re: revisiting greywater in a drum SOLAR.KnowledgePublications.com

re: revisiting greywater in a drum
24 apr 2005
>we might make 7 kerfs 8.26" apart in a 35"x66" piece of 1" foil-faced
>foamboard, as below...

>20 pi=4*atn(1)
>30 ro=22.5/2'inner drum radius (inches)
>40 n=8'insulation board number of sides
>50 t=.5'insulation board thickness (inches)...

oops.

20 pi=4*atn(1)
30 ro=22.5/2'inner drum radius (inches)
40 n=8'insulation board number of sides
50 t=1'insulation board thickness (inches)
60 theta=2*pi/n'angle per side (radians)
70 rimax=ro-t*cos(theta/2)'outer board radius (inches)
80 k=2*rimax*cos(pi/2-theta/2)'distance between kerfs (inches)
90 l=n*k'foamboard length (inches)
100 lc=2.54*l'foamboard length (cm)
110 dimin=2*sqr(rimax^2-(k/2)^2)
120 boardgap=ro-(dimin/2+t)
130 print n,l,dimin,boardgap
140 d=2.54*l/n'kerf spacing (cm)
150 for k= 0 to n
160 print k,k*d
170 next k

# sides       foamboard length   foamboard id     drum-board gap
            
8             63.22615 (in)      19.08018 (in)    .7099085 (in)

kerf #        distance from end

0             0        (cm)
1             20.0743
2             40.1486
3             60.2229
4             80.2972
5             100.3715
6             120.4458
7             140.5201
8             160.5944

nick