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1. 07:51 AM - Re: Third Taxi Test Video (Brakes Over Heat!)... (Gordon Jack)
2. 08:22 AM - Re: Third Taxi Test Video (Brakes Over Heat!)... (Franz Fux)
Message 1
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| Subject: | Third Taxi Test Video (Brakes Over Heat!)... |
Matt
Just a follow up
I was thinking later last night and this morning that the hot brake problem
may not be because of the taxi tests.
I may have dodged a problem with the brakes on my plane early on during the
first few startups.
I had dragging brake pedal problem noticed when pushing the plane back into
the hanger. I could feel and hear the brakes dragging. The hinge point on
the brake pedal was a bit snug particularly on the left side. The pedal was
not completely disengaging and if I hadn't found it then I may have had a
problem like yours even without taxi tests. After a couple of minutes
without applying the brake the situation corrected itself which would not
happen during a taxi, takeoff or landing situation. .
I backed off the bolts a bit, installed new cotter pins and made sure the
hinge point was lubed. End of problem.
I had inquired about taxi tests after a local guy had his wheel pant nearly
catch fire while taxi testing and was told just do enough to be confident
with directional control.
Where I live the average taxi is about a mile and usually in a crosswind and
the brakes are holding up excellent.
Hope you solve the problem.
Gord
.
-----Original Message-----
From: owner-rv7-list-server@matronics.com
[mailto:owner-rv7-list-server@matronics.com] On Behalf Of Matt Dralle
Sent: April 27, 2010 9:29 PM
Subject: RV7-List: Third Taxi Test Video (Brakes Over Heat!)...
On the third taxi test, I headed out to the main runway at Livermore, 25R
and ask the tower for a high-speed taxi test with no take off. It was
approved as requested and went great. There was about a 15-20 knot head
wind at about 270 which made it even more fun. The RV-8 handled great and
it was definitely ready to take off. I only got to about 1/3 power and it
would have taken off with about 1/2 throttle probably. Oh my... What will
FULL throttle be like!? Now that's exciting! Be sure to watch the Part 2 of
this video because as the music gets more intense, so does the testing!
Third Taxi Test - Part 1
http://www.youtube.com/MattsRV8?v=pnz31m6aVEQ
After the taxi back on the regular taxi way, the tower offered to let me run
back the other direction on the runway! I wasn't sure that's really what he
was suggesting and I had to verify that's what he really meant. It was
pretty cool and saved a lot of time. With the 15-20 knot tailwind, though, I
probably would have been better off just using the taxi way. Now you'll
notice the music is getting a bit more intense. Be sure to watch Part 3
because that's where this taxi test REALLY get's interesting...
Third Taxi Test - Part 2
http://www.youtube.com/MattsRV8?v=5zheOkSHfX4
As you'll see in that part of the third taxi test, I lost the brakes. As
I'm taxing off the runway I noticed that there was smoke coming out of both
the left and right sides. At the time, I really wasn't sure what caused the
brakes to get so hot. But, after watching the video a couple of time and
recalling back to what I was doing, I'm positive that I was dragging the
brakes on those down-wind trips. I even remember thinking at one point,
"oh, I'm riding the brakes". Doesn't seem like they should get so hot as to
start smoking, but perhaps it was a combination of being new, over worked,
and a bit of brake fluid leaking out and hitting the discs. Anyway, my
comment at the end of the video is kind of funny. It wasn't at the time,
mind you... :-)
Third Taxi Test - Part 3
http://www.youtube.com/MattsRV8?v=57W-O8905cg
After I hosed the wheel pants and brakes down and got things cooled off and
no longer smoking, I had to push the plane back to the hangar from the wash
rack, which isn't too far, but still kind of a long ways at the end of a
day. As I was pushing it back I noticed that there was brake fluid leaking
out of the right brake. I pushed the plane about 1/2 the way into the
hangar and took the wheel pants off. Once I got the leaks stopped, I pushed
the plane the rest of the way in. It was kind of a demoralizing sight to
see the brake calipers smoked like that, but it could have been a lot worse.
A word to the wise - STAY OFF THE BRAKES!!! Its really easy to drag them
and this video is a document to what can happen.
Third Taxi Test - Epilogue
http://www.youtube.com/MattsRV8?v=JlQjRWnbO2c
The brakes were pretty toasted as were the sidewalls of the tires. There
were little bits of rubber coming off the sidewall around the wheel. The
brake pads definitely looked worn down some compared to the set I have on
the partially completed RV-4. So in the interest of not holding up the test
flight progress, I opted to use the wheels, brakes, and tires from the RV-4
project to replace the smoked components on the RV-8. I'll order a new set
for the RV-4 later.
I spent the day jacking up the plane and swapping pieces. I also took the
opportunity to remove the right master cylinder and fix the pesky
high-pressure side leak. Here's a video of the wheels, brakes, and tires
all replaced and ready for testing.
Third Taxi Test - Post Epilogue
http://www.youtube.com/MattsRV8?v=dL92Hwi0xnE
Matt Dralle
RV-8 #82880 N998RV
http://www.mattsrv8.com - Matt's RV-8 Construction Log
http://www.youtube.com/MattsRV8 - Matt's RV-8 HDTV YouTube Channel
Status: Test Flying
Message 2
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| Subject: | Re: Third Taxi Test Video (Brakes Over Heat!)... |
A word to the wise,
Taxi tests do not really serve any purpose and are potentially dangerous as
they often lead to unexpected take off and flying experiences with pilots on
the controls that are not really ready for such experience. It can also lead
to smoking brakes and potential fires while taxiing. I don't want to spoil
your fun Matt but you could have last your plane to a fire before it even
flew, so be careful, minimize your taxi tests and go flying
Franz
RV7A, flying for four years, no taxi tests
On 27/04/10 10:50 PM, "Gordon Jack" <gordjack@telus.net> wrote:
>
> Matt
>
> I did not have this problem
> I did not do a taxi test as per Van's instructions.
>
> Gord
> Rv 7A C-FRVN 70011 180 CS Hart BA 7496
> First flight June 17 2008
> TTSN 238HRS
> I had barely 100hrs PIC during the early flights.
> Since
>
> 44 First time RV Rides
> 26 Airports
> 19 fly-ins and airshows
>
> I am really looking forward to your reports with your ability to put into
> words the experiences when you have the same time and enjoyment as C-FRVN
> has given me.
>
> We can not truly put into words what this experience has given Karen and
> myself.
>
> All the Best
>
> Gord
>
>
>
> -----Original Message-----
> From: owner-rv7-list-server@matronics.com
> [mailto:owner-rv7-list-server@matronics.com] On Behalf Of Matt Dralle
> Sent: April 27, 2010 9:29 PM
> To: rv-list@matronics.com; rv8-list@matronics.com; rv7-list@matronics.com
> Subject: RV7-List: Third Taxi Test Video (Brakes Over Heat!)...
>
>
> On the third taxi test, I headed out to the main runway at Livermore, 25R
> and ask the tower for a high-speed taxi test with no take off. It was
> approved as requested and went great. There was about a 15-20 knot head
> wind at about 270 which made it even more fun. The RV-8 handled great and
> it was definitely ready to take off. I only got to about 1/3 power and it
> would have taken off with about 1/2 throttle probably. Oh my... What will
> FULL throttle be like!? Now that's exciting! Be sure to watch the Part 2 of
> this video because as the music gets more intense, so does the testing!
>
> Third Taxi Test - Part 1
>
> http://www.youtube.com/MattsRV8?v=pnz31m6aVEQ
>
>
> After the taxi back on the regular taxi way, the tower offered to let me run
> back the other direction on the runway! I wasn't sure that's really what he
> was suggesting and I had to verify that's what he really meant. It was
> pretty cool and saved a lot of time. With the 15-20 knot tailwind, though, I
> probably would have been better off just using the taxi way. Now you'll
> notice the music is getting a bit more intense. Be sure to watch Part 3
> because that's where this taxi test REALLY get's interesting...
>
> Third Taxi Test - Part 2
>
> http://www.youtube.com/MattsRV8?v=5zheOkSHfX4
>
>
> As you'll see in that part of the third taxi test, I lost the brakes. As
> I'm taxing off the runway I noticed that there was smoke coming out of both
> the left and right sides. At the time, I really wasn't sure what caused the
> brakes to get so hot. But, after watching the video a couple of time and
> recalling back to what I was doing, I'm positive that I was dragging the
> brakes on those down-wind trips. I even remember thinking at one point,
> "oh, I'm riding the brakes". Doesn't seem like they should get so hot as to
> start smoking, but perhaps it was a combination of being new, over worked,
> and a bit of brake fluid leaking out and hitting the discs. Anyway, my
> comment at the end of the video is kind of funny. It wasn't at the time,
> mind you... :-)
>
> Third Taxi Test - Part 3
>
> http://www.youtube.com/MattsRV8?v=57W-O8905cg
>
>
> After I hosed the wheel pants and brakes down and got things cooled off and
> no longer smoking, I had to push the plane back to the hangar from the wash
> rack, which isn't too far, but still kind of a long ways at the end of a
> day. As I was pushing it back I noticed that there was brake fluid leaking
> out of the right brake. I pushed the plane about 1/2 the way into the
> hangar and took the wheel pants off. Once I got the leaks stopped, I pushed
> the plane the rest of the way in. It was kind of a demoralizing sight to
> see the brake calipers smoked like that, but it could have been a lot worse.
>
> A word to the wise - STAY OFF THE BRAKES!!! Its really easy to drag them
> and this video is a document to what can happen.
>
> Third Taxi Test - Epilogue
>
> http://www.youtube.com/MattsRV8?v=JlQjRWnbO2c
>
>
> The brakes were pretty toasted as were the sidewalls of the tires. There
> were little bits of rubber coming off the sidewall around the wheel. The
> brake pads definitely looked worn down some compared to the set I have on
> the partially completed RV-4. So in the interest of not holding up the test
> flight progress, I opted to use the wheels, brakes, and tires from the RV-4
> project to replace the smoked components on the RV-8. I'll order a new set
> for the RV-4 later.
>
> I spent the day jacking up the plane and swapping pieces. I also took the
> opportunity to remove the right master cylinder and fix the pesky
> high-pressure side leak. Here's a video of the wheels, brakes, and tires
> all replaced and ready for testing.
>
> Third Taxi Test - Post Epilogue
>
> http://www.youtube.com/MattsRV8?v=dL92Hwi0xnE
>
>
>
> Matt Dralle
> RV-8 #82880 N998RV
> http://www.mattsrv8.com - Matt's RV-8 Construction Log
> http://www.youtube.com/MattsRV8 - Matt's RV-8 HDTV YouTube Channel
> Status: Test Flying
>
>
>
>
>
>
Franz Fux
Director of Operations
Last Frontier Heliskiing Ltd.
Bell 2 Lodge
P.O. Box 1237
Vernon, BC, V1T 6N6
CANADA
Office Contact
T: (250) 558-7980
F: (250) 558-7981
Lodge Contact
T: (250) 275-4770
F: (250) 275-4912
http://www.bell2lodge.com
---
LAST FRONTIER Heliskiing
www.lastfrontierheli.com
---
And for some of the best Steelhead Fishing in the world at Bell 2 Lodge
www.steelhead-fishing.net
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