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Old 03 August 2005, 12:43   #11
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Engine Trim is the lower part of the tilt mechanism.
If you use the Trim/Tilt switch you notice it is 2 speed. The slower (close to virtical) is trim used to trim engine/boat. The faster is Tilt used to Tilt engine prior to beaching/recovering.

Trust this helps

Brian
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Old 03 August 2005, 17:01   #12
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Quote:
Originally Posted by Tight Fart
Now is this me doing something wrong, the basic design of the RIB not liking any swell or what? I have only noticed this when it's only me in it and am unsure if it could be down to weight, but as the family won't go out at any sign of a wave it's hard to check.
If you heading into a 3 foot swell in a 4,5m rib at 20 knots then it is going to go airborne big time. How it lands can depend on the torque from the prop, balance of the boat and the distribution of weight in the boat, offset of the engine and the angle of the wave to name a few.

I suggest you keep the engine trimmed in going into the waves and trimmed out going with the waves but also dip the revs as you touch the wave so the boat floats over the wave not fly off the top. Power can go back on almost instantly to keep the momentum going.

Pete
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Old 04 August 2005, 03:38   #13
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Thanks for all the replies, I have a lot to learn and I think some tuition is in order. I have never noticed 2 speed in the tilt action and will have a look at the weekend, The throttle response would not allow me to adjust engine speeds over the rise of a wave.
So tilt and trim are the same thing (ish) Tilt lifts the engine out and trim is a finer adjustment off engine angle?
I know it's going to get air bourne but I thought it should pretty much glide over a small swell at 20 knots. Its the way it takes off and lands that's scary.
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Old 04 August 2005, 04:07   #14
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Quote:
Originally Posted by Tight Fart
Thanks for all the replies, I have a lot to learn and I think some tuition is in order. I have never noticed 2 speed in the tilt action and will have a look at the weekend, The throttle response would not allow me to adjust engine speeds over the rise of a wave.
So tilt and trim are the same thing (ish) Tilt lifts the engine out and trim is a finer adjustment off engine angle?
I know it's going to get air bourne but I thought it should pretty much glide over a small swell at 20 knots. Its the way it takes off and lands that's scary.
Hi Mate,

If the throttle response won't let you adjust speed over the wave then you might be over propped.
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Old 04 August 2005, 05:11   #15
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Hi TF,

I think you just need a little bit more experience with your boat in differering sea states (no offence meant - just my tuppence worth). I have a wee 4 metre boat with a 40 hp on the back - flat out speed is 31 knots on gps (flat calm, solo, fully trimmed out), so our rigs are similar. Any wave action reduces that performance considerably - not that the boat isn't capable - its a matter of comfort and safety. In the type of swell you mention (3ft) I am probably doing just over 20 knots, but backing off just before cresting the wave, then power on again to drive down and up the next one. It ends up being a very smooth rolling action - and keeps airtime and slamming to a minimum. I nornally keep the motor trimmed in in anything other than a flat calm - in my wee boat it doesnt make that much difference except in flat calms. The boat behaves well like this, and my ears are saved the verbal abuse from the missus sitting on the pillion! The frequency of the swell (space between waves) is also critical, as closer, steeper waves are not as easy as longer, spaced out ones. Having said all this, I don't get it right all the time, and sometimes get caught out by a wave, and find myself airborne big time, complete with big slam back down. It isn't comfortable, sometimes the boat gets a bit skew-whiff too - the solution is in your throttle hand - ease off a bit! Like I said at the top - I think you just need to get more used to handling your own rig in different conditions. I have also tried doel fins on my outboard, but found the boat behaved better without them, so took them back off.
Of course every now and then I get to pretend I'm young again, and I'll blat round flat out jumping every wave in sight. You still need to exercise throttle control just before takeoff, or the boat lands every which way. This generally doesn't last too long 'cos its tiring and I eventually scare myself too much on a bad landing, so the red mist clears and I back off a bit again. Just enjoy what you have, and as you get more in tune with your own rig you will find your own limits and be confident within them.

Bill
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