Power upgrade...how much is too much?

[MapisM]

I,love take this one a 65 knot er - on in my Calvi Chalange.

Careful there. The XS is a Buzzi design, and FB is not known for building boats that must throttle back in rough seas.

Otoh, if your challenge puts the stress on passengers satisfaction rather than on the capacity to sustain high speeds, I might take you up on that with my old wooden lady - if it weren't that I just sold her, that is.
You'd better decline beforehand though, because if your wife "detests Slamming", she might be not so happy anymore with the Itama, after experiencing what REALLY non-slamming boats are all about...

 

[NBs]

It’s all relative to the sea state in the real world P -

I used that example of a real life situation to attempt demonstrate the effect of two things - which Boatbore got !

I was not inferring 28 knots is the magic figure It just turned out to be the figure on that day - which qualifies using the criteria I outlined in my definition,that you asked for .
On another day in different sea states that No will be different.

I ,am thinking PC in the sense of Performance Cruiser for offshore useage and extended time aboard here , not out and out speed machine that you reffferd to a “ lake boat “ - the one in your post of a previous boat .

The Two things I hope brought to the party ( folks keep posting pics of 87 mph boats or what ever on mirrow calm seas ) Well where are these boats I don,t see them about in the med ** ?

1- waves - note in posts ^^ I have been referring to “ headline grabbing “ printed top speeds and what I call Real World speeds -

2- I introduced weight distribution- took a gamble on this -either ridiculed as usual by all the VP outdrive mob and Merc btw , cos that’s how they come and they are brainwashed .After all there’s nowt that can be done regarding doing any other except plonk the heaviest iron at the transom .

How ever Boatbore above seems to have identified with exactly what I mean ,t -see posts #30 / 31 ^^^
For all know could have been him indeed .
The conditions where not lake like ,but not exceptional either if you have to or want to Cruise every day .No wimping out sitting out the weather .

Tell you what I will race you from Cannes to Calvi ( Corsica) 100 miles each way - 200 miles a day
Your lake 60; Knot er boat and my boat cruises mid 30 s

Oh just one thing like any sensible race let’s do a few laps - with your wife and guests too aboard - no point being selfish- let’s share the rides
10 consecutive days —- then add up the 10 aggregate times — oh and you can choose the start day - how’s that - Anybody in a 800 Hp 20 ftr can at least turn up and start on day 1 too
Only one V simple rule - you are disqualified if a passenger ( presume wife or close partner ) bails out

Not sure where a 300 ft ferry enters the Performance Crusier debate ?

The M5 is fast by everyday standards for most folks it’s very practical but limeted out of the box to only 155 mph .How ever its discrete which I understood was the point .Comparing to a Subaru WRX , an other 4 seater

It’s actually not that fast ,but in the real world on real roads it’s fast enough a big trip across Europe , it’s only Germany that possibly ( legally ) you will notice the 155 Mph with four adults and there luggage .
Only a Bentley Silver Spur 192 mph will slip past carry the same load , or a Masa QP,
Of course many mid engines two seaters will outperform the M5 .
Interesting if it snows —— ie crossing the Alps - car equivalent to a boat in a BIG sea ( that’s a liesure boat not a ferry )
I think the 2 WD , M5 and certainly the various mid engined two seaters ( ground clearance issues and lack of low profile snow tyre Fittment ) - will not just slow - but grind to a halt .
meanwhile the Bentley with 4 WD snow tyres and adjustable air suspension set high will carry on with 4 persons and luggage and arrive 1 st at the Spendido in Portofino after all setting setting off together from Berlin ,
Agree before anybody chimes in the M5 will be the fasted round the Nurburgring ring .
I,am thinking real world roads journeys and real world Performance cruiser s in a boat .
Hope that clarifys it .

Some ones gonna post a pic of a Santa pod gragster doing 300 mph in 10sec or somthing and telling me a Bentley is a slow car

** - sure I’ve seem a few “ Cigarette “ and Donzi 43s - petrols here and there in the Cote d Azur. But by heck they don,t 1/2 slam at speed , for the 1/2 hour they can last from St Trop to Pampalone .
Usually a miserable trip back when the winds blowing down the bay from Port Grimaud — Oh one more observation- young guys and boat full of totty .Girls putting a brave face on with the tangled wet expensive local hair do destroyed in the process .

Hi

Norway is located on the North Sea coast and boats are built to the sea not to the lakes, so boats are designed to receive rough water, and of course each one defines safe and comfortable cruising speed on their own boat.

Skagerag sea area may be more demanding than Med ever ...

Here's a 24 feet Hydrolift boat litle thigs...

"Product testing
All Hydrolift prototypes are carefully verified and tested for every
realistic and unrealistic action possible. The boats are tested under
extreme conditions and any necessary functions are continously
adjusted. In July 2003 we crossed Skagerak - from Norway to Denmark
- to set a new speed record. In 1-2 meter waves, with an average speed
of 52 knots, we did beat the old record set by a 41 feet offshore racer
15 years earlier. Many have tried to beat the old record. We did it in a
standard boat directly from the assembly line.
All boats are tested in water before they are delivered to the customer."

NBs

 

[sorabain]

Very well said.
My whole point, regardless of sea conditions, is that mid 30s can NEVER be called "really fast" (let alone hugely fast!) by any stretch of imagination.

I think sea conditions and the size of boat come into it, as the feeling of speed is subjective and depends on more than the actual speed, but the overall experience (including noise, rattling and anything else that makes it seem as if you're at the limit of the vehicle).

In my first car, a Citroen AX would understeer and rattle and felt "fast" whilst only doing 60 (and going around a roundabout at any speed felt like rally driving). i switched out of that straight into my dad's car at the time (some kind of Nissan saloon from the 90s, forget which), and ended up accidentally driving it far too fast without realising as it gripped the road so well and hardly made any noise.

I've only recently switched up from a 6.5m RIB to a 40' flybridge. Doing 30+ knots in my 6.5 rib felt "really fast", particularly if you got any hint of the early stages of chine walking, it certainly concentrated the mind. I expect being in such a low position helped. lots of noise & buffeting. Felt like the boat was at its limit (and my own limit). Now on the 40' flybridge 30 knots feels like nothing at all as it just yomps through it. 30 knots on the f/b feels more like 18 on the rib (i.e. easy to handle, no need for absolute concentration).

For me, I like the vehicle to reach its (handling) limit at about the same as the limit of the obtainable speed of the engines (i.e WOT) and at about my own limit of helming skill. All that combined gives me that "feeling of speed". it doesn't matter if the "actual" speed is 30, or 80. Ideally i'd prefer it to be 30, to make me more likely so survive any mishaps.

If the boat can handle far more than the engines can give it, then i think it'll never feel "very fast", even if you're doing 50+