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Old 02-02-2011 | 12:37 PM
  #34  
victorzamora
 
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From: Greenville, SC
Default RE: Speed Measuring?


ORIGINAL: sloppyG

the pitot tube won't work properly in a car, it's going to get odd readings as it's so close to a solid object (the ground)
and the slower you're going, the larger the error is going to be.. these things were designed to measure aircraft speed and to be accurate in a range of speeds that are much higher than most RC cars are going
Like I said, though, as long as you mount the pitot-static probe above and in front of your car you'll be fine. Also, the "range of speeds" that the EagleTree is accurate in is 2mph up (I can't remember the top range, but it's up there!)....and if your car isn't capable of doing 2mph it's either a rock crawler or you have some serious issues. Anything above 30mph should give you pretty accurate data, as long as your pitot-static probe is above like 6 inches off the ground. And actually, you could mount it really low so as to negate wind effects.

You know what, now that I think about it...you want the pitot-static probe LOW and out in front so you can call wind effects negligible. Haha, way to use all of your fluid dynamics courses there, Victor! Guess I shoulda thought it through the first time!! Oh well. Point is:

PItot-Static probe low and forward will give you great readings!!
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