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Thread: An-70 and propfan question

  1. #1
    Join Date
    Jan 2000
    Location
    San Francisco, USA
    Posts
    880

    An-70 and propfan question

    Why is the Progress D-27 a propfan when TP400 a turboprop? Both have swept propellers of comparable diameter. D-27 being 4.5 meters while TP400 is 5.3 meters. Is it the counter rotating props? In which case why is Kuznetsov NK-12 not a propfan?

    A propfan should offer speed advantage over turboprops right? But A400M with TP400 is faster than An-70 even though it has lower power to weight ratio and lower output.
    Last edited by Multirole; 11th July 2018 at 06:38.

  2. #2
    Join Date
    Dec 2009
    Location
    Southern Ontario, Canada
    Posts
    180
    Is the prop on the DP-27 directly driven from the turbine shaft ?
    IOW, basically a ductless turbofan ?

    That is what I consider the difference, a turboprop uses a transmission between prop and turbine shaft.

    Or is it just marketing hype ?

  3. #3
    Join Date
    Jan 2000
    Location
    San Francisco, USA
    Posts
    880
    It does have a reduction gearbox

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