Hmm, maybe in a rule bound country (Australia or Europe?) I'd be rather surprised if an insurance underwriter has a surveyor capable enough to even do the calculations...! Maybe for a big claim? Does the ABS HSC rule even apply to sailboats? (Never checked actually). So much of the HSC rules require one to define the wave conditions and vessel speed in those conditions. But sometimes on offshore races you don't have the choice to seek shelter so how do you pick loadsFailure to comply with the established rules for thickness places you at risk of a rejected insurance claim should a window failure occur
hmm, 2 OceanVolts/Servoprops, Li battery bank in one hull, diesel generator in the other?That Servoprop could be an interesting asymmetric propulsion system.
Have a (bigger) diesel in one hull for open water propulsion. Have Oceanvolt in the other hull.
Use both to get off the dock.
Use the Oceanvolt to drive around a harbor for daysails, short term propulsion, and power generation in open water.
Nice light weight solution... but nobody likes asymmetry except the proa people!
I think I’d choose to go backwards...So if the battery bank is near dead - you only have < 6 kW / side for propulsion. Assuming 95% efficiency (and that is being really generous - line losses, VFD losses, electric propulsion motor losses). That's 7.5 HP / side.
I guess the generators auto-start so that the bank is never depleted too much. But even still, imagine if you're trying to motor into 40 knots of wind in a narrow body of water. I think you'd go backwards...
Have you decided on Maui Jim's or 7-11 shades?soma said:-The next big decision is whether to go for laminated glass ($$$), tempered glass ($$), or acrylic ($). Interestingly, the Gunboat fleet has chosen the heavy and expensive laminated glass route. It's not often that you opt for the heavy and expensive option. Usually, you pay a premium for the light option. I equate it to buying $5 sunglasses at 7-11 vs Maui Jims.
Given that weight savings, are you pretty optimistic about the performance targets you were hoping to achieve? I know the original 55s handled like pigs, causing the quick re-do into the 57s. You've taken a completely different approach, and it's REALLY interesting. Makes me wonder what the other hulls might turn into....soma said:Project is going well. The interior has been fully painted. Systems are going in, electricians got started this week, generators are going in this week as well.
-Hybrid drive system starts to go in next week.
-Exterior paint has begun, we plan to shoot the deck gloss and coachroof this week.
-Rudder design has been finalized.
-We weighed last week and we are still on track. The trend line is going down...not into the 9.something area...more like 10.4t. That's about 4 tons lighter than a standard 55.
May isn't going to happen, likely in the water in June, certainly by July. Luckily we don't have a deadline...
As for skimming, we have targeted 8 tons of vertical lift on the leeward daggerboard at 25 knots of boatspeed (at stall). The T rudders will be set to a 0 degree AOA, and the windward board will normally be up and set to -2 degree AOA. With that said, there will be lots of playing with different modes. We have a +/-2 degree AOA on the rudder and +5/-2 degree AOA on the daggerboard T. Maybe there's a deep downwind mode with both boards half down and raked aft. Or maybe we can cheat an early upwind hull fly with max AOA on the windward board, and negative AOA on the leeward. It'll be fun to experiment. I fully expect windward heel at times, and probably flying the leeward hull, too.
4 tons is a fair bit of weight savings. It's interesting to note that it's 'better' to use an existing hull and rework than start from scratch.soma said:I'll just go ahead and say it...gulp...if 5508 isn't the fastest Gunboat I'll have failed.
Interesting, what led to the decision to go for two generators instead of one ? Failure redundancy ? Weight deistribution ? (as I assume that regarding kW per Kg, two is less efficient)soma said:Two servo props, two battery banks, two 6kw generators. There is an opportunity to criss-cross if needed.
I meant to ask, are 5509 and 5510 being completed as well?soma said:Long story short, they laid up the dry stack (carbon/foam/carbon) for 5514 in the tooling, but couldn't infuse because the resin that they had left was expired and they couldn't afford more. So they left the drystack in the tooling for weeks/months, uncovered. Then, apparently, some disgruntled employee took his rage out on the drystack and ripped it all down. They put it back up in place the best they could. Then, apparently PJ was getting really short on cash, so he instructed the workers to infuse the hull with expired resin, presumably to trigger a progress payment.
I've heard this story from enough people that I accept it as true. To put it another way, we felt that this information was "true" enough that I wouldn't sell it when I worked at Gunboat.
To clarify, the hull in question is 5514. There is no 5511, 5512, or 5513. I guess the buyers of 11 and 12 knew it'd be cheaper to walk away from their deposit than to move ahead, so those projects never began. Presumably, you skip hull 13 because it's 13.
5514 was the last boat infused. Last I saw it was still in the tooling.
Interesting....I note that neither Gunboat nor the current owners are on this list. Pretty telling....soma said:The hull itself is pretty heavy. You'd definitely do better weight-wise starting from scratch, but we picked up 5 tons of carbon, foam, and resin fully assembled for $0.10 on the $1. So that IS better. Starting from scratch (in the US) would have cost an extra $1m - $1.5m (and probably could've saved 1 ton)
The obvious names, CDK, Multiplast, Persico, McConaghy. I'm absolutely blown away by the value that Marsaudon offer. They built Idec, Paradox, etc, but they also build the TS boats at a fraction of the cost of the competition.