For the bar stem there is a hump, and in the position of joint with the keel there is a hogging.
There can be you have found the good prototype with very close ship dimensions and for this purpose expect T=2,2m. But if it no and the draft of the full vessel is still unknown then to have to arrange not less than 4-5 prototypes which to you should be compared for an estimation of the loads and accordingly the draft of the light and full vessel.
Location: Spain Do you really think Savitsky method is applicable to this ship ?. We are going to see, for the first time in the history of mankind, a fishing boat of this type operating in planing mode. Hardly the author of the project wants the vessel was slid slowly as itself has picked a gliding hull form! As is known from the planing theory if the vessel have speed relevant Volumetric Frude number Fnv=from 1 to 3 then we have a transient regime of movement, and at Fnv => 3 then we have a mode of pure gliding. Whether this version the stationary engine with such power is possible to install on wood vessel? But as I have said for the first time, we shall better keep the author himself to decide the problems! I repeated the calculations and now kmt is not negativeAs you said there is some problems in the model probably on the skeg.
Band covering keel from above should be removed, because calculations on hydrostatics display untrue outcome - without the cubage of volume of keel. Before to begin correction of the side in Rhinoceros 5 it is necessary to save Deck line in the fore.
I want to explain you too and how the internal constructions influence calculations on hydrostatics. I have tested it on my back in an extent some sleepless nights until then while have understood where I am mistaken.
If in the model there are traced internal constructions, for example: double bottom, lower deck, longitudinal and transverse bulkheads and so on, on hydrostatics or is impossible to make calculations or false. It is received from for that programs for making the mathematical model of the outboard shell of the vessel demand as compulsory condition of the normal to the created surfaces had directions from the inner side of the vessel out to water, i.e. Everything else if it is traced, it is necessary to put in separate layers which should be frozen at calculations on hydrostatics, intact stability and unsinkability. It will be better if the file inclusive only shell plating, deck and transom, to save separately, and internal constructions to inscribe in other file.
Even when you work with Maxsurf Stability there is no necessity to draw internal constructions. NA Razmik Baharyan Rabah View Public Profile View Rabah's Gallery Find all posts by Rabah Page 3 of 3 < 12 3 « ISAF OSR Cat_0 Self-righting sailboat? Leviathan II whale-watching expedition capsized off Vancouver Island » Thread Tools Show Printable Version Email this Page Display Modes Linear Mode Switch to Hybrid Mode Switch to Threaded Mode Search this Thread Advanced Search Similar Threads Thread Thread Starter Forum Replies Last Post Maxsurf problem ! When making potentially dangerous or financial decisions, always employ and consult appropriate professionals.
I have been using maxsurf to design hull for a while know, but mostly sailing hull with round shape.
I woul like to design a planning hull thistime for a power boat and I don't really know how to create 90° angle for my shine of the sides of my boat. Location: australia Steph357 the way I do it is to create two or three linear surfaces and join them then add control points to adjust the shape, here is an example. Location: Shanghai Ok I see, I tried lot's of things but not this one, thank you very much it will be very helpfull. Location: uk Lots of surfaces can cause you problems in hydromax unless you are careful and if you have limited surface this can sometime not be an option.

You can always change the flexibility of the surface if it is a fully chined shape which is the simplist way! Location: Shanghai I tried your way Yachty, but I found it hard to move the point after to have a very right angle and a fair shape. Location: malaysia TANSL, let say i want to design 50m tanker with bulbous bow. Something very different is how to define the total volume of the bulb, the maximum sectional area, its position on the forward pperpendicular, etc.
You have tried to help Alex, but your experience was unsuccessful - your model on Maxsurf has no keel, deck and transom. As against you I have had time to make good model and Alex have already thanked to me with the letter. I wrote to him that all this should be determined with calculation, then to pick criteria about an intact and damage stability so that were fulfilled the requirements simultaneously on LR and ISO and to make calculation on Maxsurf Stability.
Thanks for advisories and kind wishes, but I insist that you knew, that I was not worse than you or what - be other ship-building expert, writing in the forum, is familiar with the International code about an intact stability of vessels.
From just now published image it is visible, that the lower edge of ventilation cut-outs is almost on equal levels from the upper edge of the door-coaming for the superstructure. As the door is near to CL, follows that for the offset it is necessary to take more dangerous event at which water will penetrate in the hull, that is the most removed from CL point of the lower edge of air vent, Y = ± 1,55m. For rough, approximate calculation of an intact stability for the most reference event of loads - Full Displacement, these criteria are quite sufficient. In program Delftship Pro as well in Maxsurf Stability, the wind pressure which has maximum value 504Pa for unlimited navigation area is accepted only.
But if we want to make calculations of an intact stability on ISO 12217-1 or approximately at program Orca3D then it is necessary to use wind velocity Vw. At last I too have advisory to you - only one: Dear Tansl, before could declare that what - be calculation is erratic, you should prove it with calculations! Obviously that Tansl any more have not remained other arguments, but he does not want to recognize that has written not quite considered text. Calculation on stability criteria on Maxsurf Stability it is possible to see in the added file. I has tested at so chosen stability criteria how much can to be the maximum allowable value VCG for full displacement. It has appeared that at VCGmax=1,75m the ship will not meet the requirements any more criterion of weather. I?m looking for a way to convert my Maxsurf .IGES hull , into an editable surface in Solidworks (with control points) , without having to reloft a hull from Maxsurf sections . 5- Use the Boundary Surface command to reconstruct the surface wich now is controlled by your 3dsketches.
I have already trimmed the transom as you can see from the attached image, but when I try to trim the hull and create a notched transom, after I perform the trimming, the surface looks like before, i.e. Location: Perth, Western Australia How many control point columns does your trimming surface have?
Maxsurf trimming can fail when too many columns or rows are compacted together to give a hard corner in the surface.
Also check that all centreline points for all relevant surfaces are actually on the centreline, i.e. The surface has a 3 by 2 control points as you can see in the attachment photo and is linear in both directions (transverse and longitudinal). Location: Everywhere Ok, just now I managed to trim the hull the way I wanted. Location: China The trim funtion in Maxsurf sometimes just not work well for no reason.

Rhino problem » Thread Tools Show Printable Version Email this Page Display Modes Linear Mode Switch to Hybrid Mode Switch to Threaded Mode Search this Thread Advanced Search Similar Threads Thread Thread Starter Forum Replies Last Post Trim tab options between bennett and kplanes? Location: San Francisco The best I can do is from the Theroy of Wing Sections. Location: indonesia can I bond edges surfaces from rhino in maxsurf easily? Location: Australia Maxsurf does require that the surfaces to be bonded share the same number of control points, same stiffness and the same knot vector.
The best approach is to create your large fair surfaces in Maxsurf first, then move them to Rhino for modelling of other parts where the Rhino tools are helpful. The top of the side at the bar stem has corrected by importing your file from Maxsurf in Rhino 5. Except for that is exact in this zone there is a dark spot in the shell plating which is meant with a cavity.
Find attached the model a screenshot of how a skeg can be created without trimming by using Maxsurf's inbuilt ability to close the boundaries. Rabah How did you correct the bow cone problem in rhino?For your last post I think the difference with orca3d is due to the different analitical approach of the programs.
The information for the walls of tanks and for the bulkheads of cargo tanks is included into the general table, and location of the transversal watertight bulkheads enters in the program as an additional information, without necessity of their visualization. It is not necessary to confuse an initial trim of a dead ship in the water to a running trim angle when the fore is lifted from for the elevating force on the bottom. On my calculations it is on Z ≈ 2,6m from adopted by me BL which is on 0,705m from the lowermost point of keel. But GMt must be to correct for effect of free surfaces of a liquid load on an intact stability. Normally the knot vector will be the same, exceptions occur when you have used Rhino commands to create some kind of discontinuity. But when I want to get a section in baseline (WL-0) and the buttock for side flat, i got poor section lines. For this purpose when it is necessary to calculate hydrostatics, to suffice only the surface ensuring tightness - bottom, side, deck and transom. That is mean the ballast in the keel sinks CG of the ship for deduction of a good intact stability at 5 metric waves. Then at the bow I compacted the two control points one on either side of the joint points on to the centre point then bonded the edge then grouped them into one. Importantly, how many columns of control points are being used to form the 90 degree corner in the trimming surface. Maxsurf encourages you to create fairer surfaces whereas Rhino offers more modelling options at the expense of allowing you to make less fair surfaces. There is a sense in their installation only if will be is support of a deck, but I do not see a deck above them.
Please do not go into the details of the model because its just a rough model and not meant for any project.
From the lower point of the keel this distance will be 2,105m as it is specified in Planing Analysis Report.
I hope what is it will not be to you irritate, but you know that it is impossible to find two people equal on taste.
There is a three surface and a four surface which gives a bit more control over the bulb shape.

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