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Matt Dralle
Site Admin
Joined: 08 Nov 2005
Posts: 26321
Location: Livermore CA USA
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 Posted: Tue Apr 27, 2010 8:30 pm Post subject: Third Taxi Test Video (Brakes Over Heat!)... |
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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
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dsvs(at)ca.rr.com
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| Posted: Tue Apr 27, 2010 9:04 pm Post subject: Third Taxi Test Video (Brakes Over Heat!)... |
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Hey Matt,
Sorry to hear about your brake issues. I just switched to Grove brakes with
a thicker rotor and also switched to DOT4 brake fluid.
My Cleveland brakes overheated every time I would do three full stops.
Never got smoke but the wheel pants were hot enough to burn your hand if you
touched them. I have a 7 which like your 8 is a little heavy.
--
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gordjack(at)telus.net
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| Posted: Tue Apr 27, 2010 9:52 pm Post subject: Third Taxi Test Video (Brakes Over Heat!)... |
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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
--
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gordjack(at)telus.net
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| Posted: Wed Apr 28, 2010 6:51 am Post subject: Third Taxi Test Video (Brakes Over Heat!)... |
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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
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franz(at)lastfrontierheli
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| Posted: Wed Apr 28, 2010 7:22 am Post subject: Third Taxi Test Video (Brakes Over Heat!)... |
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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(at)telus.net> wrote:
[quote]
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
--
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