The program xflr5 I have not been able to simulate the keels of surf to subject them to turbulence, I can do it in another program type solidworks but I do not get the halos of stability, so for now this idea I leave
Your hand wringing concern about a possible VENTURI EFFECT, being somehow detrimental, is exactly the effect that I intended to create. A low pressure area, between the fins, helps to sustain water flow during high AoA maneuvers. It is what makes the (my) twin pairing of fins, work so well. Test your own theory/beliefs in the water! Step away from the keyboard, and into the shaping room! Better yet, start your own thread to discuss your theory/beliefs, and experiences in the water. I'm sure you'll draw more attention to your subject, and concerns.
Just want to bring this thread back to life. I didn't believe the fin setup when I first saw it years ago, but I gave it a try and I can't find anything negative about it. other than needing 2 boxes and 2 fins. I've tried 3 or 4 different size and shapes of fins and I haven't had a bad experience using it yet.
Took my old Thrailkill twin single fin out again and had a lot of fun. I last rode the board as a single and it was a lot of fun too, but I hit a rock and popped the fin box up. When I fixed the board, I removed the center box, so it's now just a "twingle".
The best part of making your boards is being able do anything you want. Experimenting with very unusual designs has made surfing so much more fun. Best part is when you get compliments on the boards you make and especially when you get compliments on riding them.
Mahalo Nui Loa to Bill Thraikill for sharing his Mana'o and opening our eyes.
I use both. I made 3 sets of fins a few years ago, 5" 6" and 7". The smallest are double foiled and the other 2 are single foiled fins. I have 2 boards with Bill Thrailkill's "twingle" and I've made 2 NPJr Duos.
The first time I used this board I had two 9" standard cutaway fins that I had been riding in my 8' eggs. The board worked fine, but I think the fins were too long. I used single foiled fins with the flat side out and it felt really good, but the board is very flat through the middle and tail. Because of the low rocker, I didn't use it much, but it is a vey good board for smaller weaker waves, and it works great in waves from head high down. I used the small set of double foiled fins yesterday and it was a lot of fun. For a board with very little tail rocker, it turns easily.
I'll try to take some photos of the board as it is now. This is the original board I made years ago, but it had a massive delam. I made the mistake of leaving it in the sun too long. The hump on the deck is a 1/2" high delam. It was also just a bit too wide for me to comfortably carry, so I cut it open to fix the delam and narrow it a bit. I was able to change the outline a bit. The bottom is the same except I took out the middle box. Funny thing is I didn't put a leash plug in this board and have never ridden it with a leash, but it works well and I haven't had to swim much when I've used it.
Bill gave me a template for his 8' x 21" Hawaii gun. I've made about 4 boards using the rocker, and 2 using the outline. I used of of those boards last summer during a hurricane swell and had an intense barrel on it, but got eaten up. There was a photog out shooting 5 young pros that day, the Moniz brothers and others I don't know. He was right there when I got that wave and I asked him if he shot it, but he didn't. He did say he watched it, and a couple others saw it so I was stoked.
Here's the board as it is now, it is 7-2. I stripped the deck skin off and used balsa as the new deck skin. The outline was pulled in a little, and the center box was replaced with balsa. I must have had a leak where the boxes were for a while because the skin shows water damage. These are the fins I made for the twin single boxes. The blue fins have a foam core and they are about a 1/2" thick. The small fins are made from g10 and I layed up the yellow fins myself. I have the yellow fins in another "twingle".
Good for you. You just inspired me to ride my twingle again. I really want to try the twingle setup on a longboard. For some reason I feel it would help hold the wave during nose rides.
The program xflr5 I have not been able to simulate the keels of surf to subject them to turbulence, I can do it in another program type solidworks but I do not get the halos of stability, so for now this idea I leave
I have to do tests on keel size and distance to tail but if I want to keep distances from this table http://www.mckeesurf.com/wp/wp-content/uploads/2012/10/table_02.jpg
table_02 (1).jpg
Your hand wringing concern about a possible VENTURI EFFECT, being somehow detrimental, is exactly the effect that I intended to create. A low pressure area, between the fins, helps to sustain water flow during high AoA maneuvers. It is what makes the (my) twin pairing of fins, work so well. Test your own theory/beliefs in the water! Step away from the keyboard, and into the shaping room! Better yet, start your own thread to discuss your theory/beliefs, and experiences in the water. I'm sure you'll draw more attention to your subject, and concerns.
Bill Thrailkill
SHAPER SINCE 1958
Just want to bring this thread back to life. I didn't believe the fin setup when I first saw it years ago, but I gave it a try and I can't find anything negative about it. other than needing 2 boxes and 2 fins. I've tried 3 or 4 different size and shapes of fins and I haven't had a bad experience using it yet.
Took my old Thrailkill twin single fin out again and had a lot of fun. I last rode the board as a single and it was a lot of fun too, but I hit a rock and popped the fin box up. When I fixed the board, I removed the center box, so it's now just a "twingle".
The best part of making your boards is being able do anything you want. Experimenting with very unusual designs has made surfing so much more fun. Best part is when you get compliments on the boards you make and especially when you get compliments on riding them.
Mahalo Nui Loa to Bill Thraikill for sharing his Mana'o and opening our eyes.
Howzit sharkcountry,
Just curious, are you just using regular double-foiled fins or asymmetric/single-foiled ones?
Many thanks,
Andrew
I use both. I made 3 sets of fins a few years ago, 5" 6" and 7". The smallest are double foiled and the other 2 are single foiled fins. I have 2 boards with Bill Thrailkill's "twingle" and I've made 2 NPJr Duos.
The first time I used this board I had two 9" standard cutaway fins that I had been riding in my 8' eggs. The board worked fine, but I think the fins were too long. I used single foiled fins with the flat side out and it felt really good, but the board is very flat through the middle and tail. Because of the low rocker, I didn't use it much, but it is a vey good board for smaller weaker waves, and it works great in waves from head high down. I used the small set of double foiled fins yesterday and it was a lot of fun. For a board with very little tail rocker, it turns easily.
I'll try to take some photos of the board as it is now. This is the original board I made years ago, but it had a massive delam. I made the mistake of leaving it in the sun too long. The hump on the deck is a 1/2" high delam. It was also just a bit too wide for me to comfortably carry, so I cut it open to fix the delam and narrow it a bit. I was able to change the outline a bit. The bottom is the same except I took out the middle box. Funny thing is I didn't put a leash plug in this board and have never ridden it with a leash, but it works well and I haven't had to swim much when I've used it.
double_fin_web.jpg
Did Bill ever give anyone a new board as requested?
Personally I'm always ready to learn, although I do not always like being taught. - Winston Churchill
Bill gave me a template for his 8' x 21" Hawaii gun. I've made about 4 boards using the rocker, and 2 using the outline. I used of of those boards last summer during a hurricane swell and had an intense barrel on it, but got eaten up. There was a photog out shooting 5 young pros that day, the Moniz brothers and others I don't know. He was right there when I got that wave and I asked him if he shot it, but he didn't. He did say he watched it, and a couple others saw it so I was stoked.
Here's the board as it is now, it is 7-2. I stripped the deck skin off and used balsa as the new deck skin. The outline was pulled in a little, and the center box was replaced with balsa. I must have had a leak where the boxes were for a while because the skin shows water damage. These are the fins I made for the twin single boxes. The blue fins have a foam core and they are about a 1/2" thick. The small fins are made from g10 and I layed up the yellow fins myself. I have the yellow fins in another "twingle".
7-2 twingle.jpg
IMG_2613.jpg
IMG_2614.jpg
IMG_0691.jpg
IMG_0689.jpg
Good for you. You just inspired me to ride my twingle again. I really want to try the twingle setup on a longboard. For some reason I feel it would help hold the wave during nose rides.
Send me your dinged, damaged, and yellowed.
Bill Thrailkill
SHAPER SINCE 1958
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