http://www.ebay.com.au/itm/4-pcs-1-75-fins-kiteboard-kitesurfing-kiteboarding-/200671345104?pt=AU_Sport_Surfing&hash=item2eb8f1b9d0

Has anybody got any experience with these fins. Are they cheap and nasty?, or just cheap?. would I be wasting my money buying these?

Have used polycarb fins in the past and they are ok for a cheap set of fins but best buy an extra set as they can snap off easily in the shallows.

bennie said...

I've done a bit of research on fins. It turns out that polycarbonate fins will flex and vibrate under stress. You learn something everyday. So g10 fins it is!

Was that surfboard fins you found that about?
They are obviously a lot longer than twin tip fins.

It is hard to imagine something that is only 50mm high flexing to much to cause an issue that you would even notice on a twin tip!

I have used polycarbonate fins before without any problems (though they were only about 40mm high). Polycarb is quiet tough, you would have to be trying hard to break them. Although I'm not sure what range of 'grades' of polycarb are available. The fins I used were cut from a sheet of Lexan (brand name).

One thing I noticed; fins seem to be more rigid on the board if the surface that contacts the board is slightly more concave than the board.
That way, as the screws are tightened the 'tips' of the fin contact the board first, followed by the 'body' of the fin.
I have seen fins with a flat base that have a slight gap between the tip of the fin and the board even when the screws are tight. This leaves the tip of the fin free to flex a little. Hope this makes sense...

quick layer of glass over the top

bennie said...

http://www.ebay.com.au/itm/4-pcs-1-75-fins-kiteboard-kitesurfing-kiteboarding-/200671345104?pt=AU_Sport_Surfing&hash=item2eb8f1b9d0

Has anybody got any experience with these fins. Are they cheap and nasty?, or just cheap?. would I be wasting my money buying these?

I have used these before and have nothing nice to say about them a complete waste of money! they snap, they fall off and they are super easy to over tighten the screw and strip the thread out.

G10 all the way!