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For Amsteel Blue: http://www.samsonrope.com/index.cfm?rope=192

They will lose the third world market completely as soon as the Defender goes. And as Rob says, they'll lose the rest becase they are a SUV company in a world that increasingly doesn't want SUVs. Land Rover falls between two stools, because they make class-leaders in off-road performance (by...

I know a fair bit about Mattracks and track-conversion systems in general - I have a strong interest in the subject, including financially. Mattracks cost about $25-$55K per set, depending on which models you want. Some of them are plumbed into your power-steering system to provide power some...

If anyone on this forum wants to buy some, PM me and I'll be happy for you to buy them on eBay and to have them sent to my address (I live in the UK). I'll send them on by whatever metod you like, and you can pay me the costs via Paypal. I may want a similar favour for US purchases sometime...

Yes, I'd try a winch or a tow-rope first. I'd use a KERR (in some circumstances) if there were no winch, adequate winch anchor, or sufficient snatch blocks. Even then, I'd explore the alternatives, such as jacking, digging, etc. When you most need the power of a KERR is unfortunately when it's...

What does that mean, Scott?

No, I think both James and I were very specific about the limitations of the calculations. Apart from the mental stimulation, it is often useful to calculate something using a simplified model, and then discuss the upwards- or downwards-effect of real-world complexities. At least you start off...

When the pump comes back on, there will be a rush of steam? And quite a bit of it, I should imagine.

It seems to me you may be a victim of your own success - if the system is very effective you will soon find you have your entire tank of water at 100 deg C (or whatever you regulate it at). Won't you have a problem with the water still in the exhaust at 500 deg? Surely you'll have to actively...

I presume you mean when it reaches the end of the slack! For your energy equation to hold good, the truck must freewheel (frictionlessly, of course), so that it is using only its known kinetic energy at the end of the slack. If, as in the real world, the driver continues to apply throttle, then...

It's interesting that Amsteel rate that sling at only 60% of the rope strength! It's not obvious to me where it would break, either, unless the sling was used around something small in diameter.

Definitely, a rope/strap should be designed for kinetic recovery if it is to be used for thaat purpose! Not only that, but it should be roughly matched to the weight of the recovery truck. Too little stretch will impart too much force and just break something. The whole idea of a kinetic strap...

Cunningly, I (expressly and magically) assumed away these problems, as well as another couple of issues, for the purposes of my calculation... :) I defined the stretch as linearly decelerating that weight of truck, at that initial speed, over the given distance of the stretch. I suppose in...

Is there any advantage to using the exhaust compared to using the coolant? It sounds complicated to make use of the heat compared to a water/water HE. The advantage of the coolant is that it is at a pretty well regulated temperature - the exhaust gases change temp a lot, and will lose heat very...

On thinking about it, I suppose everything breaks when it stops stretching! I would guess that the stretch % must be the amount the rope is designed to stretch, at its rated capacity. Any futher force on the rope may stretch it a bit more, but will start to damage it? I wait with bated breath...

Does he freewheel when he comes to the end of the slack, or does he continue to use the throttle? (I'll assume he freewheels). How long is the rope? (I'll assume 10m). I'll also assume the strap stretches exactly by its 20% with that mass and velocity, and that the stretch decelerates the truck...

Fail, as in "break", or fail as in "stop stretching"?

I'm assuming a set means "a matching crownwheel and pinion", and not "a set of matching crownwheels and pinions for your Land Rover"? Sadly :) KAM has a great reputation in the UK, btw.

Looking at the scenario in the You-tube video that muskyman posted, I think the best use for your safety-line would be to tether all those guys to a tree far away! :) More seriously, tethering is worth thinking about, especially if there are suspect components. I've seen chain being used with a...

What I meant about extra slack was in response to your older post, above: If you have 2m of slack, and you use it to accelerate to speed X, and on the next run, you leave 4m of slack, and still only accelerate to speed X, then the forces generated will be the same. The purpose of more slack is...