Hi. I am trying to make an edf depron plane and i have some questions i would like to ask.

1) I noticed that motors are rated with KV which are known as rpm/V. So does it mean if i plug on an 11v polymer battery onto a motor rated at 5300Kv, it will run at 58300rpm with max power?

2) I was thinking of making the fan duct tube out of PVC pipe about 65mm outer diameter with 1 3mm wall. what do you think of this? it would be heavier than depron but its much stiffer and since the tube will only be about 300mm long, i guess it wont be that heavy

3) if i were to put 2 edf in a same tube, will it stack? for example, if i had 2 edfs with a 500g thrust rating each, will it add up to 1000g of thrust when placed in the same tube?

4) is there any mathematical formulas to calculate the thrust produced by an edf motor fan set?

hope some1 can help me ))