Dyson DC65 Airflow Losses

[wyaple]

The first two measurements were easy to get, the last one (CFM at the nozzle) required me to build an airflow box. I think this pic should easily illustrate where and by how much CFM is lost in this machine. I think this is typical performance from a cyclonic bag less cleaner.

From the base of the machine through the cyclones and to the nozzle, there is a loss of 120-52 = 68 CFM. This is the second highest airflow loss I've recorded to date, about 57% of the cleaning power is lost through the cyclones.

Last note: the rug plate opening is a little below average (about 22 square inches) and the CFM density is below average as well, about 2.3 CFM/Sq. In. While it'll do an OK job on top of the carpet pile, deep down cleaning will be difficult for this 11 Amp beast.

Bill

 

[sebo4me]

That is a huge loss! I'm beginning to go off bagless!

This is what i've always thought a lot of these cleaners look good on low pile carpets but that's not a real test.How well will they do on thicker pile carpet that is a better test.

I hope James gets to see your results

 

[sebo4me]

Thank you for all the info Bill I have learnt a lot from it

 

[alexhoovers94]

I love my Dyson DC55 I think it works great, best Dyson upright I have used.

 

[sebo4me]

I thought it was good until I saw these results. I like the way it handles and manoeuvres but if these figures are correct I'm sure they are then it's not going to deep clean that well only surface clean.

I'm going to use bagged cleaners in future. I wish Miele would make an upright with a 12" floorhead!

 

[n0oxy]

typical bagless

This is not surprising, and is very typical of what happens with bagless vacuums. This is why it's always best to stick with a bagged vacuum, when you replace your bag, you are resetting your vacuum's primary filter. With bagless vacuums, even if you empty and clean the filters, there is fine dust that will get in to parts that are not replaced.
Mike

 

[sptyks]

Marcus,


 


How wide is the Miele S7 upright's floor head? Is it 14"?


 


 

 

[sptyks]

Marcus,


 


How wide is the Miele S7 upright's floor head? Is it 14"?


 


 

 

[sebo4me]

Yes 14". It wasn't a success in the UK. Retailers don't stock it anymore.

I don't think big heavy vacs are popular in the UK as they are over the pond.

I think a lighter 12" nozzle might be. But then again most want bagless.
Maybe one day bagged will make a comeback. I'd love to see more bagged uprights!

 

[crazykirbydude]

WHAT?!!?!?!??!!?!?

52!?!?!?!? My Electrolux Model G runs circles around this! Why did you waste $700 on this piece of trash?!?!?

 

[wyaple]

Adin,

I didn't waste a single penny on this machine. It was a curb find on trash day in front of a $250K home. They replaced their DC65 with....wait for it...a Shark Rotator. It appears to be a case of "never loses suction" also means "never have to empty it and/or clean the cyclones". A full disassembly, soak, scrub, rinse and I now have a nearly perfect DC65 that is just like new.

The maximum I pay for any machine I find in thrift stores (including Rainbows, Kirbys, Simplicitys, etc.) is $20.

BUT, I do feel somewhat sorry for the unfortunate person that did fork over $700 for this vacuum. And yes, $700 USD for 52 nozzle CFM is quite a poor deal, that's why I'm the crazy idiot posting these results.

Bill

 

[mike811]

Very Poor indeed

LOL! My 32 years old Philips P74 Electronic canister pulls almost 90 cfm from the hose end and it's very quiet.
To be honest this is not surprising at all. Multi cyclonic vacuums are worst what it comes to airflow.
Multi cyclonic system has so overly complex airpath that airflow will suffer A LOT.
Best single cyclonic vacuums has a enough good separation and airflow don't suffer nearly as much.
Some manufactures don't even want to make multi cyclonic vacuums, because of the huge airflow loss like the Miele and Electrolux. Electrolux has just a one multi cyclone vacuum. Rest is single cyclone designs.

 

[sebo4me]

Be interesting to see what the bagless Miele Blizzard will score

Shark only has one cyclone.Id like to see the results of that too.

 

[mike811]

Shark & Electrolux

My point was that well designed single cyclone vacuums can have pretty good airflow. Shark Rotator has only 2 = 62 cfm from the hose end. Electrolux UltraFlex has almost 5 = 85 cfm from the hose end. Both are single cyclonic vacuums.
It sure would be interesting to see what Miele pulls.

 

[alexhoovers94]

You are all very particular on your suck aren't ya?

 

[crazykirbydude]

SERIOUSLY?!?!

THEY PRETTY MUCH BOUGHT THIS JUST TO THROW IT OUT!!!! WHY ARE PEOPLE SO WASTEFUL?!?!? Keep your eye out for that Rotator, in a year it will probably be tossed too.

 

[wyaple]

Adin,

Got a DC14 for free as the brush roll was clogged with hair and the machine was making a funny noise.

Got a DC25 for free as the owner couldn't be bothered to empty the dust bin and clean the brush roll. A trash find at the curb.

Got a DC65 as the owner couldn't be bothered to empty the dust bin and had sucked up something fairly moist and very black. Found at the curb.

Got a Hoover Windtunnel MAX as the owner couldn't be bothered to empty the dust bin and clean the brush roll, so out to the curb it went.

Got a Hoover Windtunnel 2 Pet because owner couldn't read the solid red indicator that meant please empty the dust bin. He triggered the thermal overload and thought the machine was toast. He bought a Windtunnel 3 and still doesn't quite understand how the bag indicator works. Some months later he proudly showed me a solid green indicator as a testimony that his new machine was doing well and I said "that's nice, but can we turn it on and check it?" You know the result, it showed about 75% in the red.

I'm actually waiting for a Rainbow E2 2-speed to be out at the curb that the owner will not have changed the water in a year and the machine will smell like mold.

I knew one person at my last contract job that actually planned to buy a new Wal-Mart $50 cheapie vac every year by purchasing a 2 year extended warranty, then bringing in the clogged year old machine and exchanging it for a new one. He's been doing this for years and Wal-Mart doesn't notice or care.

Oh, and I'll be looking for the new Shark to be at the curb in a few months...

Bill

 

[mike811]

DC65 cleaning performance

Another Kirby sales demo or true performance difference?

 

[alexhoovers94]

I don't understand tests like that...

You can't compare chalk with cheese.