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Posted by carcynic | Sep 08, 2014 @ 09:47 PM | 2,578 Views
I was honored to be selected by EMAX to do a review and Flight Test of their New 2204 2300KV Motors.

I received my motors on 06 September 2014. What follows is not a full review, but I will update this with more posts in the future.

I mentioned to EMAX that the EMAX 2204's would be replacing the 2208 motors installed on my BlackFish 250 Quadcopter. For more information on the BlackFish, please see it's build thread, here:
http://www.rcgroups.com/forums/showthread.php?t=2172022

Before I installed them, I weighed one of each motor:

The Angel 2208 2600KV on a scale, showing 44.8g

Here's the EMAX Motor:

The EMAX 2204 2300KV on a scale, showing 26.5g

(Yes that is an old scale, but I prefer a true laboratory balance over a cheap digital spring scale.)

Note that I have to include the collet on the Angel's to make it fair. In both cases, I am showing everything needed to attach the prop.

So that is 18.3g less, per motor, or 73.2g less for 4 -- Almost a 15% weight reduction for the quad.

Weight, not advertised thrust, is really important for a small 250 size quad. I am never going to get near the peak of the efficiency curve for either motor when I am limited to 5" props, and smaller batteries. (More about the props later.) Weight savings, however -- on a small supposedly manoeuvrable racing quad -- is golden.

Next came installation:

The 2 motors have exactly the same mounting holes -- Size, orientation, and spacing, so mechanical...Continue Reading