QUOTE(bowl @ Oct 24 2019, 01:59 PM)
Dear Master Sifu, Thank you so much for the article you share. From what i study
1.) 4 blades is optimum but depend on motor power also. In this case how we know the power of K14Y5-GY (69 watts) is good for 4 blades or 5 blades? If i read the rubine fan manual it say it motor is 85 watts but with 5 blades in this case is that rubine is better?
2.) For Noise wood < plastic < metal but air flow is Metal > plastic > wood. If room all put thet K14Y5-GY then will be very noisy although it can generate more wind? because the blade is metal.
3.) Finally if i not mistaken blade pitch & blade angle is same things. KDK K14Y5-GY the blade look like flat. That mean it generate less air flow?
Actually i am very firm that 1 V-touch (if got budget senza) for living room but for other 6 rooms. I been thinking shall i should put all egg in 1 basket that mean all 6 pcs fan also buy KDK K14Y5-GY or half KDK and half rubine.
I been try searching rubine fan review but seem like very less. This is the rubine product details can you give me some advice?
https://www.rubine.com.my/product_manual/VettaPicco.pdfThank You Master Sifu
1.
Between 4/5 blade they should have similar dB (noise rating) of the KDK K14Y5-GY / K14X5-GY. Residential use fan won't make lots of noise unlike industrial fan (think mamak stall extractor).
2. I think that applies to high speed >1000 rpm, when the metal bend/flex as turbulence from the air causes it to resonate.
3.
At the max rpm (200-ish rpm) noise should be silent enough, not terribly noisy. I think paper flying around will be the one making more noise

I think the lack of CFM rating for Rubine makes it hard for actual CFM comparison; but based on the manual, 85W AC motor is comparable to v touch junior (also 85W); this should have enough wind for the smaller rooms.
As an experiment can split half half to see which brand is more lasting
This post has been edited by ceo684: Oct 24 2019, 05:48 PM