myhuntfish
Seaman Apprentice
- Joined
- Jun 5, 2011
- Messages
- 33
Re: Tohatsu Nissan TLDI 50 hp prop selection
you are right about the hopped 40's on the short boats, but there are alot of factors in play there. The boats are stripped. Some even cut out the seat to sit on the floor. Most of these guys have all the weight in the front and alot even have water tanks in front to add more weight and tune the balance. They also run very small diameter/high pitch chopper props that have no clutch/rubber. They have very low water pickups that allow them to jack the motor sky high and let the prop pierce the water surface. All of this with 60 plus horses to "power out" of the porpoising to boot. Thats fine if a person wants a fast aluminum boat, but I just want a good reliable fishing rig that does not porpoise and runs 40 or so. I think we will be fine with these boats. I just took a break from mine. I about ready to get back to it. If I could get mine to perform without the smart tabs and gain a few mph I would be happy. I think a 10.5 x 13 prop would get me where I want to be so I may have an inch of pitch added to mine. I may remove the smart tabs and have some larger tabs welded onto mine. I just need to figure out the design to stop the annoying water spray because the factory tabs seem a little narrow.
I'm using the stock aluminum prop that came with the motor which it says 11.1x14 I believe.
Good idea about the paint marker I never really thought about that, I'll try this tomorrow if it isn't to windy and hopefully will remember that dam gps. Really seemed like a difference in speed when I was able to trim it up and boy did it feel LOOSE and FAST but never know really till what that GPS reads. I just have a gps for a car but should tell me my mph still. I did notice less spray though from the trim tabs when I was able to trim it up a little.
Previous reply you said you have aluminum plate in the floor to make it level, you know you can add Marine plywood to your floor it is probably lighter and I tell you that stuff will last about 30 years or longer if you paint it. The transom on my 12ft my dad gave to me when I was 16 is made out of that stuff and it's probably about 16 years old or older now and been out in the weather all these years. That really is some dam good stuff and if you search it isn't priced to high. Here it is about 65-85 for a 4x8-1/2 inch sheet.
I'm gonna go out in my garage now and go level that motor off so I don't forget about it.
I must add though I did notice when take off maybe I got on it to much but that dam bow comes up kinda high then back down and takes off like a bulletfirst couple of times scared me but then it was down right FUN. Another thing I noticed at one point it was kinda hoping at WOT and by sliding my fat butt just a couple inches forward I was able to get it to level out. I must say I learned alot about this boat today and way less worrying or frustration compared to that dam skiff.
I started thinking about what you said about the boat needs to be long and it won't porpoise, I kinda thought the same but to be honest there are guys who have souped up 40's on 13-14ft aluminum flat bottom boats that don't porpoise at high speeds. I'm starting to think that maybe having this slight hook isn't a great thing either like I think steelepike said. I mean it's better then having the two rockers and a bad hook like I had with the skiff but I'm thinking on a flat bottom square nose boat when there built it is easier to probably build it and not get the hook that maybe the V's have. Maybe by building it as a V there's of course more welding distortion making the different parts forcing them together creating a hook maybe more. I don't know it's kinda theory I'm kinda having. I guess I'll let you know someday if this is true for when I attempt to build my own aluminum boat. This one will be built for redneck speed.
Chris
you are right about the hopped 40's on the short boats, but there are alot of factors in play there. The boats are stripped. Some even cut out the seat to sit on the floor. Most of these guys have all the weight in the front and alot even have water tanks in front to add more weight and tune the balance. They also run very small diameter/high pitch chopper props that have no clutch/rubber. They have very low water pickups that allow them to jack the motor sky high and let the prop pierce the water surface. All of this with 60 plus horses to "power out" of the porpoising to boot. Thats fine if a person wants a fast aluminum boat, but I just want a good reliable fishing rig that does not porpoise and runs 40 or so. I think we will be fine with these boats. I just took a break from mine. I about ready to get back to it. If I could get mine to perform without the smart tabs and gain a few mph I would be happy. I think a 10.5 x 13 prop would get me where I want to be so I may have an inch of pitch added to mine. I may remove the smart tabs and have some larger tabs welded onto mine. I just need to figure out the design to stop the annoying water spray because the factory tabs seem a little narrow.