prop question!
 

I just inherited a few nitro boats and i am not terribly familiar with them. all of them have the stock plastic props and i know from experience they will not last me too long, i was hoping that someone may be able to point me in the right direction. I was hoping to replace them with hopefully a graupner as i do not think i need the metal ones but here is what i have:
1: Megatech wicked angel with a .15 engine
2: Kyosho nitro viperGT with a .16 engine
3: a Kyosho jetstream 1000 with a .32 engine
Not real sure about the shaft size I am pretty sure both Kyoshos are 4 mm and the Megatech is 3/16. I have never balanced or sharpened a prop in my life, and i am sure i will try soon, but i would like to get a spare for each in the meantime so it looked like the graupner was a good deal. Thanks in advance guys!