Ep8 - Human Power - Road to the 37th America's Cup
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- čas přidán 4. 09. 2024
- It's a simple question - How do you power an AC75?
This time around for the third generation Cup boats the answer is different depending on whether you're talking about above or below the waterline. And this time around cycling looks set to be the answer.
Matt Sheahan goes behind the scenes at INEOS Britannia's base in Barcelona to find out how the human power plant on an AC75 works along with what and why it has changed from last time.
Road to 37th America's Cup is produced in association with Yanmar who commissioned this series.
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I think an interesting change to the class for next time (assuming the terms of the next challenge don't break the agreement to use AC75 again, and all the mess that would entail) might be to go back to 8 grinders and drop the idea of pre-charged batteries, making the whole boat directly powered by those onboard. I think the biggest complaint about this class has been this idea that it gets away from crew involvement. I'm not sure I 100% agree, but at least if there's zero pre-stored energy, but instead a conversion with a buffer it might help sell a few more fuddy duddies on this direction for the top class of sailing. I know they wanted the separate electrical system as a kind of insurance against a hydraulic failure sending the boat into a dangerous maneuver, but after 8 years and 12 boats (plus the dozen AC40s and the LEQ12s) I think the class ought to be mature enough to take those training wheels off for the next round.
one should do some number crunching to see if that's feasable, but my suspition is that the force requirements for foil arms and flaps, given the frequency of activation make the power requirenments to high to be hadable by manpower
Great insight into human power on the AC75’s! Much appreciated & well done by all! Looking forward to see how it goes!
There is one thing I don't understand and that is why are they comparing endurance cyclists to grinders? Why nobody talks about TRACK cyclists!? This guys have nuclear power legs and I believe are able to outmatch any grinder in terms of power output.
Once again the Kiwis lead the way
Very informative 👍
Have teams tried the recumbent position for the cyclors? They would sit lower in the boat so less drag and pushing against a backrest might allow them to generate more power over a longer period.
The pods have fixed dimensions which will not allow that
An interesting thing about recumbent bikes is how hard it is to feel power output without telemetry, power and heart rate. You don't move on seat like an upright bike.
American Magic is doing it that way:
czcams.com/video/Gvkx6oF_Zyk/video.html
it is actually harder to put down watts in the recumbent position, but they seem to have found that aero benefits make up for it.
are there specs or documentation regarding the batteries? they sould be part of the AC75 spec right? I've been unable to find any info.
Edit. i've seen press releases by Torqueedo mentioning AC36 used the company's Power 48-5000 battery pack. although no mention on how many unit each s/y carries
Same here. Was wondering about that
Some of them are top athletes regularly tested for dopong
Do the crew/cyclists get tested.? are they allowed to use steroids?
I always wondered that. Especially now since the there was so much chatter in the Olympics
A more fundamental question: What is the logic of a rule requiring human muscle to power the hydraulics? Why not allow the use of batteries to power both under-the-water and above-the-water systems? And have ALL TEAM MEMBERS do sailing-related tasks.
i think they don't want to breake the facade that sailing is about crew and wind and nothing else is required
Interesting
What does cycling to power a hydraulic pump have to do with sailing?
Wrong saloon, now get!
This entire topic begs the question, will the teams be drug tested for performance drugs?
None of this will matter if the boat is slow.
Maybe look to Australia for fellas who can cycle AND handle serious heat. They'd also be mostly lighter weight men. I see these bike goobers out in 40c or 100f+, I always comment that they must be masochists
Why dont they recruit professional cyclists? Lighter and more powerful...
it's explained in the video
Good would be thats even batterys are reloaded with cycling,likely at watering all getting some kilowatts in batterys for startup.
Where hydrogen suport boats🙈🤷?
Toyota and Yanmar would develop of course!
Why not at this year all must operate only with they boats would be great.
Only for AC a week its only green washing nice advertising🤒😁.
Kiwis hade should written laws about hydrogen buying.
What?
Why not hiring cyclists?
Because a crew of 8 has to average 90 kgs. Most cyclists are 60-70 kgs. There’s only so many Dennis Connors still skippering these days.
The other reason as mentioned in the video is that aside from power-weight ratio being less of a concern, they're looking for maximum power output, rather than the specific combination of high endurance, at high proportion of output, at low mass. But clearly cyclists are still on the prospects list as a couple of the other teams went towards track riders to fill some of the positions .There in sprinting disciplines total power becomes more interesting. 1000w output is not all that uncommon. Chris Hoy could output up to 2500w. I think the bias towards the rowers is because they'll have already trained to be at peak power for longer periods, and they can't drop. Dropping your form or power level below that of the rowers along side you can be catastrophic. Look up videos of "catching a crab", that oar has an incredible amount of mechanical advantage, and can do serious harm to a rower.
I see, but there are cyclists like Van Der Poel able to output high watts for long periods…interesting though
team NZ did it in 2017.
Track cyclists yes, roadies, no.