Thread: Cessna 421
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Old 03-17-2010, 09:33 PM
  #21  
ryan1234
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Joined APC: Jun 2008
Position: USAF
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Originally Posted by wizepilot View Post
If you have that many hours in the 421, then you would know it's manifold pressure you are changing (reduction), not RPM. Props generally stay set somewhere from 1700-1900 RPM all the time. Only time you would increase RPM (albeit temporarily) would be if you were flying high, very cold, for a long time. You have to exercise the hubs on the props with warm oil occasionally so they will respond when necessary.

To be honest with you I haven't really exercised the props at a cold, high altitude. Always wondered what the passengers would think?

Come to think about it.. maybe rightly or wrongly I was always taught to just leave the props (RPM) alone in the 421 even on the descent until below blue line.. or maybe not even at all

I really loved flying that airplane - even for a short time. Nice and smooth engines - although... call me a rookie... but you can certainly tell if one boosts slightly ahead of the other.
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