Hello,
I would like to have your opinions about my boat's performance.
Attached are some pictures of my boat, which is around 12 ft long and around 4ft to 5ft wide, made in fiberglass. In terms of weight, I'll say it's around 200-250 lbs. I have it running with a 1975 25 hp Johnson 16-inch shaft (around 110 compression on both cylinders).
In terms of trim, the cavitation plate is pretty much flat to the bottom of the boat, so the trim is ideal ( based on what I've read).
The problem I'm having is that I cannot get more than 7 mph, even at full throttle. What happens is that as soon as I accelerate, the bow of the boat lifts up, which makes sense since the outboard weight and I are in the stern, but it does not compensate after the acceleration. I cannot make it plain.
I understand that I won't be flying with that 25, but I would think that I would at least double that speed (I'm saying this because I've used this outboard with three people around my weight, a 17 ft boat and a on-boat live well full of water and we were planing).
My assumption is that the boat is too short and there is not enough weight on the bow to balance the weight (I've tried sitting on the bow and my dad on the stern, but it does not improve at all, I'm around 220 lb, and my dad is about 130lb)
I've tried two different props (10° and 9° pitch), but I'm still not getting more than 7-9 mph. I've also tried with all the trim options on the outboard but does not get better.
I've been looking at hydrofoils, do you think they would solve or improve the performance? Or what would you recommend?
I was also thinking on extending the stern of the boat 3 to 4 ft ( make it a 16 ft boat )so it will be more balanced but this would be more expensive.
I would like to have your opinions about my boat's performance.
Attached are some pictures of my boat, which is around 12 ft long and around 4ft to 5ft wide, made in fiberglass. In terms of weight, I'll say it's around 200-250 lbs. I have it running with a 1975 25 hp Johnson 16-inch shaft (around 110 compression on both cylinders).
In terms of trim, the cavitation plate is pretty much flat to the bottom of the boat, so the trim is ideal ( based on what I've read).
The problem I'm having is that I cannot get more than 7 mph, even at full throttle. What happens is that as soon as I accelerate, the bow of the boat lifts up, which makes sense since the outboard weight and I are in the stern, but it does not compensate after the acceleration. I cannot make it plain.
I understand that I won't be flying with that 25, but I would think that I would at least double that speed (I'm saying this because I've used this outboard with three people around my weight, a 17 ft boat and a on-boat live well full of water and we were planing).
My assumption is that the boat is too short and there is not enough weight on the bow to balance the weight (I've tried sitting on the bow and my dad on the stern, but it does not improve at all, I'm around 220 lb, and my dad is about 130lb)
I've tried two different props (10° and 9° pitch), but I'm still not getting more than 7-9 mph. I've also tried with all the trim options on the outboard but does not get better.
I've been looking at hydrofoils, do you think they would solve or improve the performance? Or what would you recommend?
I was also thinking on extending the stern of the boat 3 to 4 ft ( make it a 16 ft boat )so it will be more balanced but this would be more expensive.
