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Hi,
The "Aircraft 26" or "VM-26" -- "VM" for "Vladimir Myasishchev", of course -- was essentially an M-4 "Bison-A" with twin Dobrynin VD-5 turbojets instead of four AM-3A turbojets. Each VD-5 had a maximum thrust of 127.5 kN (13,000 kgp / 28,660 lbf) thrust. The VM-26 would have also had provision for two big rocket-assisted takeoff (RATO) boosters to help it get off the runway in heavily loaded condition.
An even more drastic variation on the basic "Bison" design was the "Aircraft 28" or "VM-28", which was considered in parallel with early M-4 development. The relatively small wing area of the "Bison" limited its altitude ceiling, which not only made it more vulnerable to interception but also reduced its cruise efficiency. The VM-28 featured a bigger with and four Dobrynin VD-5 turbojets, with an engine arrangement along the lines of the Boeing B-47 -- one engine on a pylon inboard on each wing, a second tacked on outboard under each wing, with the bicycle landing gear stowed in the bottom of the outboard engine nacelle. The VM-28 actually got as far as a full-scale mockup, but development of the M-4 seemed to be promising enough and the VM-28 got the axe in 1955.
The "Aircraft 26" or "VM-26" -- "VM" for "Vladimir Myasishchev", of course -- was essentially an M-4 "Bison-A" with twin Dobrynin VD-5 turbojets instead of four AM-3A turbojets. Each VD-5 had a maximum thrust of 127.5 kN (13,000 kgp / 28,660 lbf) thrust. The VM-26 would have also had provision for two big rocket-assisted takeoff (RATO) boosters to help it get off the runway in heavily loaded condition.
An even more drastic variation on the basic "Bison" design was the "Aircraft 28" or "VM-28", which was considered in parallel with early M-4 development. The relatively small wing area of the "Bison" limited its altitude ceiling, which not only made it more vulnerable to interception but also reduced its cruise efficiency. The VM-28 featured a bigger with and four Dobrynin VD-5 turbojets, with an engine arrangement along the lines of the Boeing B-47 -- one engine on a pylon inboard on each wing, a second tacked on outboard under each wing, with the bicycle landing gear stowed in the bottom of the outboard engine nacelle. The VM-28 actually got as far as a full-scale mockup, but development of the M-4 seemed to be promising enough and the VM-28 got the axe in 1955.
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