Aero Question..........
02-11-2010, 05:25 PM
#91
Race Car
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Join Date: Apr 2005
Location: With A Manual Transmission
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If your traqmate allows analog channels and has math channels, then you can do this. You need a min of 200Hz sampling or the data will be pretty much garbage. 500Hz is much better and 1 kHz is even more accurate. This is because the height is changing at a very high rate and you need all the data to filter it properly.
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JK but that sounds beyond my tech level.
02-11-2010, 05:57 PM
#92
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Rennlist Member
Rennlist Member
It's beyond your Traqmate's tech level too. I used a Traqmate for a year and found it very helpful but very limited. I did learn that I would make use of the data and that's what convinced me to spend the money for the MoTeC system. (I use 500 Hz sampling for the shocks so I can see things reasonably well)
Unless you are really inventive and handy (like Jack and his ride height sensors), the cost of the data system to optimize the use of the wing costs more than simply buying 3 different wings and figuring out which is best based on lap times.
Unless you are really inventive and handy (like Jack and his ride height sensors), the cost of the data system to optimize the use of the wing costs more than simply buying 3 different wings and figuring out which is best based on lap times.
02-13-2010, 10:17 AM
#94
Three Wheelin'
Actually, exiting cooling ducts out the topside of the car doesn't help much with downforce, for a couple reasons. First, air going through a cooler slows down dramatically. For example if your car is going 100 mph, the speed of the air through the cooler might be only 30 mph. You won't get much downforce from diverting air going 30 mph. Second, releasing hot air over the top of the car feeds lower density air to your rear wing, which can decrease downforce. So the net effect of having cooling duct exits out the top of the car can be DECREASED downforce. If you look at how prototype cooling packages are designed, they often go to great lengths to duct cooling air out the sides or back of the car whenever possible.
Scott
02-13-2010, 11:31 AM
#95
Actually, exiting cooling ducts out the topside of the car doesn't help much with downforce, for a couple reasons. First, air going through a cooler slows down dramatically. For example if your car is going 100 mph, the speed of the air through the cooler might be only 30 mph. You won't get much downforce from diverting air going 30 mph. Second, releasing hot air over the top of the car feeds lower density air to your rear wing, which can decrease downforce. So the net effect of having cooling duct exits out the top of the car can be DECREASED downforce. If you look at how prototype cooling packages are designed, they often go to great lengths to duct cooling air out the sides or back of the car whenever possible.
Scott
Scott
See for example:
http://www.allcarwallpapers.com/wall...e-car-4859.jpg
And this is a cool pic
http://images.google.com/imgres?imgu...a%3DG%26um%3D1
02-13-2010, 01:32 PM
#96
Three Wheelin'
Going out the sides can be preferable to going out the top - however, going out the sides is often not practical in a production based car and going out the top is preferable to going out the bottom or not ducting at all. A properly designed top exiting center radiator also helps to create downforce because it is directing air upwards. If you think of the car in a control volume sense, any air you can direct upwards through the control volume will help you to create downforce. Many front engines race cars do this such as C5R and C6R corvettes, the old Viper GTSR, the new BMW m3 ALMS cars, and even the new 997 RSR.
Maybe we're saying the same thing ...
Scott
