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  #11  
Old 02-24-2012, 08:27 PM
tjo tjo is offline
 
Join Date: Dec 2009
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My experience with automotive brakes says that, it will not change your brake performance, including cooling. In other words, the brakes will not run cooler. It will not help with disipating gases because modern brakes pads don't need the gas paths. It will, however, introduce stress concentrations in the disk, so if you do it, I would look carefully at the brakes often. Not enough of a riskto say don't do it, but something to think about.

In my opinion, it is not worth the weight benefit, but that is just me.

Tim
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  #12  
Old 02-24-2012, 09:30 PM
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Ironflight Ironflight is offline
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Two ounces? Consider eating one less taco for lunch.

I have always been amazed at just how small and light the brake rotors are on our airplanes, considering how much energy they have to take to get us stopped. I'd be hesitant to simply start drilling holes without some real engineering study. If you read the daily accident reports from the FAA, more mishaps occur during landing roll out than in any other phase of flight - brakes are a primary control dung that phase - I wouldn't skimp on them.

Paul
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  #13  
Old 02-25-2012, 07:48 AM
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speyers speyers is offline
 
Join Date: Nov 2005
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Two OZ... why don't you remove the passenger seat cushion that weighs at least two POUNDS!
If you try it we would all love to hear how it works out though! It is EXPERIMENTAL after all... have fun!
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  #14  
Old 02-25-2012, 09:09 AM
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Andy Hill Andy Hill is offline
 
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I know little about brakes... However, we are looking at alternative brakes (from Cleveland) to save weight on the RV-3, and 99% likely to use Beringer - who not only do aircraft brakes, but also motor sport.

Firstly, their aircraft discs do not have holes.

Secondly, they were keen for us to use the "high energy" brakes for an RV. We will not, since it negates the weight savings, so might as well use Cleveland. What is of interest is that their standard brakes have Energy Absorbtion significantly better than the Cleveland (144K ftlb v 117.5K). Now look at FAR 23.735 and my calcs show all OK for an RV-3. But for the 2 seat RVs, I reckon the standard Cleveland brakes do not meet FAR 23.735.

This is not an issue for those who use brakes sparingly. Those who post videos on here showing "short landing runs" that are really an exercise in how hard one can press the brake pedals (rather than showing a decent approach and landing technique) might be in for a nasty surprise

So then drilling holes on the discs just reduces this energy abosrbtion (KE) value further, as well as the torque available

My suggesiton would be, if you want light brakes, do it properly and get a lighter set than the Cleveland, but use as designed. I suspect when you see the price, you might decide to stick with Cleveland though
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