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Old 03-16-2019, 12:19 PM
 
46 posts, read 15,771 times
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how is it possible that 2 leaf blowers/vacuum have different mph with the same cfm and still have the same noise level of 50 db? One is Worx 120 mph 350 cfm 12 amp and the other is 210 mph 350 cfm 12 amp. Like I said both of noise level of 50 db. Base on 50 db it's safe not to use ear protection but I see people using ear protection when using this.
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Old 03-16-2019, 05:51 PM
 
6,159 posts, read 2,787,023 times
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How about a rake?
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Old 03-16-2019, 08:55 PM
 
Location: Sarasota FL
6,865 posts, read 9,549,202 times
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^^^^
Did you ever notice that people who use a blower never have any leaves to bag? They blow the leaves on their neighbors property or in the street.
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Old 03-16-2019, 11:51 PM
 
46 posts, read 15,771 times
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Quote:
Originally Posted by turf3 View Post
How about a rake?

all it does is just keep digging more
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Old 03-17-2019, 05:51 PM
 
6,159 posts, read 2,787,023 times
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Originally Posted by AstralProjection View Post
all it does is just keep digging more

Just means you need to learn how to use it. Practice, practice. We're not talking about rocket science here.
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Old 03-22-2019, 03:49 PM
Status: "living in a political world, where mercy walks the plank" (set 17 days ago)
 
Location: Bel Air, California
21,746 posts, read 22,551,582 times
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Quote:
Originally Posted by d4g4m View Post
^^^^
Did you ever notice that people who use a blower never have any leaves to bag? They blow the leaves on their neighbors property or in the street.
who's to say they didn't blow over from the neighbor's trees in the first place? just returning them to their proper owner.

can a rake do this?
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Old 03-23-2019, 06:01 AM
 
40,286 posts, read 41,836,137 times
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Quote:
Originally Posted by AstralProjection View Post
how is it possible that 2 leaf blowers/vacuum have different mph with the same cfm and still have the same noise level of 50 db? One is Worx 120 mph 350 cfm 12 amp and the other is 210 mph 350 cfm 12 amp. Like I said both of noise level of 50 db. Base on 50 db it's safe not to use ear protection but I see people using ear protection when using this.

Assuming the CFM is accurate the only thing that would explain a difference is the size of the hose/nozzle.
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Old 03-25-2019, 01:07 PM
 
Location: God's Gift to Mankind for flying anything
5,374 posts, read 11,285,294 times
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Quote:
Originally Posted by AstralProjection View Post
how is it possible that 2 leaf blowers/vacuum have different mph with the same cfm and still have the same noise level of 50 db? One is Worx 120 mph 350 cfm 12 amp and the other is 210 mph 350 cfm 12 amp. Like I said both of noise level of 50 db. Base on 50 db it's safe not to use ear protection but I see people using ear protection when using this.
The specs do not control the noise level.

The design of the motor, the blades, the shape of the outlet determine the nose level during maximum output. Most of the noise is generated by the motor and the blade design.

If the output (CFM) is the same, I would buy the higher mph wind speed. Gets the whatever is laying on the ground moving earlier and faster!

I would 'always' wear 'ear and eye' protection when using 'any tool'.
(maybe not always ear protection, but ALWAYS eye protection!
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Old 03-27-2019, 02:30 PM
 
Location: The Berk in Denver, CO USA
14,390 posts, read 21,075,024 times
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Quote:
Originally Posted by AstralProjection View Post
how is it possible that 2 leaf blowers/vacuum have different mph with the same cfm and still have the same noise level of 50 db? .
Lying.
Alternative facts.
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Old 03-27-2019, 03:45 PM
 
6,159 posts, read 2,787,023 times
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Quote:
Originally Posted by davebarnes View Post
Lying.
Alternative facts.
Well, windspeed developed is cfm divided by the exit nozzle area.


Noise is governed almost totally by the details of fan design. Tip speed, whether the fan is a ring fan or open tips, passing frequency across structural elements, whether it's got backward or forward curved blades, etc., etc., etc. are all factors that drive noise generated by a fan.
Heck, the two units could have completely different fan types altogether.


It is absolutely possible that two units with the same rated volume flow rate and different output velocities could have the same noise output.


So, unless you happen to be a turbomachinery expert who also knows the details of the fan design of each of the two units being described, you have absolutely no grounds for asserting that anyone is lying or is not lying.


Are you qualified to comment, or not? Let's hear your experience in fan design.
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