stability

I’ve been posting here recently about Navacal.com which i created, but there’s a bit of background story to it. Over the past few years, I went back to basics and taught myself small boat design and naval architecture properly through distance learning courses, online resources and books, and a...

I am pleased to propose you this new (and probably last) version 3.5 of « Gene-Hull Sailboat » and its post applications Gene-Stab and Gene-VPP , free applications dedicated to the early stage project of sailboat (keel boat, daysailer, cruiser, racer). This new version 3.5 includes some...

Hi, We have a 23' Deep V runabout (24° transom) that is unnervingly unstable at rest. The boat was built too light. Can HPDE be used as bolt on sponsons?

Hi everyone, I’m Gianandrea, a naval architect and yacht designer based in Palma de Mallorca. I’d like to share a Rhino plugin we developed called Swordfish 3D. It runs entirely inside Rhino and it aims to cover the same kind of day to day workflow many of us do with other more famous tools...

Maxsurf 2 This is the second course in our Maxsurf series, and it focuses on three key modules: Maxsurf Modeler, Maxsurf Stability, and Maxsurf VPP, guiding you through the core tools used in hull modeling, stability analysis, and performance prediction. – MODELER Although we explored Maxsurf...

I am sourcing materials for a paravane build on our 55' steel trawler. Correct boom size, material and length are my main concern. Thank you

Hi, Does the calculation of weather criteria is mandatory for coastal pilot vessels of 13 metres in length?

Thank you in advance for your guidance, information or leads. I have a Maurell 4010 Pontoon in Hawaii. The USCG informed me this vessel is able to obtain a COI, yet I need to submit detailed plans that include how it was built . Maurell was sold to Crest and Crest does not have ANY records...

Could anyone here help me calculate this? I'm fresh to this and I don't really understand it yet. If I got the "idea" right, I'm supposed to calculate the difference in heel angle and then use the wind moment to draw it on the gz curve?

Considering how things are going with work, and what we are paying for delivery, there's a real business case to be made for a small landing craft barge. SOR Carry a full sized, fully loaded pickup, safely over moderate seas. Locale is east Coast of Vancouver island. Land on a beach, and...

Hello everyone, I came around one problem considering calculation of point 6.5 Recess size in ISO 12217:2015 standard for DC B. I am working on stability calculation for open motor boat (some thing similar to Axopar 37 Sun Top). Boat has two cockpits, one infront (i first 1/3 of LH) and one...

I am pleased to propose you this upgraded version 3.3 of « Gene-Hull Sailboat » and its post applications Gene-Stab and Gene-VPP. I remind you that they are free spreadsheet applications developed with OpenOffice Calc, and dedicated to the early stage project of sailboat (keel boat, daysailer...

Hi, I would like to know what is the dynamic Angle that refers to this section 11.10.3.1. From what i understand is i measure the area A (GZ area) and compare it with B (wind area). whenever the wind area meets the so called 40% of GZ Area curve that will be my dynamic angle? And it should be...

Hi, I would like to know how to determine the downflooding angle of the barge? I can't seem to decide because barge is a box shape vessel. From what i know so far. When the barge manhole (blue rectangle) hits the waterline that will be my Downflooding angle? Because i know deck immersion is...

Hi, I would like to determine how to calculate the area in the attached. You can see there are two area columns one is for righting and one is for heeling. I've tried using Simpson but I can't seem to reverse engineer the formula of the area. Please see attached file for your reference...

Hello Everyone, I'm using Maxsurf Stability Ultimate CONNECT Edition (Student Version) while running stability for container vessel it shows error and shows these comment "stability was unable to converge to the desired precision". Please, help me to solve problem, thanks. Best regards

Hi, How to connect the sea state and vessel depth or freeboard for a particular route? Is there any minimum freeboard for a sea state? Is it okay only to consider the minimum wave height from the range of a particular sea state?

Hello all, My question is about stability calculations for a small watercraft. Which calculations do you make and which rules you look for when you carry out stability calculation for your own design? Any method to follow? Or any recommended software(with the theory of the used method)...

Hi All, I want to ask is there any criteria or requirements on the degree steps of calculating the GZ curve. For example, I am using maxsurf stability, it calculates the GZ curve at angle of heel from -5 to 80 degrees in steps of 5 degrees, and from 80 to 120 degrees in steps of 10 degrees...

What should be the range of metacentric height for catamaran and trimaran passenger ships? I know, GM should be greater than 0.15. But what is the maximum permissible GM for a passenger catamaran/trimaran?