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Larry Andrews
Joined: 13 May 2002
Posts: 2848
Location: United States, California, SC Mtns
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 Posted: Tue Jan 15, 2013 8:18 pm Post subject: Great video of IR cameras on kart tires! |
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http://www.youtube.com/watch?v=r6lrbHg9pLk
Pretty hard to keep straight that the video is drivers perspective and the IR feed is backwards from that, so the 'inside' tire is on the outside.
Thoughts? I never realized the inside front worked so hard...have always thought the opposite.
Props to Randy and team at ChaseCam for a fantastic recorder setup...go-to guys for this stuff! |
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Greg Lindahl
Joined: 13 Jan 2011
Posts: 265
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| Posted: Tue Jan 15, 2013 8:32 pm Post subject: |
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Hi Larry.
It's a double reverse image. As we see it, the right and left are the right and left of the kart as it circulates the track.
It is interesting how much both front tires are working. It would be fun to see footage like this with a consitant and fast driver. |
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joseph hollinger
Joined: 12 Sep 2002
Posts: 9475
Location: United States, California, san francisco
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| Posted: Tue Jan 15, 2013 9:56 pm Post subject: |
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Even more fun with a kart with front brakes.
The stupid location where I have my contour mounted means that it shoots great film (can I use word) of my left front tire. I've been amazed at the amount of detail you can see in the images. As you enter the corner, certain parts of the tire grain under the stress and then cleanup on the straights. This stuff is way better, but is is amazing what you can see with an optical image.
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A lie gets halfway around the world before the truth has a chance to get its pants on. -- Winston Churchill. |
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Chris Hurst
Joined: 27 Jul 2007
Posts: 569
Location: United States, California,
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| Posted: Wed Jan 16, 2013 3:47 am Post subject: Re: Great video of IR cameras on kart tires! |
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| Larry Andrews wrote: | http://www.youtube.com/watch?v=r6lrbHg9pLk
Pretty hard to keep straight that the video is drivers perspective and the IR feed is backwards from that, so the 'inside' tire is on the outside.
Thoughts? I never realized the inside front worked so hard...have always thought the opposite.
Props to Randy and team at ChaseCam for a fantastic recorder setup...go-to guys for this stuff! |
Used to autocross with Randy, he was a very sharp guy and this is really cool camera work. Very interesting. What surprised me is how the heat builds up lap after lap. You can really see the progression and at then end it looks like the right rear was starting to show some heat on the inside.
Agreed with the post above, would like to see a driver going 100% for 10 laps - 20 laps and see how the tires heat under those circumstances.
Randy was always fast and very consistent from what I remember. Looking forward to more videos like this.
I'd love to see one with different axle stiffness / track width in different temperature conditions. I was surprised how long it took the rear to register heat signatures on the thermal camera. Was there a scale for temperature range by color / shading on the video that I'm missing?
Would think that with the way a kart's chassis is designed to flex the rear would have started showing some more heat earlier on, but I guess provided it doesn't move nearly as much as the fronts it's logical.
Pretty cool. |
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Chris Livengood
Joined: 24 Jul 2001
Posts: 2432
Location: United States, Pennsylvania, Da Burgh
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Randy Mckee
Joined: 23 Jul 2001
Posts: 746
Location: United States, California,
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| Posted: Wed Jan 16, 2013 4:38 pm Post subject: |
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Outside front. The image is double reversed as Greg said. The outside front does a ton of work on the inside shoulder due to the induced negative camber when the steering is turned.
If you want to verify this in the video, watch the rear tires. The outside is doing the work, and you know the inside does very little since it's un-weighted.
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Randy
#123 TonyKart - S4 Stock Honda |
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Larry Andrews
Joined: 13 May 2002
Posts: 2848
Location: United States, California, SC Mtns
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| Posted: Wed Jan 16, 2013 11:57 pm Post subject: |
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| Greg Lindahl wrote: | Hi Larry.
It's a double reverse image. As we see it, the right and left are the right and left of the kart as it circulates the track.
It is interesting how much both front tires are working. It would be fun to see footage like this with a consitant and fast driver. |
Greg: It took me a while but I think you're right. I knew it was a rotax but somehow got the side of the radiator mixed up. Guess it's a weakness us shifter guys suffer from. 
Chris H: Yeah, Randy is an amazing driver - both cars and karts. A lot of us autocrossers had a ball at Morans many years back. Good times.
I think the rear tires are going to suffer from a distance effect but I really don't know for sure. Seems like the light intensity equation would define the loss as the square of distance and the rear tires are a lot further away than the fronts. Since the FLIR optics/CCD are only sensitive in IR... <shrug> |
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Chris Hurst
Joined: 27 Jul 2007
Posts: 569
Location: United States, California,
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| Posted: Thu Jan 17, 2013 12:07 am Post subject: |
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| Larry Andrews wrote: | | Greg Lindahl wrote: | Hi Larry.
It's a double reverse image. As we see it, the right and left are the right and left of the kart as it circulates the track.
It is interesting how much both front tires are working. It would be fun to see footage like this with a consitant and fast driver. |
Greg: It took me a while but I think you're right. I knew it was a rotax but somehow got the side of the radiator mixed up. Guess it's a weakness us shifter guys suffer from.
Chris H: Yeah, Randy is an amazing driver - both cars and karts. A lot of us autocrossers had a ball at Morans many years back. Good times.
I think the rear tires are going to suffer from a distance effect but I really don't know for sure. Seems like the light intensity equation would define the loss as the square of distance and the rear tires are a lot further away than the fronts. Since the FLIR optics/CCD are only sensitive in IR... <shrug> |
Did you guys run your Auto-X cars at Moran or karts?
I competed in C Stock 2 and did ok. I remember regularly being 2nd or 3rd at most events. If it wasn't for that pesky Stephen Yeoh in his Golf with his index favored car I'm sure I would have done better  They've since changed the index #s for Miatas which is interesting.
At the time I was 18 or so and my real competition was my friend Dan who had a Miata that was similar in modifications but weighed about 80lbs less. A lot of good memories from Auto-x. Driving that guy Alexanders Fiat X1/9 that weighed maybe 1300lbs with a 240hp honda engine on hoosiers was what really made me curious about karts.
Tom Berry was always killing it, but he always had the most insanely over prepped Auto-X cars I can remember. That EVO he had was something else. Always made me wonder how he would do in a kart as I remember asking him one time about road racing and karting and he didn't seem to care for it at all.
I'd love to get back into Auto-x or take the kart to an autocross again, but the costs are just too hard to justify in my mind. I heard Renee passed away a couple years ago too which was kind of hard to deal with. She was always so supportive of me when I got into organized motor racing. It's rare to find people like that in motor sport it seems. Her and Craig both raced those Z06s and she's still to this day one of the best drivers I've ever been in a car with. Rita Wilson too. Ever since Rita gave me a ride in her C5 Z06 I've wanted to own one. Good times. |
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Chris Livengood
Joined: 24 Jul 2001
Posts: 2432
Location: United States, Pennsylvania, Da Burgh
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| Posted: Thu Jan 17, 2013 7:10 am Post subject: |
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| Randy Mckee wrote: | Outside front. The image is double reversed as Greg said. The outside front does a ton of work on the inside shoulder due to the induced negative camber when the steering is turned.
If you want to verify this in the video, watch the rear tires. The outside is doing the work, and you know the inside does very little since it's un-weighted. |
Ahhh yes. Most interesting I suppose is how the outside of the inside-front is being work. Again, because of the camber gain, this time positive. I'd like to see videos back to with caster changes, then camber changes, then KPI changes.
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Rick Crist
Joined: 18 Jun 2002
Posts: 3280
Location: United States, Indiana,
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| Posted: Thu Jan 17, 2013 7:01 pm Post subject: |
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| Does anyone know the specific ºF or ºC color-temperature scale that was used? |
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Larry Andrews
Joined: 13 May 2002
Posts: 2848
Location: United States, California, SC Mtns
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| Posted: Thu Jan 24, 2013 11:46 pm Post subject: |
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Cross-posted...
"Randy Chase: Yellow starts at 60C and goes orange at 65 and pink at 70 … it was a very cold day and a very green track."
140F/149F/158F...pretty cold, betting the tires were barely working at that temp |
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