Crossflow vs. Looper

[THEFERMANATOR]

Originally Posted by Skools Out

well you can't base a hull on HP the hull design will only go so fast you could put twin 300's on a boat and it still run the same as the same hull with a single 250. all is based on hull design

Yep, but my hull with the 125 FORCE it origanally had would only pull off 35-38 with a light load on a good day. I can consistently pull off high 40's with my current prop with all sorts of loads(propped it down to keep from getting up to the uncontrollable speeds).

[Skools Out]

no i was saying all hulls have a top speed an once they reach their top speed you can add all you want but that's all the hull will go. now they may be faster than we want to go but they all have a top speed

[THEFERMANATOR]

I was just pointing out that these old loopers can RUN when they're right. Many people right off the JOHNNY-RUDES and say they're slow, but I've talked to many people and found that the small-bore loopers will get it, but there hard to get them right.

[Skools Out]

yeah you are better with a big bore looper same HP but were much better motors.

[THEFERMANATOR]

I fought my 85 for almost 2 years before I got it right. The previous owner gave up on it when he couldn't get it right. Ended up going with a set of early 87 carbs and running the timing at 19 degrees. Jetted the mains up 2 sizes and played with the idle and mid-range air bleeds to keep it from loading up and stalling on accel. It runs like a scalded dog now, but when I first got it it was a train wreck.

[randlemanboater]

Now there is some good info. Thanks guys for shedding light on all this.

Speaking of 1968 55hp omc's, thats what I learned to waterski behind when I was a kid. That motor would scream, 23 mph on a 14 ft Westwind!!!!

Ah the good old days.

[brianct12]

Randle,
I also learned to waterski ... pulled by a '69 era 55hp 3cyl with the electric, push-button shift. Brings back good memories. I seem to remember that motor (on an 18' fiberglass) pulling a skier at 25 mph.

[Airslot]

I learned to ski behind a 15' Cacicraft trihull with a 1970ish 60hp evinrude with the pushbutton electric shift. There was also an old wooden 15'er with a white merc, but I don't know any specs on the merc.

Airslot

[brianct12]

Hey Skools,
I'd enjoy learning more about a hulls top speed limitation. * I can understand there exists "a law of diminishing returns" ..... where you keep adding horsepower and not getting as much mph in return. * But I cant imagine a hull has a finite limit. *If I strap a 5000 lb thrust jet engine onto a V20 (assuming that was possible) ... its gotta move faster than one with a 250hp (or 2 250hp) outboards on it. *No ? *

[Skools Out]

lol yeah little different story there, at that point you most likely will join the Darwin Club lol. The coast guard buys 18ft Parkers with twin 300's on them to make you scared i guess cause the engineer said they are 3 mph slower than the same boat with a single 250 lol.