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  1. Replies
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    Thanks, Ron. Technical articles available here:...

    Thanks, Ron. Technical articles available here: aeromarineresearch.com/performance_articles.html
  2. Thread: Bob Switzer

    by Jimboat
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    1,921

    Bob Switzer

    A sad day in powerboat history. I just heard that Bob Switzer, hero and friend, passed away on Friday December 29, 2017. A true hero. Will be remembered as one of the really true innovators,...
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    here is an article on 'Rooster Tails...

    here is an article on 'Rooster Tails'
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    3,398

    Sounds like a fun project!

    Sounds like a fun project!
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    Update - TBDP/VBDP performance software Version 8...

    Update - TBDP/VBDP performance software Version 8 now includes spray rails, lifting strakes and trim tabs. (plus a bunch of other new features!)

    Spray Rails are normally on chine/sheer and can...
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    Yup, for sure! Sounds like you're much too low. ...

    Yup, for sure! Sounds like you're much too low. Raise motor, make sure you're still getting water (get a pressure gage). Test for new surfacing props.
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    Joe - true enough. As i suggested, nearly every...

    Joe - true enough. As i suggested, nearly every hull design is a "compromise" of many performance desires/expectations. Given an existing vee hull design of weight/size/power - the best pad design...
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    Every hull design/setup has an optimum pad design...

    Every hull design/setup has an optimum pad design (width, length, depth) for the desired performance expectations. The tricky part of the design is that the characteristics change at each velocity...
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    nice boat! if you size the pad correctly, it...

    nice boat! if you size the pad correctly, it should be a winner!
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    no problem, chris. give me a call or PM me, if...

    no problem, chris. give me a call or PM me, if you want to discuss.

    /jim
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    The size of the pad should be designed so that...

    The size of the pad should be designed so that it's sufficient to provide greater portion of dynamic lift of the hull. A wider pad is more efficient, but also harder ride. Hulls with high deadrise...
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    1. what is your rpm currently, vs. max rpm of...

    1. what is your rpm currently, vs. max rpm of engine?
    2. can you send me a picture of your hull running at current top speed?
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    Nason - sorry to avoid the 'quick' answer...to...

    Nason - sorry to avoid the 'quick' answer...to make performance assessment of your 2 boats, we'd need details of each design, and power/weights for each setup, and would then do a dynamic performance...
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    Agree completely with Yellowjacket. A pad can...

    Agree completely with Yellowjacket. A pad can really make a vee hull fly. Each pad should be designed particularly for the hull, power, setup and expected use (speed), however. If not enough pad, the...
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    The sizing of a pad can be designed for the...

    The sizing of a pad can be designed for the specific hull dimensions, weight, HP, etc. (Duplicating a pad from one hull on a different hull might not work out as well).

    A proper pad design...
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    Looks good! is that the tunnel design that we...

    Looks good! is that the tunnel design that we corresponded about recently? The modelling we did showed some good results. Glad that the testing is showing same. Send me some details of your...
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    Sam - this must be one of the very first...

    Sam - this must be one of the very first hydraulic trim systems! who do you credit with inventing it?
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    what year of manufacture do you think that trim...

    what year of manufacture do you think that trim piece is, Sam?
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    zul8tr - yes. you're right. I've corrected the...

    zul8tr - yes. you're right. I've corrected the website (typo). I am not sure which version of TBDP software you have, but your TBDP User manual reflects proper info (but no typo!). thanks.
    Just give...
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    Sure... Velocity Optimize – [Trim Angle...

    Sure...

    Velocity Optimize – [Trim Angle specified, Maximum Limiting Velocity determined] - use to get an estimate of the velocity that is achievable at a specified trim angle (WAngle) OR (with...
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    Mark - your new design looks very innovative. i'm...

    Mark - your new design looks very innovative. i'm glad that the TBDP software has worked so well for you. Your hull is a great looking boat! Good work!

    I note you're using an "s-shaped" aerofoil...
  22. Thread: Cool Fuel

    by Jimboat
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    5,758

    cool cans in U & S-class tunnels

    OMC factory tried cool cans in U-class boats in 70's on V4's. They used dry ice in an aluminum can, with fuel running through a coil inside the can. i don't really recall any of the other details,...
  23. Thread: hydro ID?

    by Jimboat
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    3,174

    Barry - WOW! You're a real detective. that...

    Barry - WOW! You're a real detective. that should be sufficient info. thanks a lot!
  24. Thread: hydro ID?

    by Jimboat
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    3,174

    Unidentified?

    Boy! I thought you'd get it for me, Ron. The boat was originally in Ohio. The owner said the company that made it made only 2 of them. Current owner is trying to identify the maker. It is...
  25. Thread: hydro ID?

    by Jimboat
    Replies
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    3,174

    hydro ID?

    Does anyone recognize this hull? builder?
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