Please explain.
That appears contrary to the PHAK.
I do explain this concept to students only because such a question could come up; usually during observance of preflight when the DPE finds ideal moments to quiz the candidate.
And, ditto on not using this DPE again.
I just reviewed the PEAK, and on page 3-23 we read this tidbit: ""...propeller blades are twisted to change the blade angle in proportion to the differences in the speed of rotation along the length of the propeller and thereby keep thrust more nearly equalized along this length."
Whether the tips provide the majority of thrust or not, is a debateable question.
(Reminds me of my CFI ride when the FAA dude was telling me what the air pressure should be in the nose strut of an A36 Bonanza -- and airplane he had admittedly had
never flown -- and one which I knew in great detail).
I would have answered "it depends on the angle of the blade and the airspeed...."
If he would have "corrected" me, I would have quoted this section of the PEAK.
Other things....
Then the DPE was doing unusual attitudes, he set the airplane at "about 50 degree bank" and the airspeed at 180 MPH (redline in this bird is 200 and 150+ is yellow arc. Va with 2 aboard is 130 MPH).
The Dead Reckoning, Pilotage isue: The student flew a heading then intercepted an interstate. When the DPE asked "Where are you?" the student quickly pointed out towns, towers, and roads. He ended up exactly where he planned to go.
Then the DPE said "Diversion: Take me to Youngstown."
So the student dutifully looked at the sectional, eyeballed a heading, and turned to that heading.
"Why aren't you using VOR?"
"You said you wanted me to use dead reckoning and pilotage."
"Use the VOR."
The student set up the Youngstown VOR in Nav 2, but pressed Nav 1 on the audio. Duh.
They flew to Youngstown VOR. The airport is a stone's throw. Student planned on flying to VOR, then calling up Youngstown tower.
"Why are we here? We're supposed to go to Youngstown
Airport."
During the oral, "What's the best altitude and airspeed for this airplane?"
Student said, "8,500 feet."
"OK"
I explained to the student that it's not just the altitude we happen to fly at most of the time, but that "best" should have been qualified -- shortest time? Lowest fuel burn? What are the winds? And so on.
Plus, with normally aspirated airplanes, the "optimal" altitude is pretty low. We normally climb above 4,000 to get out of the bumps or avoid the towers on the ridges and maybe catch a tailwind.
Student said he nailed Steep turns, stalls (power off only, no turning stalls), emergency procedures, takeoff, some of the nav, and most of the oral.
The debate over altitude to fly turns about a point got him flustered, I think, so maybe after that concentration started going south.