No subject
Sun Dec 17 12:52:53 CST 2006
static-runup, it sounds to me like the glazed brakes or contamination of =
the brake pads.
SB
----- Original Message -----=20
From: Hiroo Umeno=20
To: Velocity Aircraft Owners and Builders list=20
Sent: Monday, June 04, 2007 11:57 AM
Subject: REFLECTOR: Brake authority
I had a situation this weekend that heightened the "pucker factor" a =
bit.
=20
It was a rather warm day (80 or so at sea level) and I landed at a =
3400ft long. Upon touchdown, I braked more firmly than normal since it =
was a bit shorter a strip than normal. About mid-way down the strip, I =
noticed that the rate of deceleration has decreased a bit. I used the =
full length of the 3400ft to get it stopped and turned off the active. =
The parking was at the other end of the field so I taxied back. It was =
probably about 5 minutes in taxi and after getting to the other end of =
the 3400ft strip, I suddenly realized that I could only turn left. To =
make matter worse, once I got the nose cocked left, I could not =
straighten it out, either. I had to shut down, push the plane to the =
ramp, let the brakes cool off, then taxi.
=20
Now, I've always had an impression that the braking on my plane was =
"softer" than other planes I have flown in the past. For example, on =
the Pipers with castering nose gears, I could make a "pin-point turn" by =
locking one wheel or another by standing on the brake. Not on my plane. =
I have the let the plane start rolling and then nudge the nose over =
gradually. Also at run-up, I can barely keep it from creeping forward =
at higher RPMs.
=20
As I have the standard wing and fuselage (SUV), I have the Matco =
brakes. My understanding is that the Cleveland upgrade is only =
necessary on the XL class aircraft.
=20
How much brake effectiveness should I expect on these Matcos? I am =
starting to think I might have an air bubble or two in my lines.
=20
Hiroo
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<DIV><FONT face=3DArial size=3D2>Hiroo -</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>The Matco W600XT brakes are very =
effective for SUV,=20
SE, LW/173 model Velocity aircraft.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>I don't recall if you have been to the =
factory=20
flight transition training program - to learn the importance of airspeed =
control=20
on during landing.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>We recommend an approach speed of 1.3 x =
Vs ...which=20
translates somewhere around 85-knots for fully loaded aircraft and =
around=20
80-knots when lightly loaded.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>On a 3000' runway plan on touching down =
within the=20
first 500' to avoid the need for heavy braking.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>Fixed gear aircraft with wheel pants =
should also=20
consider venting the pants to allow ram-air cooling of the brake=20
discs.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>Also check the engine idle speed - and =
confirm you=20
are able to pull the engine power to full-idle during landing. If =
the=20
engine idle is high (by 100 rpm or more), this will add a lot to =
the=20
landing distance. Failing to completely close the throttle during =
landing=20
also places extra demands on braking.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>Make sure the brake were 'broke-in' =
correctly and=20
that the discs are not glazed.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>From your note describing trouble =
keeping the=20
aircraft stopped during static-runup, it sounds to me like the glazed =
brakes or=20
contamination of the brake pads.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial size=3D2>SB</FONT></DIV>
<BLOCKQUOTE=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"><B>From:</B>=20
<A title=3Dhumeno at microsoft.com =
href=3D"mailto:humeno at microsoft.com">Hiroo=20
Umeno</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Dreflector at tvbf.org=20
href=3D"mailto:reflector at tvbf.org">Velocity Aircraft Owners and =
Builders=20
list</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Monday, June 04, 2007 =
11:57=20
AM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> REFLECTOR: Brake =
authority</DIV>
<DIV><BR></DIV>
<DIV class=3DSection1>
<P class=3DMsoNormal>I had a situation this weekend that heightened =
the =93pucker=20
factor=94 a bit.<o:p></o:p></P>
<P class=3DMsoNormal><o:p> </o:p></P>
<P class=3DMsoNormal>It was a rather warm day (80 or so at sea level) =
and I=20
landed at a 3400ft long. Upon touchdown, I braked more firmly =
than=20
normal since it was a bit shorter a strip than normal. About =
mid-way=20
down the strip, I noticed that the rate of deceleration has decreased =
a=20
bit. I used the full length of the 3400ft to get it stopped and =
turned=20
off the active. The parking was at the other end of the field so =
I=20
taxied back. It was probably about 5 minutes in taxi and after =
getting=20
to the other end of the 3400ft strip, I suddenly realized that I could =
only=20
turn left. To make matter worse, once I got the nose cocked =
left, I=20
could not straighten it out, either. I had to shut down, push =
the plane=20
to the ramp, let the brakes cool off, then taxi.<o:p></o:p></P>
<P class=3DMsoNormal><o:p> </o:p></P>
<P class=3DMsoNormal>Now, I=92ve always had an impression that the =
braking on my=20
plane was =93softer=94 than other planes I have flown in the =
past. For=20
example, on the Pipers with castering nose gears, I could make a =
=93pin-point=20
turn=94 by locking one wheel or another by standing on the =
brake. Not on=20
my plane. I have the let the plane start rolling and then nudge =
the nose=20
over gradually. Also at run-up, I can barely keep it from =
creeping=20
forward at higher RPMs.<o:p></o:p></P>
<P class=3DMsoNormal><o:p> </o:p></P>
<P class=3DMsoNormal>As I have the standard wing and fuselage (SUV), I =
have the=20
Matco brakes. My understanding is that the Cleveland upgrade is =
only=20
necessary on the XL class aircraft.<o:p></o:p></P>
<P class=3DMsoNormal><o:p> </o:p></P>
<P class=3DMsoNormal>How much brake effectiveness should I expect on =
these=20
Matcos? I am starting to think I might have an air bubble or two =
in my=20
lines.<o:p></o:p></P>
<P class=3DMsoNormal><o:p> </o:p></P>
<P class=3DMsoNormal>Hiroo<o:p></o:p></P></DIV>
<P>
<HR>
<P></P>_______________________________________________<BR>To change =
your email=20
address, visit =
http://www.tvbf.org/mailman/listinfo/reflector<BR><BR>Visit the=20
gallery! www.tvbf.org/gallery<BR>user:pw =3D =
tvbf:jamaicangoose<BR>Check=20
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=
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