Postby Mike Habib » Tue Mar 08, 2005 1:14 am
Just a few thoughts on mounts from the biologist's perspective that might be helpful...
First off, warhorses almost certainly could not obtain speeds of as high as 45 mph. Modern racehorses have enough trouble reaching such speeds, let alone a highly encumbered warhorse (which was much less specialized for sustained speed). Animal speeds are routinely exaggerated in the literature (for a discussion of this problem, and some more accurate rates, see papers by McNeil Alexander, or his recent 2003 book on animal locomotion, as a good start).
Most recorded speeds for modern horses are from thoroughbred racehorses, which are not a good comparison for a warhorse, as mentioned. Secretariat hit a speed of 37.6 mph in the 1973 Kentucky Derby. That's about as fast as horses get. Very short sprints might be a hair faster.
That being said, what makes an animal (or different types of horses, specifically) especially fast is somewhat complicated. Size does have an effect, but simply being big and strong does not make an animal fast. There are three speed issues to consider for medieval mounts:
1) Acceleration (including turning)
2) Sprint speed
3) Sustained speed
I do not know the specifics of these for Steppe horses and warhorse type breeds (though I could probably find out). Warhorses should have been bred to accelerate into a charge well under loads, and they probably did so admirably, all considered. Overall, however, they would have needed to exert tremendous power to accelerate to charge, to decelerate to stop, and most importantly for this discussion, to turn. The agility of a heavily weighted warhorse would have been pretty low compared to a Steppe pony/horse.
Sustained speed usually gets a boost from size (to a point) but I suspect, again, that additional weight would have made sustained runs more difficult.
We should try to find more specifics on how different horse breeds map out on the speed and agility spectrum. I have a few texts at work that may help...
Strength and Honor,
--Mike Habib
Michael Habib
Center for Anatomy and Evolution
Johns Hopkins School of Medicine
habib@jhmi.edu