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Surfboard volume = your weight / 6

S

surfwhere

Gerry Lopez status
Aug 5, 2008
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sh3 said:
Hard to follow that, but here's what I'm curious about: Every JS team rider is exactly 183 cm tall?
Click to expand...
I'll let you guys write letters to them about the accuracy of their data.

In short dividing by 6 is a factor just like the Guild Factor. 6 just happened to be what worked out when whoever it was divided weight by volume and then saw an average over a group of similar skilled shortboard surfers who were likely more advanced than down the line surfers. It works pretty darn good for shortboard surfers. For different groups of surfers or board styles the divider is going to be less or more to be accurate in those instances, just like how GF changes.

Forgetting about GF and just using the divider, an example might be you weigh 170 and like your stock 5'10x 19 3/4 x 2 7/16 x 32.03 White Diamond but you gained 10 pounds. 170/6 is 28.33 so that ain't gonna work. 170/32.03 is 5.46. 180/5.46 is 32.97 L and is likely the best move to start. In the files if we increase by 1/16 thickness for 5-10 pounds of added weight, you get 33.11 L. The divider factoring worked out pretty good as a predictor.
 
Duffy LaCoronilla

Duffy LaCoronilla

Duke status
Apr 27, 2016
43,543
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surfwhere said:
I'll let you guys write letters to them about the accuracy of their data.

In short dividing by 6 is a factor just like the Guild Factor. 6 just happened to be what worked out when whoever it was divided weight by volume and then saw an average over a group of similar skilled shortboard surfers who were likely more advanced than down the line surfers. It works pretty darn good for shortboard surfers. For different groups of surfers or board styles the divider is going to be less or more to be accurate in those instances, just like how GF changes.

Forgetting about GF and just using the divider, an example might be you weigh 170 and like your stock 5'10x 19 3/4 x 2 7/16 x 32.03 White Diamond but you gained 10 pounds. 170/6 is 28.33 so that ain't gonna work. 170/32.03 is 5.46. 180/5.46 is 32.97 L and is likely the best move to start. In the files if we increase by 1/16 thickness for 5-10 pounds of added weight, you get 33.11 L. The divider factoring worked out pretty good as a predictor.
Click to expand...
No matter what stupid name they come up with to calculate my basic volume they all come up the same number which can be found by dividing my weight by 6.
 
S

surfwhere

Gerry Lopez status
Aug 5, 2008
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Duffy LaCoronilla said:
No matter what stupid name they come up with to calculate my basic volume they all come up the same number which can be found by dividing my weight by 6.
Click to expand...
Stoked for you! You're perfectly average and it's easy math, your life couldn't be any simpler. I could divide by 6 for most of my life but now that I'm in my 50s with a semi bad knee and repaired shoulder it doesn't work for me anymore. My two new boards are near Rob's ratios when he was in his mid 50s, around 5.3 is my current divider. I haven't had a chance to get used to them but I know that's what I need unless I lose about 10-20lbs while gaining strength. If I can't get used to the volume in 5'7 and 5'10, I might try the same or a little less volume in my old shortboard lengths of 6'0 and 6'2

Guild Factor comes from the name of the guy that came up with it and the ranges, it's not just marketing. Whitney Guild and his family have been in California surfing for a long time. Here is a picture of his Walk of Fame plaque https://flic.kr/p/7LSSpN and here is an interview with him
 
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Duffy LaCoronilla

Duffy LaCoronilla

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Apr 27, 2016
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surfwhere said:
Stoked for you! You're perfectly average and it's easy math, your life couldn't be any simpler. I could divide by 6 for most of my life but now that I'm in my 50s with a semi bad knee and repaired shoulder it doesn't work for me anymore. My two new boards are near Rob's ratios when he was in his mid 50s, around 5.3 is my current divider. I haven't had a chance to get used to them but I know that's what I need unless I lose about 10-20lbs while gaining strength. If I can't get used to the volume in 5'7 and 5'10, I might try the same or a little less volume in my old shortboard lengths of 6'0 and 6'2

Guild Factor comes from the name of the guy that came up with it and the ranges, it's not just marketing. Whitney Guild and his family have been in California surfing for a long time. Here is a picture of his Walk of Fame plaque https://flic.kr/p/7LSSpN and here is an interview with him
Click to expand...
I’ll be 54 in a couple months and can give you quite a list of injuries.
 
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F

freeride76

Miki Dora status
Dec 31, 2009
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Oh sh!t, Guild Factor is an actual thing.

I thought you were having a go Surf Where.

OK, I'll apply myself to comprehension with a little more zeal.
 
M

Mr J

Michael Peterson status
Aug 18, 2003
2,371
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Regional Vic, Australia
surfwhere said:
...
The ranges and slider used on the Roberts site are located here. https://www.robertssurf.com/volume-finder.html#/.
...
Click to expand...
I did a Guild Factor reverse lookup on the Roberts site (I know my weight and shortboar volume range) - I'm "Casual Surfers, Old Salts, or Working Stiffs wanting best float to catch more waves " :)

Its good that the Roberts site gives suggested starting points for each model based on Advanced, Intermediate Novice although Novice needs some explaining - my idea of Novice is shouldn't be on a shortboar in the first place! Regardless, I like that they have effectively given a volume range for each model which should help the purchaser avoid requesting something stupid.
 
M

Mr J

Michael Peterson status
Aug 18, 2003
2,371
1,593
113
Regional Vic, Australia
Aruka said:
...
When I first started working out more I had to force myself to eat extra but now my appetite is crazy high and I find it hard to limit myself when it comes to high calorie, high fat foods like chicken thighs, beef, greek yogurt, peanut butter. etc. I still have the tendency to eat a little smaller breakfast and lunch and then chow heavy for dinner which I know is not ideal. If I don't eat enough for dinner I wake up in the middle of the night starving.
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I've got a GI problem so I eat my biggest meals later in the day and with an installment just before going to sleep to maximise my weight - it doesn't seem to be doing me any harm in terms of the usual health markers such as cholesterol, triglycerides etc. The inflammation marker was right down too. Always a decent amount of fat and protein in my meals, although I prefer fish to beef or chicken. I do eat all 3 of those as well as things such as nuts, peanut butter, avocados stir fried veggies.

I've got more serious about strength training in recent years to help stop my body from having bio-mechanical breakdowns. When I was a younger weekend warrior I was more into aerobic capacity training - a couple of times a week I used to do things such as "hypoxic swimming" - build up to a pyramid set of a breath once every 7 strokes from a starting point of 3, then back down to every 3 strokes one 25m length at a time. Another thing I did was "inefficient swimming" - front crawl with my head out of the water. I don't know how scientific this was, my reasoning was that with limited skills and surf time I would at least have the fitness to handle prolongued hold downs and not get into trouble. Nowadays I just prefer to surf small waves and being closer to the beach I'd rather surf, fitting in some strength training then uses up all my energy budget.

At the moment I'm starting my session off with a 10 minute breast stroke swim to build up the delts after rotator cuff surgery, that's a temporary state of affairs.
 
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Duffy LaCoronilla

Duffy LaCoronilla

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Apr 27, 2016
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Mr J said:
I did a Guild Factor reverse lookup on the Roberts site (I know my weight and shortboar volume range) - I'm "Casual Surfers, Old Salts, or Working Stiffs wanting best float to catch more waves " :)
Click to expand...
Did same. It gave me a GF .37.
 
S

sozzle

Michael Peterson status
Feb 23, 2009
1,986
340
83
Retropete said:
Today's weigh in: 174. 3 weeks in the Philippines. Then caught Covid on the plane ride home and sick as a dog all this last week.
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the rona got me down to 138lbs the other week, last thing i needed was weight loss... my hpsb GF is .41, no fVcking way i can be dealing with a duffy GF these days.
 
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bigglesworth

Nep status
Mar 8, 2017
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sozzle said:
the rona got me down to 138lbs the other week, last thing i needed was weight loss... my hpsb GF is .41, no fVcking way i can be dealing with a duffy GF these days.
Click to expand...
Each time i got the rona, automatic 10lb deduction

gf .42 or shade higher usually.
 
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Bluehorn

Oct 12, 2023
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Corpus Christi
That would have been spot on for me when I was younger and would have surfed a sub 30 liter board at 185 lbs. Now that I am over 50, 200 lbs and surf a lot of wind slop, I have a board for really mushy “Victory at Sea” days when I need to get salty and then my regular board for halfway decent and good days. My Victory at Sea/Uber groveler is a 6’2 Sweet Potato at 52 liters!!!! I can actually have fun and surf twice as often with that board. Even my daily driver is a bit bigger than his estimate at 42 liters vs 38 liters for an intermediate. I am not really an intermediate, but I am old and was supposed to have a lung transplant after being in a 2 month long comma with COVID. My problem is catching waves, but considering that I am supposed to be dead, I am more than happy to add a few liters if it helps me catch waves. With my experience, I really don’t have a problem turning a higher volume board so help caching waves and paddling is more important for me. I have caught waves with a low 30 liter board, but it was a real struggle paddling and catching weak waves with my decreased lung capacity thanks to my scarred lungs.

I definitely think it is a good starting place, but it needs other factors to include for helping people find the right volume.
 
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