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I have been trying to get a little more performance out of my jon boat. It has a 1981 Evinrude 35hp and the boat is a heavy 16ft 1972 polarcraft. I added a big casting deck out of plywood, bow trolling motor, storage compartments up front for tackle. the Troller is 24v system and i don't have...

Interesting comments. When i had the motor raised up as high as i could (cav plate about 1.5" above the bottom of the hull) i could only turn about 5200 rpm and i lost a little speed (24.5 mph), hole shot seemed not as good but i wasn't blowing out from what i could tell. I lowered it to about...

I think the best you can do with a 12v system is 55lb thrust, i don't know how big your boat is but if it's over 14 ft i would recommend a 24v system. I fish the Missississippi River and i have a 70lb on my 16 ft flat and it by no means is over sized. Wish i had an 80lb. if you were really...

I have tried it 1.5" above the bottom of the hull and I loose speed. I lowered it to about 0.75" above the hull and i'm getting about the same speed i got with out the trim kit, which is about 25 to 26mph with a 10.5x11 aluminum solas prop. I have a lot of weight in the front of my boat due to...

I think you may be right.

So i purchased and installed a CMC PT-35 on my 1972 Polarcraft jon boat. The motor is a 1981 Evinrude 35HP model # E35RC1G and I am struggling a bit with the engine height. The manual on the PT-35 says to mount motor with the cavitation plate 1" to 3" above the bottom of the hull. I mounted...

Thanks guys, I will give it a shot, seems like it will work well.

I suppose i could use 1/2 inch thick poly board or something like that vs marine plywood

So i picked up a CMC pt35 for my 16ft jon boat, i have a 1981 35HP evinrude to go with it. I was eyeing up the fit last night and the first thing i notice is that i have a bunch of small bolts that go through my transom to 3 gussets in that brace from the transom to the bottom of the hull...

Someone asked for pics of my beat up prop, i chewed two of the blades up on a little gravel this spring at some point. I also attached two pics of the front deck build

Interesting....I ordered an aluminum 11x9" solas aluminum prop just try try it out. I think my speed is going go way down but i want to see what my rpm does. I will post back with my results.

Why experience tells you that? I have always heard 200 rpm per inch of pitch. In my experience with larger props (14x26) that the rule generally holds true, with some variation on cup and prop design.

https://www.amazon.com/Hardline-Products-HR-8061-2-Tachometer-2-Cylinder/dp/B000FOOAXY/ref=sr_1_2?ie=UTF8&qid=1498575856&sr=8-2&keywords=hardline+products+tachometer

I will try to get a pic of it tonight. I hate buying props without trying them, but i might order a 11x9 solas and see what that does. I'm pretty confident my rpm measurement is correct, but just to confirm, i got one of those induction tachs where you wrap it around the spark plug wire...

Also, can you recommend a prop for my setup then? Was looking at the solas 11x9. I think i need a significant drop in pitch to get my rpm where it needs to be

i was a little concerned about that. Can you tell me why it is hard on the motor? Why operating at that point kills motors?

Haha good question, 2 part answer: 1) I fish the upper mississippi river and it's giant, a few more mph won't make much of a difference getting from point A to point B but it my mind it does :D 2) I just feel like 4500 rpm just isn't getting to the peak point in the HP curve for my motor, so...

Hey guys, just joined the site, love the fact that its all about tin boats. First off i'm going to pre-apologize about the length of this post. Quick background on myself, bass fisherman from La Crosse WI, have always owned a bass boat for tournaments and a tin boat for fun fishing in the...