In this thread, hoping for response from those that know..

here's what I know..or think I know..

I'm gonna talk about boats with car motors first..and what they do...

In a car the motor torques to the right, put more power and it will lift the left front wheel,.. now put that motor in the boat and it will cause the boat to list to the right.....right??...to combat that reaction...boat builders will use a right hand prop...the reason for this is to try to cancel out the motor torque with prop torque and make the boat run flat... the right hand prop will try to torque to the left and the motor torque to the right... that is why it's so important to have the right prop, more so with higher speed and HP...if the props is getting too much bite and over torqueing it will cause too much lift on the right side of the boat, all kinda weird stuff happens.. most deadly is bow steer.. and followed by barrel roll... so pretty much....you need to have a rigger that knows what to do to get a starting point.. then tune from there...most boats are right hand drive....but some are left... in some marine apps, they change the rotation of the motor... so it can get very confusing ..... that and some boats... like v drives, or velvet drives there are even more combo's... outboards have no motor torgue, only prop torque but..to keep it simple and easier to understand.. lets just talk about bravo type outdrives and normal merc power...whit all the norm... we come to the general fact... inboard boats with car motors,, most are right hand drive,, and spin right hand props