Ive just bought a 8'8" JP Widebody and has a Quad fin configuration only ,
I bought it 2nd hand just as a extra in my quiver for when its a bit mushy or wind effected
Had my first proper surf on it today and it ticks most of the boxs , stable as a table , ease of catching waves, fast , but the fins are weirding me out , never rode a twinny or quad before and it is sliding out on bottom turns on bgger waves , think i will get the hang of it eventually , anyone got any pointers on handling the 4 fin wizardry ? 
Most probably, you are sliding out because you do not dig the rail enough in the turn, and the board is too flat on the water.
This is because you are not used to the increased fin area in the back, that tend to "stabilize" the board and level it back in turns.
Try pushing a bit more on the back foot, or move a bit more your back foot to the rear and inside rail, or soften the quad effect by putting smaller rear fins, symmetrically foiled. 2 "trailer" fins are nice for this. Or increase the front fins, or use ones with more grip, like C-Drives.
An analogy would be a car that would understeer with new, extra griping tires in the rear: you want to add some oversteering.
Select to expand quotecolas said...
Most probably, you are sliding out because you do not dig the rail enough in the turn, and the board is too flat on the water.
This is because you are not used to the increased fin area in the back, that tend to "stabilize" the board and level it back in turns.
Try pushing a bit more on the back foot, or move a bit more your back foot to the rear and inside rail, or soften the quad effect by putting smaller rear fins, symmetrically foiled. 2 "trailer" fins are nice for this. Or increase the front fins, or use ones with more grip, like C-Drives.
An analogy would be a car that would understeer with new, extra griping tires in the rear: you want to add some oversteering.
+1
Stomp on the kick pad with these bad boys on board = no slip 
Select to expand quotecolas said...
or soften the quad effect by putting smaller rear fins, symmetrically foiled. 2 "trailer" fins are nice for this. Or increase the front fins, or use ones with more grip, like C-Drives.
Thanks Colas and everyone ,
Board came with some FCS Hi 1 fins , think i will persevere for a couple more surfs and in corporate what you guys have told me before changing fins
C-drives look rad Brenno !
Hey Johnny,
I have a lot of time on quads from shortboards to kite and SUP boards. Quads usually require a bit of finesse on the bottom turn compared to a thruster, and you have to let the board run a little more. Ease into the bottom turn without being too heavy footed over the fins. Once you figure out where the sweet spot is you will adapt to it. On your top turn lay into those fins as hard as you like and enjoy the cool tail slides. If it's still too funky by all means start playing with fins, just be careful it turns into an obsession. Larger fronts will definitely help as well as those little stabilizer fins (if you have 5 boxes). Have fun and enjoy that quad fin speed.
Select to expand quoteexiled said..
Are those futures tabbed c-drives?
Indeed they are
Hello all starved seabreezers 
, I want to purchase some C-drive fins in a 4 or 3 fins setup to fit my shortSUP so to have some reference size what do you reckon of fins size to fit on a 6'6'' 28" 90 liters for my 80 kg body weight 
Thank you.
Select to expand quoteJohnnyclash said..
Board came with some FCS Hi 1 fins , think i will persevere for a couple more surfs
Wow, the HI (Harley Ingleby) are HUGE! The fronts as big as MR twins, they are designed for very powerful surfers, and need to be driven very hard, at speed.
Most probably you dont have the strength to drive them in the condition you were out.
So, solutions:
- move your rear foot back and stomp it!
- change for smaller fins, especially in bigger waves
Note HI are very good fins, I have a set I love on my 9'2" noserider longSUP, but they are quite specific: tons o'power but low drag (thin foil), and designed to work at speed
Kami said..
Select to expand quoteHello all starved seabreezers , I want to purchase some C-drive fins in a 4 or 3 fins setup to fit my shortSUP so to have some reference size what do you reckon of fins size to fit on a 6'6'' 28" 90 liters for my 80 kg body weight
Thank you.
Their sizing chart is very good, www.cdrivefins.com/pages/Sizing-Guide.html
I'd say L for Short SUPs, M for longer (> 7'6") SUPs
In quad setups, I undersize the rears, QS, or use standard fins in the rear. But as you love twinzers you may want to oversize them?
Hi Colas
Yes the FCSHi s are big fins !!!!
Its all making sense in what you are saying !
Cdrive fins look good and have got some great reviews
JP widebody is 8'8" ×32 @135 litres and im around 80 kilos , 52 year old been surfing for 30 odd years on and off any recommendations in the Cdrives
Thanks in advance
Johnny
I said: "In quad setups, I undersize the rears"
I must add I also undersize the rear C-Drive in thruster setups: for my 95kg it means XL Fronts + L rear
Select to expand quotecolas said...Johnnyclash said..
Hi Colas
Yes the FCSHi s are big fins !!!!
Its all making sense in what you are saying !
Cdrive fins look good and have got some great reviews
JP widebody is 8'8" ×32 @135 litres and im around 80 kilos , 52 year old been surfing for 30 odd years on and off any recommendations in the Cdrives
Thanks in advance
Johnny
I would follow their weight chart, undersizing a bit the rears: it means M fronts + QS rear.
L + QS could work too, a bit less row (thus harder U-turns in front of the wave), but more grip in turns that may help you with the extra volume of the board, especially if the JP widebody rear rails have volume (I never saw this board)
Thanks for this Colas
I just got a 7'2" x 28" Starboard Hypernut
I tried the board and it felt so good that I just had to get it...
It came with 4.7" IFT fronts and 4.5" IFT rears
I wonder if the board would be even better with symmetrical or 80/20 rears or slightly bigger fronts?
I am 84 kg...
