Hoover Convertible Doesn't Lose Airflow?

All,

When I put my 70's Convertible (U4007) on my airflow box, I measured several things. Take a look at what I found:

1) With the brush roll off, installing a "C" bag reduced the airflow by 8.7 CFM
2) With the brush roll on, bag or no bag didn't change the airflow at all.
3) Installing a belt and having the brush roll spinning reduced the airflow by 18 CFM.

The spinning brush roll uses much more CFM via motor drag than a bag, hence you could fill a bag partway and NOT ACTUALLY LOSE ANY AIRFLOW!

GULP!

How many bagged vacs can say that? I'm guessing (and it's a complete guess until I finish testing) that a cloth Hoover "Q" bag might be filled up halfway before any airflow is lost. This is Earth-shattering news to me! A bagged vacuum that doesn't lose CFM for a significant period of time? Even Kirbys with giant HEPA bags can't claim that.

Bill


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Post# 369012 3/23/2017 at 16:54 (2,584 days old) by wyaple (Pickerington, OH)
Checkrate/Likes 1 All, When I put my 70's Convertible (U4007) on my airflow box, I measured several things. Take a look at what I found: 1) With the brush roll off, installing a "C" bag reduced the airflow by 8.7 CFM 2) With the brush roll on, bag or no bag didn't change the airflow at all. 3) Installing a belt and having the brush roll spinning reduced the airflow by 18 CFM. The spinning brush roll uses much more CFM via motor drag than a bag, hence you could fill a bag partway and NOT ACTUALLY LOSE ANY AIRFLOW! GULP! How many bagged vacs can say that? I'm guessing (and it's a complete guess until I finish testing) that a cloth Hoover "Q" bag might be filled up halfway before any airflow is lost. This is Earth-shattering news to me! A bagged vacuum that doesn't lose CFM for a significant period of time? Even Kirbys with giant HEPA bags can't claim that. Bill

Post# 369038 , Reply# 1 3/23/2017 at 20:53 (2,583 days old) by compactc9guy (Bathurst NB)
Checkrate/Likes *reply* Very interesting keep me posted . I dont have any hoover but electrolux tank and compact c9 maybe i should test humm