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From: Gary Casey <casey.gary@yahoo.com>
Subject: Re: L-360 Engine Angle
In-Reply-To: <listdigest-4940277@logan.com>
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I'm not sure I understand:=A0 The angle to right built into most planes is =
to =0Areduce the amount of right rudder required on takeoff.=A0 So=A0 why w=
ould you want =0Ato REDUCE the angle to the right?=A0 Most (or at least man=
y) planes have the =0Aengine tilted down and to the right - the down angle =
is to reduce the elevator =0Atrim requirement (nose-up pitch on power appli=
cation) and the angle to the right =0Ais for rudder trim.=A0 One problem, a=
nd one that I found with my ES mount, is that =0ALancair turned the engine =
to the right, but the rear of the engine was =0Aapproximately on the center=
line.=A0 That put the front of the engine to the right =0Aof the centerline=
, adding a left-turning tendency, the opposite of what is =0Adesired.=A0 Re=
gardless, I would suggest that you want more angle on the engine, =0Anot le=
ss, and I don't think you want to angle the engine up any more than it =0Ai=
s.=A0 Having the engine nose-down is probably=A0desired, but that's =0Aanot=
her=A0discussion.=A0 Sometimes the=A0left-turning tendency is caused by an =
=0Aincorrect angle of incidence of the vertical fin, but of course that is =
a =0Ahard=A0thing to modify.=A0 I think with an engine that big on your 360=
 you are stuck =0Awith that magnitude of rudder requirement on takeoff.=A0=
=0AGary Casey=0AES #157, Lyc IO-540=0A=A0=0AFrom: =0A"Tom McNerney" <dudewa=
narace@yahoo.com>=0AI have a 360 with an angle valve motor. XP-400SRE=A0 25=
0 hours on this engine =0Anow.=A0 I would like to eliminate the amount of r=
udder=A0required to keep the plane =0Asquare. (ball in the cage)=A0 I have =
good reason to suspect the engine has been =0Ainstalled with too much yaw.=
=0A=0AI have the engine level to the airframe in pitch.=A0 The manual calls=
 for 1.5 =0Adegrees to the right in regards to yaw. (if I remember correctl=
y)=A0 I assume this =0Awas built in to the engine mount.=0A=0AIn order for =
me to get the engine level at 0, and straight in yaw, it would take =0Aabou=
t a half inch of washers on lower right rubber engine mount, and one quarte=
r =0Ainch of washers on the upper right mount.=0A=0AIs this normal?=0A=0ATo=
m
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<html><head><style type=3D"text/css"><!-- DIV {margin:0px;} --></style></he=
ad><body><div style=3D"font-family:bookman old style, new york, times, seri=
f;font-size:12pt"><P>I'm not sure I understand:&nbsp; The angle to right bu=
ilt into most planes is to reduce the amount of right rudder required on ta=
keoff.&nbsp; So&nbsp; why would you want to REDUCE the angle to the right?&=
nbsp; Most (or at least many) planes have the engine tilted down and to the=
 right - the down angle is to reduce the elevator trim requirement (nose-up=
 pitch on power application) and the angle to the right is for rudder trim.=
&nbsp; One problem, and one that I found with my ES mount, is that Lancair =
turned the engine to the right, but the rear of the engine was approximatel=
y on the centerline.&nbsp; That put the front of the engine to the right of=
 the centerline, adding a left-turning tendency, the opposite of what is de=
sired.&nbsp; Regardless, I would suggest that you want more angle on the
 engine, not less, and I don't think you want to angle the engine up any mo=
re than it is.&nbsp; Having the engine nose-down is probably&nbsp;desired, =
but that's another&nbsp;discussion.&nbsp; Sometimes the&nbsp;left-turning t=
endency is caused by an incorrect angle of incidence of the vertical fin, b=
ut of course that is a hard&nbsp;thing to modify.&nbsp; I think with an eng=
ine that big on your 360 you are stuck with that magnitude of rudder requir=
ement on takeoff.&nbsp;</P>=0A<P>Gary Casey</P>=0A<P>ES #157, Lyc IO-540</P=
>=0A<P>&nbsp;</P>=0A<DIV class=3Dmsgheader>=0A<DIV class=3D"subjectbar font=
T2">=0A<DIV class=3D"clearFloat padding2px">=0A<DIV class=3Dpadding2px>=0A<=
DIV class=3Dlabel>From: </DIV>=0A<DIV class=3Ddetails>=0A<DIV class=3Dabook=
><SPAN>"Tom McNerney" &lt;<A href=3D"mailto:dudewanarace@yahoo.com">dudewan=
arace@yahoo.com</A>&gt;</SPAN></DIV>=0A<DIV class=3DclearFloat></DIV></DIV>=
=0A<DIV class=3DclearFloat></DIV></DIV>=0A<DIV class=3Dpadding2px>=0A<DIV c=
lass=3DclearFloat></DIV></DIV></DIV></DIV></DIV>=0A<DIV class=3Dpadding5px>=
=0A<DIV class=3DplainMail>=0A<STYLE type=3Dtext/css><!--DIV {margin:0px;}--=
></STYLE>=0A=0A<DIV style=3D"FONT-FAMILY: times new roman, new york, times,=
 serif; FONT-SIZE: 12pt">=0A<DIV>I have a 360 with an angle valve motor. XP=
-400SRE&nbsp; 250 hours on this engine now.&nbsp; I would like to eliminate=
 the amount of rudder&nbsp;required to keep the plane square. (ball in the =
cage)&nbsp; I have good reason to suspect the engine has been installed wit=
h too much yaw.</DIV>=0A<DIV>&nbsp;</DIV>=0A<DIV>I have the engine level to=
 the airframe in pitch.&nbsp; The manual calls for 1.5 degrees to the right=
 in regards to yaw. (if I remember correctly)&nbsp; I assume this was built=
 in to the engine mount.</DIV>=0A<DIV>&nbsp;</DIV>=0A<DIV>In order for me t=
o get the engine level at 0, and straight in yaw, it would take about a hal=
f inch of washers on lower right rubber engine mount, and one quarter inch =
of washers on the upper right mount.</DIV>=0A<DIV>&nbsp;</DIV>=0A<DIV>Is th=
is normal?</DIV>=0A<DIV>&nbsp;</DIV>=0A<DIV>Tom</DIV></DIV></DIV></DIV></di=
v></body></html>
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