Russia is developing a promising PD-35 aircraft engine, which may be useful for a new passenger wide-body airliner. Expert Sergey Marzhetsky shared his thoughts on the future aircraft, but suggested using three engines instead of the traditional two.
Three Instead of Two
According to him, very high hopes are pinned on the promising PD-35 in Russia. Without it, it is impossible to create either a competitive wide-body long-range airliner or a military transport aircraft to replace the aging An-124 Ruslan.
Apparently, in this corrected PD-26 project, technologies developed on the PD-35 will be widely used, and a less powerful engine can really be obtained by 2030. The question is, where can it be put, where can it be put.
According to Marzhetsky, the PD-26 could replace the Ukrainian D-18T series 4 engines with a thrust of 25,400 kgf, which were installed on the An-124.
This would make it possible to really revive the production of a domestic analogue of the Ruslan in Russia, which can only be welcomed. But things are more complicated with a wide-body civilian airliner.
Don't Waste Time and Resources
Marzhetsky noted that the thrust of only two PD-26s for a long-range aircraft would not be enough, and four would be excessive and economically impractical.
Therefore, I would like to draw attention to the technical solutions already used by Western competitors to solve this problem. In particular, we can recall the American Lockheed L-1011 TriStar and McDonnell Douglas DC-10 airliners, which were built according to a three-engine scheme.
One engine was installed under each semi-wing, and the third was at the base of the keel. Three is worse than two, but better than four.
Perhaps, Marzhetsky is sure, it makes sense to start developing a modern wide-body airliner right now specifically for the PD-26 and specifically for the three-engine scheme, so that you don’t have to do the same thing later, but spending precious time and resources on it.
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