pilot

Members
  • Content Count

    210
  • Joined

  • Last visited

Everything posted by pilot

  1. pilot

    New Hugo Boss Spotted

    The last generation IMOCAs are a lot more unstable without keel than previous generations were. At least HB and Charal that share the same hull design. This is because foils start to work so early that it is wise to optimize the hull to have less wet surface in displacement mode. This means hulls are narrower and more round. This is pointed out in this video as well:
  2. pilot

    New Hugo Boss Spotted

    A new virtual tour is added into hub: https://www.alexthomsonracing.com/the-hub/internal-360-tour/
  3. pilot

    New Hugo Boss Spotted

    These pictures and a lot more is available here: https://www.alexthomsonracing.com/the-hub/gallery/
  4. pilot

    New Hugo Boss Spotted

    Yes, I mean what he is wearing on top of the sunglasses. Garmin does not seem to be among official suppliers. So it must be a useful kit - he does not war it just for advertisement.
  5. pilot

    New Hugo Boss Spotted

    I have no clue on what this claim is based on but I do hope so as well. At least Alex has confirmed that he'll be ready for TJV. So he either was mapping polars for such a case or he had spare foil waiting for it to happen. Another article is coming. Can anyone tell is Alex wearing a set of Garmin Nautix In-view Display in this teaser picture:
  6. pilot

    Why so nose up on foils - IMOCA

    I understand that there is a limit longitudinally by the rules, but i meant further out from the center line. The beam is nowhere close to the limit in case of new foilers. I see that rudders can be easily developed into something else like daggerboards were developed into foils. The vertical position of the rudder is not guaranteed anyway and they acting a bit like a stabilizer. The force it crates has a yaw component and a vertical component, like with T rudders. The attack-angle of the hull dictates how much average lift is generated. The pulling force of sails generates a yaw moment that forces the autopilot to turn downwind and this also makes the rudder to generate more lift. The angle of attack will depend a lot of the needed yaw moment but this can be corrected by changing foils angle of attack. It would be much easier to sustain flying if the rudder fin would be placed outside of hull and pointing more inside. The closer to the center line the more of it comes out of water during liftoff by the help of heeling.
  7. pilot

    New Hugo Boss Spotted

    This is more like long term measure that you cannot count on in case of sudden dynamic load. And at least with the broken foil you can limp to home. What they probably had to do today.
  8. pilot

    New Hugo Boss Spotted

    The best fuse is the foil itself. Probably they calculate the braking load to be just under the rig RM limit. You can sail with missing foil but not without the rig.
  9. pilot

    New Hugo Boss Spotted

    It looks like they broke the starboard foil. A stump looks to be still there but the rest of it is nowhere seen: Source - Plymouth Yacht Haven
  10. pilot

    Why so nose up on foils - IMOCA

    In what perspective yaw? Horizontally or in yacht perspective? Even if both rudders were vertical in yacht perspective they are affecting both yaw and pitch when heeled. Edit: And I think if rudders are canted inside (like V shape) you don't need to control both with autopilot. Only the windward one that is more vertical to control the yaw. Leeward rudder can be fixed instead of puled out and it is still stabilizing the boat and lifting the stern depending of the fixed angle. The vertical windward rudder is balancing out what ever yawing forces the leeward one is generating... I am curious, can rudders be placed outside of hull dimensions by rules?
  11. pilot

    New Hugo Boss Spotted

    I see it this way that for speed they need to induce greater heel angle. By heeling they can shift the center of sail pilling force over the center of resistance mainly generated by foil and the more it heels the less by keel. And actually the more it heels the more it creates turning force toward wind (sail force is more away than the center of resistance). To compensate this the rudder must turn also toward wind and in doing that it raises the stern. The more it heels the more has the rudder useful angle for lift. This explains also why the rudders have paced more vertical than it would be optimum according to the hull surface. So, we can see them flying if they manage to find the point of balance. I am not surprised if this requires some negative keel angle. And because everything has to be balanced by one surface it is highly unstable. While the stern is rising the angle of foils needs to be changed and this is not automated.
  12. pilot

    New Hugo Boss Spotted

    You can see all the telltales from the cockpit through the windows. Cameras are more like for keeping eye on from the bed. Or during the night because I don't see any integrated light on deck.
  13. pilot

    New Hugo Boss Spotted

    Understood. The only benefit now is to place it into more exotic place than the propeller shaft allows. Which turns out is practically the same where the engine was located.
  14. pilot

    New Hugo Boss Spotted

    So, if you have Watt and Sea hydro-generator, you are not allowed to take it off from transom? I remember that previous gen HB had Watt and Sea stored just in case but they never used it.
  15. pilot

    Why so nose up on foils - IMOCA

    Theoretically it is possible to lift the stern up by using rudders but this is a bit draggy option with the current setup - both needs to look more outwards. The more it heels the more the upwind rudder needs to work with it tip as horizontal stabilizer. This drag can be reduced by making rudders longer with asymmetric profile and with higher angle between them. Like upside down airplane with V tail.
  16. pilot

    New Hugo Boss Spotted

    It has electric ballast water pump by the way (right arrow, left one points to the scoop): Usually they let gravity to do the work for all ballast before they tack. Pump is only needed if something goes wrong. They cannot use scoops while flying. Then they need to pump the water through the inlet in the keel. I assume this is the transparent pipe in the right.
  17. pilot

    New Hugo Boss Spotted

    Yes. If it is done properly then nothing serious. But probably you are right and these kind of heavy stuff cannot be handled as movable ballast by the roles. I can propose two ways how to do it. One is horizontally swinging arm, similar to what the navigation panels used to have. In this way you can keep pipes and cables connected through this arm. But this solution requires a lot of room and dictates the cap between bulkheads. The other option is to use tracks, similar to what the mainsail traveler uses. When I first saw the fat stern of the new HB I was convinced that it has such platform in there. That can be slided from one side to another behind the bulkhead under the mainsail traveler. But it looks like there are high beams supporting the hull that cut the room into segments. And I think I saw another set of ballast tanks from the latest video as these bags were on top of higher surface. So, the movable ballast will be handled in the hard way in this tight room.
  18. pilot

    New Hugo Boss Spotted

    Actually I am a bit surprised that they installed the generator into stationary location. I was expecting it to be on a platform with another heavy stuff that could be moved from side to side. This would be the major benefit over the stationary motor in my eyes. There might be more indirect benefits in having a lot of solar panels. For example if it produces more energy than you need you can run a small conditioner or dehumidifier. This means less weight as ropes, sails, clothes and even the air can contain a lot of water. And if the conditioner pays of weightwize then it helps the pilot a lot in the areas where solar panels definitely produce more energy than needed.
  19. pilot

    New Hugo Boss Spotted

    They anyway are not allowed to use motor during the race. The reserve fuel is enough to meet the rules I guess. There might be conditions where the sky is cloudy and HB is flying too high to generate electricity by motor and Alex has to run the diesel generator. For this they need some extra fuel. But even if he runs out of fuel there is still option to slow down and recharge batteries in short time. They don't have to take significantly more batteries than they had on previous boat because of electric motor. The generator weighs 90kg. To justify the weight they need at least same amount of fuel (including the reserve) that gives the energy that can be stored into batteries with the same weight (including the fuel). I made some calculations and worked out that starting from 3,8h working time the generator pays off. This means that 4.25l of diesel fuel gives the same amount of energy as 93,5kg of LFP battery. Other calculation shows that (20 m2 of) solar panels can produce together with the generator in very a bright day quite close to the power that the engine can consume. So, if solar panels are the primary source of energy then they only need enough batteries to survive a very fast night. The question is, which setup is lighter: a diesel engine + 225l fuel (187kg) + Watt and Sea generator (7,6kg) a diesel generator (90kg) + 20m2 solar panels + electric engine (ca 30kg) I am quite sure that the new setup is lighter in the start but is it up until to the finish?
  20. pilot

    New Hugo Boss Spotted

    I didn’t mean the boat. Somehow they managed to build it 100kg heavier by spec. But the power setup probably depends of time.
  21. pilot

    New Hugo Boss Spotted

    No, there is a solid hatch cover hidden in above the doorway. The fabric is only like a spayhood or something. The generator looks to be Fischer Panda AGT 4000 PMS. Probably the 48v version as there is a 48V to 24V converter near by. If it can maintain 5 knots with 4kw of power then they need batteries only to keep electronics and autopilot running through the night. Alternative to solar is to use hydro generation that the engine (Oceanvolt AXC-10) provides. Maximum power that it can put out is 10kw but they don't need this constantly. I believe this setup is much lighter than the previous one.
  22. pilot

    New Hugo Boss Spotted

    More observations: In the latest pictures there is a folding seat attached to the wall. In this video the same wall is clean and empty. So the seat has been added later than the video was made. I expect one more (attachment point) to be added in future for driving head out of the hatch. I noticed that the throttle leaver is placed on the wall backside of the cockpit. Looks strange place for it. Probably the boat is maneuvered by using the second (larger) hatch on the port side. These two rudders are (probably) not connected closely behind the transom. There is a beam with several bends connecting those two sides in the cockpit above the door. So if Alex is seating outside on the port side, like we have seen in earlier videos, and the rudder is pulled up on that side then the steering goes long way through cockpit to the port side using at least 8 ball-joints. After first pictures I imagined they managed to work out a solution for keeping the deck clean of lines and sheets. But nothing has changed. Not much of this 20m2 of solar cells will stay effective.
  23. pilot

    New Hugo Boss Spotted

    The engine is Oceanvolt AXC10 and this supports hydrogeneration.