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Matt Dralle
Site Admin
Joined: 08 Nov 2005
Posts: 26320
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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dan.pat.b(at)gmail.com
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| Posted: Thu Apr 29, 2010 2:53 am Post subject: Third Taxi Test Video (Brakes Over Heat!)... |
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Matt:Don't push your luck with the taxi tests - you got lucky this time - maybe not so lucky next time. There's a good reason Van does not like high speed taxi tests - people have been bending airplanes - or maybe burning them. Take a deep breath and fly the airplane. OK - enough with the preaching.
Dan Bergeron
RV-7A N307TB
138 hours since first flight on 8/4/09
On Wed, Apr 28, 2010 at 12:29 AM, Matt Dralle <dralle(at)matronics.com (dralle(at)matronics.com)> wrote:
[quote]
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
[b]
| | - The Matronics RV8-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV8-List |
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