A set of 4 cnc-machined and anodized aluminum arms used on the QAV540G. These arms also fit on the QAV500. On the QAV500 they enable up to 12" props to gain efficiency and flight time. 11" or 12" props on these arms produce vibrations that are more difficult to eliminate in the camera video image. These arms can also be used on a QAV500 with the brushless gimbal upgrade.
Great replacement/upgrade arms review by Scooter619 on 5/9/2013
I put a set of these arms on my QAV500 and they've allowed me to increase my prop size up to 12" props. 10" or 11" props work seamlessly, but you'll have to modify your GoPro and FPV cam setup if you want to use 12" props. You'll want to center your GoPro in the GoPro holder section, then place your FPV cam either above or below the GoPro. This is another quality product from Tim and the folks at Get FPV!