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Old 14 July 2006, 08:01   #11
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as Captin , your first resposability is your crew, parts well thay are lower on the list, sounds like you are doin better than you think.

thare are some places whare you can buy an outboard of any year made
NEW, of any model from any maker, not only new, but better than new,
as in a SuperOutboard of any model ever made.
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Old 14 July 2006, 08:02   #12
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Quote:
Originally Posted by Andy_Rs600
If the boat jumps, and you come off the throttle, the bow will land much more heavily than if you leave the power on. Thus it's a balance of risk to impellor vs risk to passengers.
If you're just bumping along that's fine, but it's not a good technique when things get a bit more serious -- you'll just end up landing the boat on its transom which isn't good for you, the boat or your passengers!

The knack is backing off the throttle to stop the boat launching itself off the top of the wave, then getting back on the throttle to keep the bow up for the next wave. It takes some practise, but feels great when you get it right.

John
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Old 14 July 2006, 08:32   #13
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Quote:
Originally Posted by Andy_Rs600
it's a balance of risk to impellor vs risk to passengers.
wiv yew dryvin de bote bowf passinjers an impeller arr fukt. sownds lyke yew nead sum dryvin lessuns

Quote:
Originally Posted by Andy_Rs600
I drive 4.6m RIBs at work almost every day
i thort yew waz wan ov dem parrermedik nobburs. spil de beens yew ratfink.


gaRf
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Old 14 July 2006, 09:41   #14
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so you take off the power as the boat flies off the wave-and it lands like a ton of bricks.
Leave the power on and you glance off the surface on landing and no-one gets hurt. Also keeps exhaust pressure in the leg and stops water swilling upto the powerhead on landing which is nice - particularly with a two stroke. Never had a problem with the lower unit or any other bit for that matter from landings-but I have acccompanied a crew member from a certain very official patrol rib to hospital after the helm throttled back in mid air , the boat landed dead and heavy and the crewman cracked a few vertebrae. New engine bits are far easier to find than new backbones. Of course the easy way is not to take off in the first place or even dont go out in a boat
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Old 14 July 2006, 10:08   #15
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are we saying then never to throttle back at all when doing a reasonable jump

or

is it ok to back off the throttle slightly as you leave the water on a jump and have had all the thrust from the engine already, while in mid air throttle is eased back to stop the engine screaming too much but still backpressure in exhaust, then apply the throttle for when you land as the leg hits the water to keep forward momentum

what are we saying is best here?

i know what i do on a motorbike just interested to hear what folks think with a rib
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Old 14 July 2006, 10:25   #16
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My gut feeling is during normal conditions keep the power on. Having no power on when you land makes the boat stop dead. Its crew doesn't stop dead though, thats when it gets nasty.

Having said that if you can find a nice big roller where you can fly off better than Eddie the Eagle then I suppose it might be time let the power off slightly. I suggest these conditions are quite hard to find.
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Old 14 July 2006, 10:27   #17
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RIBase
Quote:
Originally Posted by The Garfish
i thort yew waz wan ov dem parrermedik nobburs. spil de beens yew ratfink.
Yep, but i worked as chief instructor at a sailing club until very recently!

Quote:
Originally Posted by John K
The knack is backing off the throttle to stop the boat launching itself off the top of the wave, then getting back on the throttle to keep the bow up for the next wave
Agree competely, but the time to back off is BEFORE the boat leaves the water like wavelength said. However, if you do jump the boat, through driving too fast, not reading the wave pattern correctly, or intentionally, if you come off the power you are in for a rough landing. Once the prop is out of the water, throttling back isn't going to affect the flight of the boat at all, only the landing.

When the prop re-enters the water, if it's at low RPM the leg will act as a brake. Because this prop centre of resistance/effort is below the centre of mass of the boat the bow will drop, and the boat lands flat, or even bow down, resulting in a hard landing or a full on stuff if you're going down-wave.

Conversley, power on in flight and when the prop re-enter it drives forward, and rotates the bow up, giving a nice soft landing.

Obvioulsy the best way is not to take off in the first place!!!
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Old 14 July 2006, 10:37   #18
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Quote:
Obvioulsy the best way is not to take off in the first place!!!
but it is fun isnt it-provided no-one gets hurt . All crew instructed not to take the shock on the base of their spine but on bent legs lifting one's backside of the seat and to read the sea in front of them so it doesnt come as as surprise when they find the boat is airborne. Also to watch they dont headbutt the structures in front of them if the helm cocks it up and the boat stops dead. Running with the sea, trimmed up and some air under the boat-best feeling ever.
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Old 14 July 2006, 11:07   #19
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Great Info! I'll have more issues in November with waves than during the summer. I would assume the E-tec 60 hp has a rev limiter?
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Old 14 July 2006, 12:32   #20
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going back to the original question - flush it out after its been in salt water, and use the thing. Most engines on boats get sick cos they're not used enough. Best form of maintenance is running it-and its a lot more fun than having it sitting around anyway
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