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AIRCRAFT GEARBOX
- Thread starter Tony480
- Start date
Daddy Dave
Well-known member
I'm anxiously awaiting a reply on the question of availability of a Rotator reduction gear for a Lycoming 0-540. I still wonder about heat build up on the center jugs when RPMs are raised above the factory spec. of 2,750.
I would sure like to reduce to reduce that DD prop tip sound.
I would sure like to reduce to reduce that DD prop tip sound.
Daddy Dave
Well-known member
As I understood the earlier discussion, Waterthunder suggested it would be best to turn the engine up more to get the gear reduction to produce the most efficient RPM of the new quiet wide blade lower RPM props. Maybe I missed the point, though.
cowboy
Moderator
Bigdaddy,
Call these dudes, they make the adaptors:
KeeMc Inc "Keener Engine Machine"
WPB, FL
561-686-6134
Ask for Martin, Abner, or Dave.
The rotators they have are 1.53 ratio last I knew.
They are quieter, and run regular gear oil now. No more 200w stuff.
I bet those superwides behind an a/c geardrive would be awesome!
Call these dudes, they make the adaptors:
KeeMc Inc "Keener Engine Machine"
WPB, FL
561-686-6134
Ask for Martin, Abner, or Dave.
The rotators they have are 1.53 ratio last I knew.
They are quieter, and run regular gear oil now. No more 200w stuff.
I bet those superwides behind an a/c geardrive would be awesome!
cowboy
Moderator
You know Airag, I was telling Brewster the other day that I need to hook up with those Keener boy's and see what they are up to now.
It's was April last time I spoke with them, so there just ain't no telling what all they are up to with the latest gadgetry. I do know they have been very very busy retrofitting geardrives to A/C rigs.
When I last spoke with Abner, he mentioned that they had discussed with panther a "diet" rotator. Newer case design, reduced gear thickneses, ext. I really don't know if panther is gonna do it, but they just might.
They worked with panther for the custom ratio gearsets, and refinements to the rotator design for the shafting, and support bearings. Those refinements resulted in a free wheeling box, that makes almost no noise, runs with regular gear oil now, and don't hardly get hot. All that means more HP on the prop flange.
All the New rotators are supposed to have these refinements, regardless of ratio.
Those rotators are heavy duty, and they turn the opposite direction from the factory aircraft gearboxes. This cancells out the torque roll on strong A/C boats, and opens up the entire range of RHR automotive blade styles to choose from.
Personally I would have no problem with the idea of a standard rotator behind any of our 4cyl rigs, but I probably won't do that to them. then again.... never say never.
We do have a bigger Kline here, and it's got a plane jane 220gpu on it.
Thats the one we may geardrive one day.
It's my old man's boat, and I now he'd love to see that!
I bet your boat would be an animal with a hotrodded 4 cyl gpu, geared, and a big, big prop compared to what your swinging now.
Your engine will have to move forward 14" from where it's at now.
The rotators will allow you crank centerline to be lowered also, by about 6" I think.
Like thunder says, multiply your torque. Run more pitch, not more RPM's.
He's right. That's really the way to go, no matter what type of engine you run.
Downside?
For me that would be so much thrust at idle, that you had better plan well ahead when docking at a boat ramp or such.
I can learn to live with that. :twisted:
Sorry for Hi-jacking another topic y'all.
Oh yeah...
Bigdaddy started it!
It's was April last time I spoke with them, so there just ain't no telling what all they are up to with the latest gadgetry. I do know they have been very very busy retrofitting geardrives to A/C rigs.
When I last spoke with Abner, he mentioned that they had discussed with panther a "diet" rotator. Newer case design, reduced gear thickneses, ext. I really don't know if panther is gonna do it, but they just might.
They worked with panther for the custom ratio gearsets, and refinements to the rotator design for the shafting, and support bearings. Those refinements resulted in a free wheeling box, that makes almost no noise, runs with regular gear oil now, and don't hardly get hot. All that means more HP on the prop flange.
All the New rotators are supposed to have these refinements, regardless of ratio.
Those rotators are heavy duty, and they turn the opposite direction from the factory aircraft gearboxes. This cancells out the torque roll on strong A/C boats, and opens up the entire range of RHR automotive blade styles to choose from.
Personally I would have no problem with the idea of a standard rotator behind any of our 4cyl rigs, but I probably won't do that to them. then again.... never say never.
We do have a bigger Kline here, and it's got a plane jane 220gpu on it.
Thats the one we may geardrive one day.
It's my old man's boat, and I now he'd love to see that!
I bet your boat would be an animal with a hotrodded 4 cyl gpu, geared, and a big, big prop compared to what your swinging now.
Your engine will have to move forward 14" from where it's at now.
The rotators will allow you crank centerline to be lowered also, by about 6" I think.
Like thunder says, multiply your torque. Run more pitch, not more RPM's.
He's right. That's really the way to go, no matter what type of engine you run.
Downside?
For me that would be so much thrust at idle, that you had better plan well ahead when docking at a boat ramp or such.
I can learn to live with that. :twisted:
Sorry for Hi-jacking another topic y'all.
Oh yeah...
Bigdaddy started it!
Daddy Dave
Well-known member
You would also have to relearn shootin' lead. Frog giggin'and gator stickin' would have to be done on the "fly" it would seem.
Even with my PowerShift Signature, the boat is moving pretty good at idle. I'll bet them air gobblers would have quite an idle speed. It would seem this setup could have potential great advantages in range and on a heavier rig - like the one I run.
But, the future is in slow propeller speeds and I'm anxious to get started. The 14" forward engine movement is going to take some study. My rear seat currently sits over my mags.
Cowboy, these guys are the ones that retrofitted the GPU in your earlier magazine article, right?
Even with my PowerShift Signature, the boat is moving pretty good at idle. I'll bet them air gobblers would have quite an idle speed. It would seem this setup could have potential great advantages in range and on a heavier rig - like the one I run.
But, the future is in slow propeller speeds and I'm anxious to get started. The 14" forward engine movement is going to take some study. My rear seat currently sits over my mags.
Cowboy, these guys are the ones that retrofitted the GPU in your earlier magazine article, right?
cowboy
Moderator
10-4. They are the ones.
1650 to 1750 on those barndoor blades.
Should fit right in there pretty close on the A/C application.
Big question is "how many blades"
I'd think with the additional efficiency expected, such an upgrade may pay for itself quickly with high fuel prices, on a boat that gets operated with high frequency.
1650 to 1750 on those barndoor blades.
Should fit right in there pretty close on the A/C application.
Big question is "how many blades"
I'd think with the additional efficiency expected, such an upgrade may pay for itself quickly with high fuel prices, on a boat that gets operated with high frequency.
Waterthunder
Well-known member
If you aircraft guy's start running gearboxs you will see why us car motor guy's run only 13ft and bigger hulls. Your right about idle speeds when I pitch my prop for a long day of riding I must turn off my motor at least 60ft from a dock so I don't hit it at ramming speed.
Thunder, Sprag clutches don't take up much room and they're almost completely trouble free.
We had them many years ago in helicopters, at the end of the driveshaft between the turbine engine and the main transmission so that if the engine ever siezed up, the rotor head would keep turning.
Talk to your buddies in the gearbox business and see what could be done about putting a sprag clutch in a gearbox. You could idle in and the prop would nearly stop ..... if you were a little short of the dock, a little blip of the throttle and then right back down to idle.
If one was set-up right, you might even be able to idle without pushin the boat.
olf
We had them many years ago in helicopters, at the end of the driveshaft between the turbine engine and the main transmission so that if the engine ever siezed up, the rotor head would keep turning.
Talk to your buddies in the gearbox business and see what could be done about putting a sprag clutch in a gearbox. You could idle in and the prop would nearly stop ..... if you were a little short of the dock, a little blip of the throttle and then right back down to idle.
If one was set-up right, you might even be able to idle without pushin the boat.
olf
A
Anonymous
Guest
Hello, I waited several months on Carlton and gave up. Air Tech 321-264-4744 will build and weld a flange on. They also make flywheels, starters and alternators. They do topshelf work and the gear is still doing great. God Luck Mitch
A
Anonymous
Guest
A while back they charged $500 for a flange installation, and it took them about a month, but they were in the learning phase. They manufacture the flange and cut down the spline shaft of the gear. Instead of taking the gear apart they install a cooling radiator inside the shaft while the flange is welded on. They also sell a flywheel, starter and alternator kit but I don't know what they charge for that.