Nope they are amazing. Great shows, always somthing new with guest singers, steel guitar players, drummers. Whatever. They keep it fresh. My dad is a big jorma fan and in the jack fan. Ofcourse they are both great. Fur peace ranch.....i suggest going barry. Its jormas spot in ohio. They do shows there. Sometimes electric hot tuna, sometimes just jorma, always diffrent. But it's a super small and intimate setting. Great to watch them play there. Me and pops go when we can, usually one a year
I think Venturi bottoms work... but not due to the Venturi effect. A pipe is a closed system... the bottom of a board is not. So the theory that water speeds up aftward through the narrow section, causing an "equal but opposite reaction" to occur on the board (creates a forward force resulting in increased speed) doesn't apply. It does, however, force more water through the fins which makes them do a better job at what they do... which is create lift and drive.
Yes, even though it is not closed (like a pipe in the typical venturi effect diagrams), I figured the increased water velocity would create a pressure gradient (decrease), thus lift, drive, and speed. So yeah...
Great post. I imagine the side fins (tipped out and assymetrically foiled) as mainly contributing to lift. Isn't this venturi bottom (if set up as a tri anyway) leaving the side fins out of the area of increased flow? I've never been able to understand the physics of how a vertical trailer fin creates lift.
As water flows through a Venturi system, pressure... relatively speaking... goes from low in the wide entry area, to high through the narrow section, to low again. Bernoulli's Law says the fluid's velocity also goes from low, to high, to low when passing through the Venturi array. So any increase in water velocity and decrease in pressure behind the narrow section would be offset by the increase in pressure and resulting drag created ahead of the narrow section. So in my mind, there is no net increase in lift or velocity overall. Keep in mind that we're looking at a flat surface and assuming water moves from nose to tail in a straight line. This is not the case. Water always flows across the board at an angle, and this is where the contour effectively redirects water that would normally flow off the rail toward the tail and more importantly the inside of the opposite fin, if there's a fin inside the feature. Mitch is right... a symmetrical, vertical trailer creates no lift. It is simply a stabilizer ("directional stability") and adds forward drive in turns. No lift. But an asymmetrical, canted fin does create lift, similar to an airplane wing, where pressure on the "up" side of the fin, which is curved, is reduced and a net force is created upward by the relatively higher pressure on the flat side. If you force water into the flat side of the fin by some bottom feature, it amplifies that affect by creating an even higher difference in pressure. Toe that fin in, and you not only get an "up" force but also a forward force, called "thrust." Hence, the "thruster."
Man if I had a teacher that could explain Venturi and Bernoulli to me like this, I might not have grown up into a grunt. Kudos maestro
Dude....Im not mejicanos. I am Boricua. You beaners use spanish weirdly.....eating too many frijoles, hermano.
I like riding them all. I have 8 different bortes between 5’2” and 9’4”. I try to ride what the wave dictates, but don’t always get it right. I don’t load up the logs enough, because that requires effort to strap on the Jeep.... I think my next board will be a mini log that’s good for nose riding. Maybe something 7’6”-8’0”. Saw a guy styling with one down in Ft. Pierce. I also really like the look of this bonzer, but I just don’t know how it would handle in our waves. Thoughts? Need to find one to demo.
The good old bonzer. Rode them for years. Eaton Bonzer to be specific. I think it was maybe a 7'? Maybe a little smaller - I don't remember exactly. Board had great drive. Not the best turning board as it tends to track buy very fun. I think the newer designs on the smaller boards address the "tracking phenomenon". There is a whole pack of dudes on Oahu that strictly ride bonzers (malcom Campbell is a godfather of the design and used to own a shop in Haleiwa called Bonzerfront). He owns a eatery that has boards on wall. You can still get boards. The dudes who ride them are down the line, speed rippers.
I absolutley love my bonzer. For two reasons.... 1) it's a freaking work of art man. Seriously. Im a board finatic so ofcourse i say that right? But it's not like that. It's a board i'l never get rid of. I can't walk into my board room without stopping and feeling her up. 2) it works man. Lots of speed and drive. Mines bigger (6'6) and is suited for bigger waves. I really like mine when it's huge but not death barrels, big open face rollers. Which is rare. Or i like it when it's smaller, maybe chest to shoulder, but really fast. I personally wouldn't get one for small weak waves. Ofcourse the board itself dictates the waves you ride it in, the bonzer aspect is just the bottom and fins. Big open face cutback on a bonzer...... it'll blow your mind
^^^Yup... That's exactly what they where designed for - holding speed and drive through turns. I think they work best in bigger surf.... around head high and up.
