acanthurus Standard 50Hz. Despite the sales ad, this is certainly not a fast response ESC suitable for agile multicopters

acanthurus It WILL be ok to use the battery you propose, but with respect to the motor, it is impossible to say without additional info. Most motor data provide a table of max. current vs. propeller type at given voltages, so youc an select something there. However, since this is really a "no-thrills-and-few-safety-features" ESC, i would not exceed motor sizes of, say, some 50 grams. Also don´t take these 30A literally. In partially load, you will not be able to sustain 30A continuously. My personal limit is 24A at full static throttle, beyond that i´d chose a 40A ESC.

acanthurus No reverse function, no controllabe brake (just brake on-off configurable) - and most "Plane" ESCs have issues initial sync when they are asked to spin up a motor from stillstand (which is why sensored ESCs and motors are a lot more common in cars than in planes) You will be able to somehow drive the car, but it will not have smooth throttle response at all. Also the cooling concept is not really adequate. --> recommend to get something different.

acanthurus You will not have a stable voltage on the BEC line, so the receiver may not work, and the ESC will not start the motor because it detects undervoltage. --> forget 1S with this ESC.

acanthurus It will most likely work, just make sure you select the right pinion not to exceed the max current. The ESC does not support genuine (closed loop) RPM control but just (open loop) motor setting - so you need to program a pitch-motor-curve on your transmitter. This is "old school", but certainly works.

acanthurus It means that you can use the ESC on 4s, but you need to find your own supply voltage for the rest of your RC system (5 Volts normally) - e.g. from an external SBEC or UBEC. In practise, this means you must cut the RED line of the servo connector and only connect the remaining GND and signal lines to the receiver.The ESC´s internal BEC is a linear BEC which produces excess heat when used with high voltages - but the power stage of the ESC is able to handle 4S voltage for the motor lines.HOWEVER, if you´re running a 4S setup it means you are in a higher price and performance class and should seriously consider to use an ESC which is FULLY specified for 4S applications.

acanthurus You can use 1S lipo directly. There is a Ph1.25 plug provided, so it would directly fit into the old parkzone or e-flite 1s batteries. DON´T use 2s or more, or you will fry the thing immediately. On the antenna change, if you knw what you´re doing this is possible - but be aware that the transmitter is critical in terms of heat - losing on VSWR matching with your own antenna will maybe be not so healthy.

acanthurus In this case i don´t think this is for you. The resolution is analog TV only, and it is 120° wide angle - ideal for FPV flying, but too wide for most ground-based applications. For recording you need a receiver with integrated recorder (like Quanum Cyclops, or most Skyzone, Fatshark or Eachine goggles.For a body cam, you´ll be much better off with a higher quality action cam which has its own recodring funcitonj. This one here does NOT include recording functions in itself. Also the cam is not "faster", as it has the standard frame rates of PAL or NSC (depending on type), which is much lower than what you can get from a decent action cam.