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Originally Posted by horse_crazee i agree with shotgun and smitty and don't put anything heavy like metal, log or strong wood as a bar to jump over you'll injure your horse if she makes a mistake, so put something light like a skinny pipe, |
for the most part, it's the other way around

You want the top rail to be solid and weighted so that it doesn't take a little touch of the foot to have it go flying. Sending a rail flying can easily cause it to get tangled in the horse's legs. You also want the rail to sting if the horse raps it with a foot, so he'll learn to be careful.
Logs make great jumps if you have any trees that need to be cut down. Wooden 4x4s, with corners cut off, is the norm for jump rails - strong, solid, heavy.
The last time I knew of someone putting a skinny pipe as a top rail (not an inexperienced rider or horse) the horse dinged the rail, it rattled off, and landed at an angle such that the horse impaled himself. Yes, truely.
That's not to say a horse can't break a leg if he raps a wooden rail hard enough to fly in front of him and tangle. But skinny metal poles don't belong with horses.