Tunnel sponson bottom ride angles

[drumzzzz]

does anyone know if a flatter bottom ride surface (closer to a rigger) affects stability, or turning response? Is there somewhat of a tradeoff of speed for stability?

 

[Grimracer]

We need to have a long talk...

Grim

 

[Jerry Dunlap]

"Short Talk" - Yeah, it does speed, stability, and cornering.

JD

 

[drumzzzz]

thanks for the info, I'm definitely a newbie to tunnel theory. In the straightaways, does a flatter surface create more of an aerodynamic doom - the higher speed potential creates more ground effect and it wants to go airborne?

IMHO the overall speed (and blowover tendency) contrast of outriggers and scale hydros (aside from weight) seemed to be influenced by the built in aerodynamics of the scales hydros. Flat sponson ride areas are typically similar between the too.

 

[lohring]

One of the big differences between the Lynx and previous tunnels is increased angle (dihedral) of the bottoms. This is a higher drag configuration, but with the power we now have available even in stock engines, this is not the most important factor. Finishing the race, in what amounts to ocean racing conditions for that small of a boat, is. This is also one of the differences between Seducers and earlier mono designs. Riggers are so stable that they can use the lower drag flat sponsons. Other styles of hulls are faster through rough water with a deeper v.

Lohring Miller

 

[drumzzzz]

I understand, especially due to the tremendous power to weight ratios, a little compromise of friction/speed for stability doesn't amount to much, especially if it makes the difference between finishing a race or not. The fastest boat doesn't always win comes to mind.

 

[drumzzzz]

We need to have a long talk...

Grim

Man, you can say that again! Seems alot of this info has been more than covered with Rod Geraghty and Tommy Lee- Bernouli effect, rocker,dihedral ect... my head is pounding :lol:

 

[james irwin]

"Short Talk" - Yeah, it does speed, stability, and cornering.

JD

hey jerry . You can have this one , To much to tell in shuch a short time .

how was the trip back home ??

 

[Jerry Dunlap]

Hi Jim,

We had a great time in D.C. and it's even greater to be back home.

JD