Thanks Thanks:  0
Likes Likes:  0
Page 2 of 2 FirstFirst 12
Results 11 to 14 of 14

Thread: F4s flip Grimstad, Norway

  1. #11
    Burgess/Evinrude F1 V8 Lars Strom's Avatar
    Join Date
    Jan 2008
    Posts
    1,539
    Post Thanks / Like

    Default

    Well Ron..This is a sensitive issue..
    One driver was disqualified at the Stockholm GP this year for a modification of the skeg
    Not right if you read the homologation..but nosecone with low water pick up is legal.
    Not right if you read the homologation..but there is a UIM role saying the gear case is free for modification.

    I think they screwed up in Stockholm and the Polish driver should not have been disqualified..
    Attached Images Attached Images  
    Lars Strom

    Life is good





    Check my own racing history at BRF...http://www.boatracingfacts.com/forum...ead.php?t=6727

    My racing web site SVERA.se....http://svera.se/blogg/paris-6-hours/

  2. #12
    Burgess/Evinrude F1 V8 Lars Strom's Avatar
    Join Date
    Jan 2008
    Posts
    1,539
    Post Thanks / Like

    Default

    F-4s is running under the UIM Sport rules with Low Emission Engines that starts from 540, and role 543.05 clearly says that the casing of the underwater unit (gear case) is free....

    If the F-4s is not running under the sport rules, many more should have been disqualified, as most of the field had modified gear cases with nose cone and separate water pickup!
    and there is no rule what I have find, that says that nosecone and separate water pickup are allowed.
    Lars Strom

    Life is good





    Check my own racing history at BRF...http://www.boatracingfacts.com/forum...ead.php?t=6727

    My racing web site SVERA.se....http://svera.se/blogg/paris-6-hours/

  3. #13
    Team Member
    Join Date
    Oct 2007
    Posts
    15
    Post Thanks / Like

    Default

    Quote Originally Posted by FrenchPhil View Post
    The UIM speed record is currently 70.49mph. Rouen 24hrs winner's average was 41.25mph. So 50-60 mph sounds about right.
    You'd think with more power they'd be quicker than a 45....that'd be a interesting exhibition race

  4. #14
    Team Member Smokin' Joe's Avatar
    Join Date
    Mar 2007
    Location
    Texas and Tirol
    Posts
    657
    Post Thanks / Like

    Default

    75 mph NOT! Max. speed is 65-68 mph (about 110 k/h), they look like fishing boats running down the stretch.
    I tried to prop one for a beach start in Berlin last Aug., an impossibility due to the rev limiter (a hair over 6200 RPM).
    I certainly hope that APBA does not make the mistake of bringing that class to the U.S., the motor
    is a real dog. The good news is that SeaWay Marine in Seattle is casting new parts for the
    SST 45 motors. The bad news is that SST 60 prts are not being cast by anyone. That, and not F4S, is
    what we need.

    In order to understand that 75 mph is impossible in F4S, calculate using the .545 gear ratio and
    22" pitch, which is what's run. The speed is about the same in the old SD class but an SD
    boat would blow their doors off coming off the beach and out of the turns. The SD record was
    69+ mph. FYI, F4S runs at the same transom heights as SST 60, the gearcase bullet is nearly
    above the water line. They run 11"/22" pitch dia. instead of SE/SST60 12.5" dia. and much
    pitch at the leading edge.

    Finally, when tunnels run too near to each other they can blow over. I refer here to Herr Bernoulli.

    mccauleyandson.com

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. Dennie Paola, 70-R, Newberg Flip Photo-60's
    By arcticracer in forum Outboard Racing History
    Replies: 4
    Last Post: 10-30-2009, 04:03 PM

Bookmarks

Posting Permissions

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