left or right why?

I tried to explain the difference of a left and right hand rotation prop to my SMOKIN HOT BABE, then she stumped me with a question.
   Why is there a difference in left and right rotation? Why didnt they stick to one rotation?
I said wellllllllll. And that was it. I didnt have an answer .
She said , I bet you will find out .

     HELP!!!!!!!!!!!

Thanks Pat

Hey Pat!
You've re-opened an age old arguement.. Ive heard some explenations, but none to my total satisfaction.

In twin engine boats, it makes perfect sense to have opposite rotating props.

But in single engine inboards, one of the things Ive been told was the engine torque would offset the weight of the driver. If this was the fact, then why do they still run "backwards" engines in LH (like a car)controlled boats? (my Higgins, as well as some vintage CCs did this)


Oh well, here we go again! ... btw, you get your heads off your skier yet?

The Lake wrote: Steve, Did you get back in the water yet, or are you dry docked until spring? Chuck

Chuck..had it in the water once for about 10 mins...but was a "band-aid fix".. No boating here til spring.. ..
    may email you..

Pat, While I'm glad to see that you are having intellegent discussions with your "SHB" about motor rotation, next time, please make sure you have the answer to the question.. This way you will continue to keep our male ego's in tact. Or next time, just make something up fir gods sakes... hahaha...


Moj'

pat the simply answer is "that way they can sell more parts becuase it can only use RH parts if it was LH then they could buy anyone's parts and they would loose part sells"

I do not subscribe to the have to buy PCM or CC parts theory. I really think is has to do with prop torque. My belief is that CC wanted to minimize roll when turning starboard (drivers side). Sure, there were some boats with left hand drive, but maybe not many and CC had only RH engines to drop in.

I think with modern props, the torque is not as much of an issue as it was in days gone by, but now RH props are a CC trade mark of sort. Just my $.02.

in case you missed it the last time

This does come up periodically.

exactly

The theory it is to balance the weight of the driver doesn't hold water, because that infers that your finely tuned tournament ride immediately becomes unbalanced when one adds an observer. Might have applied in 1965, but not the last three decades.

David F wrote: I have to believe that a RH prop would help counteract this tendency.

I think that was part of the idea, HELP not necessarily eliminate.

When all my boat buns have left me for other men, I just move the boom, skylon and jumpseat to the port side and it rides *almost* level.

Rotation makes a big difference with the lean with one person in the boat. I finally got the chance to drive someone elses stock 2001 the other day and it basically drives level when I am in it, vs my boat with the std rot eng where I usually drive from the pa$$engers seat if I am in it alone.

Gottaski's debunking of the theory doesn't hold water.

"because that infers that your finely tuned tournament ride immediately becomes unbalanced when one adds an observer"

I don't buy it, by personal observation and by some math... Lets say the rotation of the prop imparts a moment equal to a 220 driver located in the drivers seat, the correct way is to have that moment counteracting the driver, then with the worse case where the driver and spotter are equal in weight you have a max 220 lbs of imbalance, add a third person and you can move them around and all is well so you never have more than one 220 imbalanance and the boat handles it well enough. If the motor rotates the "incorrect way" with the driver alone you get a 440 lb imbalance, throw in a best case of an equal weight spotter and you can get that down to and acceptable 220, but what you usually have is a 100 lb spotter and a 320 lb imbalance and a pretty good lean. All this stuff becomes worse when you add the extra weight naturally on the drivers side of the helm, controls, gauges, stereo, amp, perfect pa$$ etc... all that helps you out if you rotate the correct way.

At 36 the lean isnt too noticeable, and at wakeboarding speeds you can put the phat sack in the right location to get her about level but believe me if I am riding around you cant see the ski nautique letters on the side of the boat sometimes the lean is so bad.

However going on a diet is probably cheaper than reversing the rotation of the motor...

we could beat this to death on why it is, CC may have used it as a great marketing tool against the other manufacturers and it may have helped them sell more boats, in the 60's they didnt have transmissions that you could spin either direction for forward, now every trans manufacturer has them eliminting counter rotation engines( except for cc which sticks with the borgs or the pcm's). Mastercrap uses the zf hurth 630a in which you can spin either direction full power forward. you could put a left or a right hand prop on it.which im pretty sure thier spinning righties.

alot of the old chris's ran twin screw's left and right hand engines with the paragon 1:1's mounted on the front of them (flywheel forward) which kills that theory so again did they do that for the single screw boat or the twin screw, im pretty sure these engine configurations were in place for twin screw boats which there are probably a ratio of lets say 50:1 to single screw boats. when it came to building a single screw boat they had a wide variety of packages to choose from all evolving from the twin screw. there are single screw boats with the helm on the port side which adds more to the mystery