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Showing results 1 to 25 of 82
Search took 0.01 seconds. Search: Posts Made By: Sparohok
Forum: Leopard Catamarans, Robertson & Caine 23-11-2011, 00:59
Replies: 46
Views: 14,365
Posted By Sparohok
Re: 42' Leopard - Do I Really Need a Double Halyard ?

This one is always a brain teaser. But I've been through it enough times with enough experienced racers and riggers to be sure. Herkam is right. A 1:1 halyard puts more compression on the mast than a...
Forum: Lithium Power Systems 10-11-2011, 01:19
Replies: 7,793
Views: 1,550,987
Posted By Sparohok
Re: LiFePO4 Batteries: Discussion Thread for Those Using Them as House Banks

This keeps coming up because what you are saying seems contrary to laws of physics. Granted, LiFe cells in parallel will not self-balance perfectly if they are in the relatively linear voltage range...
Forum: Lithium Power Systems 08-11-2011, 17:53
Replies: 7,793
Views: 1,550,987
Posted By Sparohok
Re: Simple form of one-off or occasional balancing

One thing I would be concerned about here is current limiting. If the individual cells are at different state of charge, how much current will flow as the cells balance? Will that exceed the charging...
Forum: Lithium Power Systems 08-11-2011, 10:24
Replies: 7,793
Views: 1,550,987
Posted By Sparohok
Re: LiFePO4 Batteries: Discussion Thread for Those Using Them as House Banks

Yes, but Bill was specifically asking about parallel balancing... not series/parallel or series. In parallel, by definition, all cells are at the same voltage.

I just wanted to verify that you are...
Forum: Multihull Sailboats 07-11-2011, 18:47
Replies: 46
Views: 19,987
Posted By Sparohok
Re: Downwind Catamaran Sailing

Dave, I reread your post and realized that I had misunderstood. "Clew to the wind" meaning strapped (oversheeted) rather than luffing. As a result I deleted my reply as soon as I could. Sorry about...
Forum: Lithium Power Systems 07-11-2011, 16:44
Replies: 7,793
Views: 1,550,987
Posted By Sparohok
Re: LiFePO4 Batteries: Discussion Thread for Those Using Them as House Banks

I wish I had a better understanding of Li cell physics. However when I hear things like this I start to wonder if the problem isn't my understanding of batteries, but rather others understanding of...
Forum: Multihull Sailboats 04-11-2011, 03:03
Replies: 96
Views: 21,954
Posted By Sparohok
Re: Gunboats: Any First Hand Info?

I think this more or less exemplifies the difference in design brief between Gunboat and Atlantic cats. If you want to travel the world, buy the Atlantic. If you want to beat people in races, buy the...
Forum: Electrical: Batteries, Generators & Solar 03-11-2011, 14:43
Replies: 84
Views: 28,675
Posted By Sparohok
Re: New Lithium-Ion Batteries

Yes it will. The DC to DC converter will trickle charge your 24 volt thruster bank from the house bank. A 24 volt @ 10 amp DC-DC converter will cost you a few hundred bucks. They are about 90%...
Forum: Electrical: Batteries, Generators & Solar 03-11-2011, 11:13
Replies: 84
Views: 28,675
Posted By Sparohok
Re: New Lithium-Ion Batteries

Be aware - you need a DC to DC converter, not an isolation transformer. Transformers only work with AC. Batteries are DC.

Martin
Forum: Marine Electronics 25-04-2011, 00:22
Replies: 59
Views: 13,957
Posted By Sparohok
Re: Best Camera for Cruising

One other thing to keep in mind... with Japan's current difficulties affecting the global supply chain, a lot of camera equipment is in short supply and prices have risen considerably. For example...
Forum: Marine Electronics 23-04-2011, 23:29
Replies: 59
Views: 13,957
Posted By Sparohok
Re: Best Camera for Cruising

Hi Doodles,

I have a micro four-thirds interchangable lens camera (Panasonic GF1) as well as a waterproof compact camera (Canon D10). These both have some advantages for boating and cruising. You...
Forum: Lagoon Catamarans 03-12-2010, 11:44
Replies: 216
Views: 60,571
Posted By Sparohok
If that's the definition of sunk, then a boat on...

If that's the definition of sunk, then a boat on the beach, in a drydock or on a tidal grid is also sunk. Hmmmm....

Seems to me that a boat isn't sunk until its hull is entirely under water.
...
Forum: Lagoon Catamarans 03-12-2010, 00:30
Replies: 216
Views: 60,571
Posted By Sparohok
Which reports? Link? Everything I've seen on...

Which reports? Link?

Everything I've seen on this thread indicates that it was beached to prevent it from flooding further. The fact that it was beached does not prove, does not even suggest that...
Forum: Lagoon Catamarans 02-12-2010, 09:57
Replies: 216
Views: 60,571
Posted By Sparohok
Well let's be clear. Thread title says "sunk,"...

Well let's be clear. Thread title says "sunk," first post says "almost sunk," later post says "both hulls flooded." You'd need a lot more information to conclude whether or not this boat was actually...
Forum: Deck hardware: Rigging, Sails & Hoisting 26-10-2010, 12:47
Replies: 83
Views: 18,615
Posted By Sparohok
OK let's see if I've got this right. Rake is...

OK let's see if I've got this right. Rake is controlled by headstay length. Backstay tension takes out headstay sag. Thus backstay effectively lengthens the headstay while under sail. I'm going to...
Forum: Deck hardware: Rigging, Sails & Hoisting 26-10-2010, 11:10
Replies: 83
Views: 18,615
Posted By Sparohok
Thanks for the explanation. Unlike a fractional...

Thanks for the explanation. Unlike a fractional boat, then, the ability to tension the backstay and bend the mast comes at the cost of a lot of slack in the forestay when the backstay is detensioned....
Forum: Deck hardware: Rigging, Sails & Hoisting 26-10-2010, 02:38
Replies: 83
Views: 18,615
Posted By Sparohok
OK, I stand corrected.... Can you explain...

OK, I stand corrected....

Can you explain how that works for me? What is the backstay working against to bend the mast?

On a fractionally rigged boat, as you add backstay tension, the masthead...
Forum: Deck hardware: Rigging, Sails & Hoisting 26-10-2010, 01:57
Replies: 83
Views: 18,615
Posted By Sparohok
Akio, I think a lot of the advice you've gotten...

Akio, I think a lot of the advice you've gotten here doesn't really apply to your boat. I imagine that people singing the praises of adjustable backstays for cruising are based that experience on...
Forum: Monohull Sailboats 17-10-2010, 20:16
Replies: 5
Views: 2,685
Posted By Sparohok
I know this is in monohull forum, but I have to...

I know this is in monohull forum, but I have to ask: have you considered trailerable trimarans? If you are looking for the most spacious boat within a given weight limit, a trimaran will be much...
Forum: Multihull Sailboats 14-10-2010, 11:32
Replies: 64
Views: 61,018
Posted By Sparohok
I couldn't agree more! I have always wondered why...

I couldn't agree more! I have always wondered why the 57 gets such love and the 48 barely mentioned. A 57 footer seems like a really ambitious size for an owner-crewed boat, at the outer limits of...
Forum: Seamanship & Boat Handling 12-10-2010, 15:50
Replies: 26
Views: 15,790
Posted By Sparohok
Since Charlie has left the thread, I guess my...

Since Charlie has left the thread, I guess my only reply is to correct the record for everyone else. Here's what Jim actually said in the entirety of his first post in the thread:

"Gosh Bazzer,...
Forum: Seamanship & Boat Handling 12-10-2010, 14:02
Replies: 26
Views: 15,790
Posted By Sparohok
I think Jim Cate quite clearly wanted to insult....

I think Jim Cate quite clearly wanted to insult. Can you imagine any sailor taking his original post as anything but an insult? After the insult was pointed out, he made no attempt to apologize. Jim,...
Forum: Multihull Sailboats 11-10-2010, 21:02
Replies: 16
Views: 6,929
Posted By Sparohok
Based on your criteria (speed first,...

Based on your criteria (speed first, accommodations last, single handed), you should think trimaran not catamaran. For the same money, an ocean cruising tri will have less accommodation, but much...
Forum: Atlantic & the Caribbean 30-09-2010, 12:18
Replies: 284
Views: 106,564
Posted By Sparohok
9 foot draft is a very serious impediment in...

9 foot draft is a very serious impediment in Belize inshore waters. You'll often find yourself constrained to dredged channels and open water.

I don't know the approaches to Sapodilla Lagoon in...
Forum: Dollars & Cents 21-03-2010, 09:37
Replies: 19
Views: 38,733
Posted By Sparohok
I don't think anyone has ever claimed 10%-25% of...

I don't think anyone has ever claimed 10%-25% of purchase cost / year on maintenance alone. That is a strawman.

I think 10%-25% of purchase cost per year as a total cost of ownership sounds like...
Showing results 1 to 25 of 82
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