Results 1 to 9 of 9

Thread: May be useful for setting up a rigger.

  1. #1
    Join Date
    Oct 2007
    Location
    NZ
    Posts
    1,521

    Default May be useful for setting up a rigger.

    May be useful for setting up a rigger.
    This is info that I have that may be useful for those setting up a rigger. This is based on experience on the water and a LOT of reading.

    Qualifiers.
    I do not race, never have and probably never will.
    All my speeds are gps based. No timing or radar with one exception.
    I run on an unusual piece of water that is good for saw type runs. It is a keyhole shape and I stand roughly in the middle so i get one wide sweeping turn and one very tight turn at the bottom end. Even the sweeper is made at about ½ throttle. The bottom turn is minimum planning speed or a slow putter until it is pointing in the right direction for takeoff. I can get just on 100m straight if wanted.

    Both of my hulls are a bit different and I have a third on the build now.

    Here is the mid size one.
    https://forums.offshoreelectrics.com/...ead.php?t=3984

    And the larger one
    https://forums.offshoreelectrics.com/...ead.php?t=6940

    Two Major components of setup.
    1. AoA Angle of attack
    2. CG Commonly known as centre of balance or more accurately the longitudinal balance point. Also refered to as CofG or CofB

    Angle of attack.
    For my riggers I have done a lot of experimenting and find that close to 4deg AoA is good for the sponson. More AoA can cause excessive drag or blowover, a fine line here. Less AoA usually has caused drag and ploughing.
    I set the tub for 1-2deg Neutral is good but a bit of AoA is a help.

    CG.
    A common thing I read is that the CG should be where the turn fin is. I see it as the turn fin should be where the CG is. There is a difference as blind adherence to this rule may result in less than optimum performance. For a circuit boat the TF and CG should coincide.
    For my straight line boats The tf is very small and is only needed at lower speeds to pull the boat round to line up for another straight wot pass.
    My CG has been pushed back to 20%+ of the afterplane length. This is the distance between the rear of the planning surface of the sponson and the prop. As an initial setup 10% is a good guide and then onec AoA angles are set, I have moved the balance point aft. This loads the prop, preventing blowouts and loosens up the sponsons. Naturally this increases the chance of a blowover but that is the risk when speed is concerned.

    Measuring.
    All of my angles are measured with the hull on a flat surface (tf removed) so that the strut is flat and the angles can be accurately measured. They are checked each week before a run too.
    Fwiw my big rigger can safely run 65mph or 105kmh+ my small rigger runs 50mph+ or low 80’s(kmh) The small one was once police radar clocked at 101 kmh (61mph) as a one time nuts setup!

    I hope that some of this information is useful to folk who are setting up a rigger.
    See it....find the photos.....sketch it it....build it........with wood

  2. #2
    Join Date
    Apr 2007
    Location
    ma
    Posts
    8,693

    Default

    test
    Steven Vaccaro

    Where Racing on a Budget is a Reality!

  3. #3
    Join Date
    Jan 2010
    Location
    VA
    Posts
    1,218

    Default

    works, but the pics do not come up at all.

  4. #4
    legaloffer Guest

    Default

    works, however the images do not appear.
    8 ball pool

  5. #5
    Join Date
    Sep 2020
    Location
    Tx
    Posts
    287

    Default

    Quote Originally Posted by legaloffer View Post
    works, however the images do not appear.
    8 ball pool
    Possibly because the photos are 11 years old at this point, and have disappeared into the ether.

  6. #6
    Join Date
    Jan 2023
    Location
    GA
    Posts
    185

    Default

    Don't bother as its yet another one of many new spambot accounts running rampant in the forums, dragging out decade old post and making AI chatbot replies to them based on the words seen in other legit post. They are hiding external links in their replies to online video games, but you guys dont see them unless you are running dark mode because they are making the links the same color as the forum background

    Here is what Im seeing using a dark mode filter, and there are dozens of these spambots running around the site doing this
    Attached Images Attached Images

  7. #7
    Join Date
    Sep 2020
    Location
    Tx
    Posts
    287

    Default

    Wow, okay!

  8. #8
    Join Date
    Apr 2007
    Location
    ma
    Posts
    8,693

    Default

    Quote Originally Posted by Xrayted View Post
    Don't bother as its yet another one of many new spambot accounts running rampant in the forums, dragging out decade old post and making AI chatbot replies to them based on the words seen in other legit post. They are hiding external links in their replies to online video games, but you guys dont see them unless you are running dark mode because they are making the links the same color as the forum background

    Here is what Im seeing using a dark mode filter, and there are dozens of these spambots running around the site doing this
    Thanks for the post. If you see any others, please let me or Danny know.
    Steven Vaccaro

    Where Racing on a Budget is a Reality!

  9. #9
    Join Date
    Jan 2023
    Location
    GA
    Posts
    185

    Default

    No prob Steven, and I will start reporting them when I see them. I stopped because it seemed that nothing was being done when I was reporting them , but it could be that you guys aren't seeing the external links like I am, and these bot accounts can make post that look quite legit. They are typically just parroting what someone else in the discussion already said, sometimes even a literal copy/paste, but most dont look so closely at the other post within the discussion to notice it

Bookmarks

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
  •