Weight of a 34 ft sports express cruiser

The next following model 34PC 2006 variant has a published weight of 7,126 Kg. This is more in line with what I am seeing on mine for a near identical layout. Maybe they published the weights incorrectly in 1992?
 
When I got my last boat, all the specs were based on their estimated design and not an actual boat (as the first boat had not been built yet). These figures were wrong. The only one I actually remember was a 2cm discrepancy in the width. These published figures (in their brochures etc) were not changed for a long time, I guess because of the expense of printing.
 
Check if the quoted engine weight is 'dry'
Check for water in bilge
Get your hull moisture tested
 
Thanks Bouba. The brochure does not specify. The bilge is dry, she is a very dry boat and has also had the hull epoxy coated at some point. Moisture in the grp would not account for so much weight surely? When I checked the bilges the front two compartments were so dry it was actually dusty, the engine bay / cockpit section had maybe 2l of water in the bilge pump couldn't pick up. Fresh water from hosing down the decks.
 
Average is above six to seven tons (6/7000 kg) for standard European models (Fairline 34 Targa / Cranchi 34 Zaffiro / Gobbi 345 SC / Sessa 35 Oyster / Jeanneau Prestige 34).

That Formula 34 PC is a bigger boat overall measuring like 38/39 feet total so the 8 tons number is not so far off IMO.
Also most US boats of that size usually have a bit of a larger fuel tank, and come also with generator a standard.
 
Also bear in mind ... not all boats are built equally.

I know there are layout specs for each section of the boat, but it's not an automated process, and if the guy on the shopfloor on Wednesday decides that he prefers a couple of extra layers of mat there, and a bit of extra flowcoat here, it can add up. Probably not 100kg worth, but no two boats will weigh exactly the same, even taking fitted options into account.
 
Thanks for the responses. It's a conundrum but I imagine it's a combination of elements that have increased weight. My concern is does she now exceed what her power train was designed for. I'm still struggling to get a balanced performance from her. With C3 props on she doesn't need the boost from superchargers or turbos but is limited to 18knts cruise before max revs. With C4's on she struggles to get to turbo boost but once on turbo boost feels under propped. Which means I get to travel at hull speed or above 18knts and nothing inbetween. Falling off the turbo boost at ~3200 rpm and between the supercharger cutout at 2400 rpm is a dead spot that really lugs the engines with C4's on. I feel she should be running C5's or greater once on the plane but will never get there in the first instance.
 
If the original weight was calculated with petrol engines and now they are diesel then that is likely a good starting point.

Diesel lumps and ancillaries (including drives and duo props) are a lot heavier. I have an S28 with twin KADs and 5 leisure batteries in the back and moor next to a single engine mercruiser diesel with 3 batteries. My boat sits at least 4 inches lower in the water. To the unknown eye it would look like it was sinking in comparison.

Batteries are another area to look at - 25-30Kg each for a standard Lead-Acid. If the bank has been enhanced that will account for extra weight.
 
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