Kirby and Royal
Yes the Royal beats out a Sentria in terms of pure flow, Bill has measured in 127 cfm for his sentria II and that's about what I got measuring an Avalir, As well as CFM Density. But Strangely my old Legend II narrowly beats it in flow (but not density) at 142.67.
This got me thinking the royal should have the advantage. It not only uses a higher wattage motor but i've heard their fans are deeper than Kirbys. Kirby is also running it's transmission off it's motor on current models. So why is it that the Royal doesn't vastly surpass Kirby? It's the airpath!
A royal's airpath is narrower the bag tube tapers towards the base, has deep groves and i've always felt that a square or rectangular airpath negatively effects airflow.
A Kirby's airpath is both wider and smoother There's a small different at the "bag horn" but the major difference is in the filltube it has a larger area to it and while it has groves all the way along it they are much less pronounced than the Royal's
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