Ed Anderson wrote:
>
> That old saying "..If it looks too good to be true ......"  is hard to
> fault.

Well, here's my attempt at collecting some real data.  An electric leaf
blower...used.  The tip is constricted to three 3/4" holes that are
advertised to produce 95MPH air.  I've measured it at closer to 80MPH,
which I find more believeable.  The fan is 5" diameter, and has a
removable shroud that exposes more of it so that it can be used as a
leaf vacuum/mulcher.  It's rated at 12A/120V and has two setting.

I stuck a 3/8" tube down one hole, fed the pressurized air into a bottle
of colored water, which was pushed up a 1/4" tube.  The tubes were held
into the bottle cap with a squirt of hot glue.    I tested it full open,
and then closed off each of the holes in succession.  The last
measurement was a full static test.  I then removed the shroud and
tested again.

                      Low setting(in H2O)             High setting(in H2O)
Full open           12.75                                          19
1 closed             14.25                                          20.75
2 closed             15.375                                        22.25
Full static          15.75                                          23


No shroud
Full open           8.5                                              12.75
1 closed             8.75                                            13.25
2 closed             9.25                                             13.5
Full static          9.25                                            13.75

I take away from this that:
- I will be able to make significant manifold pressure, even with a
sub-optimal solution.
- that the shroud will be the most important factor.  A secondary effort
may be to get some of Ed's magical polyurethane casting goo to build an
optimal shroud.


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