infotango
Line Up and Wait
So I have always been told to cruise a 172 at 2300 RPM which seems like a crummy idea, since that power will result in a varying fuel flow with altitude and a different true airspeed with altitude.
I have noticed that when I set the factory recommended RPM setting for altitude at a power setting of 65 percent power I almost always notice 105 indicated. So I'm thinking that flying with whatever cruise power nets me 105 indicated in level flight will always result in a power setting of roughly 65 percent power, (and the resulting predictable fuel flow). Using IAS as an airspeed setting also seems to make flight planning much easier, I now simply use that speed and convert to TAS on the whiz wheel.
My question is, is this flawed logic? Will I always, in fact, be running the engine on the 172 at 65% if I follow this manner of setting cruise power in level flight?
I have noticed that when I set the factory recommended RPM setting for altitude at a power setting of 65 percent power I almost always notice 105 indicated. So I'm thinking that flying with whatever cruise power nets me 105 indicated in level flight will always result in a power setting of roughly 65 percent power, (and the resulting predictable fuel flow). Using IAS as an airspeed setting also seems to make flight planning much easier, I now simply use that speed and convert to TAS on the whiz wheel.
My question is, is this flawed logic? Will I always, in fact, be running the engine on the 172 at 65% if I follow this manner of setting cruise power in level flight?