xkcd @lemmy.world schnurrito @discuss.tchncs.de 1w ago

xkcd #3013: Kedging Cannon

xkcd.com Kedging Cannon

The real key was inventing the windmill-powered winch.

https://explainxkcd.com/3013/

29 comments

This makes it a one-cylinder motor, right?
- If so, it’s a one-stroke motor. Kinda, sorta, maybe :P
  
  How much squidpower we talkin' here
  
  Nah. They need to push the gunpowder in from the "boom" side. We also count the "outs". Anchor into the cannon is a separate step and cannot just be hung on the outside.
  
  Boom, gun powder in, stick out, anchor in, stick out.
  
  5 strokes unless we count a "suck" for cooling the barrel.
  
  Thoughts?
but how do you sail upwind?
- So, wait, sailing is just horizontal flying?
  
  I learned this when playing Valheim
- Edit: I have been corrected. Please read the follow-up comments for better information. I'm leaving the original text below for context and transparency.
  
  As I understand (I'll happily be corrected), the basic mechanism is that you want to align your ship diagonally off to the side, and the sails at a shallow angle so that the wind pushes you to the side (diagonally back and to the side, but the hydrodynamics of your bow resist the backwards component), so you gain some momentum. Then you turn into the wind to have that momentum carry you forward, sails parallel to the wind so it doesn't push you back as much. Turn off to the side again (either back to the same side, or continue your turn to the other side) and repeat.
  
  It doesn't move you quickly, because it's rather inefficient in transferring the wind's power into opposite momentum, but it gets you moving at least a little.
  
  Not sure if you're wrong or im misunderstanding what you are saying.
  
  When sailing upwind think of sails as an aircraft wing with the top facing forward. As the wind passes over them from one side they generate "lift" at a perpendicular angle to the sail, pulling the boat in that direction, usually a combination of forward and sideways. The sideways is offset by your underwater profile, that resists sideways movement, resulting in (mostly) just the forward movement.
  
  Square rigs like this comic often struggle sailing upwind compared to sloop rigs with two sails as the fore sail is used to generate that lift on the mail sail.
  
  I've oversimplified this a lot so please not nit pick too much.
  
  Not of the bow, but the center of all lateral resistance, which must be aft of the center of effort (sails). This includes the hull and rudder, but more important is the daggerboard/centerboard/keel, otherwise you would just be pushed downwind.
  
  And so Kedging is used only in tighter spaces where angles are not an option, like harbors or rivers
  
  Also, while it doesn’t move you quickly, it still feels super fast due to the headwind adding to the feeling.
- You don't sail directly upwind; sailboats can't do that. You sail at an angle to the wind.
  
  EDIT:
  
  https://en.wikipedia.org/wiki/Tacking_(sailing)
  
  Sails are limited in how close to the direction of the wind they can power a sailing craft. The area towards the wind defining those limits is called the "no-sail zone". To travel towards a destination that is within the no-sail zone, a craft must perform a series of zig-zag maneuvers in that direction, maintaining a course to the right or the left that allows the sail(s) to generate power. Each such course is a "tack". The act of transitioning from one tack to the other is called "tacking" or "coming about". Sailing on a series of courses that are close to the craft's windward limitation (close-hauled) is called "beating to windward".
- Tacking
That's not even tack-y

29 comments