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  1. #1

    Default trimming your outdrive help.

    how do you trim your outdrive properly. I have always put the oudrive in the full down posistion and left it there. i am looking to get on plane a lot faster and keep plane at a lower speed so i can tow a rider on a tube without screaming around the lake and wasting fuel. when you get the trim set just right do you move it when you go to take off again. i was told by a family meamber to get on plane and bring the out drive up a little at a time untill your rpms start to drop. i do not know if this is true on not.

  2. #2
    Chief Petty Officer
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    Default Re: trimming your outdrive help.

    That's going to depend a little on your boat. I start trimmed full down/in and bump it up once on plane. Your RPMS should go up as you raise the drives. Depending on what I'm trying to deal with - flat calm, wakes, chop, etc., I usually trim until she starts to porpoise and then back off until she stops. For me, trim adjustment is frequent while under way unless I'm running in dead calm water which almost never occurs.
    DSiekman
    2000 Cobalt 293 Twin Volvo 5.0 Gi DP
    2001 F250 7.3 Powerstroke

  3. #3

    Default Re: trimming your outdrive help.

    the lake i go to has slight to moderate wake/ chop . i also just bought a doel fin to help.

  4. #4
    Supreme Mariner Silvertip's Avatar
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    Default Re: trimming your outdrive help.

    Quote Originally Posted by callyfisherman View Post
    the lake i go to has slight to moderate wake/ chop . i also just bought a doel fin to help.
    You're not sure how to trim properly but you buy a whale tail to help???????? The only way to learn how to trim properly is to PAY ATTENTION to what the boat is doing. You start trimmed down. Failure to do that causes the bow to rise very high during hole shot. As the boat comes on plane "bump" the trim in small increments. The seat of your pants will tell you when trim is proper. Trim too far up and you may experience porpoising or prop blow-out. Trimming for any other speed or condition requires experimentation. Every boat and every load is different.

  5. #5
    Chief Petty Officer
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    Default Re: trimming your outdrive help.

    Quote Originally Posted by callyfisherman View Post
    the lake i go to has slight to moderate wake/ chop . i also just bought a doel fin to help.
    Be careful with that doel fin. A buddy of mine added one to his older outboard. It worked "so well" that it allowed him to over rev the engine at which point the piston exited through the side of the cylinder. Whoops.
    DSiekman
    2000 Cobalt 293 Twin Volvo 5.0 Gi DP
    2001 F250 7.3 Powerstroke

  6. #6
    Commander
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    Default Re: trimming your outdrive help.

    Use your trim. that is why it is there.

  7. #7
    Petty Officer 1st Class
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    Default Re: trimming your outdrive help.

    Asking for advice without giving us some details on your boat is usually an exercise in futility. How can
    we give good advice unless we know something about boat length/type/weight, or engine size? Also,
    you'll find the various "fins" for the outdrives are not thought well of by a majority of posters (I'm judging
    by how many + and - replies I see to that topic), for anything but small fishing boats.

    In my opinion, if your boat is a typical 18-22 foot deep-V outdrive, SmartTabs would be a much better
    solution to your problem. You seem to not want to mess with the trim. Smarttabs would allow you to
    trim your drive out once (or at least not every time you go in gear), would still keep the bow down as
    you accelerate, and give added benefits, like less bow wandering at low speeds. They're basically "set
    and forget".
    Gene
    1988 Sea Ray 20' Seville BR, 205 hp V6
    1958 ChrisCraft 18' Holiday, 250 hp 350 chev
    1995 Klamath 14 Deluxe, 1982 Evinrude 15 hp

  8. #8
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    Default Re: trimming your outdrive help.

    Quote Originally Posted by dsiekman View Post
    That's going to depend a little on your boat. I start trimmed full down/in and bump it up once on plane. Your RPMS should go up as you raise the drives. Depending on what I'm trying to deal with - flat calm, wakes, chop, etc., I usually trim until she starts to porpoise and then back off until she stops. For me, trim adjustment is frequent while under way unless I'm running in dead calm water which almost never occurs.
    Same here. I start with the drives, and tabs down. Then, as the boat comes on plane, I adjust the drive trim up until the ride get's too uncomfortable, then back it down a little, then level out the boat with the tabs. As someone else said, you have to be mindful of RPM's, because they can sky rocket very quickly.

    Adjusting the drive trim in your case would be different then mine. I usually hop on plane and cruise for about two miles at a fairly constant speed, you pulling tuber's around would be constantly changing the drive trim.

  9. #9
    Fleet Admiral Texasmark's Avatar
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    Default Re: trimming your outdrive help.

    You need things to lift the stern if you want to reduce your planing speed. I know that there are bow lifting props that bass boats use and I currently have on my boat. I also understand that there are stern lifting props that would help a stern heavy boat lift it's stern. I'd say that and adjustable trim tabs would help you along with doing what you already do and that is tucking the trim all the way in when pulling the tubes. I never ran a whale tale. Didn't want to drill holes in my AV plate.

    HTH,
    Mark
    If you are new to boating or have a new boat, a knowledgeable friend could show you how to operate your boat and save you a lot of grief, maybe some money, and maybe your life.

  10. #10
    Rear Admiral Scott Danforth's Avatar
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    Default Re: trimming your outdrive help.

    what kind of boat?
    what kind of drive?
    what motor?

    learn to use the trim properly and return the tail.

    here is the method I used to trim the drives on my 3.0 liter boat when pulling skiers/tubes with only 2 people in the boat - drive full down, then WOT for the hole shot, as the bow is coming down, and the speed increasing, I am trimming the drive up and backing off on the throttle. I am also watching the GPS speed for tubing. generally the drive was about 1/4 way up on the gauge. Now here is the caveat. with 4 people in the boat, the motor needed a bit of help. I usually had everyone move to the front for the holeshot.

    on my 5.0 liter boat, I found that I had plenty of power for one or two tubes and could get lazy. once trimmed for optimal planing (again, about 1/4 up on the gauge), I would just leave it and use the throttle. now, for pulling two skiers, I would have to trim all the way down until the boat started to plane. trim tabs would be down just a bit, however not too much to cause too much drag.

    leaving your drive all the way down is snow plowing your bow.
    1988 Cruisers Rogue 2420 - VP AQ271C / 290DP "Rock'n Along"
    http://forums.iboats.com/cruisers-yachts/1988-rogue-2420-a-500145.html
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  11. #11

    Default Re: trimming your outdrive help.

    the boat is a 1969 seaflite with a mercruiser outdrive with a 3.0 inline 4 cyl i have about 2 to 3 adults and 2 kids in my boat at a time towing a one person tube with the two person tube cut the adults down to 2. i also keep an eye on the rpm so that wouldn't be a issue. far as the trim gauge go i don't have one on my boat.

  12. #12
    Rear Admiral Scott Danforth's Avatar
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    Default Re: trimming your outdrive help.

    if you dont have a trim gauge, then simply have it all the way down for the hole shot, and as the boat comes on plane, start raising the drive just a bit and back off on the throttle. if you raise it too high, the boat will start to porpoise
    1988 Cruisers Rogue 2420 - VP AQ271C / 290DP "Rock'n Along"
    http://forums.iboats.com/showthread.php?t=500145
    1970 Wooster Hellion 7' of cool mini boat with a Merc 9.8
    Recent Boats
    2002 SeaRay 190BR - MC 5.0 / Alpha I series II "Cheasheads in Paradise"
    1984 Avanti 170DLI - OMC 3.0 / OMC Stringer 400 "Ship Happens"

    The problems we face today can not be addressed at the same level of intelligence we were at when we created them - Albert Einstein Or with the same level of $ - Me

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