Pro's & Con's between full tunnels and tunnels with center pods
#61
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Originally posted by BROWNIE
Not surprised to see the CF registration # on that weird boat, T2x.
Not surprised to see the CF registration # on that weird boat, T2x.
T2x
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Originally posted by TopSpin80
In my opinion it becomes a trimaran when the center 'pod' becomes the longer and bigger of the three pods. However I am sure there are many other opinions out there.... so let's hear them.
T2x in today's powerboat market there aren't many 'symetrical' catamarans offered. Most planing hulls do better without sponson symetry. Most catamaran sailboats however are dislacement hulls and therefore do better as a catamaran and not a tunnel.. plus they are going too slow to have any advantage in packing the air to create lift.
Ernie
what do you think?
In my opinion it becomes a trimaran when the center 'pod' becomes the longer and bigger of the three pods. However I am sure there are many other opinions out there.... so let's hear them.
T2x in today's powerboat market there aren't many 'symetrical' catamarans offered. Most planing hulls do better without sponson symetry. Most catamaran sailboats however are dislacement hulls and therefore do better as a catamaran and not a tunnel.. plus they are going too slow to have any advantage in packing the air to create lift.
Ernie
what do you think?
The ground effects discussion is interesting..in that we always put a small vee in our tunnels to provide a break in the air flow, while at the same time allowing for a slight cushioning/cutting effect in the event of direct water contact....... we also added graduated steps on the tunnel walls to provide increased lift as the tunnel submerged in rougher conditions..........best of both worlds methinks.
T2x.......
Last edited by T2x; 11-19-2003 at 11:07 AM.
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P.S....... to answer your next question.... NO, .... Catamaran design has not progressed beyond that design point...to date.
Deck lift..airfoil changes, rear overhang, horsepower, drives and propellers have been the primary focal points since then.
T2x
Deck lift..airfoil changes, rear overhang, horsepower, drives and propellers have been the primary focal points since then.
T2x
Last edited by T2x; 11-19-2003 at 11:12 AM.
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Originally posted by T2x
P.S....... to answer your next question.... NO, .... Catamaran design has not progressed beyond that design point...to date.
Deck lift..airfoil changes, rear overhang, horsepower, drives and propellers have been the primary focal points since then.
T2x
P.S....... to answer your next question.... NO, .... Catamaran design has not progressed beyond that design point...to date.
Deck lift..airfoil changes, rear overhang, horsepower, drives and propellers have been the primary focal points since then.
T2x
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Ok, T2's post reminded me of another difference on my boat. I highlited the corner of the hull (if the chine is on the outside, what do you call the inside corner?) to show where the change was made. On this hull the corner is square and sharp. My boat has a 45 degree bevel. This bevel changes from zero to 2" in width. It starts at zero, goes to 2" and then back to zero. It's widest point is around the point where the bottom flattens out. This was done to aid in turning. Many people have said that cats don't turn. Although this boat doens't turn nearly as well as my old v-bottom with a massive reverse chine, it doesn't do too bad either.
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Originally posted by Cord
Ok, T2's post reminded me of another difference on my boat. I highlited the corner of the hull (if the chine is on the outside, what do you call the inside corner?) to show where the change was made. On this hull the corner is square and sharp. My boat has a 45 degree bevel. This bevel changes from zero to 2" in width. It starts at zero, goes to 2" and then back to zero. It's widest point is around the point where the bottom flattens out. This was done to aid in turning. Many people have said that cats don't turn. Although this boat doens't turn nearly as well as my old v-bottom with a massive reverse chine, it doesn't do too bad either.
Ok, T2's post reminded me of another difference on my boat. I highlited the corner of the hull (if the chine is on the outside, what do you call the inside corner?) to show where the change was made. On this hull the corner is square and sharp. My boat has a 45 degree bevel. This bevel changes from zero to 2" in width. It starts at zero, goes to 2" and then back to zero. It's widest point is around the point where the bottom flattens out. This was done to aid in turning. Many people have said that cats don't turn. Although this boat doens't turn nearly as well as my old v-bottom with a massive reverse chine, it doesn't do too bad either.
As to cats not turning.....The only fools still spouting this crap are Vee bottom manufacturers.
It is common knowledge that the fastest...highest g force........ tightest radius..... racing machines on the planet are......
Tunnel boats....
or should I say ...Asymetrical outboard ram wing catamarans.
T2x
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Originally posted by cobra marty
Has anyone made a large ModVP? Kind of like a V in the front and Cat in the rear.
Has anyone made a large ModVP? Kind of like a V in the front and Cat in the rear.
The English predecesser hull set a record on Lake Wyndemere at some inflated speed with the Countess of Cantalope (or some such) behind the wheel.
T2x