Mixing fins and fin boxes

Mixing fins and fin boxes

Post by Jim Robins » Fri, 16 Apr 1993 01:24:21


It seems to be possible to put a fin designed for US depth Chinook boxes
into an European depth Chinook fin box. Is there any reason to not do
this? The reason I ask is that I now have a board w/ the latter fin box,
and I would like to use in it a fin that I had bought for the US depth
box. I tried putting said fin into the box and it *seemed* to fit
reasonably well. However, looks can be deceiving, hence the question.
--
Jim Robinson

{ubc-cs!van-bc,uunet}!mdivax1!robinson

 
 
 

Mixing fins and fin boxes

Post by Conrad Rimm » Sat, 17 Apr 1993 03:47:33

: It seems to be possible to put a fin designed for US depth Chinook boxes
: into an European depth Chinook fin box. Is there any reason to not do
: this? The reason I ask is that I now have a board w/ the latter fin box,
: and I would like to use in it a fin that I had bought for the US depth
: box. I tried putting said fin into the box and it *seemed* to fit
: reasonably well. However, looks can be deceiving, hence the question.
: --
: Jim Robinson

: {ubc-cs!van-bc,uunet}!mdivax1!robinson

Make sure that if you use the shallower fin in the deeper fin box, the
chord of the fin (widest part) does not press into the top of the
fin box and cause delam or some other damage.  

I have a Plane Air hollow board and the fin box is inset slightly
into the hull for extra strength.  I have to file off a small amount
of the fin so that it does not cause delam of the fiberglass layers
covering the fin box.

---
conrad


 
 
 

Mixing fins and fin boxes

Post by Tom Alber » Tue, 20 Apr 1993 10:47:42

Using an A-base fin in an E-base board puts stress on the side of the finbox
and can cause it to blow out.  It doesn't have the bottom of the box for
strength.

tom.