what prop

Don't take this the wrong way, but a

15p may put it on plane. I have a 17p Mirage on a 200 Merc that turns the proper RPM. IMO, no way will a 90 hp Yamaha turn a 17 let alone a 19. I know you will have more responses.
 
Go out on flat days and just tool around, cause I don't think you ever getting on plane with that set up!
 
Sorry to be the bearer of bad news, but you have too much boat for that engine, no matter what prop you have on it.

I had a V20 I/O with a 95hp engine.. on a good day with a tail wind and flat water I still couldn't get it up on plane, no matter what the trim of the boat. I came close a few times, but close doesn't make it. You need at least a 125 (IMHO).
 
Skools Out said:
you may need a 13p or maybe a 15p but more towards a 13 with that small a motor.
Click to expand...

X2 wit the 13P. Doel Fin, Trim Tabs and lighten her up as much as possible. I really like the 90 Yamaha but the boat would do better with two of them. My good friend had a 17' Chrysler Tri-hull with a 50 Johnson. It was a slug out of the hole and everywhere else but it worked. I hope the 90 will put it on plane. The hulls are efficient but I have the same doubts as Destroyer and MJ.
 
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