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Old 12-12-2009, 17:08   #511
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Nordic cat,

Do you have photos of the A frame mast. what is your opinion of the A frame mast without highjacking the post. The combination of drives and mast is certainly pushing out there.
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Old 19-12-2009, 00:48   #512
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Quote:
Originally Posted by KGP View Post
Gideon, correct me if I am wrong - this boat is to be yours, correct?

So are the retractable drives already installed on this beast? Haven't seen a photo showing them...
Here are a few pictures of the electric drive system
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Old 19-12-2009, 13:54   #513
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Quote:
Originally Posted by downunder View Post
Nordic cat,

Do you have photos of the A frame mast. what is your opinion of the A frame mast without highjacking the post. The combination of drives and mast is certainly pushing out there.
Here is some info on the subject. I wanted to add an arch mast to my sports fisher back in the late 70"s..........._/)

http://www.unols.org/publications/ma...um/12SmCat.pdf

Boat Design

media
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Old 19-12-2009, 21:13   #514
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Thanks Delmarry. Useful info.

Gideon,

Have you considered fitting an A frame rig to your Fastcat range?
Could it be done a reasonable cost?
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Old 20-12-2009, 07:20   #515
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A-frame mast system seems to be intriguing - two smaller masts joined together at the top and mounted on the deck edges at the bottom. But structurally, I wonder if the A-frame rig is up to ocean sailing. With a standard single mast you have spreaders and shrouds and intermediates keeping the mast in column and absorbing bending moments from the various directions. With an A-frame you only have the cross bar units which with a side load will allow both masts to bend out of column and even oscillate athwartships over some time. Without spreaders and shrouds mounted exterior to the masts there is nothing to stop this oscillation. And those additional spreaders and shrouds would really look weird.
- - For instance, the main sail will put a sidewards force vector on the masts causing them to both bow/bend in the sidewards direction. Tack and the masts will new bow in the opposite direction. It wouldn't take to many times before the aluminum would develop fatigue cracks at the bases and at the crossbar fittings.
- - If you look at those monstrously tall building cranes or even radio/TV towers you will see that they use 4 legs and diagonal braces running up the column along with the external guy wires.
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Old 20-12-2009, 10:03   #516
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Hallo Downunder
It is possible with some extra work to the hull, I have looked into it and have discussed it with my friend Gerhard Schein who is the builder of the SMG 50 with A Frame .
The high weight, the extra windage and the higher cost made me decide not to offer it on the FastCat, I find the mast a nice very comfortable to work with , the convenience of having 2 roller furlings genoa's is great but adding 400 kilo to the top of the boat is not my choice.
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Old 20-12-2009, 15:12   #517
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It'll be interesting to see if the structure is robust enough to handle the fore and aft and side to side torque.

Quote:
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Here are a few pictures of the electric drive system
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Old 21-12-2009, 00:16   #518
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Hallo Joli

the system is designed to take a force of 2000 kilo in any direction and so is the attachment area of the Cat, we will start the testing in January and only after having encountered all types of weather will we continue with the next Fastcats under construction, The Hydraulic actuator has been tested and tried for a long time under lab conditions together with the motor.
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Old 20-09-2011, 15:59   #519
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Re: Electric Main Drive(s)

Do you have a cost for a Fast Cat drive system to be retrofitted onto an existing cat? I would love to lose the diesels and saildrives on my Conser 47 and go back to the dagger boards it was designed with replacing the mini keels. I will need to add a diesel since I want to have sufficient range under power.
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Old 20-09-2011, 16:30   #520
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Re: Electric Main Drive(s)

Just "wag"-ing it, a fortune. The cost of old engine(s) removal, propeller shaft(s) removal and hull repair(s) and then the bracing and brackets for mounting the electric pod engine with cables, genset, batteries, battery boxes, and various controllers is one huge amount of stuff and work.
- - It most likely is so much more economical to design and build the system into a boat like the FastCat from the beginning rather that trying to convert a existing diesel engine boat.
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Old 20-09-2011, 17:18   #521
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Re: Electric Main Drive(s)

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Originally Posted by osirissail View Post
Just "wag"-ing it, a fortune. The cost of old engine(s) removal, propeller shaft(s) removal and hull repair(s) and then the bracing and brackets for mounting the electric pod engine with cables, genset, batteries, battery boxes, and various controllers is one huge amount of stuff and work.
- - It most likely is so much more economical to design and build the system into a boat like the FastCat from the beginning rather that trying to convert a existing diesel engine boat.
Not if you can confidently do the work yourself. Then it's only material costs.

I considered it for my Monohull at one time but I still have that little bit of a racer in me and don't really like dragging around a 3 blade prop all the time. Besides one still needs to have a genset and a bunch of batteries and fuel tank that still takes up all that space of a full size motor.

IMO the electric motors are more suited for Cats or large vessels.
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Old 20-09-2011, 18:12   #522
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Re: Electric Main Drive(s)

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Not if you can confidently do the work yourself. Then it's only material costs. . . .
Very, very true and in almost all areas of boat repairs, re-fit or installations. It amazing how much money you can save when you can do the work yourself rather than spend $100/hour +/- for somebody else to screw up the job and then have to do it twice - and they bill you for the whole amount of time.
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Old 20-09-2011, 23:53   #523
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Re: Electric Main Drive(s)

Hallo Runaway yes we can help you , just forward your e mail address to info@africancats.com

greetings

Gideon
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Old 27-12-2011, 16:25   #524
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Re: Electric Main Drive(s)

It appears "Sea Minx" the first (only) Green Motion Fastcat has been burned to the waterline.

Sea Minx burns out in Richards Bay small craft harbor - Boating Gallery - Boating - SEALINE - South African Angling and Boating Community
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Old 28-12-2011, 11:30   #525
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Re: Electric Main Drive(s)

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It appears "Sea Minx" the first (only) Green Motion Fastcat has been burned to the waterline.

Sea Minx burns out in Richards Bay small craft harbor - Boating Gallery - Boating - SEALINE - South African Angling and Boating Community
Should be a new thread.
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