Motion sickness

This was interesting [to me anyway]:

KATE, the Duchess of Cambridge’s ‘moody’ demeanour during the horse-drawn carriage ride at Trooping the Colour has finally been explained. Kate was suffering from motion sickness from the swaying of the vintage coach, according to the Sunday Mirror.

The Duchess progressed up the Mall with Prince Harry, Meghan Markle and the Duchess of Cornwall. However Kate, who decided to use a car for her wedding in 2011, has an unlikely sympathiser within the royal family.

The Queen of course, who dislikes the hard suspension of the carriage.

The Queen reportedly suffers from seasickness too despite the fact she sailed in the Royal Yacht Britannia for 43 years. She reportedly recommended her favourite pills to Kate for the occasion.

Dr Qadeer Arshad from Imperial College London said: “Motion sickness is down to mixed messages coming from your ears and eyes.

[Qadeer Arshad, Qadeer Arshad – French, is it?]

He said: ”We’ve developed a technique using electricity to stimulate parts of the brain to ease symptoms.”

Bells, flags – Manchurians, strapped into chairs, the chips in Wills’s and Hal’s wrists. Raymond Shaw.

Yes. Wiki quotes one theory as to what causes it:

[C]ontemporary sensory conflict theory, refer[s] to “a discontinuity between either visual, proprioceptive, and somatosensory input, or semicircular canal and otolith input”, is probably the most thoroughly studied. 

According to this theory, when the brain presents the mind with two incongruous states of motion; the result is often nausea and other symptoms of disorientation known as motion sickness.

Shifting this to boats, most boats at sea have ‘rocker’, or the banana shape which fits them to the wave much better than a long tube does.

The ideal is to dampen the effects of:

#  Pitching, where the boat dips forward and back like a rocking horse;
#  Rolling, or side to side motion;
#  Yawing, where the boat wants to pivot on its deep keel centrifugally;
#  Slamming, where straight bottom creates a slamming effect on the waves;
#  Nosediving, which is self-explanatory.

Boat design involves ameliorating as many as you can – V shape for softness, length – the longer the better, rocker, all motion a compromise. I build straightline tracking in mine, which helps with yawing, rolling and pitching, while still being susceptible to slamming – so the latter is ameliorated by a softer V in the undershape.

Plus my boats are notoriously difficult to put about or turn around through the eye of the wind – I’ll trade that ability for straightline sureness of tracking please.

The way we used to do it on the cats was to wait for a wave crest, bows out of the water, then turn.

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2 comments for “Motion sickness

  1. microdave
    June 17, 2019 at 14:09

    I rarely travel on water (at least rough water, anyway), but the worse seasickness I remember was during a trip out to the Barrier Reef in ’84. It was in a largish aluminium hulled catamaran (twin Detroit V12 diesels IIRC) and the biggest problem was the diagonal motion when crossing the swell. Sitting below decks was a total no-no, so I went on deck, and did my best “Bus Conductor” emulation to keep as upright as I could. Once the brain had comparable information from ears and eyes (the horizon, as a reference) it wasn’t too bad.

  2. Distant Relative
    June 17, 2019 at 16:47

    Must be why Camilla looked like she was sucking a wasp during that carriage ride too.

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