Ha! I knew it! I am claiming victory on this once and for all!
Bill - We now have 2 videos, done by another Vacuumland member who has NOTHING to gain over this, that has proven you & Stan are WRONG. You can make claims & deny all you want. You, Bill, are grasping at straws here, & you know it. I think it's about time to give in, admit defeat, & admit you were wrong on this topic. And, might I also add, being foolish for making such a claim without being smart enough to test a modern canister to validate your own statements.
Make all the claims you want about Mikko's rug being low density pile & large flow through holes, that's a bunch of BS & you know it! And again, claiming the Kirby picked up all that fine particulate with a nozzle opening 59% larger & 14% less CFM density. If you're going to use claims like that to prove a direct air upright is so much better, consider this....not only did that Nilfisk canister leave only about 1% or 2% more flour behind, it did it with (according to you) less CFM, AND to boot losing some of that CFM through the hose, wand & powerhead connections. I find that impressive in itself.
As for your claims on Mikko's first test with rice....Well, I would take a machine that has only 50 CFM with the Bag Saver attachment. Your Hoover TurboPower 5000 surface debris test video shows that you can still have decent cleaning with low CFM. Even Mikko's final video with the flour under the rug shows a Shark upright with (according to Bill) 51 CFM, possibly slightly higher, cleans just as well. So, yes, I will jump on the bandwagon that a low 50 CFM machine can clean just as well as a 120 CFM machine. Bill, you seem to forget there are numerous other factors at play BESIDES high CFM that determine how well a vacuum deep cleans: Bag & bag chamber design, nozzle design & how stiff the brushes are, how restrictive the exhaust filter is, etc.
As for using the Bag Saver on the Nilfisk being inaccurate to determine how much was really left behind, & the Kirby with a Dirt Meter installed being a more accurate way to determine what was left behind due to it's higher CFM rating? Well, that might hold true if the Kirby Dirt Meter pads were made of HEPA Cloth material, not paper. The Dirt Meter, due to it's paper pad, even when the pad is clean & new, drastically reduces it's performance; I would say it drops the airflow on a Kirby Avalir from 137 CFM down to somewhere around 95-100 CFM. Also, it's a well known fact the Dirt Meter & paper pad robs a Kirby of it's performance while in use....go ahead & watch a couple YouTube videos of it in use, & it's clear how quickly the Kirby loses it's power. Therefore, using the Kirby with a Dirt Meter & paper pad installed would NOT be a accurate way of picking up the rest of the dirt left behind from each carpet, & to determine which vacuum cleaned better. In fact, despite the lower airflow the Nilfisk with the Bag Saver installed would have, it would actually be superior for this type of test, since there is NO filter to clog whatsoever.
Finally, I think one thing that everyone has ignored here, is that Mikko's Nilfisk canister is actually a pretty old, outdated model by today's standards, I believe it is most likely from the late 90's/early 2000's by the look of it. And, it is only average power at best....the current Nilfisk Museum Vacuum line the company currently produces only produces about 85" to 90" waterlift, which would explain Mikko saying it pulls 109 CFM, a current Miele C3 canister in comparison pulls 100" waterlift & 145 CFM. So, obviously a newer model canister, such as a Miele, Riccar/Simplicity, Sebo, Lindhaus, Aerus, Perfect or Kenmore would fare much better in the flour under the rug test. Bill, even your old Electrolux Olympia fared decently in your own flour under the rug test....if it had a PN5 or PN6 with the new style 10 degree brushroll, it would have fared even better, & most likely would have aced your test.
Stan - As for your assertion that the Kirby G6 is outdated & having only 121 CFM, & the Sentria II & Avalir being more modern & having 137 CFM & your Royal 8300 having 144 CFM? Well, that would be easily overcome if Mikko had flipped up the headlight & inserts a small pocket-sized flat blade screwdriver to activate the top speed switch & make the G6 run in HIGH tool speed mode during testing. That HIGH speed should EASILY make the G6 match or exceed the Sentria II, Avalir or Royal 8300's performance levels. The only variable we don't know, & only Mikko can answer this, is whether his Kirby G6 has the older chevron brushroll or the newer oblique style brushroll with stiffer bristles. But, again, that too is easily overcome if Mikko puts the brushroll endcaps in the 3rd wear setting so they provide the maximum agitation that brushroll can allow. So, that blows your claim of the Kirby G6 being outdated & not a fair comparison to a modern Kirby right out of the water. Besides, let's be realistic - the average consumer is likely going to have a older Kirby G Series machine to use at home anyways.
So ya know what boys? At the end of the day, the ONLY thing you have proven is you both are a couple of stubborn old men, standing behind old, outdated technology, & making ridiculous claims. And, when proven wrong, come up with petty excuses to defend yourselves & make yourselves look good.
Bill, you want to redeem yourself & those idiotic claims you have made? Then put your money where your mouth is, buy yourself a modern canister & do the test on YOUR rug which you claim would produce more accurate test results with the under the flour test. I DARE YOU to go ahead, get a Miele or Riccar/Simplicity canister that is a current model, & prove me wrong! We all know here you don't have the guts to do it, because you KNOW I am right & you'll wind up with egg on your face.
Rob