Re: Unducted fans?

From:         king@ukulele.reasoning.com (Dick King)
Date:         10 Jan 94 16:12:05 PST
References:   1 2 3
Followups:    1
Next article
View raw article
  or MIME structure

In article <airliners.1994.849@ohare.Chicago.COM> nordstrom@meediv.lanl.gov (Carl Nordstrom) writes:
>
>[Pratt & Whitney's unducted twin fan had a gearbox.  GE's simply powered one
> fan off a turbine rotor and the other off a "stator"]

I understand, however, that the ratio of the two prop rows' speeds needs to be
carefully controlled to avoid particular wrong ratios that lead to bad
resonance.

How was this speed ratio maintained, in the GE design?

-dk