David, you hit the nail on the head, weight is the issue getting adequate flight times. I have no issue hitting realistic .60 size speeds with the right prop selection, but the power consumption goes up fast.

The 5s motor is a Scorpion 4020-8 with a KV of 790. On the light weight Kaos, I used a 12x6 prop and was pulling only around 50A, but the Kaos is not really a ballistic design. Same motor in the P7, which is an ARF and a little heavy, I used an 11x8 prop. It was plenty fast, faster that my buddiy's P7 on a piped 60 (albeit with a fresh battery) but flight times were much reduced, pulling up to 80A.

The EU1 has surprised a lot of skeptics now, with it's performance. I don't know the real speed, but the calculated pitch speed is 130 mph. It's the Scorpion 4025-10 with a KV of 525. I'm using an 12x8 for the best compromise of speed/thrust. For all out speed, I have tried an 11x10, which has a pitch speed of 150. With the 12x8 I'm pulling 80A static.

i just converted an old SL1 to electric. This plane is not in the ballistic category, but I wanted to test out a Neu motor that I have. It's 515KV 3000W and I used 8s. I'll be flying it with a non e APC 11x13, which should scream. If this works out, I am planning on this motor in another EU1.