First of all I want to say that I don't want to sound rude or look like I am talking down on you. After rereading my last posts I think that it may look like that but this is uninented and me not being a native speaker is responsible for that.
I was just using MRAP's as an example. The mine/IED protection levels probably won't need to be as high as that, but there are relatively easy design features to incorporate in a new build vehicle that will enhance protection without adding too much weight. I'm thinking of V-shaped hulls specifically here.
A good mine protection is possible to integrate into a wheeled medium weight vehicle. Actually wheeled vehicles have the advantage of being able to limb on when they run over a mine/IED even when they lose some of their wheels whereas a thrown track immobilizes a tracked vehicle completely.
I agree that getting the required protection etc. might be impossible at the weight I set, it could well be necessary to go higher than that, but a goal does need to be there, but perhaps one that is ok to break to meet other goals. The problem with saying that we won't be able to do this for that much weight is that no one has tried to do much of this for quite a long time. The BMP-1 and M113 are very old vehicles I think you'd agree? The vehicles (light tanks) that are intended to be replaced are very old. It might be that advances in armour technology (of which Britain is at the forefront) could make it more feasible than we think. It may not.
Sure one improved protection on older vehicles, designed new versions or put completely new vehicles into service.
And the history of tracked vehicles shows that they don't get lighter even with modern technologies.
The BMP-3, while offering a considerable better protection than the BMP-1, now weights round about 20 tons. And it is still one of the worst all around protected vehicles out there with no special mine resistance or even the ability to withstand a .50cal on the sides.
The CV90 grew heavier with every new version or mine protection kit and is now at the mentioned weight you criticize.
A Puma is going to offer what you seem to want. A heavy all around protection, good mine/IED protection, good mobility and a decent weapons loadout.
And all that on just 43 tons.
It certainly wouldn't be a cheap option, but I think that a new build vehicle could be a much better idea here those currently suggested. Or at least see what companies can come up with as prototypes trying to meet strict weight and protection parameters. I'm certain we'd get a lot closer to the vehicle we need than the current offers.
Finally, I think that the vehicle will end up with the new Warrior turret/gun so it's going to pack a punch either way. It just seems silly to be putting it on an IFV to effectively make another warrior with a new hull. But to be honest, i'd rather see that than a wheeled vehicle.
They may be quieter, but it still comes back to mobility for me. Who needs a nice quiet wheeled vehicle when it can only approach the enemy on nice flat, solid ground. (overstatement but you get the idea). A tracked vehicle certainly can do long range patrols and convoy protection, why would you say they can't? The current British vehicles have quite long unrefueled range.
With long range patrols I don't mean the typical lonely scouting mission against conventional enemy forces but the kind of long range missions the ISAF forces in A-stan perform. These are made up of relatively light wheeled vehicles where a tracked vehicle is not a good companion due to it being not able to do the same road marches like the rest of the group.
The same applies to convoy protection where the usual speed is even higher.
Tracked vehicles just wear down faster during such marches. And even while some tracked vehicles are able to go at relatively high speed everything above 50km/h is close to being panefull to the crew and will reduce their combat effectiveness very fast. And even these 50km/h roadmarches are no fun in a tracked vehicle.
You also cannot go over the argument of noise so easily. As we are talking about a recce vehicles who's main mission it still is to sneak into range of the enemy and spy on them I think it is very much needed.
From own experience I can say that one hears even a small tracked vehicle (Like a Wiesel or Bv206) at a considerable distance as a dismount. But one can get utterly surprised by a whistling wheeled vehicle.
I'm actually trying to work out now what it is you're advocating Waylander, could you clarify. You argue against tracked vehicles, but you also argue against the light weight. Then you say that it won't need to pack much of a punch and be silent. Right now I have to picture a LAV, covered in as much armour as can be bolted on, with a 50 cal. on top.
I never actually said that it doesn't need some punch and I think I gave decent examples of what I am advocating for.
And that is defenitely not an old LAV with a .50 cal on board.
I am talking about a modern wheeled IFV chassis (Like Piranha IV/V, Boxer or VBCI). The Piranha and the VBCI weight round about 23-26 tons with a turret on them (25-30mm gun).
A Boxer without a turret even weights 33 tons but offers considerable better protection.
One can reduce some of the capacity to carry dismounts to implement a retractable mast with modern optronics. Use the available mine protection kits (In the case of the Boxer it is already included, the others would become heavier than the basic versions) and maybe include an active defense system in the future (Like AMAP-ADS).
As you can see we have a vehicle here which nearly has everything you want. It is well armored all around (In case of the Boxer even more than some proper tracked IFVs), packs enough punch, is able to carry a small scout squad, has a good mobility, can be made to whistle and has the necessary tracking devices.
Even when wheeled you see that such a vehicle will weight 25 tons upwards. Make it tracked and it is going to be even heavier.
And it is far away from just being an old LAV with some add-on armor and a .50cal.
You set the goal of getting a vehicle in the 15-20 ton range and I just wanted to show that you don't get a decent protected vehicle with this weight, especially not when you want to have a tracked one.
The vehicles I mention are all very new and show what is possible these days. A totally new design is not going to offer more capabilities
And costs are crucial. As with all armed forces in europe the UK has to look for a solution as cheap as possible or otherwise we may not see any new vehicle entering service.
And sure in the end it comes down to you not wanting a wheeled vehicle.
What I want to argue for is that one shouldn't forget that it is going to be a recce vehicle.
You should ask yourself in which situations does a scout vehicle really needs tracks and when are wheels more handy. Naturally such a vehicle needs to get employed properly.