Hi @Loonie,
Thanks for this informations an the linked page.
Yes, the goal of 100"WC wouldn't be bad
, but this value alone doesn't really say much...
Additionaly, the desired target values for CFM and, above all, the orifice diameter (suction opening = hose diameter) should be indicated...
Only with all these values the real suction power can be estimated
I would be more than happy with 100"WC, 500 CFM for a suction opening of 50mm.
When I read the descriptions for the COBRA and SUPERCELL, I notice a few things:
1) For the COBRA you wrote: 70"WC (245cfm) and for the SUPERCELL 98"WC (465cfm).
-> For the COBRA, the indicated 70"WC corresponds to the maximum suction power and not to the real suction power at 245 CFM. At 245 CFM the suction power is only 23"WC !
And for the SUPERCELL, the indicated 98"WC is also the maximum value and does not correspond to the real value at 465 CFM .... The real suction power (WC) at 465 CFM is unfortunately not indicated!
2) And when I compare the datas of the two ONEIDA devices with various data sheets for suction turbines, then it is very difficult for me to believe this informations from ONEIDA (which does not mean that it cannot be correct
)
If I look in data sheets of turbines, for suction capacities between 70"WC and 98"WC (which corresponds to about 17 to 25 kpa) and about 250 CFM, then it seems to me that these values cannot be achieved at all (not even with 2 or 3 turbines) ....
For values between 70"WC and 100"WC, you either have to accept a significantly smaller suction opening (10 to 16 mm diameter), compared to the ONEIDA specifications:
Inlet Size:
COBRA: 2-1/2" OD ; 2-1/4" ID
SUPERCELL: 4 "OD (ID size not indicated on ONEIDA homepage)
or if you want to achieve CFM values of 250, you have to accept a significantly lower WC value, in comparison to the ONEIDA datas.
If you look at the CFM and WC values of the ONEIDA devices and put them in relation to the indicated suction diameter, then these suction values are remarkable values .... !!
(If all these indicated values are right..!?)
I cannot imagine that ONEIDA, and other manufacturers, does not use standard turbines from the vcuum cleaner turbine market.
I think, it´s unlikely that they use special custom-made turbines....
If interested on unit convertion, this can help:
https://www.convertunits.com/from/water+column+[inch]/to/kilopascal
https://www.convertunits.com/from/l/s/to/cfmregards,