turn fin adjustment

[Eggy]

The speeds i posted may be fooling you. Note that i gained about 1.5Mph after removing the fins. But i'm also only doing mid-High 30's, the drag coused by the fins would be greater as the speed increases.

As the speed doubles the force quadruples the drag, this is in air, not sure how it is in water but as the drag is greater in water it may even be more.

[Christaphason]

Just to post my experience with messing with the turn fins

I angled my turn fins in, without shortening them, The boat seemed VERY stable like this, my fastest run with them was 38.5mph.

When i removed the turn fins, the boat seemed to be able to turn much sharper, but was very wild and wanted to dance at higher speeds. My fastest run with no turn fins was 38.9mph, but my battery power was dwindling at this point, so i will have to try with full charged batteries.

I am using fullers hardware on my boat, just to clarify.

[obrien]

back when I had my black jack, I simply cut 1" off of the fins. It didn't really make a difference in speed with the cut shorter and sharped nicely. My boat ran 45 mph with the stock motor and 53 mph with an ammo 2300 on 12 cells. I did remove the stock drive adding a strut and offset rudder.

[krusty]

very cool ! you ran some great numbers I hope I can join you in the 50 mph club soon!