Boat in build pics (2013 Fairline Squadron 78)

[MapisM]

No wonder I never noticed the gyro steer before now!

The NovurYammy job is indeed lovely.
I fully agree with your choice of not bothering to fit a pole.
Btw, also when pulling hard, I'm not sure it would actually improve the ride, because if as you said it should be pretty high, that doesn't help at all with monoski (as opposed to wakeboarding).

 

[MapisM]

to be clearer on this: spinning in different directions wouldn't cancel out each others gyroscopic forces but each would have their one.

Uh? Not clearer at all, from my viewpoint.
A counter-rotating (CW) stbd engine would be the only way to cancel out (I mean, compensate exactly) the gyro effect of the normal (CCW) port engine, assuming that both are spinning at the same RPM, of course. Eeven if each block would generate its own force, obviously.

 

[jfm]

Uh? Not clearer at all, from my viewpoint.
A counter-rotating (CW) stbd engine would be the only way to cancel out (I mean, compensate exactly) the gyro effect of the normal (CCW) port engine, assuming that both are spinning at the same RPM, of course. Eeven if each block would generate its own force, obviously.

+1. As the bow lifts on a wave, one crankshaft would try to turn the boat left, and the other would try to turn it right, perfectly cancelling each other.

 

[jfm]

The NovurYammy job is indeed lovely.
I fully agree with your choice of not bothering to fit a pole.
Btw, also when pulling hard, I'm not sure it would actually improve the ride, because if as you said it should be pretty high, that doesn't help at all with monoski (as opposed to wakeboarding).

Yup. Anyway, i've come round to the view, in my old age MapisM ;D, that a big tender is important. With Match1, I anchored off Formentera and Menorca for example, and spent the day exploring the coast by tender, loaded up with beers, picnic, loads of fuel and a GPS screen. A 4.1 metre was way more use than a 3.2m for this, and I'm hoping this 4.3m boat will be even better. Novu 430 also has a nice deep V hull (pic below) and the extra hp to use this is available the 70Yammy

I don't particularly see the sense in >24m boats but I would love a 5.5m tender w/125hp. I think that means I need to start thinking about trawlers. Eventually you will get to say "I told you so"

 

[rafiki_]

+1. As the bow lifts on a wave, one crankshaft would try to turn the boat left, and the other would try to turn it right, perfectly cancelling each other.

I've lost the will to live on this one. Not an issue for M2 if it wasn't for M1. Now, when this forum collectively decides to design a carbon fibre race boat with twin high rpm gas engines, then some sums will be necessary.

 

[John100156]

Are the light grey patches concealing fixing points for the hydrofoils - with 70 horses on the back, that tender looks like she will fly..... Now with the motor rotating in a CW........

 

[MapisM]

I don't particularly see the sense in >24m boats but I would love a 5.5m tender w/125hp. I think that means I need to start thinking about trawlers. Eventually you will get to say "I told you so"

You meant <24m boats, I suppose? I perfectly see your point, anyway.
But re. "told you so", I don't think it's just a matter of being able to carry around a bigger tender.
Slow cruising is a lifestyle altogether, and any real sea lover is bound to join the club, sooner or later.
Depending also on how much "time poor" anyone is, of course.
Then again, what's the point of being cash rich and time poor...?

 

[MapisM]

when this forum collectively decides to design a carbon fibre race boat with twin high rpm gas engines, then some sums will be necessary.

Now you're talking, shall we start?!

 

[rafiki_]

Now you're talking, shall we start?!

When shall we start

 

[erik_plus8]

Sorry for continuing OT, but iirc, we measured 120 dB in the garage when the car was at idle, 3500rpm. The engine was a 3l, V10 F1 engine, so it's some years ago now. Never measured the noise at higher rpms out on the track...

And to contribute in the gyro discussion, we never considered any effect from the spinning crankshaft (close to 20000rpm), the car turned well in both directions

 

[Kitbag]

Squadron build.

Is the Squadron being built locally to me, I live in Hampshire, I used to work as about builder many years ago. I live and keep my boat in hythe the marina. I would much appreciate a chance to see this wonderful boat in progress. Fingers crossed Kitbag

 

[jfm]

And to contribute in the gyro discussion, we never considered any effect from the spinning crankshaft (close to 20000rpm), the car turned well in both directions

But that's because an F1 car doesn't experience any angular acceleration about an athwartships axis, due to flat circuits (rough cicuits, with peaks and troughs, like Austin say, don't count)

 

[rafiki_]

But that's because an F1 car doesn't experience any angular acceleration about an athwartships axis, due to flat circuits (rough cicuits, with peaks and troughs, like Austin say, don't count)

I'm not aware that this has ever been a problem with engines in cars, even with rally cars yumping in Finland. It can be a problem with wheels/tyres though.......no, not going there again

 

[jfm]

Thanks for not going there again, phew.

 

[vas]

!

JFM and co,

nice discussion, how about getting back to track please
[from what I can understand the forces introduced by a wee crank (what 20kg?) in relation to the boat weight (say 20ton?) are not worth the electrons wasted - all imho of course! ]

have a happy new year, regards from beautiful Istanbul!
(yeah, found a decent connection and some peace with everyone asleep )

cheers

V.

 

[MapisM]

a wee crank (what 20kg?) in relation to the boat weight (say 20ton?)

LOL, you should think a tad bigger than that.
Jfm boat is in the "small ships" league, you know...

 

[vas]

LOL, you should think a tad bigger than that.
Jfm boat is in the "small ships" league, you know...

I know MM,

but since I've not got a clue on the weight of a big effing crank of a 20litre diesel engine and since the question wandered about different craft layouts and sizes, I thought the 1:1000 analogy sounded alright...
Coming to think of it would be the same saying 50kg crank vs 50ton craft

V.

 

[MapisM]

a 20litre diesel engine

That's yet another underestimation I'm afraid: they aren't called C32 for nothing...
I see your point on the analogy, anyway.

 

[henryf]

Hi Steve
Actually there isn't a hump, at least not that you can notice. You completely do not notice the trnasition from D - SP - fully P. In fact there is pretty much no hump that you can feel on any boat above say 50 feet - thing of the t60 Aura you were on, I bet you couldn't feel much hump on that?

So the tabs don't help with hump. Also they will not be used for left-right levelling, even though they could, because the fin stabs do that automatically. On a fin stabbed boat, it's importnat to keep the tabs even port-starboard and not have one lower than the other, otherwise the stabs will cancel the twisting effect of the tabs but in doing so will add drag and more fuel

Hence, the only thing they do is adjust bow up/down trim in case that needs to be adjusted for economy and dropping the bow down into a chop

I'll try to get some more pics next week. HNY to you too!

When we bought the P50 I hadn't driven one or even been out in one. Someone had suggested the Mk 3 P50's were under-powered and I should be cautious. To be fair the very first ones had D9 engines so that might have been true.

Ours had CAT C12 lumps so I dismissed their mutterings but in the back of my mind there was a niggling voice. Having taken delivery we headed off down the Hamble and turned right onto SouthamptonWater. It was flat calm, I checked all the gauges and throttled forward with a degree of trepidation wondering if we'd be able to get on the plane.

After what would have been the time when the old P42 popped up onto the plane nothing. My heart sank. I was concerned that I'd bought a lemon. I looked down at the gauges to see just how bad things were and to my surprise 32 knots was showing. As JFM says I was taken off guard by the combination of a larger hull and engines with more torque than a Jumbo Jet. There was no hump so I hadn't realised how fast we were going !

Henry

 

[Piers]

Yup. Anyway, i've come round to the view, in my old age MapisM ;D, that a big tender is important.

Without creating a thread drift, John, if I had a big enough Trawler I'd want to look at one of these....

http://wahooribs.com/

Piers