Wierd WOT (Problem Solved)

[Bass Runner]

Most people have a problem with getting thier boat to run faster, I guess i have a ideal setup, mine is as follows, comes out of the hole like a rocket running a little over 50 with a 19 pitch prop but i try trimming up and it starts to porpous then i try to trim it down and it starts to bow stear, how can i stop this i know i am going to have to increase the pitch to get the rpm down below 6000 but what about the stability? would a hydrofoil help in the situation or not?

 

[Dhadley]

Re: Wierd WOT (Problem Solved)

I dont know about a hydrafoil but one of the larger fins have worked wonders on boats we've had do like yours. We dont use the small Sting Rays or Doel fins or anything like that. You should be prepared to run the motor much higher with a larger fin.<br /><br />Playing with setback to change the balance should help some too. Use the existing weight of the engine to help get the bow up rather than relying strictly on positive trim angle.

 

[Bass Runner]

Re: Wierd WOT (Problem Solved)

Originally posted by Dhadley:<br /> I dont know about a hydrafoil but one of the larger fins have worked wonders on boats we've had do like yours. We dont use the small Sting Rays or Doel fins or anything like that. You should be prepared to run the motor much higher with a larger fin.<br /><br />Playing with setback to change the balance should help some too. Use the existing weight of the engine to help get the bow up rather than relying strictly on positive trim angle.

Ok here's the deal, the cavitation plate on the motor is dead even with the bottom of the boat i'm afraid if i raise it there might be a cooling problem, at wot with the motor all the way down it bow steers and if i hit the trim up at all it starts bouncing all over the place, do you think i might just be exceeding the speed this hull is designed for? remember this is a 1959 model aluminum boat. although it is factory rated for 80hp . You can click the url at the bottom to see the hull on this boat. By the way the factory specs for this boat says it only weighs 530 lbs. dry weight. Thanks.

 

[KCLOST]

Re: Wierd WOT (Problem Solved)

Ok here's the deal, the cavitation plate on the motor is dead even with the bottom of the boat i'm afraid if i raise it there might be a cooling problem, at wot with the motor all the way down it bow steers and if i hit the trim up at all it starts bouncing all over the place, do you think i might just be exceeding the speed this hull is designed for?

This is a tough one, Unless you are refering to a "chinewalking" condition. Where you have a wiggle of the hull, compared to a porpoising..<br /><br />If it's chinewalking you need to raise the engine some (do you have a jack plate)?.. If its porpoising, moving the engine back with a jack plate will help. And also let you raise the engine even higher, thus gaining more speed..<br />But check you water pressure...

 

[Bass Runner]

Re: Wierd WOT (Problem Solved)

well it's not chinewalking the hull on the boat is stiff. it's a 1959 Texas Maid aluminum boat and is built really good and is tight, i don't have a jackplate, is it possible i might be exceeding the speed the hull on this old boat was designed for? or is it possible that the boat is to heavy in the back, it will jump up on plane almost as soon as you gas on it and accellerates really fast then it starts the bow stear a frind of mine had his boat beside me and said that the faster it went the lower the bow went, think tabs might be the answer, by the way how much would a jack plate cost and what kind would i look for i've never even messed with one.

 

[Chris1956]

Re: Wierd WOT (Problem Solved)

BassRunner, It is possible you are exceeding the max hull speed, although since you are under the max HP, I think it unlikely. I would check the bottom of the hull for a "Hook" in the hull that would push your bow down. I had a aluminum transom plate than hung slightly below my transom when I bought my speedboat. Drove the bow down with a vengance! I trimmed it so it was above the transom, and the speed increased from 45MPH to 55+MPH.<br /><br />Also some hulls are made to run flat in the water. Remember, Power T/T was not invented in 1959.

 

[Bass Runner]

Re: Wierd WOT (Problem Solved)

I have checked the hull real close and no hook in it, i don't think this boat has been used much in its life, its got original paint job on it and it only has a few scraches in it, at the transom the bottom dosnt have any dents from trailer bunks, it dosnt get crazy like a boat with a hook in it the bow just gets down so low the it tends to bow steer, it will trim up but when i do then it bounces just slaps the water and thats with two people in it maybe i just dont have enough weight in the nose but most of the weight is already at the front seat other than the 18 gal tank and its right behind the front seat, all thats in the back of the boat is a 6gal reserve tank and the battery.

 

[Chris1956]

Re: Wierd WOT (Problem Solved)

BassRunner, OK I'll go out on a limb! Is it possible that your outboard is bouncing up and down, causing the boat to bounce. The motor will do that if the trim system needs bleeding. Alternatively, is the transom flexing?

 

[Bass Runner]

Re: Wierd WOT (Problem Solved)

havent noticed the motor moving or the transom flexing this is a project boat and i have been keeping a eve on things like that, also acts as if it's under proped and it has a 13x19 on it now may have to go to a 21 to get the rpm down.

 

[sundog]

Re: Wierd WOT (Problem Solved)

Bass Runner~ I looked at buying a Texas Maid Tahiti 18', and a 16' fiesta (the 16' wasnt big enough for us, and then the 18' got taken off the market). nice boat. very light for its size, though. I think you might play with some weight in the bow, and dont trim all the way in. with a boat that light weight will be one of the biggest factors in how it rides day to day. If I remember its rated as a 4-6 person boat, so with 70hp WOT your probably running the boat very light.

 

[Bass Runner]

Re: Wierd WOT (Problem Solved)

Well I raised the motor a inch and am thinking about moving the 18gal tank to the nose but i hate to block the hatch because i am going to put a windshield on it (when i got it it didn't have one) It's a rocket right now just need to get it trimed out if i can ever get the motor running right. There is a guy that has 18' Tahiti in austin for sale for $550 with a 85 Johnson with a bad lower unit on it and a removable hard top.

 

[sundog]

Re: Wierd WOT (Problem Solved)

Really? do you know if this guy has any pics of the boat I can look at on the net? Id be interested in taking a look at it...if you have anymore info on it and you have the time, e-mail me at coralhead1@yahoo.com...if its in good condition Id sell mine and buy that (have a 1964 16' evinrude sport project boat...)<br /><br />thanks!

 

[sundog]

Re: Wierd WOT (Problem Solved)

the windshild shouldnt block the hatch if you can find or build one like the original...heres the pics. there are more on www.figerglassics.com<br /><br /> http://www.fiberglassics.com/texasmaid/texasmaidb61006.jpg

 

[Bass Runner]

Re: Wierd WOT (Problem Solved)

I wasn't talking about blocking the hatch with the windshield, i was talking about putting the 18 gal tank in the nose and it would block going through the hatch to get in the boat without climbing over the windshield.

 

[sundog]

Re: Wierd WOT (Problem Solved)

LOL! now I got ya. and buy the way, took another look at your pics...I wouldnt move the tank, anyway. youve positioned it about midships, so I dont think your going to gain a thing by moving it forward. <br /><br />and now Ive been thinking waaaaaay to much about that tahiti...could you forward a contact number to me? the wife will kill me, but thats the boat I wanted before I settled on this evinrude. <br /><br />thanks.

 

[Bass Runner]

Re: Wierd WOT (Problem Solved)

Ive sent you a e-mail and it came back but anyway i have misplaced his e-mail and address been trying to fine the boat on the other sites where it was listed and can't find it, guess i cover too many, if you find a post for texas maid on a clasified section, it is green and setting in a tractor shed, if I find it I will let you know.

 

[sundog]

Re: Wierd WOT (Problem Solved)

thanks, bass runner. Im in Dallas, so I can come look at it if I can find it. hows the boat coming?

 

[Bass Runner]

Re: Wierd WOT (Problem Solved)

Well tore the carbs apart again for the umteenth time and found nothing all the jet were clean and clear things kind of got me baffled, first it ran good, then it would take off and then loose power, then the (new) fuel pump when out, changed that and took it out and idles fine gas on it and it just dosn't have any power, runs about 8 or 10 mph at wot. Real head scratcher

 

[Bass Runner]

Re: Wierd WOT (Problem Solved)

Well i think i found my problem, no problem with the carbs but when i reinstalled them then i noticed the silencer didnt fit up quite right got to checking and took a flashlight and looked down behind it on the port side and when i pushed it up where it is supposed be it was pushing the fuel lines in toward the motor, guess what when it did it kinked the little short line coming from the center carb to the other two, pulled it off and shortened the line about a 1/2" and walla no kink, bet that has been my problem all along, going to take it out tomorrow and find out i'll let you know.

 

[sundog]

Re: Wierd WOT (Problem Solved)

LOL! nice job, bass...its the little things that can get you down...