Re: Tahoe 220 not steering straight
I hope this does not come out as an insult.... since you state this is your first deck boat, I have to assume you are a beginner to this style or type of boat. Mostly, the trick is about learning and getting to know your boat.
Nice thought about the trim tabs, but those are only useful at higher speeds. There are a few things to consider with your slow speed (idle/no-wake):
1* Make sure you are trimmed all the way in/down.
2* over-correcting is quite typical; even with experienced boaters. You need to learn to make smaller adjustments and anticipate the next direction. Again, think small corrections; not getting you back on a direct line again, but started in that direction. It will become a feeling, rather than a reaction.
2* Increasing from a 3-blade to a 4-blade prop. These seem to hold a line better at slower speeds.
Again, just trying to help... practice, practice, practice. Enjoy your new deck boat!
