat.
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> I will need to create the full electrical system for the boat, including navigation lights, instruments, bilge pump, cabin lighting, and power for ipods etc. Plan to cook with propane or some other fuel.
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> Thank you in advance for any links to previous posts or sites that can help educate me on the above.
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> Tom Chrien
> Rancho Palos Verdes, CA
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