No, in reply to your kind enquiries, I still have no idea how I will steer ZBF in practice!
I have faired the VHE (or stalk) as an airfoil about 50mm wide, and the rudder is conventional (sorry), but what is exercising (what passes for) my mind is the roll centre of the boat, and the path the hull wil take when turning.
I believe that the boat will pivot in roll at about water level, so a good roll will swing the hull out to one side - similarly the effect of rudder will (I think) be to describe a curve where the hull turns well outside the bit on the surface
Who said that sounds comical, or was it conical?
I hope that this effect will be useful in rounding marks, so long as I don’t allow the hull to snag on the buoy tether (or another footy’s keel)
I am contemplating adding a slew of ultra-bright LEDS to the top of my hull to see where it is going.
Firstfooty, I am relying on you being there to translate if you can supress the helpless chortling.
Er, what is what you said? And how might I have violated it?
Btw would I call “underwater” when claiming my rights?
I know ZBF is footy legal - she fits in the box (I have even made a folding fairlead to satisfy Roger)
and she sits in the footy stand
I didn’t show this one before in case anyone thought I was somehow frivolous:D
andrew
What a weekend!
Took a day off on Friday and had a day at a toy boat show - met up with lots of friends, old and new
Saturday - Ballasted ZBF in the DFTF
Still a little heavy - I want the BC no more than kissing the surface
Had a test sail of ZBF on a canal - no pictures because of insufficiency of hands and gale-force wind.
Memo to self - use MUCH softer z-bend wire for ZBF
As the wind eased off Took some pics in the garden pond - good movement but a very restricted environment
I am having to learn a new way of thinking in trimming and ballasting her. I can confirm that she rolls like a Flower class - so I NEED to soften that sail
andrew
Woe and thrice woe!
ZBF appears to have abundantly justified her manufacture.
Not only has she added to the comradely discussion of the whichness of the what, but in extremely light winds she moves at a ridiculous velocity:D
Particularly downwind:
It seems I am getting a little hydrodynamic lift from the BC, or possibly it doesn’t mind a little immersion.
It is so stable and happy downwind that I might have time to take photos and enjoy firstfooty’s downwind legs:D
Praps she is a light-wind boat - the inherent design issues certainly suggest that
Very low wetted area, and a not-too-knobbly shape contribute to good speed thru the water, and indeed at the moment she is not happy in a blow because the hull is lifted sideways as the wind pressure heels the boat.
Andrew ~ i cant make up my mind if you forgot the RNLI logo or if this is the new vehicle for Minime in the latest Austin Powers movie or your being paid by the Dutch developing a craft for their canal systems
As I mulled the design options for my peristaltic rudder for ZBF I considered to failure modes - including one of the tubes leaking or breaking.
This could potentially flood the hull of ZBF and lead to sinking (even more than usual).
I DO listen to my friend AndyT, even if our conversations do spark slightly tangential conversations. Anyway one such conversation has produced an idea which could protect ZBF from this or other possible deluges.
There is plenty of space if the hull of ZBF around the radio gear, AAs, GPs and torpedo tubes and I could lay on the bottom a teabag full of baking soda.
Any water getting into the bag would cause wigorous effffervescence and the production of gas (co2) - hopefully in enough quantity to avoid sinking! Bubbles and a rise above the normal water level would be a sign that the anti-sink had been activated.
Have you always been a wild optimist?
Perhaps I should add some uncured PU adhesive which foams wildly when it comes into contact with water - thus forcing the water out and sealing the leak at the same time (and simultaneously)
I will make a peristaltic test rig and fit a masthead float to be equipped for all potential events.
hey! I can make the pennant out of a tube of thin mylar - and fill this with the baking soda so that if immersed it inflates to a giant airbag and salvages the boat off the floor .
actually, I might be able to make good use of a lump of sodium that way - it generates hydrogen in contact with water - does my boat have to be touching the water to win?
I feel a mild sensation of guilt/pride about this thread - it spawned some splendid and outrageous flights of fancy - many of which got at least started.
I am going to re-read the thread and seek to find out how the various projects went.
I can answer for mine:
Overall - slower that intended. ZBF got built and troubled the Guardians of Orthodoxy if not (yet) the scorers. Sloice is sailing, but neither of my squareriggers (neo-nao and squareFoot) have moved far. Pants/BLX has not progressed further than an in-depth feasibility study and painstaking semantic analysis of tmark’s emails.
Contributors please tell us how they turned out - and did you enjoy it?
NSLs - how is it for you?
andrew
and realise that they are a total rip-off of my ZBF:mad:
Notice how the mouse finks have copied my hull-form. Did they have a problem with getting it homologated, I wonder.
But this boat dates from the 1960s so they must have used a time machine to read this thread.
Look at the tiny size of the foils, especially when it is clear that the foils must be controllable in pitch and yaw.
I have seen that ship somewhere before, it was a combination of SWASH Small Waterplane Area Single Hull, and foiling ability
You say you’ve been researching foils…
I was thinking the very same thing, and came across a wonderfull book ‘HYDOFOIL SAILING’ in my uni library, so i may well experiment.
I’m just trying to decide on a hull form, and foil arrangement (so many to choose from )
