What is the theortetical hull speed for a C-27?

[Mike]

What is the theortetical hull speed for a C-27?

 

[jchealey]

hull speed

The square root of the length of the waterline times 1.34

 

[ToyBox]

Or about 6 kts

I am not sure, but I have heard that pushing 6.5 kts is the max under power. I have also heard that C27 have gotten GPS reading of almost 10kt while surfing waves downwind.Chris D

 

[Joe Ford]

And the answer is.........

6.25 kts is "theoretical" hull speed.using jc's formula:LWL 21.75 ftsq root= 4.66 x 1.34 = 6.25Hey, that's what it also says in the C27 stat sheet. Cool. Now, why does my GPS often clock me at 6.5 or 7 kts? C'mon you engineers, help us out. (but keep it simple). Uh, thanks, I think.

 

[LaDonna Bubak - Planet Catalina]

Current?

That would be my guess as to why you get clocked going faster.At least that's my excuse for why mine goes so @#%$& slow!LaDonna

 

[Kevin McGrath]

C27 Hull speed

The Hull speed is approximately 1.4 times the square root of the length of the boat's waterline. when you heel, your waterline is longer and you can go faster. your speed is also affected by currents, which will increase or decrease your boatspeed.

 

[Dave Ullrich]

why you can excede hull speed

Any boat can excede hull speed with enough power. Hull speed simply indicated the speed at which the hull wants to try and ride over it's bow wake and start to plane. Even a full displacement hull can be forced over this speed, but the hull will start to vibrate at a very high freqency that we really can't hear or feel. Or atleast is how it was explained to be a while back.