Rudder Length

[jeepers]

Hey guys whats a good rudder length for a sport 40 Whiplash? I have a Speed Master Sport 21 rudder from another project,I was thinking of using it on this boat but its way to long I think, any suggestions?

Thanks

Sean.

 

[NITROSNIFER]

My whip's blade length is 4". This does not include the clamp area just the blade. it's 0.922 at the top of the blade and 0.700 at the bottom.