Hi all,
Can't wait to use the 13x5.5 prop!!! 

Now the questions;
My 690 squ/in plane weighs 70oz fueled, uses 2500mah out of a 3300mah 4s battery and the motor is a Plettenburg 25-10 of 930k/v doing 5.45 secs/lap on 68.5' center to center lines and doing 9400rpm on the original thin epusher 13x4.5 prop.

What I would like to know is will this setup be ok using the new 13x5.5 epusher or am I better off going to the Plettenburg 25-12 that is 770mah and using a 5s battery.

My 4s setup is using 76% of full power.

If the 4s setup is going to run too hot and I have to go to 5s, what size battery do you think I should try? I was thinking about a 3000mah as I believe the 5s setup uses less Mah than a 4s setup, is this correct?

If I don't have to alter the rpm from the 4s setup, this will be 73% of full power.

Thanks Dennis, I'm hoping that will be the case.  (Fingers crossed!)

Thanks Tim, and less weight!!...Yay!   

Yeah, what I meant was that the weight won't go up (maybe slightly) because the battery can be lower in mah than the 4s.
I was worried the 5s would have to be about the same as the 4s in mah. But you showed me that was not the case.