i need help

[customforlife]

I've try to research this.....I love building Rc stuff but I'm totally new to boats I got a bby 22" mono boat from a friend that I had to add hardware to, to get it running I ran it a few time and flipped it a few times but the prop shaft was not straight coming out of the boat well I too the shaft out of the hull and I'm replacing it with a new one along with correcting the off center issue but I don't know what the angle should be (up and down) of the shaft coming out of the boat

I hope this is the right place to post this and hope its not to confusing but I hope you experienced guys will help me