According to the numbers and the taxi tests I did yesterday on grass, it is plenty of power. I only have a 9 x 6 and 9 x 7 (clipped 10 x 7) to test today. I know it will be enough to fly the airplane. I don't know how fast it will go. I know it pulls like crazy with both props. I am pulling 42 amps static with the 9 x 7 and 38 amps with the 9 x 6. The 9 x 6 turns up @ around 13,000 rpm. I haven't tached the 9 x 7.

The motor is a Turnigy SK Aerodrive XP 35-42-1000, Castle Phoenix 60, and Rhino 20C 4S1P 2350. I have ordered a Turnigy SK Aerodrive XP 35-48-1100. This motor will definitely be 100 mph plus and can sustain the 675 watts that is my target to compete with a TT40 424 airframe. The 35-42 will probably compare to a TTGP powered model. I have ordered a 9 x 7.5 & 9 x 9 APC "E" to test as well. I will fly today after work with an Eagle Tree Data logger to see what it does in the air.

The Viper 500 would also lend well to a EP conversion. You will run into the same issue I had with the Predator though with having to mount the motor on an extension mount to get it to balance. If this works, I want to build an extended nose version Q-500 to move the battery forward and make it so that the wing can stay on when taking the battery in & out. I would put the prop at the same 7.375" in front of the wing which is pretty standard with todays quicke 500 designs. The electric motors are much shorter and lighter, so a longer nose is a must.

I will post as soon as I get back from flying. I am hoping to get some video of it too. I wish I had a radar gun, but I will just have to judge off of past experience with 424 for speed.