counter rotating props?

G

garbubba

Junior Member
I'm still searching for a motor for my '87 cuddy. Want a carb yammie, but since I have merc controls I'd settle for a 150 merc. I've seen a few deals with a pair of counter rotating props & it got me thinking.

If you had only one engine, why would it matter which way the prop spins? It would just torque in the opposite direction, right?

And then why are counter rotating engine generally cheaper? & prop's too?

Doug
 
garbubba said:
I'm still searching for a motor for my '87 cuddy. Want a carb yammie, but since I have merc controls I'd settle for a 150 merc. I've seen a few deals with a pair of counter rotating props & it got me thinking.

If you had only one engine, why would it matter which way the prop spins? It would just torque in the opposite direction, right?

And then why are counter rotating engine generally cheaper? & prop's too?

Doug
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Supply and demand basically. Not a lot of boats use twin engines, so when someone repowers or blows an engine the regular rotating engine sells easier than the counter rotating one.. so there are simply more used counter rotating engines available than the demand for them.. which equals a lower price as the owner trys to sell it.

Additionally, I think I recall reading that counter rotating engines are not as reliable as regular rotating engines? Now I could be wrong about that, so don't hold my feet to the fire over it... I just seem to recall reading about it somewhere....probably here. :head:
 
I have a opposite spin 200hp Merc on my V 20 and it has over 1,200 hrs on it and the only so far I've had to replace was a low pressure fuel pmp.
 
Destroyer said:
Additionally, I think I recall reading that counter rotating engines are not as reliable as regular rotating engines? Now I could be wrong about that, so don't hold my feet to the fire over it... I just seem to recall reading about it somewhere....probably here. :head:
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no feet to fire here lol.. but please explain how that is even possible?? The only difference is reverse gears in the gearcase, you could make a counter rotator by simply changing the gearcase, so that means if you change the gearcase on reg rotation motor it now becomes less reliable?

I know you were just quoting, but I had to say something about it!! lol
 
Do a search for counter rotating engine here, and go to this thread: any issues running a counter rotating engine for a single engine use? You'll see where I got my thoughts from.:head:
 
counter rotating

Thanks,

I'll go to that thread & look, but as has been stated it's just the foot that's different.

I've run many twins but on boats at work, I couldn't afford the boat, engines or fuel!

I was just thinking I could buy a pair, use one & sell the other & if the RH engine would bring more $$ why not use the LH engine?

Thanks,

Doug
 
same motors just different foot i have a couple boats with twin currently but the counter unit is not as strong of a gear set but you can run one till the foot craps out then just buy a standard foot to replace it. the counter props are higher though.
 
how ya like this set of matched twins on my wellcraft 250

Picture068.jpg


Picture080.jpg


Picture070.jpg
 
Skools Out said:
how ya like this set of matched twins on my wellcraft 250

Picture068.jpg


Picture080.jpg


Picture070.jpg
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LOL Skools, your skills never fail to amaze me. I saw these pics in the other post, but I'm thinking that paint would be a great idea. Make the blue one white or the white one blue... Given the colors of your boat, I'd go with the Johnson color scheme. But in all cases, that's an awesome setup. :clap:
 
for right now i'm going to remove the cowlings and paint both the legs and foot on them white then put one set of Johnson the other Evinrude set boat till i decide to sell then it will get 2 johnson cowlings lol
 
If you have a single prop in the northern hemisphire it should spin counter clockwise to reduce counterturbulance caused by the coriolis forces. That of course can be overcome by installing a simple disfossilator compensator on the hyperaquanation bracket.

rkc
 
Of course

Road King Cole said:
If you have a single prop in the northern hemisphire it should spin counter clockwise to reduce counterturbulance caused by the coriolis forces. That of course can be overcome by installing a simple disfossilator compensator on the hyperaquanation bracket.

rkc
Click to expand...

Of course, now I get it, it's all so simple now!
 
Road King Cole said:
If you have a single prop in the northern hemisphire it should spin counter clockwise to reduce counterturbulance caused by the coriolis forces. That of course can be overcome by installing a simple disfossilator compensator on the hyperaquanation bracket.

rkc
Click to expand...

Allow me to return the compliment RKC.... "What Road King Cole said".....







And that is, of course if you're living in the Northern Hemisphire. If you are in the Southern hemisphire you have to turn the disfossilator compensator on the hyperaquanation bracket 180 degrees due to the earth's magnetic fields. It's the same principal as the water in the toilet swirling one way in the north and the opposite way in the south. :head:
 
What the heck, for all that, keep the dam thing simple and install an iperfornicator trobolis on the upper anobolitros.:beer:
 
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