Some of the responses, are biased. Not obvious. rfodor...the CS 10 blade runs well on the 42 with 4 cell. A wemotec mini uses 1200 watts from this combo, the CS 1800. Thrust from the wemo is 3.8 pounds. Thrust from the CS is 5.1 pounds.

The CS multiblade fans are designed for more power. Need more. Get more. Hard to balance.

Extreme...Alot of the response is due to the way you want to sell what you stock, and since you don't stock Velocity inrunners, you bad-mouth them, in fact anything outside of your sales envelope gets a biased review. I'd check that.

Check yourself, because a forum is an exchange of ideas and information. Not a sales pitch