Originally Posted by RV8JD
With Van's redefining Vne in terms of TAS, my RV-8 with a YIO-360-M1B will exceed its Vne of 230 MPH TAS if I don't bring back the power in a descent. Van's (possibly conservative) redefinition of Vne in terms of a constant TAS value at all altitudes, limits the RV-8's downhill performance.
Note where Redline is (in terms of MPH IAS) in the screenshots below, at much less than 75% power.
400 FPM descent at 9800':
600 FPM descent at 16,120':
Sorry for the thread drift!
Of course you have to observe all operating limits -but you descend at speed, throttling back just enough to observe Those limits, and get a nice fast ride downhill - you donít have to pull all the power off to where youíre worried about cooling in order to lose 10,000í in 60 miles....
Paul F. Dye
Editor in Chief - KITPLANES Magazine
RV-8 - N188PD
RV-6 (By Marriage) - N164MS - "Mikey"
RV-3B - N13PL - "Tsamsiyu"
A&P, EAA Tech Counselor/Flight Advisor
Dayton Valley Airpark (A34)