 352 Points
Posted 3 years ago
SCDC, Champion
 46,074 Points
 352 Points
SCDC, Champion
 46,074 Points
Once again we get into an interesting area. This blower pushes about 480 CFM of air, which quite frankly is a lot. I prefer turbo mode because it moves so much air so fast that small rocks and debris are able to be blown away and I get the same results as I would a gas blower.
Now pressure is an interesting thing. These turbine blowers don't have as much pressure. You can stop the airflow easier, but they have better air output. I'm going to blow this answer up, I feel it coming. I wouldn't measure the blower by PSI, but rather amount of air. Here are the only specifications that are available.
3Speed Design Speed 1  High Efficiency: 250 CFM
 Speed 2  High Power: 385 CFM
 Speed 3  Turbo Boost: 480 CFM
So as the motor speed increases, the pressure in the tube also increases and the CFM increases.
SCDC, Champion
 46,074 Points
I found this. Maybe this would shed some light. You will see that this is probably accurate considering if you put your hand over the nozzle and stop the airflow, there isn't much static pressure, so the air just stops.
We can calculate the pressure ratio across the blower using a form of Bernoulli's equation. Without boring you with the details of the calculation, a leaf blower operating at sealevel with an output velocity of 200 mph is producing a total pressure at the exit of 15.4 psia, or 0.7 psig (what your boost gauge would read).
Blue Angel, Champion
 145,388 Points
7.4
:)
Blue Angel, Champion
 145,388 Points
An automotive turbocharger uses a centrifugal fan which is much more efficient at high pressure ratios. They also spin VERY fast... some small turbos spin in excess of 200,000 RPM, and have hundreds of horsepower worth of exhaust powering them.
The Ego blower turns 20,000 RPM, and has a three pound battery pack powering it. :)
The new car engines on the horizon with electric turbos also use centrifugal fans, efficient at high pressure ratios.
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