No subject


Sun Dec 17 12:52:53 CST 2006


c-runup, it sounds to me like the glazed brakes or contamination of the bra=
ke pads.

SB
----- Original Message -----
From: Hiroo Umeno<mailto:humeno at microsoft.com>
To: Velocity Aircraft Owners and Builders list<mailto:reflector at tvbf.org>
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.

It was a rather warm day (80 or so at sea level) and I landed at a 3400ft l=
ong.  Upon touchdown, I braked more firmly than normal since it was a bit s=
horter a strip than normal.  About mid-way down the strip, I noticed that t=
he 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 th=
e 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 th=
e nose cocked left, I could not straighten it out, either.  I had to shut d=
own, push the plane to the ramp, let the brakes cool off, then taxi.

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 w=
ith castering nose gears, I could make a "pin-point turn" by locking one wh=
eel 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 ru=
n-up, I can barely keep it from creeping forward at higher RPMs.

As I have the standard wing and fuselage (SUV), I have the Matco brakes.  M=
y understanding is that the Cleveland upgrade is only necessary on the XL c=
lass aircraft.

How much brake effectiveness should I expect on these Matcos?  I am startin=
g to think I might have an air bubble or two in my lines.

Hiroo
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<div class=3DSection1>

<p class=3DMsoNormal><span style=3D'color:#1F497D'>Scott,<o:p></o:p></span>=
</p>

<p class=3DMsoNormal><span style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span>=
</p>

<p class=3DMsoNormal><span style=3D'color:#1F497D'>Thank you for the insigh=
t.&nbsp; I am
starting to think that my brakes might be &#8220;sub-standard&#8221; in tha=
t perhaps there
is a trapped bubble somewhere.&nbsp; I will bleed it again and see if that =
makes a
difference.&nbsp; I will check for glazing as well while the pants are off.=
<o:p></o:p></span></p>

<p class=3DMsoNormal><span style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span>=
</p>

<p class=3DMsoNormal><span style=3D'color:#1F497D'>My transition training w=
as done
by Steve Murphree, I believe he is a factory authorized and we did go throu=
gh
the airspeeds quite a bit.<o:p></o:p></span></p>

<p class=3DMsoNormal><span style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span>=
</p>

<p class=3DMsoNormal><span style=3D'color:#1F497D'>Hiroo<o:p></o:p></span><=
/p>

<p class=3DMsoNormal><span style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span>=
</p>

<div>

<div style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in'>

<p class=3DMsoNormal><b><span style=3D'font-size:10.0pt;font-family:"Tahoma=
","sans-serif"'>From:</span></b><span
style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] <b>On Behalf=
 Of </b>Scott
Baker<br>
<b>Sent:</b> Monday, June 04, 2007 10:10 AM<br>
<b>To:</b> Velocity Aircraft Owners and Builders list<br>
<b>Subject:</b> Re: REFLECTOR: Brake authority<o:p></o:p></span></p>

</div>

</div>

<p class=3DMsoNormal><o:p>&nbsp;</o:p></p>

<div>

<p class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Arial","s=
ans-serif"'>Hiroo
-</span><span style=3D'font-size:12.0pt;font-family:"Times New Roman","seri=
f"'><o:p></o:p></span></p>

</div>

<div>

<p class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Arial","s=
ans-serif"'>The
Matco W600XT brakes are very effective for SUV, SE, LW/173 model Velocity
aircraft.</span><span style=3D'font-size:12.0pt;font-family:"Times New Roma=
n","serif"'><o:p></o:p></span></p>

</div>

<div>

<p class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Arial","s=
ans-serif"'>I
don't recall if you have been to the factory flight transition training pro=
gram
- to learn the importance of airspeed control on during landing.</span><spa=
n
style=3D'font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p=
></span></p>

</div>

<div>

<p class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Arial","s=
ans-serif"'>We
recommend an approach speed of 1.3 x Vs ...which translates somewhere aroun=
d
85-knots for fully loaded aircraft and around 80-knots when lightly loaded.=
</span><span
style=3D'font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p=
></span></p>

</div>

<div>

<p class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Arial","s=
ans-serif"'>On
a 3000' runway plan on touching down within the first 500' to avoid the nee=
d
for heavy braking.</span><span style=3D'font-size:12.0pt;font-family:"Times=
 New Roman","serif"'><o:p></o:p></span></p>

</div>

<div>

<p class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Arial","s=
ans-serif"'>Fixed
gear aircraft with wheel pants should also consider venting the pants to al=
low
ram-air cooling of the brake discs.</span><span style=3D'font-size:12.0pt;
font-family:"Times New Roman","serif"'><o:p></o:p></span></p>

</div>

<div>

<p class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Arial","s=
ans-serif"'>Also
check the engine idle speed - and confirm you are able to pull the engine p=
ower
to full-idle during landing.&nbsp; If the engine idle is high (by 100 rpm o=
r
more), this will add&nbsp;a lot to the landing distance.&nbsp; Failing to
completely close the throttle during landing also places extra demands on
braking.</span><span style=3D'font-size:12.0pt;font-family:"Times New Roman=
","serif"'><o:p></o:p></span></p>

</div>

<div>

<p class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Arial","s=
ans-serif"'>Make
sure the brake were 'broke-in' correctly and that the discs are not glazed.=
</span><span
style=3D'font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p=
></span></p>

</div>

<div>

<p class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Arial","s=
ans-serif"'>From
your note describing trouble keeping the aircraft stopped during static-run=
up,
it sounds to me like the glazed brakes or contamination of the brake pads.<=
/span><span
style=3D'font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p=
></span></p>

</div>

<div>

<p class=3DMsoNormal><span style=3D'font-size:12.0pt;font-family:"Times New=
 Roman","serif"'>&nbsp;<o:p></o:p></span></p>

</div>

<div>

<p class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Arial","s=
ans-serif"'>SB</span><span
style=3D'font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p=
></span></p>

</div>

<blockquote style=3D'border:none;border-left:solid black 1.5pt;padding:0in =
0in 0in 4.0pt;
margin-left:3.75pt;margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt'>

<div>

<p class=3DMsoNormal><span style=3D'font-size:10.0pt;font-family:"Arial","s=
ans-serif"'>-----
Original Message ----- <o:p></o:p></span></p>

</div>

<div>

<p class=3DMsoNormal style=3D'background:#E4E4E4'><b><span style=3D'font-si=
ze:10.0pt;
font-family:"Arial","sans-serif"'>From:</span></b><span style=3D'font-size:=
10.0pt;
font-family:"Arial","sans-serif"'> <a href=3D"mailto:humeno at microsoft.com"
title=3D"humeno at microsoft.com">Hiroo Umeno</a> <o:p></o:p></span></p>

</div>

<div>

<p class=3DMsoNormal><b><span style=3D'font-size:10.0pt;font-family:"Arial"=
,"sans-serif"'>To:</span></b><span
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif"'> <a
href=3D"mailto:reflector at tvbf.org" title=3D"reflector at tvbf.org">Velocity Ai=
rcraft
Owners and Builders list</a> <o:p></o:p></span></p>

</div>

<div>

<p class=3DMsoNormal><b><span style=3D'font-size:10.0pt;font-family:"Arial"=
,"sans-serif"'>Sent:</span></b><span
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif"'> Monday, June 0=
4,
2007 11:57 AM<o:p></o:p></span></p>

</div>

<div>

<p class=3DMsoNormal><b><span style=3D'font-size:10.0pt;font-family:"Arial"=
,"sans-serif"'>Subject:</span></b><span
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif"'> REFLECTOR: Bra=
ke
authority<o:p></o:p></span></p>

</div>

<div>

<p class=3DMsoNormal><span style=3D'font-size:12.0pt;font-family:"Times New=
 Roman","serif"'><o:p>&nbsp;</o:p></span></p>

</div>

<p class=3DMsoNormal>I had a situation this weekend that heightened the &#8=
220;pucker
factor&#8221; a bit.<o:p></o:p></p>

<p class=3DMsoNormal><o:p>&nbsp;</o:p></p>

<p class=3DMsoNormal>It was a rather warm day (80 or so at sea level) and I
landed at a 3400ft long.&nbsp; Upon touchdown, I braked more firmly than no=
rmal
since it was a bit shorter a strip than normal.&nbsp; About mid-way down th=
e
strip, I noticed that the rate of deceleration has decreased a bit.&nbsp; I
used the full length of the 3400ft to get it stopped and turned off the
active.&nbsp; The parking was at the other end of the field so I taxied
back.&nbsp; It was probably about 5 minutes in taxi and after getting to th=
e
other end of the 3400ft strip, I suddenly realized that I could only turn
left.&nbsp; To make matter worse, once I got the nose cocked left, I could =
not
straighten it out, either.&nbsp; I had to shut down, push the plane to the
ramp, let the brakes cool off, then taxi.<o:p></o:p></p>

<p class=3DMsoNormal><o:p>&nbsp;</o:p></p>

<p class=3DMsoNormal>Now, I&#8217;ve always had an impression that the brak=
ing on my
plane was &#8220;softer&#8221; than other planes I have flown in the past.&=
nbsp; For
example, on the Pipers with castering nose gears, I could make a &#8220;pin=
-point
turn&#8221; by locking one wheel or another by standing on the brake.&nbsp;=
 Not on my
plane.&nbsp; I have the let the plane start rolling and then nudge the nose
over gradually.&nbsp; Also at run-up, I can barely keep it from creeping
forward at higher RPMs.<o:p></o:p></p>

<p class=3DMsoNormal><o:p>&nbsp;</o:p></p>

<p class=3DMsoNormal>As I have the standard wing and fuselage (SUV), I have=
 the
Matco brakes.&nbsp; My understanding is that the Cleveland upgrade is only
necessary on the XL class aircraft.<o:p></o:p></p>

<p class=3DMsoNormal><o:p>&nbsp;</o:p></p>

<p class=3DMsoNormal>How much brake effectiveness should I expect on these
Matcos?&nbsp; I am starting to think I might have an air bubble or two in m=
y
lines.<o:p></o:p></p>

<p class=3DMsoNormal><o:p>&nbsp;</o:p></p>

<p class=3DMsoNormal>Hiroo<o:p></o:p></p>

<div class=3DMsoNormal align=3Dcenter style=3D'text-align:center'><span
style=3D'font-size:12.0pt;font-family:"Times New Roman","serif"'>

<hr size=3D2 width=3D"100%" align=3Dcenter>

</span></div>

<p class=3DMsoNormal><span style=3D'font-size:12.0pt;font-family:"Times New=
 Roman","serif"'>_______________________________________________<br>
To change your email address, visit
http://www.tvbf.org/mailman/listinfo/reflector<br>
<br>
Visit the gallery!&nbsp; www.tvbf.org/gallery<br>
user:pw =3D tvbf:jamaicangoose<br>
Check new archives: www.tvbf.org/pipermail<br>
Check old archives: http://www.tvbf.org/archives/velocity/maillist.html<o:p=
></o:p></span></p>

</blockquote>

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