How many pounds of thrust does a fully charged blower produce on TURBO?

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How many pounds of thrust does a fully charged blower produce on TURBO?
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James

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Posted 3 years ago

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SCDC, Champion

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I think all blowers are measured by CFM.  Cubic Feet per Minute of air the blower moves, and they often use MPH.  I don't want to confuse my answer here.  If by thrust, you mean hold your hand against the blower and how much force it produces?  All new blowers now use turbines, which produce a lot of CFM, but I don't know about "thrust".  I might leave that answer to Blue or Dave.   :)
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James

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Maybe I mean boost like in an auto turbocharger (about 5-8 psi).
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SCDC, Champion

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Official Response

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.

3-Speed 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. 

(Edited)
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SCDC, Champion

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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 sea-level 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). 

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Blue Angel, Champion

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"How many pounds of thrust does a fully charged blower produce on TURBO?"

7.4

:-)
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SCDC, Champion

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I knew I could count on you buddy.
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Blue Angel, Champion

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Seriously, these new turbine style blowers are great at moving lots of air volume at low pressure. SCDC is correct.


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.
(Edited)
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Tim1951

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I rarely use the turbo button as the high speed does the job very well.
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giggleherz .

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I just want to know how fast can I go on a good skateboard with an EGO leaf blower on turbo?
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