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7854 clicks; posted to Geek » on 23 Nov 2012 at 12:27 AM (4 years ago)   |   Favorite    |   share:    more»

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fatbear: costermonger: fatbear: For everything else, I'll take my meters.

So there's easy to remember, do-it-in-your-head course correction calculations with degrees and meters too? Cool!

Yep. And you provided it.

if you're to the right of track by 1 nautical mile when you've got 30 miles to go, you need to adjust your track 2 degrees to the left
if you're to the right of track by 1000 meters when you've got 30 kilometers to go, you need to adjust your track 2 degrees to the left
if you're to the right of track by 1 furlong when you've got 30 furlongs to go, you need to adjust your track 2 degrees to the left
if you're to the right of track by 1 parsec when you've got 30 parsecs to go, you need to adjust your track 2 degrees to the left
if you're to the right of track by 1 cubit when you've got 30 cubits to go, you need to adjust your track 2 degrees to the left

Corrected sentence:
Another fun trick that works because angular distance is non-dimensional: at a distance of 57.3 units, 1 degree of angular distance is 1 unit. i.e., if you're to the right of track by 1 unit when you've got 28.6 units to go, you need to adjust your track 2 degrees to the left.

It works because the sine of 1 degree is almost 1/60th and 60 is an easy number for use to use when we do math in our head - it's evenly divisible by 1,2,3,4,5 and 6.

It has nothing to do with any division of the earth's circumference into 21,600 units.

Yeah, I realize I demonstrated a GOP-like level of mathematical thinking there. If it's a fixed geometric relationship, of course it's not unit specific.

fatbear: shanteyman:

The boat did travel in more than one direction; the captain turned his vessel onto the measured 500 Meter course to set the record.

It can't travel in the opposite direction. Not useful.

Yeah, because this thing totally chopped a bootleg turn at the end of its first run and rocketed back down the course for run two.

Now that they know they can go fast in a straight line without dying they can move on to adding maneuverability.

Sail boats can go into the wind. Not as fast as moving somewhat with the wind though. It's the same idea as going diagonally with the wind for speed. You can go diagonally into the wind and move into it. Otherwise early boats wouldn't have been able to move goods like they did. Everything would have been a one way trip.

But, using the wind I don't see a reason to make two trips like is done with land speed. Land speed does it to average out conditions like wind. Doing this to a wind powered vehicle would be like telling the land speed car it has to make the return run with the parachute deployed. It'll still go, just not nearly as fast.

Same boat, taking flight at 52 kts and crashing hard on a previous attempt: Link

Metrication for the sake of metrication is stupid. Powers of 10 are great....if you only ever have to multiply and divide by 10.

dallylamma: fatbear: shanteyman:

The boat did travel in more than one direction; the captain turned his vessel onto the measured 500 Meter course to set the record.

It can't travel in the opposite direction. Not useful.

Yeah, because this thing totally chopped a bootleg turn at the end of its first run and rocketed back down the course for run two.

Now that they know they can go fast in a straight line without dying they can move on to adding maneuverability.

"This thing" is also not useful.

Impressive and useful are not the same.

NBSV: Sail boats can go into the wind. Not as fast as moving somewhat with the wind though. It's the same idea as going diagonally with the wind for speed. You can go diagonally into the wind and move into it. Otherwise early boats wouldn't have been able to move goods like they did. Everything would have been a one way trip.

Early sailing boats could only move downwind, and they had enough brainpower to figure out how to not make it a one-way trip each time.

NowhereMon: Same Earlier version of this boat, taking flight at 52 kts and crashing hard on a previous attempt: Link

fatbear: dallylamma: fatbear: shanteyman:

The boat did travel in more than one direction; the captain turned his vessel onto the measured 500 Meter course to set the record.

It can't travel in the opposite direction. Not useful.

Yeah, because this thing totally chopped a bootleg turn at the end of its first run and rocketed back down the course for run two.

Now that they know they can go fast in a straight line without dying they can move on to adding maneuverability.

"This thing" is also not useful.

Impressive and useful are not the same.

Sure it is. It's an engineering proof of concept. And if the ideas translate from paper to water then one day they may show up on commercially available boats.

fatbear: I May Be Crazy But...:

Someone else said it, but I'll add my voice to the chorus. The important part is not the number of feet, but that it's a minute of arc. When you're travelling on the earth, it makes sense to have a unit that's base on the total distance around, since that makes navigation without fancy instruments (which anyone going out of site of land should know how to do, just in case) much easier. You can argue that we ought to split up the earth by powers of 10, but I don't see that change going so well.

Only when you're going north-south. It's great for the Bermuda-BVI run. If you're going from the US to Europe or back, knowing that a nm is exactly one minute of longitude is about as useful as memorizing all the presidents of France.

Have you ever used a nautical chart?

b-ham: Tillmaster: Tony_Pepperoni: [i.imgur.com image 225x126]

Where does that come from?

Video here.

Thanks. I wonder why he didn't throttle back.

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