My second speed record attempt quadcopter. Hit a peak speed of 231MPH. Back to the drawing board!
https://streamable.com/0htlyk
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What is the dry weight of the setup? What is the weight of the frame?
how are you selecting the motors and props?..prop pitch? kv etc?. i assume you are applying pylon racing type principles?..i.e. high rpm, low diameter, high pitch, low drag?..and checking reynolds numbers for blade tip speed?
Prop choice is the same as the current record holder. Although I am using a static thrust calculator to estimate. https://rcplanes.online/calc_thrust.htm
In order to go faster than 260MPH the 5.2x6 APC would need more pitch because the tip speed is right around .92 mach
I've thought about this quite a bit - it's worth it to get the f80s with a slightly larger lipo. I don't think the 234mph run by quadmovr had this level of aerodynamics - you'll easily be able to get the world record with that setup. Maybe slightly more pitchy propellors? How many amps did you pull on the run?
Yes you are absolutley right about the lipo, the main reason I chose this one was because of it's small size. I knew the 1300 would be a better choice but it just had to be quite a bit larger to make it better in the looks department. I sort of just hoped the battery would live up to the claimed burst c-rating but I knew it probably wouldn't. Another issue is the long power wires this configuration has, further reducing the voltage. The max amps it did was 145a total, only for around half a second. I'm really happy with the speed considering how it's pretty sapped for power, but obviously was hoping the battery would be a little closer to the 190c burst rating. The props still have more speed left in them, the current record holder is using the same.
work backwards from your speed objective. determine the rpm and pitch first. (obviously you'll need to counter for drag). if the wires are large enough v sag due to length shouldnt be an issue. battery c ratings are rubbish really. yes they might hit them but the chemistry is never the same again. toast.
im interested to know the drag trade off and where the sweet spot is in terms of size. i assume its CSA related so you could get away with a relatively high powered drone by making it tall/long?
This is awesome and the first time I've seen anything like it! Is it fun to cruise around with it some at "low speeds" of like 100mph? You
Why you not use f80 motors?
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damn it.. i didn't realize others were onto this design. Good luck my friend.