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I am playing in a medieval fantasy type setting and am trying to determine travel speeds when people are traveling on rivers. This is similar to this previous question, but that question really only covered ground-based travel speeds. Assuming normal medieval/early Renaissance type methods of travel, and putting aside the question of magical augmentation,

  • How fast can a sailboat travel downriver with a tailwind?
  • How fast can a sailboat travel upriver with a tailwind?
  • How fast can a sailboat travel downriver with a headwind?
  • How fast can a sailboat travel upriver with a headwind?
  • Were there other commonly used forms of travel by river?
  • Did boats typically dock for the night?

Thanks for any help!

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You haven't been getting very good answers to this question. You might consider asking it on history.SE instead. –  mxyzplk Jul 27 '12 at 18:37
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up vote 3 down vote accepted

According to this source, the speed of a sailing boat depended on the waterline length.

The exact formula quoted there is hull speed = 1.34 * sqrt(waterline length)

A boat with a waterline length of 50 feet would therefore go about 9.34 knots (~17.3 km/h or ~10.75 mph). This of course only applies on open sea with good wind.

I have not found any sources for the maximum speed on a river, but I guess it's safe to say that it would be half the speed, at best.

Those guys discussed something similar, and came up with an average travelling speed of 5 knots (~9.26 km/h or ~5.75 mph) for a trading ship with a waterline length of 75 feet. That would, of course, change depending on wind conditions, the river (Does it run straight or in a lot of turns?) and your direction on the river (Upriver, downriver). But I have no Idea how the exact modifiers are for this.

As for the rest of your questions, I have no idea and hope that someone else here can help you. Take this as a general direction, not a fully fleshed out answer. ;-)

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I'll be using estimates from that second source, so will accept this answer, thank you! For posterities sake, maybe edit the answer to include the hull speed formula (hull speed = 1.34 * sqrt(waterline length) )? –  Ckhrysze Mar 15 '12 at 14:26
    
@Ckhrysze I added the formula –  malexmave Mar 15 '12 at 15:19
    
Yes, hull speed is a limiting factor (not just for sailing boats). Similarly, a limiting factor on the speed of your car is the temperature the tyres can reach without melting; not always useful. –  TimLymington Jul 23 '12 at 20:11
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"Were there other commonly used forms of travel by river?"

Yes, there were: towpaths, (timber) rafting, rowing, and warping (for example on river barges: people with a small boat rowed ahead and farther away from the big ship sank an anchor. Now the team on the big ship adducted themselves and the great boat with the rope (connected to the anchor), pulled the anchor again, and the tedious game began again. Cf. also the German Wikipedia article or its Google translation.)

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Huh, I didn't know there was a difference between rowing and paddling, thanks for that link (and the others)! I've seen pictures of single sail boats that also involve rowing. Without know much about it, that seems fairly ideal to be able to go both up and down stream, but the link on towing suggests that fighting a current may have been impractical. –  Ckhrysze Mar 12 '12 at 18:55
    
@Ckhrysze: "fighting a current" Yes, everything is much easier with the current or at least with a body of water which is flowing very slowly. Yaztromo's comment above is right about it. - There was also the report (I do not have an on-line reference ready) about some people at some time using a floating ice sheet (downstream), which is dangerous but my be an option at some time (this is about RPG after all). Did I mention wine barrels (downstream)? –  Stephen Mar 13 '12 at 19:13
    
@edgerunner: The German and English Wikipedia sites are quite different, therefore I would really prefer to keep the translated German version. I am in doubt whether the link from Treideln to Burlak is really right. –  Stephen Mar 20 '12 at 19:50
    
@Stephen yes I figured that but Google Translate is not doing a good job there. Most of the automatic translation is incomprehensible gibberish. Maybe you could consider adding both of them to your answer, or for an even better result, translate the good information from German to English on Wikipedia itself. –  edgerunner Mar 22 '12 at 19:37
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@edgerunner Yes probably should do a translation, but probably also should finish my thesis... –  Stephen Mar 22 '12 at 20:23
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I have to assume that you're talking about a major river (Rhine or Thames up to London). Anything smaller is just going to be too twisting and shallow to be practicable for trading. That simplifies it, because current is fairly negligible, assuming the captain/pilot has enough local knowledge and is not constrained by draught (I've tried it). Wind direction, on the other hand, was vital. Sailing barges early last century, with considerably more advanced rigging, often waited days for a favourable wind; that was one reason why steamships (expensive, slower in favourable conditions but reliable) took over so fast. The Vikings were among the most advanced sailors of their time, using a tacking pole or beitiass, but even they couldn't go closer than maybe 60 degrees to the wind; a lot of tacking in open sea, a lot of waiting for a wind in a river. Rowing, poling (like punting) or towing by packhorse were useful substitutes. None of them were faster than 3-4 mph. Sailing with the wind would probably be 5-6 mph, but anything faster than that (on average) would be spectacular.

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Here are a few references, although you'd have to read through some journals, etc.

Captain John Smith's Voyages - includes boat description

Sir Francis Drake: Traversed Strait of Magellan in 16 days.

Viking ship speeds - Lists the speeds of Viking ships as 3-6 knots depending on conditions, and links at the bottom to further discussion by the author. It also says that the crossing to Iceland could take as little as 3 days, but that was an extreme rarity.

Edited to add: I have really come up dry searching for this, but did run across something that might work. It referenced the fact that the Thames used to be twice as wide, and ran half as fast. So, maybe if you can find (or make up) the current speed of the river, take that either away from or add to the average speed of the desired craft you would be pretty close.

So if you take the hull speed calculation and then add/subtract the river current, you should have it. I don't think there is going to be a definitive answer, from what I've been able to find.

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These are about sea travel, but the question is about river travel. Did you come across any references to river travel times while looking for these? –  SevenSidedDie Jul 24 '12 at 17:36
    
No, most of them all referenced sea travel. I couldn't find anything on river. I thought there might be some river travel reference in the Smith's journals (Such as landed here, took boats upriver to X), but I haven't had time to read them. The viking ship link did have some references to river travel (I think in the secondary link from it), but nothing specific IIRC. –  JohnP Jul 24 '12 at 18:19
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Ah, too bad. It's just that, RPGs generally have good-to-excellent guidance on sea travel but not river travel, so this question is aiming to fill a very specific hole. –  SevenSidedDie Jul 24 '12 at 18:25
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