I recall something about harmonics and power pulses. For
hand propping, the blade angle should be such that you bring
the piston to TDC with the blade above the shoulder so you
can pull it through as you step back, when hand propping a
plane with a starter, the piston is at TDC with the blade
angle lower and the person is more likely to be in a
position to fall into the prop rotational plane.


Of course, I could have made it all up or simply remembered
some details, IF I cared I'd look up the answer in one or
more texts/web pages from a reliable source.



--
James H. Macklin
ATP,CFI,A&P

--
The people think the Constitution protects their rights;
But government sees it as an obstacle to be overcome.
some support
http://www.usdoj.gov/olc/secondamendment2.htm
See http://www.fija.org/ more about your rights and duties.


"Roy Page"
wrote in message
ink.net...
| Jim, we learn something every day !
| Is there a reason that the 2 blade prop is aligned with
the crank throws ?
|
| --
| Roy
| N5804F Piper Archer
| "I have had some bad landings but I have never missed the
runway"
|
|
| "Jim Macklin" wrote
in message
| news:y9nuf.38976$QW2.20013@dukeread08...
| Airplanes without starters have the prop indexed for
hand
| propping, engines with starters have the blades on a two
| bladed prop aligned with the crank throw.
|
|
| --
| James H. Macklin
| ATP,CFI,A&P
|
| --
| The people think the Constitution protects their rights;
| But government sees it as an obstacle to be overcome.
| some support
| http://www.usdoj.gov/olc/secondamendment2.htm
| See http://www.fija.org/ more about your rights and
duties.
|
|
| "Mike Granby" wrote in message
|
oups.com...
| |
| | Why are fixed-pitch props on PA-28s indexed to the
10-4
| position from
| | the front?
| |
| | a) To help hand propping?
| | b) To minimize vibration?
| | c) To improve performance?
| |
| | My money is on (a) but others disagree.
| |
|
|
|
|