Vertical center of gravity

English spoken IF-boat forum for all topics.

Moderator: Moderator

Menno
Inlägg: 3
Blev medlem: 20 mar 2023 16:53
Has thanked: 1 time

Vertical center of gravity

Inlägg av Menno »

Hello,

In the Netherlands, a group of IF-boats sail under ORC rating. We did very well in regatta’s, and discussions about our rating followed. The Dutch ORC authorities decided to manually adjust our Vertical Center of Gravity (VCG) to -0,45 cm. This is approx. 45 cm below the waterline. Our ORC rating changed in our disadvantage.

I was wondering whether there is any knowledge about the stability/VCG of the IF-boat in this community? Maybe a longshot, but any information would be helpfull.
Användarvisningsbild
johan swe-1870
Global moderator
Inlägg: 2445
Blev medlem: 24 aug 2006 09:43
Segelnummer: 1870
Båtnamn: InFinit
Ort: Råå
Has thanked: 109 times
Been thanked: 67 times

Re: Vertical center of gravity

Inlägg av johan swe-1870 »

That's an interesting question!

In the drawings I can find that the center of gravity is 4250 mm from the stern. But that is only the COG horizontal position. I can't find any reference to where the vertical position might be.
Johan Winberg, SWE 1870 InFinit
Användarvisningsbild
maja
Moderator
Inlägg: 2815
Blev medlem: 19 aug 2006 09:56
Has thanked: 3 times
Been thanked: 58 times

Re: Vertical center of gravity

Inlägg av maja »

To make a proper calculation/estimation you have to make an inclining test with the boat in the water. I have made theoretical calculations. See old issues of Medvind where results are published.
Marek, IF-båt SWE-829 "Ingela" från Lagunen i Malmö
Medlem i IF-båtförbundet sedan 1985
IF-båtägare sedan 1983
Skriv svar