Rick Cesati
Well-Known Member
- Joined
- Nov 28, 2003
- Messages
- 299
Gentlemen,
For some time, I have been battling what I feel like is too much lift in my 21 mono. The reason I think this is becuase my racing partner and I have the identical boats (4 strake microburst) setup with idenitcal hardware and fuel tank location. CGs are very close as well, the only major difference is in the motor, I run a NR, he runs a MAC. Props are intercangable on the boats as well (X437/3). Several months ago, we noticed the boats have different dead rise angles, his is significantly steeper than mine (an earlier generation boat) and consequently has a small freeboard. I cannot remember the angles right now.
Not surprisingly, his boat behaves better in rough water, but the real difference is the point at which the hull blows off. His will run hard well into the mid 50s in true race water, while mine will readily blow off before it reaches 50 mph. I have tried repeatedly to correct the problem including three different sets of tabs and myriad CG locations. I will admit to being stubborn about adding weight to the boat or angle to the strut, although I have tried to raise the strut to settle the boat will little to no affect. Perhaps my CG should be further forward than his? Will changing to a mutliple tank setup help when this is established in order to stabilze the CG? What about the CA trick on the hull bottom?
Thoughts, comments and suggestions welcome as I am trying to expand my mono knowledge.
Rick
For some time, I have been battling what I feel like is too much lift in my 21 mono. The reason I think this is becuase my racing partner and I have the identical boats (4 strake microburst) setup with idenitcal hardware and fuel tank location. CGs are very close as well, the only major difference is in the motor, I run a NR, he runs a MAC. Props are intercangable on the boats as well (X437/3). Several months ago, we noticed the boats have different dead rise angles, his is significantly steeper than mine (an earlier generation boat) and consequently has a small freeboard. I cannot remember the angles right now.
Not surprisingly, his boat behaves better in rough water, but the real difference is the point at which the hull blows off. His will run hard well into the mid 50s in true race water, while mine will readily blow off before it reaches 50 mph. I have tried repeatedly to correct the problem including three different sets of tabs and myriad CG locations. I will admit to being stubborn about adding weight to the boat or angle to the strut, although I have tried to raise the strut to settle the boat will little to no affect. Perhaps my CG should be further forward than his? Will changing to a mutliple tank setup help when this is established in order to stabilze the CG? What about the CA trick on the hull bottom?
Thoughts, comments and suggestions welcome as I am trying to expand my mono knowledge.
Rick