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These are both two blade props? I would love to know why it makes a =
difference. Especially that the two props get mounted differently.
jim
> On May 18, 2021, at 6:49 PM, Karl Vacek <stearman809@gmail.com> wrote:
>=20
> They reason I thought of it is that aircraft propellers are supposed =
to be phased in a certain way.
>=20
> 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.
>=20
> 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.
>=20
> On May 18, 2021 4:56:44 PM Jim Franklin <jamesf@groupwbench.org> =
wrote:
>=20
>> I can't think of a reason it would matter. Also, I think if it did, =
they'd have keyed it.
>>=20
>> jim
>>=20
>>> On May 18, 2021, at 5:52 PM, Karl Vacek <stearman809@gmail.com =
>>>=20
>>> 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..
>>> =20
>>> 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.
>>> =20
>>> One way would be aligned 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.
>>> =20
>>> Power stroke shouldn=E2=80=99t matter, but maybe some dynamic issue =
one way or the other?
>>> =20
>>> Thanks!
>>> Karl
>>> _______________________________________________
>>>=20
>>> Donate: http://www.team.net/donate.html =
<http://www.team.net/donate.html>
>>> Suggested annual donation $12.96
>>> Archive: http://www.team.net/pipermail/shop-talk =
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>>>=20
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>=20
>=20
> _______________________________________________
>=20
> Shop-talk@autox.team.net
> Donate: http://www.team.net/donate.html
> Suggested annual donation $12.96
> Archive: http://www.team.net/pipermail/shop-talk =
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>=20
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>=20
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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;" class=3D"">These=
are both two blade props? I would love to know why it makes a =
difference. Especially that the two props get mounted differently.<div =
class=3D""><br class=3D""></div><div class=3D"">jim<br class=3D""><div><br=
class=3D""><blockquote type=3D"cite" class=3D""><div class=3D"">On May =
18, 2021, at 6:49 PM, Karl Vacek <<a =
href=3D"mailto:stearman809@gmail.com"; =
class=3D"">stearman809@gmail.com</a>> wrote:</div><br =
class=3D"Apple-interchange-newline"><div class=3D"">
<div class=3D"">
<div dir=3D"auto" class=3D"">
<div dir=3D"auto" class=3D"">They reason I thought of it is that =
aircraft propellers are supposed to be phased in a certain =
way.</div><div dir=3D"auto" class=3D""><br class=3D""></div><div =
dir=3D"auto" class=3D"">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.</div><div dir=3D"auto" class=3D""><br =
class=3D""></div><div dir=3D"auto" class=3D"">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.</div><div =
dir=3D"auto" class=3D""><br class=3D""></div>
<div id=3D"aqm-original" style=3D"" class=3D"">
<!-- 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"" class=3D""><p style=3D"font-size: 10pt; font-family: =
sans-serif; margin: 8pt 0px;" class=3D"">On May 18, 2021 4:56:44 PM Jim =
Franklin <<a href=3D"mailto:jamesf@groupwbench.org"; =
class=3D"">jamesf@groupwbench.org</a>> wrote:</p>
<blockquote type=3D"cite" class=3D"gmail_quote" style=3D"margin: 0 0 0 =
0.75ex; 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 class=3D""><div class=3D""><br class=3D""><blockquote =
type=3D"cite" class=3D""><div class=3D"">On May 18, 2021, at 5:52 PM, =
Karl Vacek <<a href=3D"mailto:stearman809@gmail.com"; =
class=3D"">stearman809@gmail.com</a>> wrote:</div><br =
class=3D"Apple-interchange-newline"><div class=3D""><div =
class=3D"WordSection1" style=3D"page: WordSection1; caret-color: rgb(0, =
0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; =
font-variant-caps: normal; font-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: 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: =
Calibri, sans-serif;" class=3D"">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.<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: Calibri, sans-serif;" class=3D"">One way =
would be aligned 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: Calibri, sans-serif;" class=3D"">Power =
stroke shouldn=E2=80=99t matter, but maybe 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, sans-serif;" =
class=3D""><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"">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: 14px; font-style: normal; =
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normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
text-decoration: none; float: none; display: inline !important;" =
class=3D"">_______________________________________________</span><br =
style=3D"caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: =
14px; font-style: normal; font-variant-caps: normal; font-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;" class=3D""><br =
style=3D"caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: =
14px; font-style: normal; font-variant-caps: normal; font-weight: =
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text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; text-decoration: none;" class=3D""><a =
href=3D"mailto:Shop-talk@autox.team.net"; style=3D"color: rgb(149, 79, =
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