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Old 20 January 2013, 13:00   #11
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You surprise me poly ... As our stats and bean counter guru I thought you would have worked out the pitch,leg ratio and rpm by now
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Old 20 January 2013, 13:47   #12
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You surprise me poly ... As our stats and bean counter guru I thought you would have worked out the pitch,leg ratio and rpm by now
I don't think we have enough information to do that!

If you assume the casualty was stationary at the time and the boat was moving, then I guess you can estimate the pitch - but you'd need to know if it was a 3/4 blade prop or I think you get a 25-33% error. You then need to consider whether a solid object hit by a moving prop gets thrust and therefore is no longer stationary... ...I did wonder if this is the effect that MC described as the skipper slowing the throttle - which changes the period of the injuries...
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Old 20 January 2013, 15:49   #13
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I don't think we have enough information to do that!

If you assume the casualty was stationary at the time and the boat was moving, then I guess you can estimate the pitch - but you'd need to know if it was a 3/4 blade prop or I think you get a 25-33% error. You then need to consider whether a solid object hit by a moving prop gets thrust and therefore is no longer stationary... ...I did wonder if this is the effect that MC described as the skipper slowing the throttle - which changes the period of the injuries...
Class .... I knew you wouldnt let that one pass without some possible analysis .. excellent !

I just hope the gentleman made a daycent recovery ... bet it put his lumbago into miniscule focus
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Old 20 January 2013, 16:04   #14
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I don't think we have enough information to do that!

If you assume the casualty was stationary at the time and the boat was moving, then I guess you can estimate the pitch - but you'd need to know if it was a 3/4 blade prop or I think you get a 25-33% error. You then need to consider whether a solid object hit by a moving prop gets thrust and therefore is no longer stationary... ...I did wonder if this is the effect that MC described as the skipper slowing the throttle - which changes the period of the injuries...
If you ever change your avatar Polwart... then make sure it this one!
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Old 20 January 2013, 18:50   #15
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A recent pic on our FB page, prop damage, sorry if your a bit Squeamish

Peter @ Boatsandoutboards4sale ~ www.BoatsandOutboards4Sale.co.uk ~ 07930 421007
OMG !!! Is that genuine??? Do we have any details? Who what where when? WOW for all the wrong reasons..
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Old 21 January 2013, 03:28   #16
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Genuine yes, no further details known.

Peter @ Boatsandoutboards4sale ~ www.BoatsandOutboards4Sale.co.uk ~ 07930 421007
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Old 21 January 2013, 04:52   #17
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sad loss of Kirsty MacColl in boating accident....





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Old 21 January 2013, 05:28   #18
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A couple of years ago we were competing in an offshore powerboat race in a hardboat. The race was into Newcastle (Australia) Harbour with a tight 180 degree turn and then back out into the ocean. We decided that if we could be fast around this turn we could gain some time.

The solution we decided on was to fibreglass in some aluminium angles under the hull, one each side so the boat would corner as if on rails. And it did. It worked brilliantly. Too brilliantly.

On one turn we were powering through the turn very fast when suddenly we slid out and were impersonating a helicopter rotor heading towards the wharf that held most of the spectators. The boat settled, we didn't hit anything solid and we regained our composure continuing the race.

Once out in deep water at a great rate of knots my feet felt wet and as Alex was steering I crawled under the forward deck to investigate if the ballast tank was leaking.

The good news is that the ballast tank wasn't leaking. The not so good news was that there was a hole in the boat where the speed rail was previously attached to about 5com wide and 30cm long. A quick trim adjustment kept the boat out of the water enough to not only get us home but finish the race with a third place.

I will look for a photo of the boat airborne during the race with the hole visible. Hopefully I can get the old computer going.

This was the same race that had to be restarted because a race boat unexpectedly turned hard right onto another race boat, going straight over its transom and severing the engine front the boat. Only the gear and throttle cables held it on. As the electric fuel pump was still on, a fire erupted and the boat burnt to the waterline.

This was our last offshore boat race.
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Old 21 January 2013, 05:30   #19
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If you ever change your avatar Polwart... then make sure it this one!
No no ... Well he's already had this one
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Old 21 January 2013, 05:32   #20
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But I submit this one might be more accurate
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