Mercury CNC props Bblades MRI scan
#12
Registered
Join Date: Aug 2012
Location: Collierville, TN and Pickwick Lake
Posts: 2,291
Received 395 Likes
on
165 Posts
One drive is chain driven, the other is gear driven (to change rotation). The gear drive box is less efficient than the chain drive and will extract more power but I wouldn't think it would 15%. Do you know which side the gear drive box is on?
#14
I believe the ZF 280's are gear only. Basically one is in reverse and one in forward. Typical three shaft transmission with an input, a lay, and output shaft. The side that's down on RPM is the one that has more gear contact to rotate same as the motor. I can't imagine it's 15% though.
#15
Registered
Join Date: Aug 2012
Location: Collierville, TN and Pickwick Lake
Posts: 2,291
Received 395 Likes
on
165 Posts
I believe the ZF 280's are gear only. Basically one is in reverse and one in forward. Typical three shaft transmission with an input, a lay, and output shaft. The side that's down on RPM is the one that has more gear contact to rotate same as the motor. I can't imagine it's 15% though.
What horsepower are you making?
#16
Registered
Join Date: Aug 2012
Location: Collierville, TN and Pickwick Lake
Posts: 2,291
Received 395 Likes
on
165 Posts
Hold on, let’s back up a bit......
I am talking about the ASD8 drives, not the transmissions.
So are you saying the counter rotation is accomplished in the transmissions rather than the drives?
I am not well versed on the ASD8 but assumed it was similar to the ASD7 which uses gears to reverse rotation on one drive and a chain/sprocket combo on the other drive.
I am talking about the ASD8 drives, not the transmissions.
So are you saying the counter rotation is accomplished in the transmissions rather than the drives?
I am not well versed on the ASD8 but assumed it was similar to the ASD7 which uses gears to reverse rotation on one drive and a chain/sprocket combo on the other drive.
#17
They are the 480HP 950TQ rated motors. I just had the the first 250 hour service done on them. We checked the valve lash and injectors, and a few other things. I'm really leaning towards the props, it makes the most sense. My only experience with surface drives is with RC boats. I do know that a very small change in prop makes a huge difference. Granted, that probably not the best comparison.
#18
Hold on, let’s back up a bit......
I am talking about the ASD8 drives, not the transmissions.
So are you saying the counter rotation is accomplished in the transmissions rather than the drives?
I am not well versed on the ASD8 but assumed it was similar to the ASD7 which uses gears to reverse rotation on one drive and a chain/sprocket combo on the other drive.
I am talking about the ASD8 drives, not the transmissions.
So are you saying the counter rotation is accomplished in the transmissions rather than the drives?
I am not well versed on the ASD8 but assumed it was similar to the ASD7 which uses gears to reverse rotation on one drive and a chain/sprocket combo on the other drive.
#19
Registered
Join Date: Aug 2012
Location: Collierville, TN and Pickwick Lake
Posts: 2,291
Received 395 Likes
on
165 Posts
Ok, well excuse my ignorance and I learned something here.
If you have #6 props I have a spare set if you’d like to try them.
They are considerably smaller than what you are running though.
If you have #6 props I have a spare set if you’d like to try them.
They are considerably smaller than what you are running though.