Which Way to Install Trim Tabs, Angled or Straight?
#22
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Join Date: Dec 2003
Location: Cleveland, OH / Pewaukee, WI
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Also remember that if you put them parallel with the water and on the outsides of the transom they will be much higher out of the water when running at full speed. If you need tab at that speed you will need the longer tabs just to touch the water with them. From the keel of your bottom to the new location is a big difference in height. I measured I would need aprox 6" longer on my tab to do the same thing. In a nut shell don't even try it with short tabs IMO. Also if you need full tabs to get on plane this also could be a problem.
What do you think about Spyder's set up? Thats how I was thinking of mounting them......
#24
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From the people that I have had help me set my boat up and i might add they have many world championships under their belts so I sure they know what they're doing, parallel with the water because when running at full speed and on the outsides of the transom they will be much higher out of the water as typhoon said. and the water is not coming off the boat at an angle so you don't want your tabs pushing at an angle (side to side) slowing you down. The red line shows where the boat rides and that's how the water exits the bottom of the boat when running so that how the tab needs to sit. but you have to run longer tabs as well.
#25
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I plan on installing mine horizontal to the water and in on the lifting strake.
I'm using 280's on a 24-7 pantera.
Parallel to the hull and you may as well be throwing a parachute off the back when you actuate them downward.
I'm using 280's on a 24-7 pantera.
Parallel to the hull and you may as well be throwing a parachute off the back when you actuate them downward.
#26
Geronimo36
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Depends on the throttleman. Jason does it totally differently..the way Bobby Sheer and Keith Hazell taught him...and it seems to work OK
Neutral drive (or even a touch positive or negative) plants the ass of the boat, dropping some tab plants the bow. Nice level flight without any of the transom hop caused by tucking the drive in too much.
Neutral drive (or even a touch positive or negative) plants the ass of the boat, dropping some tab plants the bow. Nice level flight without any of the transom hop caused by tucking the drive in too much.
Last edited by Panther; 10-30-2013 at 07:20 AM.
#27
Geronimo36
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I have a set of k-planes collecting dust in the shop. I am planning to install them on my 21' Scout. I cant decide whether to install them parallel to the V or place them horizontal like some of the newer race boats. What's your thoughts? I'll start popping some corn.....
#28
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In my situation, if I need tabs at higher speeds it is to keep the boat running flat in rough water while still using neutral or positive trim. Negative trim does not have the same effect and can get you in trouble. If I am running in water rough enough to require tabs then I will not be running flat out so a little drag does not matter. This is how my little Donzi 22 came from the factory and it works great. I do not need anything bigger.
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Joe (12-18-2021)
#29
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I cant see for sure from the pic but I bet it has an extension box other wise you most likely couldn't turn the drive with out hitting the tabs. You might run the risk of the tab hitting the water being that low in the transom. I also like the idea of them being further apart with the concept of them also working like training wheels if you are chine walking from side to side. These are just my opinions and Im sure there different than many others.
#30
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We boat in the south of England in fairly rough waters, prevailing wind is normally south westerly which means i usually have to run with one tab partially down to make the boat run level and i have found that if the tabs are parallel with the V as you extend the starboard tab it creates so much drag you have to steer to port to maintain your course, also the speed drops of dramatically. With them set parallel to the water they don't cause anywhere near as much drag or unwanted steering, i have also found the longer the tab the better as you don't need as much angle on a long tab.The tabs in the pictures are carbon fibre and are 8" longer than mec 380's with a slight upturn on the end to reduce drag they will have a carbon fibre reinforcement bonded to the top and the cylinders will operate almost vertically so the leverage isn't trying to pull them of the transom.
Peter
Peter
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ICDEDPPL (12-17-2021)