Offshore Tunnel Boats aka "Cats"
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Originally Posted by oldstuff
(Post 3061781)
Bob Nordskog had one and competed every year. |
I'm not 100% sure, but I believe that's the scaled up (30-32 foot) Seebold type tunnel that Jimmy Caldwell built and raced in an Offshore race in the Hudson river off Manhattan. Later Reggie wound up with it and the boat flipped killing a fellow from Connecticut named Sky Gillespie. Whatever it is, it looks like it is too big to be a KT (up to 23 feet).
T2x |
I think Mercury had a KT program as well.
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1 Attachment(s)
Heres a pic of one i have hanging in my office. I have no info on it, a friend found it at an estate sale and thought I'd like it. Appears to be very similar to the one above in size.
Wish i could scan it but this is about as good a pic as i could get with my celly |
Originally Posted by glassdave
(Post 3062434)
Heres a pic of one i have hanging in my office. I have no info on it, a friend found it at an estate sale and thought I'd like it. Appears to be very similar to the one above in size.
Wish i could scan it but this is about as good a pic as i could get with my celly Rich....your right about the length for the KT's, I just noticed how big that looked on that trailer. |
Originally Posted by Top Banana
(Post 3062496)
Dave... that is the Unlimited hydroplane that Don Aronow and Gary Garbrecht, built to compete against the big airplane engine unlimited hydros. It was early 80's sometime.
Rich....your right about the length for the KT's, I just noticed how big that looked on that trailer. Looks narrow, cant imagine it ran to well in unlimited against those monsters. |
Originally Posted by glassdave
(Post 3062434)
Heres a pic of one i have hanging in my office. I have no info on it, a friend found it at an estate sale and thought I'd like it. Appears to be very similar to the one above in size.
Wish i could scan it but this is about as good a pic as i could get with my celly |
Originally Posted by oldstuff
(Post 3063219)
I believe this boat was built by Seebold around 1980 and was rigged at Lake X with Cosworths. It was very diffucult to get on plane. Later I think it was repowered to Keith Blacks, it was fast but a little hairy and not dependable. Then it was rigged with V-8's and driven by Buck Thorton. I heard the last time it was seen was at Kramer's place "Apache". Reports were the boat was very well built.
T2x |
so what is the difference, if any, between an "offshore tunnelboat" and a "offshore Cat" ??? :party-smiley-004:
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Originally Posted by newbeee
(Post 3063274)
so what is the difference, if any, between an "offshore tunnelboat" and a "offshore Cat" ??? :party-smiley-004:
There is more details, but the evolution has been outstanding. |
Originally Posted by oldstuff
(Post 3063219)
I believe this boat was built by Seebold around 1980 and was rigged at Lake X with Cosworths. It was very diffucult to get on plane. Later I think it was repowered to Keith Blacks, it was fast but a little hairy and not dependable. Then it was rigged with V-8's and driven by Buck Thorton. I heard the last time it was seen was at Kramer's place "Apache". Reports were the boat was very well built.
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Originally Posted by newbeee
(Post 3063274)
so what is the difference, if any, between an "offshore tunnelboat" and a "offshore Cat" ??? :party-smiley-004:
A tunnel boat is a catamaran with "assymetrical" sponsons. The older designs (and one new one, Deep Vee Cats) have/had symmetrical sponsons. T2x |
Originally Posted by T2x
(Post 3063425)
Both are Cats... A catamaran is any twin hulled boat (sail or power....Add a third hull and it's a tri-maran.
A tunnel boat is a catamaran with "assymetrical" sponsons. The older designs (and one new one, Deep Vee Cats) have/had symmetrical sponsons. T2x Don't you think the concept has changed? The Cats today are more like scaled up OPC boats. What do you think? |
Originally Posted by oldstuff
(Post 3063502)
In the mid 80's, OPC tunnel boats started having 2 different sponson, due to the left turn. Some offshore boats had different sponson due to engine torque.
Don't you think the concept has changed? The Cats today are more like scaled up OPC boats. What do you think? Todays Offshore cats are not very different from the early designs with two exceptions.
At the end of the day the increase in power and prop technology is the main reason the current cats are going so fast. When we built the original Shadow cat we felt like 115-120 was the absolute maximum speed potential. There's a guy in Louisiana I believe who has brought his up to over 150.... proving it's all about the power and propulsion....... There's a lot of mumbo jumbo around the "design skills" of some of our current cat builders. Give me a builder with the most years of experience....because in high performance boats .....the top guys in the field learn a lot more from trial and error....then from computers. T2x |
Originally Posted by T2x
(Post 3063597)
There is nothing new under the sun. The original Jones and Cougar hulls back in the 70's were, in fact, scaled up from their earlier OPC designs.....and Jones' OPC designs were merely his cabover hydros with the sponsons lengthened to the stern. I raced a 1977 Molinari with one sponson altered forward to make left turns. it put me in the infield 2 times in the first and only race I tried it in. Later we put it back to its original form. I am not sure about any offshore cats with different sponsons , but I have seen offset cockpits and unequal sponsons in Unlimited hydros.....
Todays Offshore cats are not very different from the early designs with two exceptions.
At the end of the day the increase in power and prop technology is the main reason the current cats are going so fast. When we built the original Shadow cat we felt like 115-120 was the absolute maximum speed potential. There's a guy in Louisiana I believe who has brought his up to over 150.... proving it's all about the power and propulsion....... There's a lot of mumbo jumbo around the "design skills" of some of our current cat builders. Give me a builder with the most years of experience....because in high performance boats .....the top guys in the field learn a lot more from trial and error....then from computers. T2x Tunnel hulls are distinguishable from other catamarans by the typical close hull spacing and solid deck in between the hulls. After much real life testing and at the convention in Trondheim, Norway - 1989, ground effects in contained form became an applied science. There is more about how Reynolds Numbers fall into this subject, but it's a long science. You are 100% correct, All the years of trial and error proved that it is a science and not art form. Oldstuff |
Originally Posted by oldstuff
(Post 3066081)
....There is more about how Reynolds Numbers fall into this subject, but it's a long science...
It is actually a way to quantitatively compare, as a ratio, the two primary forces, inertial and viscous, in a specific flow condition. I remember lots of pages of discussion in my paper on transport phenomenon, regarding laminar flow, boundary layers, transition layers, and turbulence, all correlated to changes in the surfaces, expressed with Reynolds Numbers. Very dull tedious stuff at the time...who knew...years latter...knowing this stuff makes you understand how we go so fast. No question, there is allot of science in how we go fast. Trial and error or science, they both get my vote. Cool thread! |
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