Robert Holme

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  • in reply to: Hull Modelling with stations only #39486
    AvatarRobert Holme
    Participant

    On Maryak’s example, stations 22 to 32 won’t give you very much information, furthermore, they would look like an unreadable big pack of lines, because they’d all look the same.
    The best is to have all three views (side, top, front/back).
    .

    ??? Maybe you are confusing stations with frames i.e. 22 -32 consists of 3 station profiles not 10 all looking the same.
    STYelta_Linesplan.jpg

    in reply to: Hull Modelling with stations only #39466
    AvatarRobert Holme
    Participant

    An example of uneven stations Frame Spacing 1 ft 9 ins
    Yeltalines.jpg

    in reply to: Hull Modelling with stations only #39465
    AvatarRobert Holme
    Participant

    An example of uneven spacing
    STYelta_Linesplan.jpg

    in reply to: Hull Modelling with stations only #39460
    AvatarRobert Holme
    Participant

    Sounds good to me with one proviso…………………..Stations are not always evenly spaced longtitudinally, i.e. the number of frames between station x and station y may not be the same as the number of frames between station a and station b.

    It is usual to have more stations at the extremities, (bow and stern), where hull shape changes are more pronounced than midships where hull shape between frames is very similar, if not the same with high block coefficients.

    HTH Maryak

    in reply to: Hull Modelling with stations only #39458
    AvatarRobert Holme
    Participant

    Yes provided you know the stations, (transversals), locations along the keel line and vertically up from the baseline.

    HTH
    Regards Maryak

    in reply to: Tutorial for bow stern / modelling #39410
    AvatarRobert Holme
    Participant

    Hi Tim,

    Yes its hard to get your head around the bow and stern of 18th/19th century wooden ships.

    Attached is a model of HMS Beagle. Note the use of layers to give control to visibility and hydrostatic calculation.

    HTH
    Maryak

    Attachments:
    in reply to: Cyrillic letters on some windows #39393
    AvatarRobert Holme
    Participant

    Check the settings in your locale. The mix of Cyrillic and western characters is most likely due to to non-unicode characters being presented as western if your locale is not Russia (Россия).

    Regards Maryak

    in reply to: About tables of offsets and flat bottoms #39351
    AvatarRobert Holme
    Participant

    Sorry about that
    Quick and dirty flat bottom

    GPVflat.jpg

    in reply to: About tables of offsets and flat bottoms #39348
    AvatarRobert Holme
    Participant

    Add extra points at the Z axis along the y axes and make a sub grid of the area where the hull is flat bottomed.

    HTH
    Maryak

    in reply to: Looking for historical hulls #39317
    AvatarRobert Holme
    Participant

    The Greenwich Maritime Museum is a good starting point.

    in reply to: IGES export #39240
    AvatarRobert Holme
    Participant

    AFAIK the free version no longer supports the IGES format. i.e. you need to export to another format and use a 3rd party for IGES; or buy the professional version.

    HTH Maryak

    in reply to: Need a screw? #39221
    AvatarRobert Holme
    Participant

    The blade count has an effect on Underwater Noise i.e. the idea being to reduce pulsation between each blade and thus the amount of noise generated, particularly at low propeller revolutions as this usually when a submarine is at its most stealthy and is harder to hear coming or going.
    The requirements to keep the reactor cooled in Nuclear boats means they generate more noise than a battery powered (Conventional) boat. The latest French design is a pulse system where the propeller is inside the hull and draws water in and out through a duct. Cavitation and accoustics are theoretically reduced compared to a conventional external propeller.
    HTH
    Regards Maryak

    in reply to: Need a screw? #39209
    AvatarRobert Holme
    Participant

    BZ Icare.

    My method has been to draw a screw in CAD, export as VMRL1 file.
    Import into DS and save as part.

    3BProp.jpg

    YeltaProp.jpg

    DDGPropMOD.jpg

    HTH
    Regards Maryak

    in reply to: How to open a Freeship .fbm file? #39170
    AvatarRobert Holme
    Participant

    Download a copy of Freeship and open the file you received
    Export the Freeship file as a part file.
    Start a new empty Delftship file with the same LBD units as the Freeship part.
    Import the Freeship part file into your newly created Delftship file.

    HTH Maryak

    in reply to: Cross sections & visible grid #39109
    AvatarRobert Holme
    Participant

    Hi Iosif,
    Attached is modified fbm with layer close hull removed, stations buttocks and waterlines added, mid point set at 1 metre and transom closed in layer strake 1.
    I don’t see the need for 2 layers in such a simple design.

    Regards Maryak

Viewing 15 posts - 1 through 15 (of 179 total)