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The Ideal Rescue Boat

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Matt Jackson View Drop Down
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Post Options Post Options   Quote Matt Jackson Quote  Post ReplyReply Direct Link To This Post Topic: The Ideal Rescue Boat
    Posted: 19 Sep 06 at 12:47pm
Whoa guys. Rupert - I'm fairly sure that when Phat Bouy writes 'you' he doesn't mean you personally and a panacea is more of a cure than excuse.
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allanorton View Drop Down
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Post Options Post Options   Quote allanorton Quote  Post ReplyReply Direct Link To This Post Posted: 19 Sep 06 at 3:32pm

Originally posted by Phat Bouy


An average prop is 3 bladed and revolves at approx 1000rpm at tick over. Therefore 1 blade will hack into you approximately (3000/60) 50 times a minute. Force = Mass x Acceleration. Take the speed up to 5000rpm (250 hits a minute) That is what I teach on all of my PB courses

good job you don't teach them physics!

surely a 3 bladed prop roataing at 1000 revolutions-per-minute will hit you 3000 times?!

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Ian99 View Drop Down
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Post Options Post Options   Quote Ian99 Quote  Post ReplyReply Direct Link To This Post Posted: 19 Sep 06 at 4:46pm
Also, there's a 2.5:1 gearbox on the average 60hp so at an idle speed of 1000rpm for the engine, the prop is only doing 400rpm. Not that it really makes much difference ... either way there's a sharp metal object rotating at fairly high speed which is going to do a fair bit of damage!
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michel View Drop Down
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Post Options Post Options   Quote michel Quote  Post ReplyReply Direct Link To This Post Posted: 30 Sep 06 at 9:08pm

searching the web for opinions of types of ribs prefered as safety boats, and came across this forum. Am getting the impression that  size matters(engine and boat length) to be able to respond to an incident quickly. I suspect,and hope,that posts recommending small engines have come from persons who operate in relatively calm waters.

would like to hear opinions on kitting out a safety rib.First Aid kit,knife,flares, 'thermal blankets' taken for granted.

 Am more interested in positioning of grab handles,on tube,on console.Is an 'A' frame a preffered option.

Throttle controls.Should they be left or right handed,and the angle can vary so much,no good for small people with short arms.

And while on short people,got to mention the delicate matter of seat height for short males.bouncing about in heavy seas can hurt,RIB designers take note.

Radio position,and more importantly speaker position and VOLUME.Very irritating to have to keep backing off the power to communicate.

Boat design.Ribs with raised bow profile tend to be a lot drier in heavy seas.Dry safety boat crews are, I suspect ,more content than the wet variety.

On another subject... have done a fair amount of towing on a line and quite regularly have had to explain to people NOT to tie off on both ends of the tow line...common sense i would have thought...... any comments

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49erGBR735HSC View Drop Down
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Post Options Post Options   Quote 49erGBR735HSC Quote  Post ReplyReply Direct Link To This Post Posted: 30 Sep 06 at 9:29pm

I prefer throttle positioning on the left hand side of the console due to the fact that I've been well taught and feel that it's safest to operate powerboats one hand on the throtle and one on the steering wheel. I feel more in control with my right hand steering, hence this preference. On another note, I've worked with Powerboat instructors, previously employed by the Navy and they never sat down at the consoles on the boats and instead had a well balanced upright stance. The reason for this is through their experience, after prolonged work on ribs, sitting at the console caused back problems, especially slamming through waves. When you are sitting down at the console, the base of your spine absorbs most of your bodies energy whilst the boat bounces over waves. By standing up, the energy is less concentrated and is divided up through the whole of your back, legs, etc. For the crew of a rib, sitting down on the inflatable sides of the rib, the slamming effect on the base of the spine has low consequence due to the fact that the inflatable tanks absorb more energy than a console seat.

Dennis Watson 49er GBR735
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CurlyBen View Drop Down
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Post Options Post Options   Quote CurlyBen Quote  Post ReplyReply Direct Link To This Post Posted: 30 Sep 06 at 10:27pm
Another vote for throttle on the left, again I much prefer having full control of steering and power, and some boats (especially if the trim anode's been knocked) are hard to turn at speed with power. I tend to stand if the boat's really slamming, if you keep your knees slightly bent it's much more comfortable going through the waves, and I prefer an A frame - might just be psychological but I don't like relying on the steering wheel to stop me flying forward! While there's definitely an argument for bigger ribs, they can be too big and then get very difficult to manouevre close to a dinghy. Spare shackles can be useful - can make the difference between a tow or sailing back, and bits of rope and pliers are useful too. With radios the ones I've used have had speakers in the handset which can be easier to hear, but proper shielding from the engine electrics makes a big difference to how other people can hear you. 
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Ian99 View Drop Down
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Post Options Post Options   Quote Ian99 Quote  Post ReplyReply Direct Link To This Post Posted: 01 Oct 06 at 12:37am

I'll be different and put my vote for throttle on the right hand side, simply because you can get away with letting go of the throttle for short periods to use the radio, clean your glasses etc. which is suprisingly difficult to do with your left hand (if you're right handed).

As far as the main task of operating the boat is concerned, I find it doesn't really make any difference, and perhaps suprisingly, I don't even notice when swapping between boats which have it on opposite ways round!

With towing, the thing I never understand is the way people don't use the full length of the tow rope you've thrown them and then wonder why their boat ends up in the back of the engine - in a big sea 100 feet of rope can be too short in some cases!

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Post Options Post Options   Quote m_liddell Quote  Post ReplyReply Direct Link To This Post Posted: 01 Oct 06 at 2:56pm

A throw line from the front of the boat is useful for quick lee shore rescues. I also stand a bit when in waves, a rib I used once had foot loops!

BTW another vote for throttle on the right. It just feels more natural for some reason even though I learned with it on the left.



Edited by m_liddell
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Windspirit1333 View Drop Down
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Post Options Post Options   Quote Windspirit1333 Quote  Post ReplyReply Direct Link To This Post Posted: 01 Oct 06 at 3:39pm

It depends on what you need the rescue boat for really!

On our Inland lake back at home a 4m searider with a 15 on the back would be more than enough (but then the lake is tiny!)

At the outdoor centre i worked at (on the south coast) we had 4m seariders with 25s on the back no prop guard as we are all from the school as as soon as you get near kill the engine!! although the size was great for doing training/safety around picos and 2000's the engine size could have been bigger as its a little difficult towing against tide with 6 x 2000's in tow behind you!! Also out of the harbour with big waves the rib size did make you feel a little dwarfed!

but even then with 25's there were okay, my only gripe was the jeannaus with the 15's on the back! evil little things with no electronic trim so useless in a tidal harbour full of mud

However I work for a Harbour Authority nearby and we run a 5.85m with a 75 on the back... which is great for what we need it for, mostly towing and the occasional rescue (though a slightly bigger engine would be cool to chase those pesky jetskis) but for towing dinghys its fine and you can easy rest a rack over the sponson and tow alongside without it being too bulky! the turning circle is nice too not too wide to make it annoying to drive (though the A frame on the back is useless as we've snapped it off twice) (but then again we have a larger displacement craft for when grunt is needed!)  I find the size is great if you do need to be out of the harbour entrance in the big stuff and the engine is powerful enough so you can get to people in a safety capacity quicky!

i think its all depends on the true use of your boat for the set up really... i've driven throttle left and right and find both as easy as each other... but having the VHF on the console right by you makes it so much easier to hear and i've found the depthsounder (in coastal areas) and GPS invaluable! Also having throw lines on the bow and either side of the A-frame is rear mounted makes it super helpful!

just realised how long this post is!  hope its of some help!



Edited by Windspirit1333
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michel View Drop Down
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Post Options Post Options   Quote michel Quote  Post ReplyReply Direct Link To This Post Posted: 01 Oct 06 at 11:49pm

Well pleased to find five return posts within twentyfour hours.There are few regular safety boat drivers in my patch of water ,so its good to get this sort of feedback.

Thanks 49er for info on standing not sitting.I have to agree.I never sit unless stationary.Standing with bent knees  is well advised.Sitting on sponsons may absorb jarring ,but its also difficult to hang on in the rough.

 I drive two completely different RIBS. One has the centre seat tight up to the console.This means permantly standing astride the seat.The seat is too high and wide too allow any knee flexing.It also requires this short legged driver wears supportive underwear  in rough seas!         The other RIB fitted out by an experienced driver is set back from the console allowing the driver to sit, or to stand freely with flexed knees...so much better.

Like you Ian99 I drive RIBS which have opposite throttles. Despite being right handed I have no preference.Wearing prescription glasses is such a pain isnt it(cant wear contacts) Any advice?

where on the boat curly ben, is your A frame?!                                        Spare shackles......absolutely, and spare ground tackle, as just occasionally anchor has been laid without attaching buoy !

 windspirit  I admit to breaking just about everything......but 'A'frames!!!!   We have upgraded to 75hp's and wouldnt be without them now.  Agree that radio needs to be up on the console.We have one placed at knee height to protect it from the weather ! Daft place for the speake,r and frequently knock channel dial with my knee.       

Towing points on RIBS? On the 'A' frame?(windspirit!)Off the console seat?Off the transom?Hold between teeth?

 

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