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#41
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Waxing workbench--camera commets
pigo wrote:
On Oct 7, 8:05 am, downhill wrote: MoonMan wrote: downhill wrote: Dave Cartman wrote: In article , downhill wrote: I try to pay attention to techie type threads. Been testing this new camera with 3 axis accelerometers and GPS for speed. It weighs 23 grams and slightly longer that a pack of 100's. But it shows speed and forces generated as a overlay on video. Been testing it on cars and the video and data is great, can not wait to test it when ski racing. The one problem with camera lens and high humidity days. I am very curious as to the G forces generated in a turn when skiing, very interested in determining how accurate it is. As we do not mount accelerometers loosely it is in a fixed position mounted 90 degrees to the linear one. Speed should be some what accurate. http://www.smartycam.com/ The camera looks brilliant, exactly what I want, then I eventually found a price perhaps I'll wait a bit. Yes It is a steep one. They just released it I think there is less than a hundred in the states, they are selling them in europe but there doing a bunch of upgrades on firmware. But a chase cam with modules to do same thing is about 800 american so this is not that much more expensive. I am waiting for the CAN bus interface that will let me overlay data from my bmw it plugs into diagnostic connector and pulls out data like rpm and throttle position- Hide quoted text - - Show quoted text - Hey! Isn't this where "jeff davis" jumps in and makes some kind of rediculous assertion? Wouldn't know, I got bored with him too -- Chris *:-) Rule 1 - Me first Rule 2 - Downhill Good, Uphill BAD! Rule 3 - Skis at the bottom, Head at the top! www.suffolkvikings.org.uk |
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#42
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Waxing workbench--camera commets
On Oct 7, 8:15*am, "MoonMan"
wrote: pigo wrote: On Oct 7, 8:05 am, downhill wrote: MoonMan wrote: downhill wrote: Dave Cartman wrote: In article , downhill wrote: I try to pay attention to techie type threads. Been testing this new camera with 3 axis accelerometers and GPS for speed. It weighs 23 grams and slightly longer that a pack of 100's. But it shows speed and forces generated as a overlay on video. Been testing it on cars and the video and data is great, can not wait to test it when ski racing. The one problem with camera lens and high humidity days. I am very curious as to the G forces generated in a turn when skiing, very interested in determining how accurate it is. As we do not mount accelerometers loosely it is in a fixed position mounted 90 degrees to the linear one. Speed should be some what accurate. http://www.smartycam.com/ The camera looks brilliant, exactly what I want, then I eventually found a price perhaps I'll wait a bit. Yes It is a steep one. They just released it I think there is less than a hundred in the states, they are selling them in europe but there doing a bunch of upgrades on firmware. But a chase cam with modules to do same thing is about 800 american so this is not that much more expensive. I am waiting for the CAN bus interface that will let me overlay data from my bmw it plugs into diagnostic connector and pulls out data like rpm and throttle position- Hide quoted text - - Show quoted text - Hey! Isn't this where "jeff davis" jumps in and makes some kind of rediculous assertion? Wouldn't know, I got bored with him too But you didn't get tired of Dickless Bob Thompson, eh? The deranged, brain damaged drunk who repeatedly accuses me of molesting children, or makes sick jokes about rape, or.....hell, is simply one of the biggest assholes ever to post to RSA. Knew you were a pathetic, laughable freak, but I thought better of you. Thanks for ****ing yourself, idiot. |
#43
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Waxing workbench--camera commets
On Oct 7, 8:04*am, pigo wrote:
On Oct 7, 8:05*am, downhill wrote: MoonMan wrote: downhill wrote: Dave Cartman wrote: In article , *downhill wrote: I try to pay attention to techie type threads. Been testing this new camera with 3 axis accelerometers and GPS for speed. It weighs 23 grams and slightly longer that a pack of 100's.. But it shows speed and forces generated as a overlay on video. Been testing it on cars and the video and data is great, can not wait to test it when ski racing. The one problem with camera lens and high humidity days. I am very curious as to the G forces generated in a turn when skiing, very interested in determining how accurate it is. As we do not mount accelerometers loosely it is in a fixed position mounted 90 degrees to the linear one. Speed should be some what accurate. http://www.smartycam.com/ The camera looks brilliant, exactly what I want, then I eventually found a price perhaps I'll wait a bit. Yes It is a steep one. They just released it I think there is less than a hundred in the states, they are selling them in europe but there doing a bunch of upgrades on firmware. But a chase cam with modules to do same thing is about 800 american so this is not that much more expensive. I am waiting for the CAN bus interface that will let me overlay data from my bmw it plugs into diagnostic connector and pulls out data like rpm and throttle position- Hide quoted text - - Show quoted text - Hey! Isn't this where "jeff davis" jumps in and makes some kind of rediculous assertion Yeah, like inviting you to show up at the SLC airport, and you peeing your pants and running? Ah, well. At least Jeff can spell ridiculous, you ridiculous dumb****. |
#44
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Waxing workbench--camera commets
In article ,
downhill wrote: I'm kidding, that looks super cool. In order to get "accurate" G force information do you think it matters where and how you affix to your body? Yes it matters, in the karts we get a higher g-force reading when the accelerometer is placed under the faring verses the on the floor. The recommended place is in the center of gravity and lowest in the car as possible. One car I run the logging unit with the axis swapped because in that formula car it interferes with him sitting. In the software setup I swap the x and y axis. Since you build track maps based on speed and lateral g-force it looks pretty funny when it shows a curve on a straight section of the track or braking after a turn. Spend much of my times chasing variable names as the two major data acquisition suppliers Pi & motec are from UK and DownUnder are very creative in the choice of variable names. In the context of G force accuracy the amount of knowledge gleamed from the process depends on your method of analysis, if you just look for big numbers you might be disappointed seems often that trends become more useful. Or it could turn out all crap because it is a 3 axis accelerometer and in most automobile cases the z axis is not present to any degree, but in ski racing the z axis is very present and a component of your speed I don't pretend to know anything about this, but I wonder how much the skilled skier would "dampen" (and I use the word "dampen" casually) the forces in the upper body vs at the ski. |
#45
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Waxing workbench--camera commets
Dave Cartman wrote:
In article , downhill wrote: I'm kidding, that looks super cool. In order to get "accurate" G force information do you think it matters where and how you affix to your body? Yes it matters, in the karts we get a higher g-force reading when the accelerometer is placed under the faring verses the on the floor. The recommended place is in the center of gravity and lowest in the car as possible. One car I run the logging unit with the axis swapped because in that formula car it interferes with him sitting. In the software setup I swap the x and y axis. Since you build track maps based on speed and lateral g-force it looks pretty funny when it shows a curve on a straight section of the track or braking after a turn. Spend much of my times chasing variable names as the two major data acquisition suppliers Pi & motec are from UK and DownUnder are very creative in the choice of variable names. In the context of G force accuracy the amount of knowledge gleamed from the process depends on your method of analysis, if you just look for big numbers you might be disappointed seems often that trends become more useful. Or it could turn out all crap because it is a 3 axis accelerometer and in most automobile cases the z axis is not present to any degree, but in ski racing the z axis is very present and a component of your speed I don't pretend to know anything about this, but I wonder how much the skilled skier would "dampen" (and I use the word "dampen" casually) the forces in the upper body vs at the ski. Substantially. But the G forces at the ski are somewhat meaningless. What really matters is the G force of the center of mass of the skier and all his gear. The extreme G's as the skies bounce over rough texture don't significantly affect the directional changes of the skier as they average out over time. |
#46
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Waxing workbench--camera commets
In article ,
The Real Bev wrote: I don't pretend to know anything about this, but I wonder how much the skilled skier would "dampen" (and I use the word "dampen" casually) the forces in the upper body vs at the ski. It's DAMP in this context, unless the skier is actually wetting his pants, and that's what knees are for. Look, there's only one way to settle this war of terminology and that is to bring in an expert in MA* (*Motion Analysis) and have him clear this up straight away. Don't think I won't do it! |
#47
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Waxing workbench--camera commets
On Oct 7, 8:19*pm, Dave Cartman wrote:
In article , *The Real Bev wrote: I don't pretend to know anything about this, but I wonder how much the skilled skier would "dampen" (and I use the word "dampen" casually) the forces in the upper body vs at the ski. It's DAMP in this context, unless the skier is actually wetting his pants, and that's what knees are for. Look, there's only one way to settle this war of terminology and that is to bring in an expert in MA* (*Motion Analysis) and have him clear this up straight away. *Don't think I won't do it! Mr. Physics? |
#48
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Waxing workbench--camera commets
In article
, Richard Henry wrote: On Oct 7, 8:19*pm, Dave Cartman wrote: In article , *The Real Bev wrote: I don't pretend to know anything about this, but I wonder how much the skilled skier would "dampen" (and I use the word "dampen" casually) the forces in the upper body vs at the ski. It's DAMP in this context, unless the skier is actually wetting his pants, and that's what knees are for. Look, there's only one way to settle this war of terminology and that is to bring in an expert in MA* (*Motion Analysis) and have him clear this up straight away. *Don't think I won't do it! Mr. Physics? Oh yeah. I'll do it too. All I need to do is utter a couple of key phrases and "POOF!" |
#49
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Waxing workbench--camera commets
The Real Bev wrote:
MoonMan wrote: downhill wrote: Dave Cartman wrote: In article , downhill wrote: I try to pay attention to techie type threads. Been testing this new camera with 3 axis accelerometers and GPS for speed. It weighs 23 grams and slightly longer that a pack of 100's. But it shows speed and forces generated as a overlay on video. Been testing it on cars and the video and data is great, can not wait to test it when ski racing. The one problem with camera lens and high humidity days. I am very curious as to the G forces generated in a turn when skiing, very interested in determining how accurate it is. As we do not mount accelerometers loosely it is in a fixed position mounted 90 degrees to the linear one. Speed should be some what accurate. http://www.smartycam.com/ The camera looks brilliant, exactly what I want, then I eventually found a price perhaps I'll wait a bit. What was it? I got tired of looking. I'm in the UK, so I got GBP 695 or EUR 749 so at current rates that's just over $1000 ouch -- Chris *:-) Rule 1 - Me first Rule 2 - Downhill Good, Uphill BAD! Rule 3 - Skis at the bottom, Head at the top! www.suffolkvikings.org.uk |
#50
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Waxing workbench--camera commets
MoonMan wrote:
The Real Bev wrote: MoonMan wrote: found a price perhaps I'll wait a bit. What was it? I got tired of looking. I'm in the UK, so I got GBP 695 or EUR 749 so at current rates that's just over $1000 ouch list is 995 over here |
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