Garry, it is still to be understood if the new il-106 will be a an-22 replacement, as the original project from the 90s, or a modernised An-124 under another name to avoid IP issues
Well without a proper replacement like the Il-106 would have been if it was put into production in the 1990s, the replacement for the An-22 was pretty much the An-124 by default as no other aircraft could manage.
I very much suspect the Il-106 would be scaled to be like the An-124 for all the same reasons the Il-276 is scaled to the same internal cross section of the Il-476 but not in length obviously.
I rather suspect when the Il-106 enters production and service its engines will be ready and similar or the same engines could be used to upgrade the An-124 so it can soldier on a few more years as the engines were the main problem with everything else being Russian made anyway.
I read that it will have the same cargo hold size as the An-124, front and rear ramp (the front loading was not an option for the original project) and 4 modern turbofan with 24 tons of thrust (PD-24). The D-18T engine of the An-124 has a max takeoff thrust of 23.6 tons, while the proposed engines for the "original" il-106 were supposed to have a max takeoff thrust of about 18tons.
Having a big internal hold is good for low density loads, where space is more of an issue than weight.
If they fit the PD-24 to this aircraft it will reduce running costs compared with the bigger more powerful PD-35 they might put on the An-124 and its replacements.
This will make the Il-106 cheaper for 80-90 ton payloads and presumably in emergencies they could offload 20 tons of fuel can carry 110-120 ton payloads with inflight refuelling to recover range if required, just to make them flexible.
Normally 120 ton and bigger payloads from overseas would be carried by the An-124 which in the current models can carry 150 tons and with PD-35 engines could probably manage rather more.
Later we could also see the "Slon", but that would be an airplane quite larger than the An-124, and, if it will have 4 PD-35 engines it will have the same thrust as a 6 engines An-225.
Fitting PD-35s to the An-124 or even PD-24s to the An-124 could be a stopgap while they work on improved aircraft designs of different shapes and layouts... perhaps a scaled up Il-106, or perhaps something different...
PD-24 and PD-35 actually sorts out their issues with the An-124 because they make everything now except the engines anyway, so they could take a bit more time to look at what they want to replace it with.
I am sure a lot of countries would be happy to take ex-Russian military An-124s with all russian components and buy some new Russian engines to put in them when the Russian military decides on a new aircraft to replace them.
Maybe they want to restart the Tu-330 project to carry relatively light items wider than what allowed by the il-76. (The cargo old of the il-76 is longer but narrower than that of Tu-330 and An-70)
Certain payloads and military forces might do better with the extra width... why not...
The An70 is dead and the A400M seems to have problems even to this day, so an alternative in that field wont hurt.
Would be good practise for Tupolev too... they might expand it into different families too... but perhaps go down instead of up.
you simply can't start building Il-106s until your Il-76/276 line is "humming" … you will go broke
and don't forget everything you learn there will help with the Il-106 later
The Il-106 was developed in the 1990s and if there had been the money it would have been flying for over 20 years by now... it is also a rather bigger aircraft... this is an An-22 replacement so it is An-22/An-124 sized aircraft... it likely wont be made in the same factory as the Il-476 or Il-276...
the Il-106 Achilles Heel …. is that there is no existing engine for it … PD-35
so there is no way the Il-106 would be done before the Il-276 …. its impossible
The PD-14 engine for the Il-276 and Il-476 is not ready yet either, so they will start life with PS90s.
and they want to get their Il-76 new build line up to 12 p.a. then towards 18 by the look of it …
Il-476 production is a bit slow, so if they are going to add Il-276 production to the same line in 2023-2024 then they will need to expand production.
These two aircraft are much smaller than the Il-106... the Il-106 is slightly smaller than a C-5 galaxy and the Il-476 is a C-141 and the Il-276 is a big C-130...
I'm coming around to Garry's POV …..
4 x PD35s = 140
8x PS90s (ie 14-15) = 120 ….. not a lot of difference re early flight tests
you would be doing at least 2 years of flight testing with a new airframe …..
I think 8 would be a bit excessive... the PS90 is something like a 16 ton thrust engine, and the engines for the Il106 are 24 ton thrust engines, so double the number of engines would be too much.
the Il-106 is conceptually an An-22, but in improved version so it could be closer to an An-124 if needed.
Currently those An-124s have four 23 ton thrust engines, so four PD-18 engines might not be that bad to start with for the Il-106... it would be a bit underpowered to be a An-124 replacement... but it isn't... it is an An-22 replacement.
Even 120 tons of thrust would be excessive for the Il-106... as I said the current An-124 has four 23 ton thrust engines... which is only 92 tons thrust.
The An-225 is the 250 ton capacity Buran carrier and it has six 23 ton thrust engines giving it 138 tons thrust... but it needs that for enormous bulky external load that it carries for the space industry... an Il-106 and An-124 replacement wouldn't need such power... it would shorten their range... their takeoff performance would be good though.
The real problem is engines and what can be available when and which factories can be used for production.
Personally I think ramping up Il-476 production is the first priority because once the new engines for it are ready then they can make Il-276 aircraft on the same lines as you mention... but that will reduce Il-476 production so they need to start making more of them now to compensate that in the future production will go down while they make replacements for the An-12.