Newbie is building a river cruiser.....

The Thai use automobile engine(self modifided) with a long shaft , created a very high disturbing noise. The Rest of the Asia use YAMAHA, HONDA and various Japaness brand with engine size min 3HP to 24 HP marine engine (factory item).

I hope this help.

 

A long time ago there was an APBA class racing boat. If I remember rightly it was called C-Racing runabout. There was a very creditable builder of racing boats, named Jacoby. He made sort of wedge shaped boats for that class. The thing is that Jacoby knew his business and had many years experience building race boats. He had worked out the details quite admirably.

In my youthful ardor I was going to improve his boat. After all at the age of 18, I knew everthing. I built my improved model in wedge shape and on its' first trial run I flipped the boat. More correctly it flipped me. On the second and third try the results were the same. It seems that the "thing" behaved something like a three wheeler ATV. They are bad about flipping the rider over the handle bars. My boat would go like hell in a straight line but any hint of a turn made it acrobatic, and up side down as it attempted to drown me and destroy the engine which had inhaled 500ccs. of water, bent the rods, shucked the flywheel and so on. The boat ended up as a campfire and my previously supposed superior intelligence got a serious dose of humility.

Experiences like that one made me a seeker of legitimate knowledge, a book reader, and lately, an interested and respectful member of this forum. I can, at this late date, be described as one of those GEEZERS. I dont know much about how to design the ultimate boat but I do know how not to design a boat.

 

Great story, an education is an expensive thing - the old saying goes.

I don't know if this is the exact boat, but it sure is sexy.

http://www.glen-l.com/designs/outboard/classcd.html


Was the front of the boat digging in and plowing, or was the planing angle too great causing the bow to come up and get airborn?

Or both?

 

Kach22i:

Your thumbnail looks about like the Jacoby. This one is maybe a little bit wider at the transom. The Jacoby had simple, beveled. non trip chines that were very large, particularly at the transom. My genius boat reduced the width of the non trips and widened the bottom somewhat. The premise was that the bottom could be made wider (at the expense of the non trip width) and presumabbly reduce the pressure per unit area. The boat tripped in a sort of diagonal pitchpole and would stick its fabric covered fore deck into the water. Thrilling ! Dangerous too.

I'm sorry this guy is so sensitive. What he does not know is that most of us ahave no intention of raining on his parade, we just want to be helpful. This episode reminds me of an old girl friend that once told me; "if you dont want to hear the answer then don't ask the question"

 

A couple of bow foils would of took care of that as proposed in another thread, but then you would of been disqualified from racing.

From LP in thread:
http://www.boatdesign.net/forums/showthread.php?t=16139

Picture:
http://www.boatdesign.net/forums/attachment.php?attachmentid=11793&d=1172682560

 

"The boat ended up as a campfire and my previously supposed superior intelligence got a serious dose of humility.
Experiences like that one made me a seeker of legitimate knowledge"

Messabout,

Your old girlfriend was wise, as are you. You weren't suffering from a lack of intelligence when you tried to improve on a raceboat design, only a lack of knowledge. That you recognized the experience as a lesson in humility proves that you are above average in "practical" intelligence. Many of us seem to have learned lessons the hard way. The lady in my life says, "You can't help your shortcomings, you're male ."

BTW, I'm near Sarasota. Pass near you every now and then on I4.

Cheers,

Charlie

 

UPDATE 03/26/2007

FYI:
Some interesting comments and solutions which mirror the old conversation in this thread;

link:
http://www.boatdesign.net/gallery/showphoto.php/photo/629/cat/500/ppuser/839

 

Sometimes online forum discussions seem to be like the ancient Romans described, "Nil noli sub sole" (nothing new under the sun)