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Old 15-03-2008, 09:17   #31
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Brett,

uuuummm....

You're joking right? That's not a solar powered boat. It is a boat that has solar power cells tacked on.

Did I really need to say "powering a boat only with solar power isn't even theoretically possible for the foreseeable future."
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Old 17-03-2008, 23:06   #32
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E motion Hybrids Home

Seems like they have been doing it for a while, just down the road from me. Having a genset seems to be required unless you don't mind hanging loose for a few days while you charge.

I don't get the crawl off lee shore argument. I may not see the whole picture but, from my limited research it seems as if the electric delivers more torque to similar and even larger props . Certainly would need the generator in those conditions....
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Old 18-03-2008, 01:27   #33
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E motion Hybrids Home

Seems like they have been doing it for a while, just down the road from me. Having a genset seems to be required unless you don't mind hanging loose for a few days while you charge.

I don't get the crawl off lee shore argument. I may not see the whole picture but, from my limited research it seems as if the electric delivers more torque to similar and even larger props . Certainly would need the generator in those conditions....
Dave Tether the owner of e Motion is the founder of Solomon Tech. and knows his business.
He relies mostly on regenerative power and the use of backup generators.
I feel that specially on a catamaran it is possible to install enough solar and wind power , combined with the latest Lithium Ion Phosphate batteries to store enough power that a generator is not necessary unless you are in a hurry.
We install up to 2300 Wp of solar power on a FastCat 435 plus 1 or 2 wind generators adding up to 600 watt per hour.
In a average day we get as much as 20 KW in or enough to run one motor in excess of 6 hours at an efficient setting, when the sun is out and wind is available one motor can run at slightly higher than the extreme efficient setting adding speed to the FastCat 455 otherwise this energy is wasted anyway.
I believe that what we have created in terms of efficiency is the best but at a cost.

Gideon
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Old 18-03-2008, 03:54   #34
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Hi everybody,

Just to make clear:

I'm probably a little bit ahead of technology.

Yes, it's supposed to a kind of stunt and I'm aware that I'll not beat any circumnavigation sailing record done under sails. I'll alos stay in area where there is a lot of sunshine. So, I'm not going around Cape Horn.

If there is no sun, I'll have to wait for it if running out of battery energy. That's a little bit like an (ocean) saling race where the guys are not allowed to use their engine: What do they do if there is no wind? They wait for it...

It will not be possible to make sails of silicon solar cells because they might break and can not be folded. Maybe there will be more flexible organic or other solar cells one time, but not at the moment. And the solar cell in sails would not be well exposed towards the sun around noon when there is the maximum energy available...

Anyway, I know now it's possible as a stunt, I just need to be patient as I will depend on weather like sailors and figure out which is the best cat and the best propulsion system...

Greetings from Paris,

Kai
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Old 18-03-2008, 04:19   #35
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Interesting that the old Snowgoose 37 with it's standard 27hp is listed somewhere on these threads as doing 18kn under power.
Cough (bullshit) Cough

8 maybe

I'm doing a light 50 footer with a 12.5:1 BWL with 65hp a side and only expect 14knots on the fly on a good day

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Old 18-03-2008, 04:34   #36
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Somebody with a Snowgoose needs to get his log ( or his head ) recalibrated even 8 is almost impossible with 2 x 27 Hp yanmars
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Old 18-03-2008, 05:51   #37
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Somebody with a Snowgoose needs to get his log ( or his head ) recalibrated even 8 is almost impossible with 2 x 27 Hp yanmars
I was being generous and didnt want to offend.

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Old 18-03-2008, 06:09   #38
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Prout Snowgoose Performance
Excellent postings by several showing their experience. My Prout Snowgoose was the largest of the canoe stern older models she was extremely efficient either under sail or engine. Have always considered those Prouts to be true motor sailers with excellent hulls, absolutely no turbulence in the thin wake.
During sea trials in England, before loading her heavily for comfort and fun (dive gear, compressors, arms and ammo,) we did 11 knots by GPS by sail and 13 by engine (I maintained an inventory of props for best use).
The Prout is heavily dependent on the headsails and a proper airfoil slot between the staysail and main (min-sail).
She did not point well, I admit, but being an aviator and navigator more than a purist sailor had no problem calling on engine (on long crossings I run the engine at night regardless).


I took the trouble to search this time. I admit to a small error but I hope one and all can admit that the old 'goose was a clean machine. OK 18 v 13 is double the power.
If you need more data talk to the man or check out the data and sail areas provided in Multihullworld's supporting blurb for the one they have on sale. Most were fitted with one Yanmar on a sillette drive leg. Prop shafts, to my knowledge, weren't a good idea then. (Either.)
These were built and sold for cruisers, they were ultra safe, they performed quite well. I suspect that cruisers in those days didn't take fridges and a/c with them so were generally lighter that is considered comfortable nowadays.
I take no responsibility for the data provided. And it would make a good trials model.
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Old 18-03-2008, 06:39   #39
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Quote:
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Interesting that the old Snowgoose 37 with it's standard 27hp is listed somewhere on these threads as doing 18kn under power.
So 18 is now 13

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Prout Snowgoose Performance

and 13 by engine (I maintained an inventory of props for best use).
.
any takers on 8 or less?

You'll get more power from a shaft and prop than a sonic/sillete as well (I would suggest)

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Old 18-03-2008, 06:40   #40
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Prout Snowgoose Performance

During sea trials in England, before loading her heavily for comfort and fun (dive gear, compressors, arms and ammo,) we did 11 knots by GPS by sail and 13 by engine (I maintained an inventory of props for best use).
OK 18 v 13 is double the power.

Must have been one heck of a current helping this 'Goose along?

We have many Prout Snowgoose owners on this board. Maybe one could chime in and let us know what they get for average speeds under power in the real world?
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Old 18-03-2008, 07:16   #41
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Must have been one heck of a current helping this 'Goose along?

We have many Prout Snowgoose owners on this board. Maybe one could chime in and let us know what they get for average speeds under power in the real world?
I have sailed the Snowgoose Elite 37 ft and under sail I got a maximum of 11 knots and under power no more than 8 but that was still good for a 37 ft heavy build cat in those days
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