RCU Forums - Kress RK-20 or RK-720???

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- - Kress RK-20 or RK-720??? (https://www.rcuniverse.com/forum/questions-answers-154/7867585-kress-rk-20-rk-720-a.html)

iflyg450

08-20-2008 06:24 PM

Kress RK-20 or RK-720???

What is the differance between the RK-20 and RK720 fans and which one would be the best for a OS 25VFDF?????

balsa4cat

08-21-2008 09:58 PM

RE: Kress RK-20 or RK-720???

Hi!
Your OS .25 vfdf would be appropiate in either Kress RK-20B or the RK-720. The major difference between these Kress units is the Fan diameter : RK-20B is 4" and the RK-720 is 3.5". Other differences is housing material and mounting in the housing/tube.
The potential for more thrust is in the RK-720 (more power to turn a smaller fan at a higher speed).

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