Well thanks to this thread, the wife has given me the go ahead for buying a zipper in the spring. 



Engineering rule-of-thumb says it takes at least 5000 feet-per-minute of velocity to adequately convey material through the hose. For 2.5" hose that's 170 cfm (as a comparison, 2" hose requires only 110 cfm to achieve 5000 fpm). Both machines open flow is nearly double that figure, and both machines spec at 13" hg vacuum.
Agreed that the higher lift could produce better performance, and better velocity through the hose - but only if you engineer everything as a system. If you keep using the same wand, the higher lift could just cause lockdown on the carpet, perhaps even lowering the cfm. Everything must be considered together to achieve the best results. IMO.That is exactly why TM's should have higher lift levels (16-17").
Sorry, swivel wand.What was Tom' swivel?
You would have done it anywayWell thanks to this thread, the wife has given me the go ahead for buying a zipper in the spring.![]()
yeah, but getting the ok from you was nice.You would have done it anyway![]()
Thanks to everyone who bought a Zipper and is liking it.I hope it gives you years of service.
The only tool I bought in 2015 is a 10" Brush Pro, and I love it. Thanks Rick & MB.
Hello Larry, I find your results confusing. Why don't you repeat the test using only 1 wand. Run your tm at the same rpm at 16in then at 13 in and see what the difference in airflow is. As far as I know, the airflow should be the same. For example a 4ml sutorbilt develops 284cfm at a specified rpm. regardless of what the relief valve is set at. It shouldn't matter what the lift is, the airflow should be the same because that is what the blower is providing at the set rpm. Dual wanding will be different because you may using more airflow than the blower can supply. if that makes any senseThat is exactly why TM's should have higher lift levels (16-17").
We got 200 CFM with the 2" Bentley @ 16" with an accurate CFM meter at this test:
http://www.cobbcarpet.com/zen/index.php?main_page=document_general_info&cPath=63&products_id=5319
Cut 8 inches out of the middle of the hise and insert 8 inches of pipe back in. With an inch of over lap on both end.Mike, I bought an older hoss 700 that has the old grey hose, I'm switching it to the clear hose. Can you show a pic. where you put the plastic?
Mike, I bought an older hoss 700 that has the old grey hose, I'm switching it to the clear hose. Can you show a pic. where you put the plastic?
Good looking truck Scott!View attachment 12232 2013 Aerotech XT Isuzu NQR
2 Zippers 17" and 15"
used Hoss 700
About a thousand on new shelving from Aerotech, love the shelving.
Wall Huggers and yard sticks from everyones "Buddy Bristor"
Dude! That is gorgeous!View attachment 12232 2013 Aerotech XT Isuzu NQR
2 Zippers 17" and 15"
used Hoss 700
About a thousand on new shelving from Aerotech, love the shelving.
Wall Huggers and yard sticks from everyones "Buddy Bristor"