John949

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  • in reply to: Mirror & Hydrostatics #44969
    John949
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    Yes the bulb had leak points (doesn’t have them when set to symmetrical but they appear when I mirror it!)  The mirror command is definitely not working properly for a fin keel, see attached.  The LHS is what I drew, the RHS is what mirror produces.  The bottom is worse as the mirrored section doesn’t even reach the bottom.  BTW leak points are on and there aren’t any but still no hydro.

    I have also hit a major snag trying to calculate heeled CLR.  The program calculates the CLR for the unheeled profile (i.e. the CLR for the centre line of my model)  Whereas it should use the the vertical projection of the heeled model.  You can demonstrate this by moving points off the centre line – they have no effect on the calculated CLR, even though the side view is visibly changed below the waterline.  If you change a point on the centre line, CLR changes – even if it does not affect the visible profile.  I guess I’m going to have to resort to Simpsons Rule!

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    in reply to: Mirror & Hydrostatics #44967
    John949
    Participant

    Tried that, no good.  Hydro still fails if I enable it for the any of the fin, rudder and bulb.  More worryingly the calculation for CLR doesn’t seem to work properly once the model is heeled.  If I make a significant change to the profile (e.g. increase the under water area at either end) the CLR calculation returns an unchanged value.  It does what I expect with a symmetrical model but not once it has been rotated.  LCB seems to work okay thought.

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