Click for Abeking Click for Cheoy Lee Click for Burger Click for Ocean Alexander Click for ZF

Riva-Bertram BahiaMar 20 - Trouble

Discussion in 'Riva Yacht' started by Ioannis76, May 30, 2011.

  1. Ioannis76

    Ioannis76 New Member

    Joined:
    Sep 20, 2010
    Messages:
    7
    Location:
    Athens, Greece
    Riva-Bertram BahiaMar 20 (Hull 76 - Built 1971/2) has come to my possession, and I am in the process of restoring her little by little.

    I seem to have hit a dead-end however as I have found a quite serious hull defect. The builder of the boat (RIVA) unlike Bertram has not installed any frames between the longitudinal stringers and the side of the boat, leaving a long and wide unsupported panel of the hull. As a result, this area (i have found to my horror) is flexible even by pushing against it by hand (see photo).

    I am in the process of removing the old anti-fouling (finding vertical cracks on the spray-rails in that area of course) which suggests that things are even worse than they look.

    Local boatyards claim they can fix this by removing the boats deck (to get to the void area in question which is not accessible otherwise) repair the fiberglass from inside (by laying new material) and installing additional stiffeners (transverse frames or longitudinal stringers) and then re-doing the gelcoat from the outside.

    Any thoughts? Is this a no-go or can it indeed be rectified?

    Thanks in advance,

    Attached Files:

    Last edited: May 30, 2011
  2. K1W1

    K1W1 Senior Member

    Joined:
    Sep 30, 2005
    Messages:
    7,393
    Location:
    My Office
    Hi,

    Not sure about the best way to overcome your problems with the boat but do know how to make your photo fit within the approved sizes, 640 x 480 it is currently 3 times wider and twice as tall.
  3. Ioannis76

    Ioannis76 New Member

    Joined:
    Sep 20, 2010
    Messages:
    7
    Location:
    Athens, Greece
    sorry - no photo preview when pre-viewing the post... fixed
  4. RER

    RER Senior Member

    Joined:
    Jan 20, 2009
    Messages:
    1,194
    Location:
    Newport Beach CA
    That is a very, very, good looking boat! How did the "defective" hull make it through the past forty years?

    But seriously they probably ran the **** out of it and you now have de-lamination... soft spots on the bottom... which can be repaired by grinding away the damaged fiberglass and laying-up new material in its place. Yes, access can be tricky, but it's nothing money can't fix.
  5. SeaEric

    SeaEric YF Historian

    Joined:
    Jan 28, 2007
    Messages:
    1,305
    Location:
    Easton, Md./Ft. Lauderdale
    Those are pretty tough little hulls. That boat was (over)built back when they still didn't know how light they could build them. I'd get an un-biased surveyor to take a close look and render an opinion before spending lots of money on repairs.
  6. Ioannis76

    Ioannis76 New Member

    Joined:
    Sep 20, 2010
    Messages:
    7
    Location:
    Athens, Greece
    Moving along

    Thank you RER and SeaEric, I have followed your advice and had the boat checked by professionals - she'll make it fine! Restoration will be starting soon and a new engine is being considered. I am looking at the 4.3 MPI Merc (220HP) which I think is a reasonable power for her (original engine was a Crusader V8 - 210 HP). Any thoughts on that?

    Thanks again
  7. Capt J

    Capt J Senior Member

    Joined:
    Jul 11, 2005
    Messages:
    11,432
    Location:
    Fort Lauderdale
    I think you're better with a chevy vortec 5.7, they are bulletproof and push the boat better with the deep v and you'll run the engine easier......it's better to have too much power rather than not enough.....
  8. AMG

    AMG YF Moderator

    Joined:
    Jul 26, 2004
    Messages:
    5,204
    Location:
    Sweden
    Many of the smaller Bertrams with new and smaller engines, use to float too high because of the deep vee, so i would go for a V8 for both the weight and the power. But 5.0 would be enough.
  9. K1W1

    K1W1 Senior Member

    Joined:
    Sep 30, 2005
    Messages:
    7,393
    Location:
    My Office
    Hi,

    As the Service Manager where I did my apprenticeship used to say when he saw mine and a colleagues attempts at a turbo charged 2litre MK 2 Ford Escort hillclimb car -- There ain't no substitute for cubic inches - In his case he was on about sheer power, in this case it is power and weight - not something that is usually sought for its mass over displacement these days.
  10. 1ayacht

    1ayacht New Member

    Joined:
    Dec 26, 2008
    Messages:
    6
    Location:
    Annapolis
    I have a 1965 20' Moppie. I put a merc 4.3 in and it is the perfect match for the boat. Maybe too much power!
  11. Ioannis76

    Ioannis76 New Member

    Joined:
    Sep 20, 2010
    Messages:
    7
    Location:
    Athens, Greece
    Problems solved, boat restored!

    ...coming back to an old post from the past, thanks to good advice (from these fora) and professional assistance, my little Riva Bertram Bahiamar 20 (Hull No76) now affectionatelly re-named "Elsie" has been fully restored, and fitted with a brand new Merc 4.3 MPI and AlphaOne sterndrive. Lots of work on the hull and fittings, electrical installations etc, but the boat is now in as-good-as-new condition! No effort spared to salvage all the original fittings and equipment to keep the original look! Some photos to go arround! enjoy!

    Attached Files:

  12. PacBlue

    PacBlue Senior Member

    Joined:
    Jan 9, 2009
    Messages:
    1,584
    Location:
    Dana Point, Ca
    Beautiful work - what is the new cruise and top speed?
  13. Ioannis76

    Ioannis76 New Member

    Joined:
    Sep 20, 2010
    Messages:
    7
    Location:
    Athens, Greece
    Thank you pacblue, the cruising speed is 25 knots and top speed is 37 knots, which are both as per original builder's specs. I have found however that the most comfortable speed for her in the specific area where i run her is around 20-22 knots on around 2500 rpm
  14. PacBlue

    PacBlue Senior Member

    Joined:
    Jan 9, 2009
    Messages:
    1,584
    Location:
    Dana Point, Ca
    I have found that for vessels under 50', the 20 - 22 knot range is ideal, it passes the non-technical "comfortable underway" test, and does not require the white-knuckle steering wheel grip at the over 35 knots speeds.

    I believe this has more to do with wave periods and frequency of encounters with the waves at this speed - it just seems to feel right and does not require a lot of acrobatics to move around the boat underway.
  15. kalimera11

    kalimera11 New Member

    Joined:
    Feb 27, 2013
    Messages:
    2
    Location:
    mediteranean
    Great boat

    Hello Ioanis

    Can you please let me know what exactly were the problems with the hull.
    I plan to buy the same boat.
    Or do you sell by any chance your beauty?

    Kalimera11
  16. kkreicker1

    kkreicker1 Senior Member

    Joined:
    Nov 4, 2011
    Messages:
    133
    Location:
    Naples, FL or Saugatuck, MI
    I love the lines of this boat! I would love to see her behind one of my homes.
  17. Ioannis76

    Ioannis76 New Member

    Joined:
    Sep 20, 2010
    Messages:
    7
    Location:
    Athens, Greece
    Hello Kalimera 11

    The problems with the hull were basically the skin being quite thin (there was no delamination) and the boat not having any transverse framing - as designed. In addition, the longitudinal stringers and transom had rotted somewhat. So the hull skin was reinforced and framed, the stringers were replaced and the transom was rebuilt. That is as far as the hull is concerned because the boat received a full restoration to original condition (including seats and trimmings), new engine, new gas tank, new bilge pumps, re-chroming of various parts, modification of the instruments to run with the new engine, new seats and footrests in original riva style and much more.

    I would be very carefull if I were you on inspecting a boat this old (are you looking at the original B20 or the Riva-made B20 like mine? - I would be interested to know)

    I am not selling mine at this time, although the outlook for boatowning in Greece at the moment is quite bleak... I will try to hold on to her for as long as possible, as I have only run her for one summer season yet.

    Good luck with your project!

    Ioannis
  18. kalimera11

    kalimera11 New Member

    Joined:
    Feb 27, 2013
    Messages:
    2
    Location:
    mediteranean
    Hello Ioannis

    Thank you very much for your detailed answer.
    I will look at a boat next thuesday, it was built in 1975 and according to the owner mostly stored out of the water. Only in sweet water. The current owner did not use it for 4 years. But he built in a steyr diesel engine M236. This was 7 years back. The engine has only about 60 hours. What do you think the boat should cost?
    Could you send me an e-mail with pictures were I would need to inspect?
    Please let me know if you plan to sell yours.

    Best regards

    Kalimera11

Share This Page