Page 1 of 2 1 2 LastLast
Results 1 to 15 of 22

Thread: outboard set-back

  1. #1
    Join Date
    Jul 2007
    Posts
    322
    Rep Power
    0

    outboard set-back

    have a 16 DONZI O/B, motor is a 200 Mariner 20", thinking of installing a jack plate. Anyone recommend a set-back ? Most likely go with a manual. "HIGH LIFE"

  2. #2
    Join Date
    Nov 2001
    Posts
    870
    Rep Power
    23
    I can't recomend this because I didn't run it yet, but its 8" back and 5" up. It's there because it's in proportion to good setups on other 24 degree hulls I've seen. A 21' superboat, 16' superboat and a 16' donzi outboard that was in closer and not as high.
    Attached Images Attached Images
    Maddy's Daddy
    L.I.,N.Y.

  3. #3
    mrfixxall Guest

    fixx

    just remember the further you go back the stronger the transm needs to be..

  4. #4
    Join Date
    Sep 2005
    Posts
    5,802
    Rep Power
    0
    HIGH LIFE, what lower unit do you have on the 200?

  5. #5
    Join Date
    Nov 2001
    Posts
    870
    Rep Power
    23
    Quote Originally Posted by mrfixxall View Post
    just remember the further you go back the stronger the transm needs to be..
    This boat has stainless rods from the transom to the stringers.
    Maddy's Daddy
    L.I.,N.Y.

  6. #6
    Join Date
    May 2004
    Posts
    540
    Rep Power
    20
    Quote Originally Posted by maddad View Post
    This boat has stainless rods from the transom to the stringers.
    I did the same thing, or similar, to this on my 18' Youngblood. I used stainless turn buckles so I would always be able to snug the tension if needed. This is an excellent reinforcement to the transom.

  7. #7
    Join Date
    Jul 2001
    Posts
    14,603
    Rep Power
    38
    May find some interesting points here!

    http://forums.screamandfly.com/forum...d.php?t=158536
    No matter what your beliefs are "GOD BLESS AMERICA"

    Fully retired marine tech near 60 years in the biz.

  8. #8
    Join Date
    Sep 2005
    Posts
    5,802
    Rep Power
    0
    Throw a set of these in and you can use as much setback as you care to experiment with .........

  9. #9
    Join Date
    Mar 2002
    Posts
    1,643
    Rep Power
    24
    My jackplate is not a set back.I have the transom reinforced but getting a stress crack.I was told by a fiberglass shop that this is minor and just the stress from flexing.The way they put in the new transom.Glassed in the top deck doesnt allow it to flex correctly.

  10. #10
    Join Date
    Mar 2004
    Posts
    222
    Rep Power
    21
    Quote Originally Posted by fasttrucker View Post
    My jackplate is not a set back.I have the transom reinforced but getting a stress crack.I was told by a fiberglass shop that this is minor and just the stress from flexing.The way they put in the new transom.Glassed in the top deck doesnt allow it to flex correctly.
    not sure I buy that, if mine was doing that, they would be fixing it, and i would be doing knees, or rods as above before running it again.

  11. #11
    Join Date
    Feb 2006
    Posts
    46
    Rep Power
    0
    Something is really moving to see gel coat pop off like that. Needs to be stiffer.....

  12. #12
    Join Date
    Jul 2001
    Posts
    14,603
    Rep Power
    38
    Quote Originally Posted by fasttrucker View Post
    My jackplate is not a set back.I have the transom reinforced but getting a stress crack.I was told by a fiberglass shop that this is minor and just the stress from flexing.The way they put in the new transom.Glassed in the top deck doesnt allow it to flex correctly.
    I have seen this type of damage before, and have redone others work! The reinforcing plate is transferring the stress outward, without the plate the transom its self would flex and start cracking at the top all the way across. The only cure is rods with outer backer plates or very substantial knees, knees do not need to be big wide chunks, some of the strongest knees are built over 1/4" plywood ending up 3/4" thick. Most of the force exerted on the knees is PULL, the plywood is nothing more the something to glass to and hold the glass shape while it cures. The most important aspect is the anchoring to the hull and transom, the layup on the transom must be quite a bit larger area wise then many realize, IMO the best layup continues from one knee attachment point across to the other so the engine mounting bolts through it and at a minimum thickness of 1/4". There are a lot of slock shops, how many will do it where you will go through many season with no visible signs of cracking. Rods are the easy way!
    No matter what your beliefs are "GOD BLESS AMERICA"

    Fully retired marine tech near 60 years in the biz.

  13. #13
    Join Date
    Mar 2002
    Posts
    1,643
    Rep Power
    24
    Quote Originally Posted by rchevelle71 View Post
    not sure I buy that, if mine was doing that, they would be fixing it, and i would be doing knees, or rods as above before running it again.
    Yes,this donzi needs work.It would make for a nice and fun project for someone here on this site.Iam too bizzy working over 70 hours a week.Iam asking here and now for anyone reading this post to consider taking this off my hands.Go for it!This 200hp johnson rocks and is completely restored.The trailer is completely rebilt everything new.I got 62.5 gps and it has more in it with the right pitch prop.Ive been asking $6500.Ive got $8800 in it.Will consider all offers......

  14. #14
    Join Date
    Sep 2005
    Posts
    5,802
    Rep Power
    0
    Run the knees right up to the lip .........nothing stronger

  15. #15
    Join Date
    Jul 2007
    Posts
    322
    Rep Power
    0
    Greg G , After looking at your pictures, do the knees extend thru the deck area to the stringers ? Before installing my motor I made up a 1/4" SS plate that goes down the inside 4" over the top 2" and down 16" plus 16" wide. P.S. if the knees go to the stringers how do you take the deck off ? "HIGH LIFE"

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •