Motor and ESC pairing

[deananderson8]

Hi Gang, new here have several large scale gas models (Mack Products JS Skiff 26cc gas, a 1935 Gar Wood Speedster 1/6th gas power 22cc and a VBox that my father was never able to complete) and I am relatively new to Electric RC with the exception of several boat Kits that i have inherited from my father (1935 Gar Wood Speedster 1/12th electric and a Joysway Surge Crusher I bought RTR). I'm sort of making the switch as many of the places near me that you can run RC Boats do not allow gas motors or are too small to run them like I'd want to. I am currently building an offshore cat with a dual motor setup. The hull is a Silver Fox 930mm cat twin screw setup with stinger drives. I have from my fathers collection of boxes and stuff bought (obviously without mom knowing lol) 2 540/4y 3650 2050kv 900w 24V max 38Ampmax 50000 rpmmax
and 2 550/5t 3655 2600kv 1200w 19Vmax 63Ampmax 50000rpmmax Rocket brushless motors.
Which motor would be better suited for the twin setup? and stay 4s or move to 6s?

[deananderson8]

So increasing prop size increases amp load on the motor? How do I figure load as I increase pitch and size (diameter), and which way should I go so that I can play with the prop setup and not fry my motor or ESC? Decrease kv and increase voltage while decreasing amps or the opposite increase kv and decrease voltage while increasing amp? What way is the best way to go and is it safe to say with a 50000 rpm rated motor I should keep it between 24000 to 37000 rpm's?

[deananderson8]

I have a 540/4Y motor. I am guessing the 4Y is the winding and with more winding I gain more torque? I was going to run a 100 amp ESC. I also have a 550/5T, again I am guessing that 5T is the winding? I still don't understand the difference between Y and T in the description. Winding style or winding gauge amount of winding? Criminy the learning curve on brushless is steep . . . .

[tlandauer]

Welcome, may I respectfully make a suggestion?
You seem to have read a lot and your questions are very specific, but you have either answered your own question and/or answered your question with another question.
If you have a burning question, organize it and put it out just as a question, i for one would like to answer but the length overwhelms me and I am about to board a plane, so I could not read all of this.
Please dont mind my suggestion, I respect you and just want to see some of your questions get answered by experienced people here.