> Maybe better check your flow rate units; gpm vs cfm.  20 cfm is

> way too

> high.  For a 2-rotor you'd probably need a max of around 25 gpm, which

> is about 3.5 cfm.

 

 

In the immortal words of Homer Simpson:  DOH!!

 

Here is revised data using an absolute minimum flow rate of 20'g'pm.  25 should probably be a design minimum, but I from what I've read, 20 can handle the load except in the most extreme conditions.

 

            14ft                  6ft                    2ft

dia      wt        psi       wt        psi       wt        psi

 

.5         4.76      46        2.04      19.7      .68       6.57

.625      7.44      15        3.19      6.46      1.06      2.15

.75       10.71    6          4.59      2.6       1.53      .87

.875      14.58    2.8       6.25      1.2       2.08      .4

1          19.04    1.44      8.16      .62       2.72      .21

1.125    24.1      .8         10.33    .34       3.44      .11

1.25      29.75    .47       12.75    .2         4.25      .07

 

This data makes my proposed radiator placement a little more feasible.  Using a 7/8" tube I'd get less than 3psi backpressure and add 15lbs of water.  Using the EWP will save me about 8 of those, so I'm looking at adding about 7lbs and eliminating seperate intakes for cooling.

 

You might also want to check your units for the weight.  I don’t know what your including, but those seem too high.  1” dia of h20 6’ long would weigh about 2 lbs.

 

.785 x 72 = 56.5 cu. In.

 

Water weighs about .037 lbs/cu. in.

 

Al