Thanks! I always thought Jambiyas and Khanjars were basically the same dagger but with different decorations, but these two are really quite different.
The Jambiya is quite flat. It doesn't fill your hand up at all and I don't think you could weild it very effectively in a fight. This may because it's a newer blade that was made for comfort of wear rather than as a weapon. Or it may be because the Jambiya is worn behind the belt so it has to be flat to not press your gut in.
The Khanjar hilt is much thicker and more barrel like. Even with all the ornamentation on the grip you could still use it comfortably. All the decorative bits are firmly attached, I scrubbed the hell out of that thing and I didn't manage to knock anything off. And considering that the hilt sustained some massive damage yet didn't lose any ornamentation, I think it could withstand about anything.
The Jambiya blade is much wider and more "boomerang" shaped. The Khanjar blade is more like a claw. If you sharpened both edges on it I think it'd be an effective, efficient little weapon. If you stabbed somebody down to the hilt, you'd leave a huuuuge hole in them. You could also do some nice slashing.
Basically, the khanjar is a weapon and the Jambiya is a weapon shaped fashion accesory. This might be more because the khanjar is much older. Maybe older jambiyas are more weaponesque
What confuses me most about these kinds of daggers is that they seem massively wasteful. They take up a ton of space and weigh a ton, yet you only get 5 or 6 inches of reach with them. If you took the same weight and put it into a thinner blade with a lighter hilt and scabbard, you'd have a nice 10 inch dagger. It seems to me that having twice the reach would be more useful than twice the width. Plus, nomads wore these things. Why would they carry so much extra baggage with them?
My first guess is that they were made this way for stylish reasonsbut what if there was some tactical advange? Am I missing aomething? Supposedly these blades were derived from animal skinning blades. I can see that from the shape, but who on earth would skin an animal with a double edged blade?? They may have also been used by Omani sailors, so maybe they needed close quarters weapons