TBG5

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Re: TBG5

Unread postby nomastomas » Tue Sep 12, 2017 12:59 am

Yeah, I boosted the nose to 3" and the tail to 7/8" at the stringer, but the V in the tail adding another 1/8" to the rail rocker. I also added more curve throughout the bottom, instead of the original, staged rocker. Intent here is to increase turning performance with a more continuous curve, since the board is already plenty fast. I think it will pay off more in larger surf. Although, I'd settle for some chest-high mush right about now.
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Re: TBG5

Unread postby nomastomas » Wed Sep 13, 2017 11:58 am

So...while I'm waiting for some decent waves to test this thing on, I thought I'd mention something I recently learned about carbon fiber. CF is about 5 times stiffer than S-cloth and 30% lighter. S-cloth actually has a slightly (6%) higher tensile strength-to-weight ratio and a slightly higher compression-strength-to-weight ratio. So, if you're looking for superior stiffness and lightest weight, carbon fiber is the way to go. But, if your looking for general toughness, S-cloth is the choice. S-cloth also cost about 60% less per yd. But, the "curb appeal" of carbon fiber is undeniable.
Here are some definitions:
Tensile Strength - Ability to resist a force before breaking
Elongation - Ability to stretch before breaking
Stiffness - Ability to resist deflection or deformation before breaking.
Density - weight/volume
"Toughness" - a combination of the first two stated above.

Here's a great video on a comparison between fiberglass, carbon fiber and kevlar https://www.youtube.com/watch?v=KHXVf0SaJpA
Last edited by nomastomas on Sat Sep 23, 2017 9:08 am, edited 1 time in total.
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Re: TBG5

Unread postby belly rider » Thu Sep 14, 2017 10:19 am

Wow another beauty
FERRARI red that is. :lol: :lol: :lol:
See you soon
its all about the ride
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Re: TBG5

Unread postby nomastomas » Thu Sep 14, 2017 10:29 am

EXACTLY!
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Re: TBG5

Unread postby krusher74 » Sat Sep 23, 2017 4:14 am

Very exciting design, Would love to try that finless. (maybe try again this winter :? )
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Re: TBG5

Unread postby nomastomas » Thu Oct 26, 2017 10:14 pm

After sitting in its new bag for over a month, I finally got a chance to ride my ne G5. Here are my first impressions:

Conditions: Glassy, 4ft-5ft beach break, mid-tide rising. SW groundswell, with a touch of NW windswell. Just a little crowded, with a dozen shortboarders of various skill levels competing for waves across two A-frame peaks about 50yds apart.
Performance: Almost identical to the G4 in paddling and duck-diving. Take-offs are the late drop-in variety, again similar to the G4. I thinned the tail on the G5 by moving the thick point forward, which allows the tail to sink more at the tail, providing a more forgiving take-off. (The G5 remains more parallel to the surface regardless of how steep the face on take-off.) Again, like the G4, the G5 immediately engages the wave face and holds. But unlike the G4 where the rider can feel this engagement primarily in the rear ¼ of the tail where the fins are, on the G5, the rider can feel the entire “wetted” rail engaged in the wave face. The G5 rail feels much more engaged to the point that I believe I can reduce fin area, perhaps significantly. (less fin area=less drag=more speed) While as tested (with my favorite quad fin set FCS H2) there was no significant increase in speed noted, but no loss of speed either, despite the fact that the G5 has more rocker on both ends. I did notice that turns were easier on the G5, which I attribute to the continuous rocker of the G5 compared to the staged-rocker of the G4. The ultimate test of the rail performance would be to ride the shape finless.

Summary: The G5 equals or exceed the performance of the G4 in every category. I need to do continued research to optimize ideal fin area for a given wave size.
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Re: TBG5

Unread postby bgreen » Sun Oct 29, 2017 4:25 pm

Hello Nomas,

I was interested in your comment: "I thinned the tail on the G5 by moving the thick point forward".

Do you have a comparative photo of the respective G4 and G5 foils? How far forward is the new version?

Bob
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Re: TBG5

Unread postby nomastomas » Mon Oct 30, 2017 11:33 am

Comparing foils is difficult because the thickness of the rail masks the centerline thickness. And rail thickness is oftentimes what I use to add or subtract overall volume, so there is no consistent rail thickness shape to shape. I had a 49" G4, but it was 1/2" wider at 22" and 1/4" less thick at 1.75". On this G4, max thickness starts at 15.82" up from the tail and ends at 27.5", while max thickness on the G5 starts at 17.67" up from the tail and ends at 25.81" up. So, about a 3" shift forward.
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Re: TBG5

Unread postby bgreen » Wed Nov 01, 2017 4:13 pm

Nomas,

Thanks. It's interesting to see the shift forward from the original Goddard models which had the thickness way back - now more like a modern standard board foil.
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Re: TBG5

Unread postby nomastomas » Wed Nov 01, 2017 5:12 pm

tb1.jpg
tb1.jpg (187.61 KiB) Viewed 18 times


This was my first T-Belly based entirely upon Goddard's work. It was 51" long and almost 3" thick. I found it hard to catch waves and prone to pearling on steep take-offs. I also found that it was not very good at holding into the wave face. It essentially felt too big for me in every dimension. A heavier rider might have had a much different opinion.

Over the next 7 years I made progressive tweaks in the shape, primarily thinning and shortening, but also playing with bottom contours. In each case, these changes were in service of my own biases, creating what I, personally, like to ride. Much of my foil changes have come from observing the shortboarders, with whom I frequently share a peak. Until the moment they stand up, they are essentially prone surfing. So, yes, my foil is now very similar to the common shortboard, albeit in a much shorter length.
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