Looney Labs Icehouse Mailing list Archive

Re: [Icehouse] Size for 4 - 6 pointers (Was: Giant Martian Coaster boards)

  • Fromkerry_and_ryan@xxxxxxx
  • DateWed, 10 Jan 2007 20:04:01 +0000
 -------------- Original message ----------------------
From: "Don Sheldon" <don.sheldon@xxxxxxxxx>
> Each step is 3/8ths of an inch taller and approximately 7/32nds wider
> (actually 3/14ths, but good luck finding that on your ruler), so a six
> pip would be 2 1/8" tall and 1 21/32" wide.  Approximately.  (Actually
> 1 9/14")

3/14???  Let's try that again?

Pips / Width / Height
1 / 18/32 / 32/32
2 / 25/32 / 44/32
3 / 32/32 / 56/32

Therefore...
4 / 39/32 / 68/32
5 / 46/32 / 80/32
6 / 53/32 / 92/32  which is indeed 1 21/32 wide, but I'd say 2 7/8 tall. 

In general...
x / (7x+11)/32 / (12x+20)/32

From: Christopher Hickman <tophu@xxxxxxx>
> >  And I think that IS linear growth, pretty much by definition.
> 
> Yeah. You're right.  I realize now what I thought I meant: the angles are not 
> constant.  As the pyramids get bigger, the get more squat (that is, the linear 
> growth of the base width is a larger ratio to the linear growth of the height).  
> So, if you were to take a hypothetical 10 pointer and cut of the top 1 inch of 
> the tip, it would NOT be a 1 pointer, because it would be waaaay too wide.

Using the linear progression we've discovered, a -11/7 pip pyramid would have zero width and a height of 8/224 of an inch (0.03(571428)").  :-)

Ryan