Home > Development, Flight Simulation, Flightsim, FSX > The funny issues that come up when modelling the world

The funny issues that come up when modelling the world

Sunday, April 22nd, 2007

Here’s an odd one: our newly constructed model of the Lion’s Gate Bridge accurately represents the real-world clearance of 200 feet (61 metres), per the Engineering drawings.  (See also this reference.)  The published height of the Island Princess (cruise ship kindly provided by Mitsuya ‘Hama’ Hamaguchi) is 204 feet (62 metres).  So how does the ship get to and from the Vancouver terminal?  I’m guessing, like US Navy carriers, it can only transit First Narrows at low tide.  So how do we represent this in the sim, which shows mean sea level?  Right now the top of the superstructure collides with the bridge!

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  1. Bob
    Sunday, April 22nd, 2007 at 9:53 pm

    Hi Jon,

    Looks like you might have to “cheat” and raise the bridge by an amount equivalent to the low tide that is experienced there.

    Or get Holger to change all the shorelines to low tide.

    Bob

  2. Frank Grindel
    Monday, April 23rd, 2007 at 4:50 am

    Hi Jon,

    The ship has a 27 foot draft which means there is 27 feet of ship below the waterline of the ship. 204 – 27 = 177 feet above the waterline.
    Or you could let some air out of the tires! 😉

    Frank

  3. Monday, April 23rd, 2007 at 6:44 am

    Holger adds that he believes that some ships have antennae on hinges that can be pulled out of the way. Frank I believe when they state “height” it’s above waterline, but that would sure be a nice solution!

  4. Frank Grindel
    Monday, April 23rd, 2007 at 9:05 am

    Hi Jon,

    The ship height is normally measured from keel to funnel which would include the draft but not the antennae which Holger rightly mentions. I think if you book in steerage you are required to assist in cranking those antennae when the time comes. 😉

    Frank

  5. Ian
    Tuesday, April 24th, 2007 at 12:17 am

    Hi Jon,
    can’t you put something heavy in the boat so that it lies deeper in the water?

    On a general note, you should be getting sponsor money from the Vancouver Tourist Board. I’ve never been there, but your screenshots have convinced me to add it to my list of places I should go and see (assuming the real thing looks as good as the simulation).

    Ian

  6. Tuesday, April 24th, 2007 at 7:23 am

    LOL, guys. Frank, I’ll have to look into that height definition more closely, I’d found some info that indicated the “height” was used to define bridge clearance.

    Indeed, Ian, the real thing comes very close to the simulation. 😉

  7. Tuesday, April 24th, 2007 at 7:38 am

    Alrighty, I spoke to Princess Cruise Lines, and their Ship Inventory department reports that 203 feet is the height from waterline to funnel top. That means, the ship must only transit at low tide. We could consider having the ship ride lower in the water to avoid the collision….

  8. Frank Grindel
    Tuesday, April 24th, 2007 at 3:24 pm

    Hi Jon,

    I think if you just pack a few more Yank tourists aboard it will lower that waterline. But seriously, just a simple cfg file change to the reference_datum_position should solve the problem.

    Frank

  9. Thursday, May 3rd, 2007 at 8:42 pm

    That fix worked fine, Frank, thanks!. But we haven’t checked out the impact on contacts points/effects as yet.

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