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Showing results 1 to 25 of 180
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Search: Posts Made By: BryceGTX
Forum: Boat Review and Purchase Forum 08-10-2013
Replies: 5,183
Views: 328,514
Posted By BryceGTX
Re: Pros and cons of steel sailboats

And you say that reduces to this formula from your previous post?



It seems the above formula is missing something as it does not result in units of force. Now a divide sign between v and t...
Forum: Boat Review and Purchase Forum 08-10-2013
Replies: 5,183
Views: 328,514
Posted By BryceGTX
Re: Pros and cons of steel sailboats

His exact statement is below. He clearly is talking only about the keel itself and describing the total force based on strength. Nothing to do with the hull. He is also not saying the keel can...
Forum: Boat Review and Purchase Forum 08-08-2013
Replies: 5,183
Views: 328,514
Posted By BryceGTX
Re: Pros and cons of steel sailboats

You are talking about two things here. Million pound forces and impact forces. These are quite different things the way I see it. You are also mixing PSI and forces.

Brent specifically mentions...
Forum: Boat Review and Purchase Forum 08-08-2013
Replies: 5,183
Views: 328,514
Posted By BryceGTX
Re: Pros and cons of steel sailboats

It seems to me you are speaking apples and oranges. Brent is simply giving a calculation that is perfectly correct. His statement is only to give the impression that the keel is strong. And his...
Forum: Cruising & Liveaboard Forum 01-10-2013
Replies: 846
Views: 90,158
Posted By BryceGTX
Re: Full or fin keel?

That is your opinion.. there are many of us that would argue forever against this because we have experience with light boats and heavy boats. I guarantee, if you do not pick the heavy boat over the...
Forum: Boat Review and Purchase Forum 01-10-2013
Replies: 154
Views: 300,966
Posted By BryceGTX
Re: Blue Jacket 40 (new racer/cruiser)

I have yet to hear a convincing argument from you that states otherwise. You need to keep in mind that the Catalina 400 is not your run of the mill deep-v rough water boat.

Clearly your top view...
Forum: Boat Review and Purchase Forum 01-10-2013
Replies: 154
Views: 300,966
Posted By BryceGTX
Re: Blue Jacket 40 (new racer/cruiser)

Keep in mind that the Catalina 400 was marketed as a racer cruiser when it came out in 1995. It has a radically different hull than the 387 and quite a bit different hull than the 42.

It...
Forum: Boat Review and Purchase Forum 01-10-2013
Replies: 154
Views: 300,966
Posted By BryceGTX
Re: Blue Jacket 40 (new racer/cruiser)

We are comparing the shoal draft boats.. that means the First is only a foot deeper. As I said earlier.. it is doubtful the First produces any more RM with the keel because the Catalina gains 700...
Forum: Boat Review and Purchase Forum 01-10-2013
Replies: 154
Views: 300,966
Posted By BryceGTX
Re: Blue Jacket 40 (new racer/cruiser)

Since our boat is on the hard for winter storage, this morning I went to our boat and measured the LWL. I dropped plumb bobs from the water mark at the bow and then at the stern. I measured the...
Forum: Boat Review and Purchase Forum 01-09-2013
Replies: 154
Views: 300,966
Posted By BryceGTX
Re: Blue Jacket 40 (new racer/cruiser)

Stiffness is the derivative of the RM. So it has everthing to do with RM.



Oh I think we are a hardy bunch of souls and can take it.. ;)
Bryce
Forum: Boat Review and Purchase Forum 01-09-2013
Replies: 154
Views: 300,966
Posted By BryceGTX
Re: Blue Jacket 40 (new racer/cruiser)

Clearly.. the Catalina 400 has a higher RM and it has more mass.. and it has more beam.. fuller body.. similar flat hull.. and it has more LWL.. But you are convinced the lighter boat is stiffer?
...
Forum: Boat Review and Purchase Forum 01-09-2013
Replies: 154
Views: 300,966
Posted By BryceGTX
Re: Blue Jacket 40 (new racer/cruiser)

Again.. where is this GZ curve you mention??
Bryce
Forum: Boat Review and Purchase Forum 01-09-2013
Replies: 154
Views: 300,966
Posted By BryceGTX
Re: Blue Jacket 40 (new racer/cruiser)

Yep.. and when you see them for real.. not just pictures.. it becomes even more convincing.
However, in a discussion of stiffness in respect to heeling, not sure why you are showing a side view of...
Forum: Cruising & Liveaboard Forum 01-08-2013
Replies: 846
Views: 90,158
Posted By BryceGTX
Re: Full or fin keel?

Really?? I think keel design is mostly what this thread is about and keel design has been shown to be important.

BTW.. weight and inertia are radically different things.
Bryce
Forum: Cruising & Liveaboard Forum 01-08-2013
Replies: 846
Views: 90,158
Posted By BryceGTX
Re: German Yacht Magazine Article on Full vs. Fin Keel

Clearly comparing a 33 foot to a 30 foot boat does not make sense. On the other hand, there are 30 footers with more beam that would result in considerably more stiffness.

The problem is that you...
Forum: Boat Review and Purchase Forum 01-08-2013
Replies: 154
Views: 300,966
Posted By BryceGTX
Re: Blue Jacket 40 (new racer/cruiser)

I am going to guess that you somewhat confused about the stifness of the Catalina 40 and how it compares to a First 40. So lets just put it into laymans terms.

To get a First 40 to the stiffness...
Forum: Boat Review and Purchase Forum 01-08-2013
Replies: 154
Views: 300,966
Posted By BryceGTX
Re: Blue Jacket 40 (new racer/cruiser)

Clearly, the most extreme case would be to compare the USS Aircraft Carrier Enterprise with a Beneteau First 40.. On the other hand, such a comparison does not get us anywhere closer to comparing...
Forum: Boat Review and Purchase Forum 01-08-2013
Replies: 154
Views: 300,966
Posted By BryceGTX
Re: Blue Jacket 40 (new racer/cruiser)

LOL.. another mouthful.. how do you get to a discussion about dynamic stability from a simple comparison of two specific boats stiffness??

How does this have anything to do with the stiffness of a...
Forum: Boat Review and Purchase Forum 01-08-2013
Replies: 154
Views: 300,966
Posted By BryceGTX
Re: Blue Jacket 40 (new racer/cruiser)

Now there's is a mouthful..

Clearly GZ curves are not the design criteria for any sailboat. If it were, all 40 foot boats sailboats would be 40 feet wide. Making a very stiff boat. Similar to a...
Forum: Boat Review and Purchase Forum 01-08-2013
Replies: 154
Views: 300,966
Posted By BryceGTX
Re: Blue Jacket 40 (new racer/cruiser)

ROG... I would love to hear this discussion.

Both curves are static curves. Perhaps someone else would like to explain to Paulo the relationship of these two curves. :)

Clearly neither curve...
Forum: Boat Review and Purchase Forum 01-08-2013
Replies: 154
Views: 300,966
Posted By BryceGTX
Re: Blue Jacket 40 (new racer/cruiser)

Stiffness is not usually used as a metric for performance. And clearly, the GZ diagram is not used at a criteria for stiffness. Perhaps this is why you are confused.

A GZ diagram is simply a...
Forum: Boat Review and Purchase Forum 01-08-2013
Replies: 154
Views: 300,966
Posted By BryceGTX
Re: Blue Jacket 40 (new racer/cruiser)

For a given generation of boats, the cruisers always tend to be more stiff at low angle of heel because the most important person in our lives does not like to walk around on a deck that is not...
Forum: Boat Review and Purchase Forum 01-08-2013
Replies: 154
Views: 300,966
Posted By BryceGTX
Re: Blue Jacket 40 (new racer/cruiser)

LOL.. good plan.. you would hate to prove yourself wrong eh??
Bryce
Forum: Boat Review and Purchase Forum 01-08-2013
Replies: 154
Views: 300,966
Posted By BryceGTX
Re: Blue Jacket 40 (new racer/cruiser)

Performance boats will always have more sail area for the simple reason, that to go faster in light wind requires more sail. This to me is a no brainer and is widely known in the literature.

Bryce
Forum: Boat Review and Purchase Forum 01-08-2013
Replies: 154
Views: 300,966
Posted By BryceGTX
Re: Blue Jacket 40 (new racer/cruiser)

Stiffness has nothing to do with power. Perhaps this is your misunderstanding. Stiffness is simply a characteristic of the RM diagram.

The amount of sail area is related to the RM value not the...
Showing results 1 to 25 of 180

 

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