REFLECTOR:CONFUSION

Wed, 16 Jul 2003 01:13:07 -0400

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A lot of what Alan has relayed sounds reasonable, but that does not mean =
that you will be happy with the performance of a one-speed bicycle, no =
matter how strongly developed your leg muscles.  A constant speed =
propeller allows the engine to develop more horsepower on takeoff, which =
in turn offers maximum performance.  Also, a constant speed propeller =
offers better fuel economy and it can also be used as a drag device in =
descents.  A constant speed propeller, when placed in the low rpm =
setting during emergency power-out situations also improves the =
aircraft's glide ratio ... considerably.  On the flip side, constant =
speed propellers cost about 5-times what a fixed pitch propeller will =
cost, not including a governor ... so price does become a factor.  The =
weight savings of a fixed pitch propeller is not, in my opinion, reason =
to select one over the other.  Cooling works well with either type of =
propeller.  Most Velocity pilots, I would say, wish for a constant speed =
propeller if price were not a factor.  I personally think the decision =
boils down to $$ budget and how badly you long for the improved =
versatility of performance.
Scott B.
  ----- Original Message -----=20
  From: Tom Martino=20
  To: reflector@www.tvbf.org=20
  Sent: Wednesday, July 16, 2003 12:06 AM
  Subject: REFLECTOR:CONFUSION

  You know what they say about opinions?  They're like Assh---s ... =
everybody's got one!  My problem is ... they're all different.

  =20

  I have a 173 Elite RG with an IO-540 engine.  I just spoke to Alan =
Shaw and he swears that a constant speed prop is NOT necessary.  He says =
the added weight is not worth it and it will actually cut down your =
cruise speeds a bit.  He said climb performance won't be a problem with =
that engine ... and the Velocity will be better off without the extra =
weight back there.

  =20

  He recommended a three-blade performance prop made by Performance =
Props in Arizona.  He said it should be put on a five inch extension and =
it will fit perfectly with the cowl he designed.

  =20

  He said the fixed pitch also helps with cooling because it can get =
closer to the big cowl openings on each side of the prop and it will =
actually "suck out" air creating a cooling effect.

  =20

  He also said that the exhaust pointing straight out the back through =
two ports (bottom left and right) will actually cause a venturi effect =
inside the cowl ... which will force cool air to exit around it - again =
aiding in the cooling of the engine.

  =20

  He talked for a long time and sounded completely confident and =
knowledgeable. =20

  =20

  Since his advice seems to be contrary to a lot of other opinions ... =
my question to you is this:

  =20

  DOES IT SOUND REASONABLE?

  =20

  I am getting to a point where I need to make some decisions.  Any =
feedback will be appreciated.  The discussions I have seen here are very =
intelligent and I want to take advantage of your BRAINS.

  =20

  Thanks in advance.

  =20

  Tom Martino

  www.troubleshoter.com=20

  =20

  =20

  =20

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<DIV><FONT face=3DArial size=3D2>A lot of what Alan has relayed sounds =
reasonable,=20
but that does not mean that you will be happy with the performance of a=20
one-speed bicycle, no matter how strongly developed your leg =
muscles.&nbsp; A=20
constant speed propeller allows the engine to develop more horsepower on =

takeoff, which in turn offers maximum performance.&nbsp; Also, a =
constant speed=20
propeller offers better fuel economy and it can also be used as a drag =
device in=20
descents.&nbsp; A constant speed propeller, when placed in the low rpm =
setting=20
during emergency power-out situations also improves the aircraft's glide =
ratio=20
... considerably.&nbsp; On the flip side, constant speed propellers cost =
about=20
5-times what a fixed pitch propeller will cost, not including a governor =
... so=20
price does become a factor.&nbsp; The weight savings of a fixed pitch =
propeller=20
is not, in my opinion, reason to select one over the other.&nbsp; =
Cooling works=20
well with either type of propeller.&nbsp; Most Velocity pilots, I would =
say,=20
wish for a constant speed propeller if price were not a factor.&nbsp; I=20
personally think the decision boils down to $$ budget and how badly you =
long for=20
the improved versatility of performance.</DIV>
<DIV>Scott B.</DIV>
<BLOCKQUOTE dir=3Dltr=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
 <DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
 <DIV=20
 style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black">From:=20
 <A title=3Dtmartino@troubleshooter.com=20
 href=3D"mailto:tmartino@troubleshooter.com">Tom Martino</A> </DIV>
 <DIV style=3D"FONT: 10pt arial">To: <A =
title=3Dreflector@www.tvbf.org=20
 href=3D"mailto:reflector@www.tvbf.org">reflector@www.tvbf.org</A> =
</DIV>
 <DIV style=3D"FONT: 10pt arial">Sent: Wednesday, July 16, 2003 =
12:06=20
 AM</DIV>
 <DIV style=3D"FONT: 10pt arial">Subject: =
REFLECTOR:CONFUSION</DIV>
 <DIV> </DIV>
 <DIV class=3DSection1>
 <SPAN=20
 style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">You know what they say =
about=20
 opinions?&nbsp; They=92re =
like Assh---s=20
 ... everybody=92s got one!&nbsp; =
My=20
 problem is ... they=92re all different.<o:p></o:p>
 <SPAN=20
 style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial"><o:p>&nbsp;</o:p>
 <SPAN=20
 style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">I have a=20
 173 Elite RG with an IO-540 engine. <SPAN=20
 style=3D"mso-spacerun: yes">&nbsp;I just spoke to Alan Shaw and =
he swears=20
 that a constant speed prop is NOT necessary.<SPAN=20
 style=3D"mso-spacerun: yes">&nbsp; He says the added weight is =
not worth=20
 it and it will actually cut down your cruise speeds a bit.<SPAN=20
 style=3D"mso-spacerun: yes">&nbsp; He said climb performance =
won=92t be a=20
 problem with that engine ... and the =
<st1:PersonName><FONT=20
 face=3DArial size=3D2><SPAN=20
 style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial">Velocity</st1:PersonName><FONT=20
 face=3DArial size=3D2> will be=20
 better off without the extra weight back =
there.<o:p></o:p>
 <SPAN=20
 style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial"><o:p>&nbsp;</o:p>
 <SPAN=20
 style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">He recommended a =
three-blade=20
 performance prop made by Performance Props in=20
 <st1:State><st1:place><SPAN=20
 style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial">Arizona</st1:place></st1:State><FONT=20
 face=3DArial size=3D2>.<SPAN=20
 style=3D"mso-spacerun: yes">&nbsp; He said it should be put on =
a five=20
 inch extension and it will fit perfectly with the cowl he=20
 designed.<o:p></o:p>
 <SPAN=20
 style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial"><o:p>&nbsp;</o:p>
 <SPAN=20
 style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">He said the fixed pitch =
also helps=20
 with cooling because it can get closer to the big cowl openings on =
each side=20
 of the prop and it will actually =93suck out=94 air creating a cooling =

effect.<o:p></o:p>
 <SPAN=20
 style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial"><o:p>&nbsp;</o:p>
 <SPAN=20
 style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">He also said that the =
exhaust=20
 pointing straight out the back through two ports (bottom left and =
right) will=20
 actually cause a venturi effect inside the cowl ... which will force =
cool air=20
 to exit around it =96 again aiding in the cooling of the=20
 engine.<o:p></o:p>
 <SPAN=20
 style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial"><o:p>&nbsp;</o:p>
 <SPAN=20
 style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">He talked for a long =
time and=20
 sounded completely confident and knowledgeable.<SPAN=20
 style=3D"mso-spacerun: yes">&nbsp; =
<o:p></o:p>
 <SPAN=20
 style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial"><o:p>&nbsp;</o:p>
 <SPAN=20
 style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">Since his advice seems =
to be=20
 contrary to a lot of other opinions ... my question to you is=20
 this:<o:p></o:p>
 <SPAN=20
 style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial"><o:p>&nbsp;</o:p>
 <SPAN=20
 style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">DOES IT SOUND=20
 REASONABLE?<o:p></o:p>
 <SPAN=20
 style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial"><o:p>&nbsp;</o:p>
 <SPAN=20
 style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">I am getting to a point =
where I=20
 need to make some decisions.&nbsp; =
Any=20
 feedback will be appreciated.&nbsp; =
The=20
 discussions I have seen here are very intelligent and I want to take =
advantage=20
 of your BRAINS.<o:p></o:p>
 <SPAN=20
 style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial"><o:p>&nbsp;</o:p>
 <SPAN=20
 style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">Thanks in=20
 advance.<o:p></o:p>
 <SPAN=20
 style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial"><o:p>&nbsp;</o:p>
 <st1:PersonName><SPAN =

  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">Tom=20
  Martino</SPAN></FONT></st1:PersonName><FONT face=3DArial =
size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial"><o:p></o:p></SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial"><A=20
  href=3D"http://www.troubleshoter.com/">www.troubleshoter.com</A>=20
  <o:p></o:p></SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3DArial size=3D2><SPAN=20
  style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial"><o:p>&nbsp;</o:p></SPAN></FONT></P>
  <P class=3DMsoNormal><FONT face=3D"Times New Roman" size=3D3><SPAN=20
  style=3D"FONT-SIZE: 12pt; mso-no-proof: =
yes">&nbsp;</SPAN><o:p></o:p></FONT></P>
  <P class=3DMsoNormal><FONT face=3D"Times New Roman" size=3D3><SPAN=20
  style=3D"FONT-SIZE: =
12pt"><o:p>&nbsp;</o:p></SPAN></FONT></P></DIV></BLOCKQUOTE></BODY></HTML=
>

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