Fin foil question

Recently I made a wood fin (Beech and Koa) for a guy and asked to get an honest opinion as to the fin’s performance.  I don’t know the guy and we barely talk, so this is all I have to work with.

Here is what I got in response…“I took my Eliminator to PB point this morning in shoulder high waves and it performed well overall. It held on the nose and turning was fine. The only thing is it lacked projection out of the turn. Maybe fatttening up the foil a bit might help.”

I am happy with the review, however how do I fix the “lacked projection out of the turn” on the next fin?  I thought projection had more to do with the base length on the fin.

Thanks,

Dave

Any and every aspect of shaping design AND rider ability affects "projection" out of turns.

It could be fin placement (too far forwards), weak waves, or lazy rider.

But overall, more fin area, usually thru more base area, but can be thru more sheer length.

Thicker foils work like more fin area, but can be more pivoty, less sheer holding power at speed.

[quote="$1"]  ... it lacked projection out of the turn. Maybe fatttening up the foil a bit might help."... [/quote]

Actually quite an insightful observation on his part.    In my experience with thick foiled fins, the projection and drive was outstanding.  

This happens to be my pet peeve in production LB fins.  The panels are laid-up with just slightly more glass than the thickness needed to make the base fit the slot.  I guess this speeds up production, but leaves a thinly foiled base to the fin.  A certain American manufacturer (who posts here often) uses thicker panels and his fins are a thicker foil and have good drive & projection.  As far as this applies to your fin, I would sugest that you add glass to the base area, refoil & then have your test rider try it out again.  The base appears to be wide enough already, so I would suggest that you go with what you have.  A nice looking fin overall tho....  just my 2c.

Well, thank you to all that replied.  This is exactly the help I was hoping to receive.  

Loaded question…What  is an ideal thickness for foil on a fin like this one?

No Way!!!

 

The search thingy does work… http://www2.swaylocks.com/forums/whats-correct-fin-thickness

Im enjoying all these threads

Great reading/info
Thanku to those that share

I always use google te search in swaylocks.

Try the following in google:

site:swaylocks.com fin foil