Strongest cordless upright yet? Karcher BP

[blackheart]

After the testing of the Corded Ranger 12 it left a few of us wondering how the cordless version would fare, now we have an answer.

The Karcher Sensor BP has the most airflow of any cordless upright so far. This mistreated specimen was measured in at 68.85 CFM more than some corded uprights!
The next strongest cordless upright would be the Hoover onepwer, measured by vacuumwars at about 52 CFM

It's nearly as powerful as it's corded counterpart which measured in at 74.49 CFM

 

[mike811]

Must be the strongest cordless upright ever made.
69 nozzle cfm is very impressive. Very close to Sebo Felix with 74 nozzle cfm. That makes it outstanding for a cordless.
Must be that belt driven "overdrive" fan what spins faster than the traditional fan in the motor shaft systems.

 

[eurekaprince]

This is a great refresher of some of my college physics lessons! Something about pulleys and gears. So as I see in the picture, the larger wheel at the motor makes the spindle at the fan spin faster than the motor’s “rounds per minute” rate. Correct? In other words, by adding a wider wheel on the motor’s spindle, it makes the fan spin faster. So one turn of the large wheel on the motor end results in maybe 10 spins of the smaller wheel at the fan end. Fascinating…..

 

[blackheart]

Right

I can't remember much from the high school physics class either. but yeah in this setup you have the same rpm but he larger circle will have a longer path You both understand this but to help others, probably younger members grasp the concept here's an example. Unfortunately I can't remember the correct terminology for this....anyone?

 

[justjunque]

Science, math, etc, my eyes just start to glaze over. So, this probably won't make sense.
But, if I could make another analogy; it's kind of like the chainwheel on a bicycle. The chain goes around the larger "sprocket" where the pedals are, and back to the smaller one that's attached to the rear wheel. So the wheel will turn faster than you're pedaling. Or something like that. Maybe?
Sorry. I'll give it back to the people who know what they're talking about.

 

[evolutionclean1]

Honestly I am

Fascinated that they decided to go with an indirect drive system for the fan. Leave it to Sebo to always be doing the unexpected, in the name of efficiency.
The only other machine I can think of offhand that had a belt driven fan was the elusive AirWay RugMaster. That is if I'm remembering correctly

I'm not typically one for direct air machines for major cleaning, most of the time I'm hesitant to use my Sanitaire or Powr Flite as my ears start to complain after a couple of hours.
I am curious about the corded ranger though! The price is decent enough and I'd imagine the overall quality is just as good as we've come to expect. Maybe in the next few months the local shop will bring one in to see how he likes them? I'll have to ask next time I'm in