Sadly I have not seen the series, but that plan "B" craft looks far above and beyond the plan "A" version. Guy's second team are really the men for the job. Excellent stuff indeed.
A lightweight kayak or and Epic V-10 rowing shell could have also been a very good choice for a hull for it. It would have been close in design to the boat known as the flyak. It was a hydrofoil kayak.
so much is not discussed/mentioned, here. after watching, to 3:50, here is some info, just in case. it is a certainty that a human Cannot produce an amount of horizontal thrust sufficient to overcome the Drag at the hull and/or the foils. it will be Necessary to utilize a, correctly spec'd/configured, submerged prop. it will be Critical that the drive train be Correctly conceived. it is Correct to load a prime mover via (reduction) Mechanical Advantage; MA. where a human is to be the prime mover, it will be Critical to make use of an optimally designed first stage of power take-off. the first stage of power take-off should include high-ratio reduction. (in a single stage; NOT multi-stage or close-ratio. ) (reduction) MA partially isolates the human/prime mover from the load. if this is not done, a physically fit human will only last a couple minutes. observation of functional foil craft suggests that correctly configured foils, produce the desired amount of lift, while also being a potential source of stability. googletranslate ruclips.net/video/EqlCzNTM0EA/видео.html
I think their design is way to far different from the original record breaker. Seems it needs a super efficient prop like the one that powered the man powered flyers for example. That club looks way way too thick to me. Good luck any way. And thanks. Paul in Thailand.
When it foils, everything above the waterline is useless. This must be a lot lighter than the original plan. And he seems to have some real experts in his team.
looks like you maby making a mistake , cz hydrofoil boats have their "proppellers" attachd to the front of the boat . and guys boat have propeller attachd to the middle of the boat
I'm not sold on the (air) propeller so high up... moment of force is well above front hydrofoil. Have to wait and see. Perhaps a plan "C" could put a (water) prop at the hydrofoil level and remove the crank arm moments.
I'm guessing that a submergef propeller that worked on the top speed range would have such a high blade angle that a human couldn't get the boat airborne with it.
much more drag if the prop is in the water. And that will be dynamic drag from spinning, AND dynamic drag from moving forward. I guess you negate the poor thrust line by pointing it up a little, and possibly to one side to offset the torque.
I'm thinking a boat prop would keep the center of gravity lower and be much more stable than this monstrosity. Especially if they do manage to get it up off the hull and onto the foils.
I dont know anything abaut boats. But i think it should be made of only 2 materials. Carbonfiber and titanium. The weight would be abaut the half. And weight is all there Matters here.
For top speed weight is not that relevant, drag is the limiting factor. A train has a very low power to weight ratio but low drag. The Eurostar train has about 15w/kg but a top speed of around 300 km/h. The ford model T has about 28w/kg but much more drag, hence it doesn’t have a top speed of 500 km/h. Power to weight determines the acceleration am d power to drag the top speed!
@@robertwoodliff2536 At the 15 o 20 miles an hour maybe they would like for it to go neither of those things are that important. Saving weight and drag in the water are the most important subjects to address. A surfboard would have done a better job. If they wanted to create an aerodynamic shell around him they could have used lexan, coroplast, or mylar.
Next time, make the propeller out of foam, coat in fiberglass, then use acetone to dissolve the foam from inside the fiberglass. Vacuum bag when laying the fiberglass, drill out the center of the driveshaft to reduce weight, center of the propeller is not shaped properly.... need I go on with all the problems I've already spotted in less than 5 minutes. You seriously need a real engineer involved with these projects, whoever you have now is shit.
Sadly I have not seen the series, but that plan "B" craft looks far above and beyond the plan "A" version. Guy's second team are really the men for the job. Excellent stuff indeed.
really enjoy watching guys videos he is an awesome down to earth guy that is full of knowledge, grate watch just wish the videos was a bit longer
Would Anyone else like to meet guy too he's a true legend
He seems a bit FIG JAM to me. Probably takes speed to keep him so ON all the time.
Knighting Guy Martin would put some credibility back into the honours list.
Very cool shot of a UPS delivery fella! Clean cut, well presentable.
Love guys overalls on the line drying for his next graft 🙏🏻👌🏻👌🏻
Quite an impressive plan B. Looks heaps more legitimate than the cat.
Thumbs up to guy Martin... 🤟💀
Even the amazon dude knows lmao
Great episode. Small fact, Balsa wood is actually classed as a hardwood!
a lathe in the living room, my kindda Guy =D
Cool...hope Guy will have a new record !
top bloke and very down to earth 👍
Always has to get the sponsors in
👍Looks promising!
A lightweight kayak or and Epic V-10 rowing shell could have also been a very good choice for a hull for it.
It would have been close in design to the boat known as the flyak. It was a hydrofoil kayak.
Thus seems to have the advantage of hiding most of the equipment behind a fairing.
Imagine being Guys's delivery driver.. a stop or 2 every day for about 50 different projects XD
The Plan A guys are College Educated .. The Plan B guys are real life builders and racer..
so much is not discussed/mentioned, here. after watching, to 3:50, here is some info, just in case.
it is a certainty that a human Cannot produce an amount of horizontal thrust sufficient to overcome
the Drag at the hull and/or the foils. it will be Necessary to utilize a, correctly spec'd/configured,
submerged prop. it will be Critical that the drive train be Correctly conceived.
it is Correct to load a prime mover via (reduction) Mechanical Advantage; MA. where a human
is to be the prime mover, it will be Critical to make use of an optimally designed first stage of power
take-off. the first stage of power take-off should include high-ratio reduction. (in a single stage;
NOT multi-stage or close-ratio. ) (reduction) MA partially isolates the human/prime mover from
the load. if this is not done, a physically fit human will only last a couple minutes. observation
of functional foil craft suggests that correctly configured foils, produce the desired amount of lift, while
also being a potential source of stability. googletranslate
ruclips.net/video/EqlCzNTM0EA/видео.html
Flying in the face of traditions...
Basket or basket cases, that is the question!
I think their design is way to far different from the original record breaker. Seems it needs a super efficient prop like the one that powered the man powered flyers for example. That club looks way way too thick to me. Good luck any way. And thanks. Paul in Thailand.
When it foils, everything above the waterline is useless. This must be a lot lighter than the original plan.
And he seems to have some real experts in his team.
Guy you have saved 20 kg just by cutting you hair proper hero 👍
looks like you maby making a mistake , cz hydrofoil boats have their "proppellers" attachd to the front of the boat . and guys boat have propeller attachd to the middle of the boat
I'm not sold on the (air) propeller so high up... moment of force is well above front hydrofoil. Have to wait and see. Perhaps a plan "C" could put a (water) prop at the hydrofoil level and remove the crank arm moments.
It such an obvious idea that I'm sure there is a good reason why they don't use a submerged propeller.
I'm guessing that a submergef propeller that worked on the top speed range would have such a high blade angle that a human couldn't get the boat airborne with it.
@@AnttiBrax Wattage is wattage and Guy only has so much. Much higher coefficient of energy transfer in a medium like water than air.
much more drag if the prop is in the water. And that will be dynamic drag from spinning, AND dynamic drag from moving forward. I guess you negate the poor thrust line by pointing it up a little, and possibly to one side to offset the torque.
1:47 cant tell from this far away but that looks like either an RS200 or an RS300 dinghy. anyone else do sailing who can clarify?
Wow, that’s gone from tin pot to top tin 👍🏻
Would a normal boat propeller work better?
This seems such an obvious question that there must be a very simple answer. I wish they explained it (maybe they do in the full episode).
If it was to be used under water then yes, a boat screw would be best, but this is to be used in air to provide forward thrust just like an aircraft.
I'm thinking a boat prop would keep the center of gravity lower and be much more stable than this monstrosity. Especially if they do manage to get it up off the hull and onto the foils.
@@thescubersteve5214 I think monstrosity is very descriptive for that log
I dont know anything abaut boats.
But i think it should be made of only 2 materials.
Carbonfiber and titanium.
The weight would be abaut the half.
And weight is all there
Matters here.
Well you said some truths there. :)
For top speed weight is not that relevant, drag is the limiting factor. A train has a very low power to weight ratio but low drag. The Eurostar train has about 15w/kg but a top speed of around 300 km/h. The ford model T has about 28w/kg but much more drag, hence it doesn’t have a top speed of 500 km/h. Power to weight determines the acceleration am d power to drag the top speed!
@@TPNL1997 Weight is very relevant here because the foils need to create lift to overcome it and more lift means more drag.
Why not add a gyro that controls the fins.
I would have ditched the fiberglass body all together. It's just added weight.
It adds aerodynamic & good load distribution.
@@robertwoodliff2536
At the 15 o 20 miles an hour maybe they would like for it to go neither of those things are that important.
Saving weight and drag in the water are the most important subjects to address.
A surfboard would have done a better job.
If they wanted to create an aerodynamic shell around him they could have used lexan, coroplast, or mylar.
Next time, make the propeller out of foam, coat in fiberglass, then use acetone to dissolve the foam from inside the fiberglass. Vacuum bag when laying the fiberglass, drill out the center of the driveshaft to reduce weight, center of the propeller is not shaped properly.... need I go on with all the problems I've already spotted in less than 5 minutes. You seriously need a real engineer involved with these projects, whoever you have now is shit.
The propeller man should know that balsa wood is a hard wood !!!!!!!!!!!!!
ruclips.net/video/RvE6Xd6tgPA/видео.html - I don't get why they just didn't copy these proven designs
No way that propeller provides enough thrust.
The current record holder used air propeller and they were actual scientists. There must be a good reason.
im number one everyone else is two or less
@@brianwhitby2703 fucking boring idiots, your being played dummy