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Showing results 1 to 20 of 20
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Search: Posts Made By: pvajko
Forum: Sailboat Design and Construction 04-10-2013
Replies: 193
Views: 22,519
Posted By pvajko
Re: Modern Hull forms and Motion Comfort

Jeff, would you mind giving us a few examples?
Forum: Diesel 03-05-2013
Replies: 44
Views: 11,245
Posted By pvajko
Re: rebuilding Oberdorfer Pump

Great! Thanks. I was just wondering if I need to replace the HX zinc every year, but looks like I better do.
Forum: Diesel 03-04-2013
Replies: 44
Views: 11,245
Posted By pvajko
Bronze fittings?

I'm replacing my Oberdorfer n202-15m pump and just wondering what fittings to use. I have a 3/8 NPT to 5/8 barb elbow and a straight 3/8 NPT to 5/8 barb nipple on the old one, I don't know if it is...
Forum: Cruising & Liveaboard Forum 12-22-2012
Replies: 846
Views: 97,284
Posted By pvajko
Re: German Yacht Magazine Article on Full vs. Fin Keel

Don't know what do you mean by heavy, the Vindö is 5 tons, that's true, but the HR 29 is 4, the Sun Odyssey 3.9. That 100kg makes all the difference?
Forum: Cruising & Liveaboard Forum 12-22-2012
Replies: 846
Views: 97,284
Posted By pvajko
Re: German Yacht Magazine Article on Full vs. Fin Keel

The title is full vs. fin keel and may be misleading, but the article has lots of information and detailed explanation on the hull shape as well.
Forum: Cruising & Liveaboard Forum 12-22-2012
Replies: 846
Views: 97,284
Posted By pvajko
German Yacht Magazine Article on Full vs. Fin Keel

The 25/26 issue of the German bi-weekly Yacht magazine has a very interesting article comparing a full keel (Vindö 40, 31ft, 1971), a moderate fin keel with skeg (Hallberg Rassy 29, 1981) and a...
Forum: Cruising & Liveaboard Forum 04-20-2012
Replies: 846
Views: 97,284
Posted By pvajko
Re: Full or fin keel?

Well, when I was young, I had a 470 and it was really great fun sailing that boat. But you know, if it's really like a big 470, then that is certainly not something for cruising.
Forum: Cruising & Liveaboard Forum 04-12-2012
Replies: 846
Views: 97,284
Posted By pvajko
Re: Full or fin keel and a dozen other marginally related topics

Jeff, glad you are back.



I'd love to hear your opinion on this particular one (I mean the first part, not the 'how do they market themselves') because I almost bought one last year but then...
Forum: Cruising & Liveaboard Forum 03-31-2012
Replies: 846
Views: 97,284
Posted By pvajko
Re: Full or fin keel?

No, Paolo, Marchaj writes on page 224 that Fig. 111. refers to capsizing tests made in the USA (honestly, I'm getting tired of scanning the book every time you tell me it's not true what I'm writing,...
Forum: Cruising & Liveaboard Forum 03-30-2012
Replies: 846
Views: 97,284
Posted By pvajko
Re: Full or fin keel?

Looks like Marchaj did , see this figure on the left.

Peter
Forum: Cruising & Liveaboard Forum 03-30-2012
Replies: 846
Views: 97,284
Posted By pvajko
Re: Full or fin keel?

That sounds very interesting Paolo, that is what I was asking for all the time, scientific evidence proving Marchaj was not always right.
Forum: Cruising & Liveaboard Forum 03-30-2012
Replies: 846
Views: 97,284
Posted By pvajko
Re: Full or fin keel?

See attached.

Now let us see your paper.
Forum: Cruising & Liveaboard Forum 03-30-2012
Replies: 846
Views: 97,284
Posted By pvajko
Re: Full or fin keel?

That's really odd, could you give us a link to that paper?

(I hate to mention, but Marchaj's book also references tank tests showing boats are more likely to capsize without the mast, but he is...
Forum: Cruising & Liveaboard Forum 03-30-2012
Replies: 846
Views: 97,284
Posted By pvajko
Re: Full or fin keel?

Well, Paolo, I (the forum engine) quoted that from your own post, click on the little arrow in the quote box and you'll see.

But we seem to be talking about two different things. I'm talking about...
Forum: Cruising & Liveaboard Forum 03-30-2012
Replies: 846
Views: 97,284
Posted By pvajko
Re: Full or fin keel?

Paolo,

I'm still struggling with these two statements, one from you:



And this one from Jeff:
Forum: Cruising & Liveaboard Forum 03-26-2012
Replies: 846
Views: 97,284
Posted By pvajko
Re: Full or fin keel?

BTW Jeff, doesn't this imply that Paolo's argument with full keel boats "tripping over the keel" vs. fin keels moving easily sideways is incorrect?

It appears that the two statements contradict...
Forum: Cruising & Liveaboard Forum 03-26-2012
Replies: 846
Views: 97,284
Posted By pvajko
Re: Full or fin keel?

Jeff, I'd like to thank you for your reply, this is exactly what I wished for, reasoning based on physics and not on authority. I really appreciate you took the time.


I'm not a native English...
Forum: Cruising & Liveaboard Forum 03-18-2012
Replies: 846
Views: 97,284
Posted By pvajko
Re: Full or fin keel?

Jeff, don't misunderstand me, I'd love to be mistaken on this. I have a fin keel boat which is perfectly safe I guess for where I sail it.

I always had the impression though that for off shore...
Forum: Cruising & Liveaboard Forum 03-17-2012
Replies: 846
Views: 97,284
Posted By pvajko
Re: Full or fin keel?

Can you recommend a newer one, at least as good as his, backed with solid physics and math?
Forum: Cruising & Liveaboard Forum 03-16-2012
Replies: 846
Views: 97,284
Posted By pvajko
Re: Full or fin keel?

Just wonder if anybody here read Marchaj's book 'Seaworthiness: The Forgotten Factor' where he shows why: the most important reason is that a full keel with its bigger surface area damps the rolling...
Showing results 1 to 20 of 20

 

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