Prop Question - Page 2

Flying EMT · #11 03-30-2009, 07:51 AM

Rich, You said you were at 77,000. What was the density altitude? At this colder time of the year, you cold have been at a density altitude of only 5 K. You gotta get that OAT hooked up. Just a thought. -Ben

RFazio · #12 03-30-2009, 11:01 AM

I guess I wasn't thinking about what was happening correctly. It makes sense that at higher altitudes your going to get the same RPMs even with lower power. It is easier for the engine to turn the prop in the thinner air as it is easier for the plan to go faster. So less power shows the same numbers, air speed and RPM, at higher altitudes. I will check my manifold pressure as well as outside air temp next time out.

P.S. I'm up to 30 hours in phase one. I have next week off so I should be able to finish it up. Thanks again.

RFazio · #13 03-30-2009, 03:04 PM

Your right Ben, it just means I have to try it again. I need to bring a pad to right down all the info.

664781 · #14 03-31-2009, 10:12 AM

Richard,
I have the same prop and get 2350 static and only 2600 at altitude. Sounds like we are real close.....

RFazio · #15 03-31-2009, 12:34 PM

Kurt, I wanted to check my tach just to see if it was close. My friend Ben ( Flying EMT ) had a hand held prop RPM counter, thingy. I pointed it at the prop from the cockpit while flying. It matched my gauge exactly at all RPMs. So I'm pretty sure my tach is real close.