Yes they do trap air and run differently going in or out of the wind. If
it's your first tunnel you got a long leaning curve to be safe. It took me
almost all summer before I got the hang of my STV tunnel


Check out www.stvowners.com and www.screamandfly.com


"Bob La Londe" wrote in message
...
Just picked up a 20' Baker tunnel hull with a 200HP Mariner. It ran
great.
I imagine when I get used to setting the jack plate just right and
trimming
the engine perfect I'll probably be able to run close to 80 with it.
Maybe
a little quicker with a different prop.

Anyway, I noticed something intersiting. Going away from the wind it ran
flat and quick, but running into the wind it tended to porpoise a little.
I
had to trim it down a little to prevent that. Now for the question. Do
tunnel hulls trap air and porpoise?

I noticed it didn't seem to do it as much at higher speeds either.

--
Bob La Londe
Yuma, Az
http://yumabassman.4t.com