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They reason I thought of it is that aircraft propellers are supposed to be
phased in a certain way.
My Stearman has a 7 cylinder radial engine and when it has the Macaulay
hollow steel prop on it the prop goes in line with the master rod of the
engine (vertical) when cylinder 1 (top) is at TDC, but a wood prop is
installed 90 degrees from that, or horizontally when 1 is at TDC.
The wood prop and it's steel hub are maybe 30 pounds lighter than Macauley.
It's not lore, it's in the Type Certificate. And people have put props on
wrong and it's smoother once they remount then properly.
On May 18, 2021 4:56:44 PM Jim Franklin <jamesf@groupwbench.org> wrote:
> I can't think of a reason it would matter. Also, I think if it did, they'd
> have keyed it.
>
> jim
>
>
>> On May 18, 2021, at 5:52 PM, Karl Vacek <stearman809@gmail.com> wrote:
>>
>> Last time I sharpened my 21â?? walk-behind mower blade I thought of
>> something
>> thatâ??s never occurred to me, after using the same brand of mower for 25
>> years..
>>
>> On a Snapper, the blade can actually go on any way onto the square adapter
>> keyed to the crankshaft. The mounting point is square, no pins, no longer
>> side, nothing.
>>
>> One way would be aligned with the cylinder at TDC/BDC, and the other way
>> would be across. Itâ??s been off many times and thereâ??s no way to tell
>> how
>> it was mounted originally. The manual is silent on this.
>>
>> Power stroke shouldnâ??t matter, but maybe some dynamic issue one way or the
>> other?
>>
>> Thanks!
>> Karl
>> _______________________________________________
>>
>> Shop-talk@autox.team.net
>> Donate: http://www.team.net/donate.html
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<div dir=3D"auto">
<div dir=3D"auto">They reason I thought of it is that aircraft propellers a=
re supposed to be phased in a certain way.</div><div dir=3D"auto"><br></div=
><div dir=3D"auto">My Stearman has a 7 cylinder radial engine and when it h=
as the Macaulay hollow steel prop on it the prop goes in line with the mast=
er rod of the engine (vertical) when cylinder 1 (top) is at TDC, but a wood=
prop is installed 90 degrees from that, or horizontally when 1 is at TDC.<=
/div><div dir=3D"auto"><br></div><div dir=3D"auto">The wood prop and it's s=
teel hub are maybe 30 pounds lighter than Macauley. It's not lore, it=
's in the Type Certificate. And people have put props on wrong and it=
's smoother once they remount then properly.</div><div dir=3D'auto'><br></d=
iv>
<div id=3D"aqm-original" style=3D"color: black;">
<!-- body start -->
<div style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; line-break: =
after-white-space;" class=3D"aqm-original-body"><div style=3D"color: black;=
">
<p style=3D"color: black; font-size: 10pt; font-family: sans-serif; margin:=
8pt 0;">On May 18, 2021 4:56:44 PM Jim Franklin <jamesf@groupwbench.org=
> wrote:</p>
<blockquote type=3D"cite" class=3D"gmail_quote" style=3D"margin: 0 0 0 0.75=
ex; border-left: 1px solid #808080; padding-left: 0.75ex;">
I can't think of a reason it would matter. Also, I think if it did, they'd =
have keyed it.<div class=3D""><br class=3D""></div><div class=3D"">jim<br c=
lass=3D""><div><br class=3D""><blockquote type=3D"cite" class=3D""><div cla=
ss=3D"">On May 18, 2021, at 5:52 PM, Karl Vacek <<a href=3D"mailto:stear=
man809@gmail.com" class=3D"">stearman809@gmail.com</a>> wrote:</div><br =
class=3D"Apple-interchange-newline"><div class=3D""><div class=3D"WordSecti=
on1" style=3D"page: WordSection1; caret-color: rgb(0, 0, 0); font-family: H=
elvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; f=
ont-weight: normal; letter-spacing: normal; text-align: start; text-indent:=
0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit=
-text-stroke-width: 0px; text-decoration: none;"><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=3D"=
">Last time I sharpened my 21=E2=80=9D walk-behind mower blade I thought of=
something that=E2=80=99s never occurred to me, after using the same brand =
of mower for 25 years..<o:p class=3D""></o:p></div><div style=3D"margin: 0i=
n 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=
=3D""><o:p class=3D""> </o:p></div><div style=3D"margin: 0in 0in 0.000=
1pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=3D"">On a Sn=
apper, the blade can actually go on any way onto the square adapter keyed t=
o the crankshaft. The mounting point is square, no pins, no longer si=
de, nothing.<o:p class=3D""></o:p></div><div style=3D"margin: 0in 0in 0.000=
1pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=3D""><o:p cl=
ass=3D""> </o:p></div><div style=3D"margin: 0in 0in 0.0001pt; font-siz=
e: 11pt; font-family: Calibri, sans-serif;" class=3D"">One way would be ali=
gned with the cylinder at TDC/BDC, and the other way would be across.  =
;It=E2=80=99s been off many times and there=E2=80=99s no way to tell how it=
was mounted originally. The manual is silent on this.<o:p class=3D""=
></o:p></div><div style=3D"margin: 0in 0in 0.0001pt; font-size: 11pt; font-=
family: Calibri, sans-serif;" class=3D""><o:p class=3D""> </o:p></div>=
<div style=3D"margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calib=
ri, sans-serif;" class=3D"">Power stroke shouldn=E2=80=99t matter, but mayb=
e some dynamic issue one way or the other?<o:p class=3D""></o:p></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, s=
ans-serif;" class=3D""><o:p class=3D""> </o:p></div><div style=3D"marg=
in: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" c=
lass=3D"">Thanks!<br class=3D"">Karl<o:p class=3D""></o:p></div></div><span=
style=3D"caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14p=
x; font-style: normal; font-variant-caps: normal; font-weight: normal; lett=
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ne; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;=
text-decoration: none; float: none; display: inline !important;" class=3D"=
">_______________________________________________</span><br style=3D"caret-=
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text-stroke-width: 0px; text-decoration: none;" class=3D""><a href=3D"mailt=
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