left or right why?
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Category: General Correct Craft Discussion
Forum Name: General Discussion
Forum Discription: Anything Correct Craft
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=4923
Printed Date: May-14-2024 at 9:06pm
Topic: left or right why?
Posted By: p/allen
Subject: left or right why?
Date Posted: October-04-2006 at 10:57pm
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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 ------------- Pat http://i175.photobucket.com/albums/w146/72ccfan/100_5977-1.jpg - My 72 Skier Rock River Dixon,ILL. |
Replies:
Posted By: greenpinky
Date Posted: October-04-2006 at 11:00pm
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I'll tell you if you post a pic of your girlfriend for us. ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=1406&sort=&pagenum=1&yrstart=1976&yrend=1980 |
Posted By: 62 wood
Date Posted: October-05-2006 at 12:00am
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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? ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=1117&sort=&pagenum=6" rel="nofollow - 64 American Skier 62 Classic.. 73 Ski Nautique |
Posted By: The Lake
Date Posted: October-05-2006 at 12:06am
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Steve,
Did you get back in the water yet, or are you dry docked until spring? Pat, I'm sticking with the engine torque offsetting driver weight. Chuck ------------- Walk on Water www.coldwater.me http://correctcraftfan.com/diaries/details.asp?ID=775&sort=&pagenum=3&yrstart=1966&yrend=1970 - 69 Ski Nautique |
Posted By: 62 wood
Date Posted: October-05-2006 at 12:13am
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.. ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=1117&sort=&pagenum=6" rel="nofollow - 64 American Skier 62 Classic.. 73 Ski Nautique |
The Lake wrote:Posted By: jimbo
Date Posted: October-05-2006 at 1:42am
| The best explaination I've heard was to make it more difficult for people to use automotive parts. |
Posted By: Mojoman
Date Posted: October-05-2006 at 7:42am
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' |
Posted By: eric lavine
Date Posted: October-05-2006 at 7:44am
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some of the reason i think, was to obtain counter rotating props on the twin screws, nowadays you have whats called full power forward and full power reverse transmissions. in which the engines now spin the same rotation and going thru the trans you can get your counter rotation on one and counter clockwise on the other. you never see counter rotating engines in twin screw boats anymore, i think ccw were in abundance at one time, and maybe it does have something to do with the torque of the boat. but all in all i think they designed the ccw engines more for the twin screw boats not for the torque issue on corect crafts or any other single screw boat ------------- "the things you own will start to own you" |
Posted By: 79nautique
Date Posted: October-05-2006 at 8:06am
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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" ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=756&sort=&pagenum=1&yrstart=1979&yrend=1979 - 79 nautique |
Posted By: eric lavine
Date Posted: October-05-2006 at 9:17am
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79 i think so to, because when it comes down to anything in this country it is always about the bottem line, they try to label items like pcm, crusader, mercruiser and people are fooled to believe that you have to go to that brand name to but your parts, it kills me especially with the volvo stuff, good marketing eric ------------- "the things you own will start to own you" |
Posted By: David F
Date Posted: October-05-2006 at 9:36am
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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. ------------- |
Posted By: eric lavine
Date Posted: October-05-2006 at 10:29am
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there is no way cc went to an engine manufacturer and said build us counter rotating engines, it just happened that they did for the marine industry and correct craft found out that they worked well in the boats. what if back in the day ford or pcm approached cc and said hey we have a surplus of 1000 of these engines we'll give them to you for half of what your paying..... just speculating and it so happens they perform better in single screw boats because of the torque ------------- "the things you own will start to own you" |
Posted By: 75 Tique
Date Posted: October-05-2006 at 10:34am
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http://www.correctcraftfan.com/forum/forum_posts.asp?TID=4293&KW=left+hand - in case you missed it the last time
This does come up periodically. ------------- _____________ “So, how was your weekend?” “Well, let me see…sun burn, stiff neck, screwed up back, assorted aches and pains….yup, my weekend was great, thanks for asking.” |
Posted By: 79nautique
Date Posted: October-05-2006 at 11:35am
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they did it because they wanted too and could. ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=756&sort=&pagenum=1&yrstart=1979&yrend=1979 - 79 nautique |
Posted By: GottaSki
Date Posted: October-05-2006 at 11:45am
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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. ------------- "There is nothing, absolutely nothing, half so much worthwhile as messing around with boats...simply messing." River Rat to Mole |
Posted By: David F
Date Posted: October-05-2006 at 11:58am
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All the theory's are plausible. I even like Chris' theory the best. However, in some states such as my state (TX) observers are not required. So skiing with just the driver is often the case.
What I noticed with my '77 Martinique with a non-standard LH engine and LH prop was that the boat rolled significantly to Starboard when making Starboard turns. Sure, the weight of the driver contributed significantly to this behavior, but I have to believe that a RH prop would help counteract this tendency. Consequently, I usually turned port unless forced to turn Starboard. ------------- |
Posted By: Hollywood
Date Posted: October-05-2006 at 12:02pm
I think that was part of the idea, HELP not necessarily eliminate. ------------- |
Posted By: M3Fan
Date Posted: October-05-2006 at 12:28pm
| FWIW, I was pulling a skier without an observer the other day (don't tell), and the boat did drive completely differently. Actually wandered a little bit in the course, which was weird since it is typically on rails. |
Posted By: Hollywood
Date Posted: October-05-2006 at 1:21pm
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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. ------------- |
Posted By: eric lavine
Date Posted: October-05-2006 at 1:29pm
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what rotation do you use in Australia where the water goes down the drain the opposite of here??
79 said it right but..... if it cost correct craft more to do it, it wouldnt have been done ------------- "the things you own will start to own you" |
Posted By: JoeinNY
Date Posted: October-05-2006 at 2:28pm
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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... ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=1477 - 1983 Ski Nautique 2001 1967 Mustang 302 "Decoy" http://www.youtube.com/watch?v=cO5MkcBXBBs - Holeshot Video |
Posted By: 75 Tique
Date Posted: October-05-2006 at 2:29pm
When I bought my Tique, after thorough inspection and a lengthy test drive, I didn't realize, until I saw the PO approach my trailer at the ramp, just how small the Tiques are. He towered over the windshield and the boat had a significant starboard list. Were it not for my lovely wife and two kids, I would say boat buns would almost be a necessity for achieving a proper ride. ------------- _____________ “So, how was your weekend?” “Well, let me see…sun burn, stiff neck, screwed up back, assorted aches and pains….yup, my weekend was great, thanks for asking.” |
Posted By: eric lavine
Date Posted: October-05-2006 at 5:20pm
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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.
------------- "the things you own will start to own you" |
Posted By: 62 wood
Date Posted: October-05-2006 at 7:59pm
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Eric,
As for a marketing tool, Its not just "vintage" Correct Crafts that did this(run RH props).. Chris Crafts were famous for running their motors "flywheel forward" to obtain the RH prop rotation. Ive got a friend with a Century inboard this way also. "Older" Mastercrafts (70s-80s) as well as my wooden Higgins run reverse rotation,flywheel aft engines.. Soooo, back to the original question..
Im still confused...which is easy to do  ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=1117&sort=&pagenum=6" rel="nofollow - 64 American Skier 62 Classic.. 73 Ski Nautique |
Posted By: eric lavine
Date Posted: October-05-2006 at 8:55pm
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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 ------------- "the things you own will start to own you" |