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Trim Tabs

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Question, I have a 16-48 100 gauge aluminum boat with a 40 hp on a jackplate. Trim tabs were placed on the rear at time of purchase. Dealer said that this was because the front end was too light for the motor. I now have trolling motor, battery and fishing equipment in the front, and Iím only averaging 29mph gps. Seems to me that with the new weight in front of the boat, the trim tabs are causing the front of the boat to dig a little. Would removing the trim tabs increase my speed now that I have the extra weight in the front of the boat that was not there at the time of installation? Spoke to the dealer on the phone and he recommended bending them upward. Will this cause damage to my boat, or would it be better just cutting them off? Any help on this matter would be greatly appreciated.
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Bend em........
I was thinking you should bend them as I was reading your post. Thats one smart dealer u got there. Whats the boat weigh? Got the right prop? Whats you rpm's when your goin 29 mph? Does it get better when you trim up the motor? Theres ALOT of variances to deal with before the tabs.
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trim tabs
I would not take them off, but bend them up. You may later on want a larger or smaller moter that you may need them again. Just take a hammer and tap them up they will not effect the peformange of your rig.
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Don't bend them!
If you bend them, you will crack the weld on your hull. If they are parallel with the bottom of the boat, leave them alone. Trim angle and elevation on the jackplate first, prop/rpms.
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Tabs
I have a very similar boat and my runs very good. Do not take tabs off as they are needed especially with jackplate to prevent porpoising and they will let you trim up a little more. Use a small piece of 2x4 and tap lightly from the bottom and bend up, a 2x4 bends more evenly than hammer, it wont dent or damage tab. Make a measuring stick with an old yard stick and measure from top of transom and mark current location with a sharpie. Bend up a little bit at a time and mark each location on stick, definitely not more than an eighth inch at a time. A small amount goes a long way. Bend up a little then run it and trim up until you feel hull break free from suction of water, as soon as this happens your rpm's and speed will significantly increase. In about fifteen to 20 minutes you should be able to get her right where you want her. Once she breaks suction and gets air under her she will fly, but can't fly without air. E-mail me if you need any more help as I've built several and tuned many.
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Re Tabs
If you decide you want alot more performance out of your hull, you could put some steps on it. This would greatly increase your ability to get up in shallower water, porpoise less, allow you to trim up more so you can get more performance out of your hull and not bounce as much in rough water. you're transom will sit much higher in the water and water will be much less likely to want to come over your transom when you come off plane. Your boat will be quite a bit more stable too. You will spend a few hundred dollars doing it if you don't have someone who can do a little aluminum fab if you can't do it yourself. I'll be glad to design them for you and tell you exactly what you need and you can cut them out, but I'm not interested in welding them so you will need to find a welder. If you're looking at keeping the boat for a while you would definitely enjoy the benefits.
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trim tabs
My uncle was a boat builder and he always said trim tabs were to fix a mistake. first thing i would look for is a bump on the bottom. get you a good long streight edge and put it on the bottom of your boat. if it rocks there is a bump if you see daylight you have a dip. the problem with aluminium boats is when they weld the ribs to the bottom they warp because of the heat. might not be much of a bump but can cause you big problems. a bump you jump a dip you dive. my aluminum boat gave me the same problem. My uncle was able to take the slight bump out with a sledge hammer and a block. Folks dont try this at home let a profesional aluminium worker do this. now as for as trim tabs they do slow you down and should not be needed on a small boat like that. speed ahh there you got something. everybody thinks there boat flies. gps will break your heart. you should get around 33 to 36 light boat with your set up. loaded down with 2 people i would not expect to much more than 30 to 33. 17 x 5 g3 with yamaha 40 light boat i get 34 loaded 2 people 32. let me know if your bottom has a small bump.
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Thanks
I used a small 2x4 and tapped lightly from the bottom forever and that dam thing didn't even move a little. Do I need to hit it harder or with a bigger hammer? I don't want to crack anything.
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trim tabs
was there a round in the bottom. I would bring it to an aluminum fabricator to be safe. you will see a little swelling where the stitch welds are. these will not give you problems but the slightest round will make you jump. we had to hit pretty hard on ours, but i am a sheetmetal worker on cars and do alumminum welding. its hard to say online without seeing the boat. but whats in the water while your running better be streight. but again if your uncomfortable with it let a sheetmetal worker or alum fabricator look at it. throw those trim tabs away. after update us on your results. good luck
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tabs
take 2 pairs of cresent wrenches put on the tabs and bend them up try out the boat see how it performs if its not performing right bend them back down tell u get it how u want it
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TAKE IT TO THE DEALER
If you need them bent up I would take it to the dealer and let them do it. If they screw it up they have to fix it, if you bend them and they break your out of luck. Good Luck!
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Why not cut off a half inch or so and not risk messing up the welds.
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