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Unread 07-01-2017, 21:49
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Re: Fuel Seems Undercosted

Quote:
Originally Posted by faraz5557 View Post
I'm going to dispute your 3.41 cubic feet figure (I'm getting like 4 cubic feet, 26 in tall cylinder with an approximately 9.1875 in radius which is less than the given number of 10.5 in bc the tube is lower radius than the frustrum), but more importantly how did you get 40? 3.41 cft is 5892 cubic inches, each ball is 65.5 cubic inches for 90 balls, but since sphere packing is only about 74% efficient this is 66 balls in only the cylindrical and frustrum part of the boiler room. How did you only get 40 balls?
Quote:
Originally Posted by Jamesa47 View Post
74% packing efficiency is maximum possible if you pack perfectly, in reality I think it should be more around 60-62%.

I addressed it in a little more detail here:

https://www.chiefdelphi.com/forums/s...d.php?t=153169

It should be more around 54 or so? I may have calculated that inaccurately but it's a bit less than 66 balls.
Again, as explained by the numerous "about" and "approximately" disclaimers, my numbers were a quick 15 minute back-of-a-napkin estimate. With either number, the possibility that enough fuel can be constantly supplied to overflow the high goal is very slim in my opinion.

I suppose the best way to know for sure is have someone dump a bunch of balls in the high goal of an official field boiler. I think that one is on a shipping container as we speak though...
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