Dennis,
I have a 42-40 Turnigy and it has a little more power than a 35-36-1200, but not much. I bought it to see if it would be the same as a 35-42 I bought and it most certainly wasn't. It will run with a 12 x 6, but it labors. You will have to use shorter lines and I don't know how the SV-11 will like that. They look really happy on full 70's.
The 35 series motors are equivalent to the Axi 28 series motors. For example, a 35-48 is a 28-26 Axi. My 35-42 would be a 28-20, 35-36 would be a 28-14, and so on. Please see the attached photo of the motors. The one on the left is the 42-40-1050. The Rim-Fire 42-40-1000 would be basically the same animal. The other motors from right to left are: Rim-Fire 35-30-1250Kv (450 watts), Rim-Fire 35-36-1200Kv(650 watts), Turnigy 35-36-1100Kv(650 watts), Turnigy 35-42-1100Kv(850 watts), & the Turnigy 42-40-1050Kv(750 watts).
Based on testing, I don't feel that the 42-40 is enough horse to fly an SV-11. It would be a nice motor to fly no more than 630 squares @ 54 ounces. I would say the 42-50 would be a better choice or even a 42-60. Kv would depend on what prop you want to run. Have you considered using a 13 x 6.5? The 42-50 would benefit from that on either 4S or even 5S. Batteries are really not a problem as much as motor selection is. Have you checked out the new Turnigy SK series Aerodrive XP? I bought one of the 35-42-1100's and it is a brute with a 12 x 6. They also have a new Red & Blue series that have (3) bearings on motors larger than 28mm. The Kv's might be too low for 4S though. Price is really affordable.
Archie Adamisin
Muncie, Indiana