Winged or bulb keel slower!
Is Robbie's boat rated too fast?
Are there two ratings for the 35s5 depending on keel?
Think not!
Is Robbie's PHRF too low?
Read on:
http://www.irc-class.com/min41001.html
3) To decrease the penalty for Keel with Bulb. Considering that a keel
with bulb is a keel that inferior part is wider than upper part. In this
case RANC studied the two versions of First 35S5 (depending on the keel):
Lead deep single keel with draft 1.9 metres and fusing Iron keel with draft
1.8 metres. RANC found that Lead Simple Keel was in advantage. In other
words.lead simple keel was more advantageous. Everybody knows that the Lead
simple keel version is faster than Bulb Iron Keel so we can not give them
facilities to win giving them a "bonus".