If size was the only issue, there would be no need for the Mi-6/26.
The fact that you talk about the Mi-6 and the Mi-26 like they are the same aircraft is amusing because the Mi-26 has twice the weight capacity of the Mi-6...
They had a use for Mi-6 aircraft but it has been replaced by the Mi-26... which they are going to be fitting with brand new engines... there is no point in now funding the Ka-102 which will have less payload capacity to replace something that is already working.
They are working with China on a 10-12 ton capacity helicopter... if anything useful comes out of that it would make more sense to use that... but honestly I really don't see an urgent need for a new type.
If they need to move 10 tons they could rig up the Mi-26 to carry the 10 tons but also to carry an extra 10 ton fuel bladder to extend flight range... but they don't even seem to want to bother doing that.
They don't want to spend extra $ on completely new heavier helos, & the CH-53D /47 F can still be upgraded
They print their own money... if they don't want to spend money on heavier helos and would rather upgrade ones they already have for any job then why on earth would Russia be pissing away money it has to earn and can't just print willy nilly on tilt rotors and shit when they have decided to invest in high speed helicopters?
More of them can be built to make up for less payload.
Big helicopters are expensive to buy and expensive to operate... you don't just buy a few extra on a whim.
Besides, they have more airfields for planes than Russia.
Siberia is flat open territory... Russia could have more airfields than planes... most human settlements would massively benefit from having an airfield.
75 million dollar tiltrotors would never become commercially viable even if maintenance was free...
It would be cheaper and easier to have rail hubs around the place and airfields along the rail lines to fly small planes out to settlements with short airstrips. Small settlements wont need Il-96 levels of cargo capacity... and even if they do.... say a coal mine... a rail link makes much more sense.
It'll be a high speed tandem helo with comparable max speed of the V-22B .
Of all the new designs they are suggesting it is the one I like least...
It's less risky & costly than a tilt-rotor & has a bigger cabin than coaxials.
The Mi-6 and Mi-26 have the biggest cabins and they are not tandems. A coaxial helicopter can have any sized cabin, but even a tandem design will need tandem coaxials if you want it to be fast because of retreating blade stall issues.
It's possible to build large cargo tilt-rotors as well:
If and possible are useless words.... it would be possible to make it the most expensive aircraft project ever, but that does not make it a good idea.
According to Flateric that is the case... remember the picture f the mock-up we saw some time ago? He says there are propellers on a rack next to it
I had hopes for that but had not seen the evidence or rather didn't have the background to interpret it correctly...
They said the new design has to fit into existing hangars and use existing equipment for storage and operation of the current models... which means that after everything is folded up it has to fit into the same size as the current helos.
It will likely have new blades, a more aerodynamic shape, more powerful engines, and a pusher propeller, but other than that we will have to wait and see.
It can't be a tandem because a tandem wont fit and it can't be a tilt rotor because it has its blades side by side and it wont fit either...