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Thread: Build Log: IOM

  1. #111
    Join Date
    Nov 2006
    Location
    Northern VA
    Posts
    1,530

    Default Re: Build Log: IOM

    ok so I got home and started playing the bulbs.

    red line is existing fin location
    green dot is the balance point of the bulb
    Yellow line is fin centerline
    Purple line is center line of proposed fin location
    Blue line is proposed fin location

    I put cantilevered both bulbs onto a scale with the fulcrum at the yellow line and the leading edge of the bulb on the scale
    orange bulb displayed 30 grams
    black bulb displayed a whopping 285 grams.

    so I got creative and figured out a way to mount the orange bulb assembly to the Esterel in a temporary manner.

    Egad... minor success. with the trim weight well aft, and the battery midships the waterline location on the bow moved 5mm lower...IE the bow went up... with the balanced bulb.

    So. I'm going get the milling machine fired up and start cutting a new slot for the keel bulb. in the proposed location well forward of the balance point so the bulb is tail heav. remember I want to be able to have the trim weight and battery closer to mid ship for easier trimming.

    I hate drilling and machining lead....i've broken more bits with lead... ugh...Click image for larger version

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    Marc

    S1M 1981
    Victoria 81
    RG65 181
    IOM 81, 681, 881

  2. #112
    Join Date
    Nov 2006
    Location
    Northern VA
    Posts
    1,530

    Default Re: Build Log: IOM

    so did some work tonight moved the keel about 4 cm forward. the yellow line marks the original trailing edge location.

    going to float it tomorrow and see how it turns out. if the float works well, then I'll fill in the original slot with lead shot and epoxy.

    Click image for larger version

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ID:	15955Click image for larger version

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    Marc

    S1M 1981
    Victoria 81
    RG65 181
    IOM 81, 681, 881

  3. #113
    Join Date
    Nov 2006
    Location
    Northern VA
    Posts
    1,530

    Default Re: Build Log: IOM

    Well moving the bulb Did the trick. I still have to put the corrector weight aft, but the bow is just barely in the water.... and moving the battery forward drops the bow

    Now just need to fill in the old fin slot.

    Claudio. With the boat properly ballasted. To the iom min weight. She sits a but low in the water. When I remove the rig from the Boat 300 grams or so, it looks better sitting the water with the bow and transom just barely touching.
    Marc

    S1M 1981
    Victoria 81
    RG65 181
    IOM 81, 681, 881

  4. #114
    Join Date
    Nov 2006
    Location
    Northern VA
    Posts
    1,530

    Default Re: Build Log: IOM

    well she officially measured in. just need to send off the paperwork

    we did some testing against a mad max. able out point easily. but very similar speeds. if I was in front the mad max could not catch, if the mad max was in front i was not able to catch.
    Marc

    S1M 1981
    Victoria 81
    RG65 181
    IOM 81, 681, 881

  5. #115
    Join Date
    Apr 2005
    Location
    Toulouse (Fra)
    Posts
    3,167

    Default Re: Build Log: IOM

    Quote Originally Posted by marcsmith View Post

    Claudio. With the boat properly ballasted. To the iom min weight. She sits a but low in the water. When I remove the rig from the Boat 300 grams or so, it looks better sitting the water with the bow and transom just barely touching.
    Hi Marc, I suppose that some volume is lost, but I do not recall which design is concerned.
    Cheers
    Claudio

  6. #116
    Join Date
    Nov 2006
    Location
    Northern VA
    Posts
    1,530

    Default Re: Build Log: IOM

    compared to V9 and britpop, hulls seems slow... good start in clean air, and i was getting walked down easily

    on the down side, servo melted down and nearly burned a hole in the hull...at the Region 7 championship... so this hull might be toast.
    Marc

    S1M 1981
    Victoria 81
    RG65 181
    IOM 81, 681, 881

  7. #117
    Join Date
    Nov 2010
    Location
    Johannesburg
    Posts
    208

    Default Re: Build Log: IOM

    That's horrible news about the servo. Did the hull survive?

  8. #118
    Join Date
    Nov 2006
    Location
    Northern VA
    Posts
    1,530

    Default Re: Build Log: IOM

    inside is charred and the outside paint surface is bubbled.

    probably salvageable... with some sanding on the outside and add a small patch of glass and resin inside.
    Marc

    S1M 1981
    Victoria 81
    RG65 181
    IOM 81, 681, 881

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