Close-up pictures of the impeller are here:
==========There's an impeller made from six half-inch nylon blades bolted to an
aluminium hub. The blades are bolted from the back using three 2" long
1/4" bolts threaded straight into the nylon.
The vanes have a profile milled into them to make them lighter. Michael
cut that profile with his CNC mill.
The original sides of the blower were made from aluminium soffit
material. But with the occasional pine cone, pebble, or walnut in the
mix, that became quite dented.
Before starting the leaves this year, Michael replaced the sides with
18-gauge galvanized steel. That should be able to take much more abuse
than the aluminium.
Michael used a Bill Penz blower design to base his blower on.
I asked Bill Penz for permission to use this image. Bill Penz added:
"Please warn then that if they dont use a material handling impeller
(meaning plastic or aluminum) or if they hit a branch or rock they could
get seriously hurt. Id also recommend making the blower with a double
With the engine running at 3500 RPM, the tips of the fan blades travel
at about 65 meters per second, or about 234km/h (146 MPH). That's fast,
but not bullet fast, so a reasonably sturdy enclosure should be able to
contain a catastrophic impeller failure.
Michael Grant does custom electronic designs: NoMi Designs
and other stuff: Krazatchu Design Systems
With many acres of woods surrounding my house I still have never had the
need to vacuum leaves, just mow/mulch them. They are good for the soil
and the trees. Nature intended for the leaves to lay under the trees,
why move them?
In principle I agree with you, but I still have to go to work, and I
don't want the neighbors to torch my place while I am gone. I don't get
anal about it like they do, but I relocate most of the leaves, if
weather and first snowfall permit. Thankfully, I have a tree line in
back to dump them in, so I don't have to mess with bagging/burning/hauling.
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