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I have seen those EDF combo's where it includes the EDF fan and esc rated around 70-80 amps. Honestly the price is pretty good and likely would get you to your goal. My setup mentioned might be more suited for higher speeds... My largest concern about the cheap stuff is reliability. I have...

You would absolutely want LiPo and 5000mAh or 6000mAh. I'd look for 6s EDFs, the esc power rating would depend on the fan motor. The Arrma blx 185 esc is going to outperform most ESCs for the price point. It outputs 120-180 amps. (If the motor can demand that much) They run in the $50-70...

That setup looks pretty good to me, but not near your 40mph goal. It certainly gives you a good idea where to start. I think 90mm would be plenty of size if it was a higher end setup that what he used. You will have to start comparing thrust values and see where you can find the best bang for...

I think the angle of attack and placement are some of the most key factors. Is there a specific budget you want to stick with? I have not built one, but I have looked into EDF setups for an outrigger boat setup. My thought is that it would be a bummer if you spend lots of money and not have...