rv10flyer(at)verizon.net
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 Posted: Wed Jun 13, 2012 3:27 pm Post subject: No Title |
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I generally go out and rev the engine to 2000 than do a prop check 5-6 times, I figure it’s like revving a engine on a vette, I want people to know I have a high powered engine!!
Seriously though, there is a fellow friend and RV-10 who always makes a comment about students doing three prop checks before takeoff, when once is enough. They’re rentals, who cares!
Here is a piece from Avweb:
How many times should you cycle the prop? If the RPM drops smoothly and properly, once is enough. The fresh oil will probably cause the piston to move a good deal and when it comes back to the low pitch stops, most of the "old" oil will be pushed out. If you really want to feel good, do it twice, to get even more of that "old" oil out of there. Three times is gross overkill, in my opinion, but a lot of people do three times, or more. In reality, there are tiny bleed holes that allow a constant flow of warm oil to both sides of the prop piston, so even if you take off with cold oil in there, it will quickly be replaced with nice slippery warm stuff. On some of the big old props on the radials, in extreme Arctic conditions, the oil would congeal faster than the bleed ports could replace it, but I doubt you'll find any modern props with this problem. I should note for completeness that many of the props on the big radials might require many more cycles to achieve a smooth RPM drop when cold. In freezing temperatures, it may take up to ten cycles. There's a lot more to the mechanism, and a lot more oil involved.
Link for the full version http://www.avweb.com/news/pelican/182082-1.html
From: Roger Standley (taildragon(at)msn.com)
Sent: Wednesday, June 13, 2012 9:53 AM
To: rv10-list(at)matronics.com (rv10-list(at)matronics.com)
Subject: Re: Re: Mystery Oil Leak (solved)
After checking mags at 1800 rpm, I reduce rpm to 1400 for the prop check. A&Ps I talk to suggested it. Anyone else doing that?
Roger
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