metalwizard
Chief Petty Officer
- Joined
- Sep 13, 2010
- Messages
- 411
AS some of you know I have been working on a 73 arrowglass viper. 17.5 foot tri hull
Rebuilt the drive replaced the 165 hp motor. etc etc
It runs pretty good. but I seem to be having some trim issues.
I DONT have a trim motor for it yet. (on order) but I can adjust it by hand..
When I take it out the bow seems to come up pretty high. I adjusted the front motor mount up as far as it would go and it got better BUT I still have to move people forward for it to ride the best..
Here are some thoughts... when I put the transom boot on, the intermediate housing seems kind of LOW in the transom hole. took me some effort to get the boot aligned up. Not MAJOR but its seemed to be an inch maybe even 2 inches low. didnt worry about it at the time.. BUT I got to thinking. (yeah I know that causes trouble every time)
If the rear motor mounts are shot, maybe even the stringers are a little low, making the back of the motor low. that means the prop is low in the water, could this be forcing the bow to come up?
Without super special tools is there a way to measure this and make sure it is correct?
I know I won't get true results until I get the trim motor in, but it was a thought, and in my head that makes sense.
Sort of on the same topic. where should the boat sit in the water at rest? How much in and how much out of the water? it seems to be close to level, maybe a little rear low.
Last thing on the same subject I did some searching but didn't find a great answer for my boat. what should my R's and speed be at WOT? I think I am close, but I know it is not 100% correct. I get to about 4000 rpm, and 30-35 mph (factory speedo) thinking about it now I really think it should be faster. I know there is a LOT that can effect that.. timing advance, dwell. carb, prop etc even hull condition... but I wonder if I am close to what I should be.
this is my first boat so sorry for all the typical questions, I figure a new thread is better than hijacking another one.
I do have this picture (not the greatest) of it in the water at rest last weekend. I will take pics of the transom boot and ream mounts when the sun comes up.
Rebuilt the drive replaced the 165 hp motor. etc etc
It runs pretty good. but I seem to be having some trim issues.
I DONT have a trim motor for it yet. (on order) but I can adjust it by hand..
When I take it out the bow seems to come up pretty high. I adjusted the front motor mount up as far as it would go and it got better BUT I still have to move people forward for it to ride the best..
Here are some thoughts... when I put the transom boot on, the intermediate housing seems kind of LOW in the transom hole. took me some effort to get the boot aligned up. Not MAJOR but its seemed to be an inch maybe even 2 inches low. didnt worry about it at the time.. BUT I got to thinking. (yeah I know that causes trouble every time)
If the rear motor mounts are shot, maybe even the stringers are a little low, making the back of the motor low. that means the prop is low in the water, could this be forcing the bow to come up?
Without super special tools is there a way to measure this and make sure it is correct?
I know I won't get true results until I get the trim motor in, but it was a thought, and in my head that makes sense.
Sort of on the same topic. where should the boat sit in the water at rest? How much in and how much out of the water? it seems to be close to level, maybe a little rear low.
Last thing on the same subject I did some searching but didn't find a great answer for my boat. what should my R's and speed be at WOT? I think I am close, but I know it is not 100% correct. I get to about 4000 rpm, and 30-35 mph (factory speedo) thinking about it now I really think it should be faster. I know there is a LOT that can effect that.. timing advance, dwell. carb, prop etc even hull condition... but I wonder if I am close to what I should be.
this is my first boat so sorry for all the typical questions, I figure a new thread is better than hijacking another one.
I do have this picture (not the greatest) of it in the water at rest last weekend. I will take pics of the transom boot and ream mounts when the sun comes up.
