Robert Holme

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Viewing 14 posts - 166 through 179 (of 179 total)
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  • in reply to: Counter Stern #37155
    AvatarRobert Holme
    Participant

    My effort so far???

    Considerably different from yours!

    Oh please don’t take this the wrong way but the deck is above the rubbing strake i.e. 12 inches higher than your current location. Says he who can’t even get a deck into his model!!

    Best Regards
    Bob

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    in reply to: Counter Stern #37154
    AvatarRobert Holme
    Participant

    Jurgen, that’s just brilliant!!!!

    1st Question, there are many less control lines on your model, how did/do you extend the surfaces without taking the control lines with them? (I mean the red ones).

    Best Regards
    Bob

    in reply to: Midwater Longliners – Fishing Vessel #37145
    AvatarRobert Holme
    Participant

    Hi Jurgen,

    Don’t be sorry, it’s good practice for me with my adopted 2nd Language.

    Thanks to you I have made a deal of progress with Yelta. I’m slowly coming to grips with the way delftship handles layers, extrusions and faces. Interior edges had me for a while but now I see how to use it to fair the hull and in a few more days, (between honey do’s), I hope to offer something for you to critique.

    in reply to: Midwater Longliners – Fishing Vessel #37143
    AvatarRobert Holme
    Participant

    Hi Jurgen,

    My wife is Russian hence my use of snippets of it.

    All that you have said about keel cooling is correct and my term of tubes was misleading. What is actually done is the keel box is baffled similar to the attached jpg.

    Another form, is to weld half sections of say 100mm tube to the outside of the hull such as to form a grid on the hull as a heat exchanger.

    I personally see many more disadvantages with this system than advantages. The 1st which comes to mind is grounding!!

    Best Regards
    Bob

    Attachments:
    in reply to: Midwater Longliners – Fishing Vessel #37140
    AvatarRobert Holme
    Participant

    Oops, forgot to say that the design of the keel above would suggest that this vessel uses keel cooling as a means of heat exchange for the main engine. i.e. instead of having a tube type heat exchanger fitted in the engine room and supplied with a seawater pump, the engines fresh water pump supplies tubes fitted in the keel and the vessels motion provides the heat exchange. This means one less pump to be powered and maintained. This is very common in Australian trawlers.

    Best Regards
    Bob

    in reply to: Midwater Longliners – Fishing Vessel #37139
    AvatarRobert Holme
    Participant

    Hi,

    Your description of “Keilfall” leads me to believe the English term is Trim which can be by the bow or by the stern. The Delftship manual has a full explanation.

    Hope this helps

    Best Regards
    Bob

    in reply to: Counter Stern #37113
    AvatarRobert Holme
    Participant

    Hi Jurgen,

    Thank you once again for your invaluable help. I have downloaded your tutorial and the ship file now I’m off to practice and learn some more…………….who said you can’t teach an old sea dog, (Старый морской волк), new tricks?

    And not only that you are a poet of distinction. Move over Chekov.

    Kindest Regards
    Bob

    in reply to: Counter Stern #37110
    AvatarRobert Holme
    Participant

    Attached is my file of Yelta

    Still haven’t sorted out the stern and aperture 4 days of failure. There is something I’m not grasping yet, the penny has not dropped!!

    I went through a similar period with 3D CAD but finally the penny dropped as to where the Z axis is and now I would not design any other way. I’m hoping for something similar here so if anyone can give my penny a push………… Wonderful.

    Jurgen has been a big help………..I would not have got this far without this.

    Attachments:
    in reply to: Counter Stern #37094
    AvatarRobert Holme
    Participant

    Hi Jurgen,

    Having had a more in depth look at your PDF, as well as my earlier comment about the aperture, below is why I think you feel the proportions are wrong. I know I don’t really know but here is what I believe:

    The vessel is trimmed such that the drafts are as follows:

    Draft at frame 54 which is taken from the keel base at frame 48 = 8.926 ft
    Draft at frame 27, (Midships), is 10.253 ft again from the keel base.
    Draft at frame 0 is 11.984 ft.

    The vessel has a bar keel and stem post which is 6″ deep below the frames and 6″ forward of the stem post. The hull plates are 3/8″ and overlap and are riveted to the keel
    The stern post casting tapers at the bottom from 3″ to 1″ to match the keel at its’ forward end.

    Attached are some slipped photos.Best Regards
    Bob

    in reply to: Counter Stern #37091
    AvatarRobert Holme
    Participant

    Hi Jurgen,

    Having had a more in depth look at your PDF, as well as my earlier comment about the aperture, below is why I think you feel the proportions are wrong. I know I don’t really know but here is what I believe:

    The vessel is trimmed such that the drafts are as follows:

    Draft at frame 54 which is taken from the keel base at frame 48 = 8.926 ft
    Draft at frame 27, (Midships), is 10.253 ft again from the keel base.
    Draft at frame 0 is 11.984 ft.

    The vessel has a bar keel and stem post which is 6″ deep below the frames and 6″ forward of the stem post. The hull plates are 3/8″ and overlap and are riveted to the keel
    The stern post casting tapers at the bottom from 3″ to 1-3/4″ and is butt strapped and riveted to the keel at its’ forward end.

    Attached are some slipped photos.Best Regards
    Bob

    in reply to: Counter Stern #37088
    AvatarRobert Holme
    Participant

    Hi Jurgen,

    Wow………………That was quick.

    Whats wrong…………not much………….the propeller aperture has no sharp corners.

    Now I will study your pdf and try to emulate what you have done and not take up any more of your time.

    One virtual Fosters duly served………….

    Best Regards
    Bob

    in reply to: Counter Stern #37078
    AvatarRobert Holme
    Participant

    Hi Jurgen,

    Thanks again, please whatever you can do will be a big help to me.

    I have attached a file of the body plan which is very close to 1/4 inch per foot scale on an A4 paper in landscape

    Best Regards
    Bob

    Attachments:
    in reply to: Counter Stern #37070
    AvatarRobert Holme
    Participant

    Hi Jurgen,
    Thank you for your continued help and inspiration.
    Yes that which I am calling a transom is very very similar to the fantail you show.
    OK the vessel:
    St Yelta………………….(yelta, aboriginal word from one of their languages meaning sea bird)
    Built by Cockatoo Docks & Engineering Sydney NSW Australia.
    Ship no 192 laid down in 1947 and commissioned for Adelaide Steam ship Co. in 1949.
    Main particulars LOA 102.75 ft
    LBP 94.5 ft
    Beam 25 ft
    Mean Draft 10 ft
    Maximum speed 13 knots at 140 rpm

    Powered by 1000 hp triple expansion steam engine, supplied by 3 furnace Scotch Marine boiler at 200 psig. Was converted from coal to oil in 1957.
    4 blade cast iron propeller 8 ft diameter 11 ft pitch.
    Retired in 1976 and sat idle until taken over by the South Australian Maritime Museum in 1986. Between then and 1996 was restored and transformed, (by mostly volunteers), into a licensed passenger vessel. Now operates school holidays from Port Adelaide cruising passengers up and down the estuary form a 1.5 hr trip, also available for charters.
    Alas all I have to work with is a photocopy of the body plan plus a photocopy of the general arrangement.
    Best Regards
    Bob

    This is as far as I’ve got!

    Attachments:
    in reply to: Counter Stern #37066
    AvatarRobert Holme
    Participant

    Hi Jurgen,

    Thank you for taking the time to respond. I am still very much a learner and as yet I have not fully understood adding points edges curves etc. I managed to delete quite a few, much to my dismay but I will get there.

    I have started my model using LBP and now I think I need to add a box to manipulate the transom overhang from the AP.

    Thanks again
    Bob

Viewing 14 posts - 166 through 179 (of 179 total)