Wanted to build a top mount 3in quad to see if it would make a difference in handling over bottom mount. Don't have enough flights to really tell, but it fly's well. I can say the frame is rubbish,if It makes it through a hard cash i'll be surprised. Still on the fence about the Rotorx 1404's, They do seem to be really efficient just don't have enough flights yet.
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I have the same motor/prop combo on a Tomoquads Predator X and I quite like how it flies. Definitely not a lot of power, but very quiet and suuuuper low amp draw. I actually get decent flight times (2:30 to 3:00) on a 450mAh 4S pack, which keeps the AUW nice and low. I'd still really like to see a 4000-4100Kv version of those motors, though.
I have the Rcx 1304's on 2 predx's running Dys 3045's and get much the same feeling and sound. That is why i'm probably still on the fence about Rotorx motors. I'm not a racer but get torn over floaty versus super sharp handling. The predx is a great frame and have 40-50 flights and crashes on each. In the next week I plan on putting on some Gemfan 2540's just to see how the handling changes. I do think a higher Kv would be nice but now i'm thinking that they were looking for a cruiser motor, almost like a low kv 6in?
Really curious about those motors. Also what props are those - I think your link is for the 5mm mounting version.
There's an X-mount version of the same prop: https://www.getfpv.com/rotorx-rx3044txsb-black-3xcw-3xccw.html
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hows the frame holdin up?