Sanding a lower unit for speed
10-07-2012 | 10:06 AM
#21
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Joined: Jul 2007
Posts: 2,640
Likes: 14
From: MI
Might want to try veggie oil vs WD40...a little more enviro friendly.
10-07-2012 | 10:23 AM
#22
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Joined: Jul 2007
Posts: 3,648
Likes: 32
From: Oneida Lake NY
Interesting, most of us just keep adding HP
Curious to see if any DIY'ers on this site have trued a lower unit themselves.
10-07-2012 | 12:20 PM
#24
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Joined: Feb 2007
Posts: 2,839
Likes: 21
From: MID MI
http://www.proboat.com/blueprint-for-speed.html
Interesting, most of us just keep adding HP
Curious to see if any DIY'ers on this site have trued a lower unit themselves.
Interesting, most of us just keep adding HP
Curious to see if any DIY'ers on this site have trued a lower unit themselves.
10-07-2012 | 08:02 PM
#26
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Joined: Aug 2010
Posts: 2,535
Likes: 1
From: MA
10-08-2012 | 08:50 PM
#27
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Joined: May 2005
Posts: 409
Likes: 1
From: Florida
Having a true straight lower on a twin engine appllication is beneficial but i don't think this is the case on a single engine app.
Outboard drag racers have been sanding/profiling lower units for many, many years, and straight was not what they were after. Running a high x dim will result in increased speed but on a single it will try to prop walk. Prop walk will cause the driver to crab the lower to keep the boat in a straight line. Look at the skeg mounted torque tabs on the fastest of outboard drag boats and you wouldn't believe the curve. Drag boat skegs running right hand rotation props will have the stbd leading edge ground on back to mid skeg. On the port side, from mid skeg back to the trailing edge is ground on. This curved skeg is the fastest setup on a single engine.
Outboard drag racers have been sanding/profiling lower units for many, many years, and straight was not what they were after. Running a high x dim will result in increased speed but on a single it will try to prop walk. Prop walk will cause the driver to crab the lower to keep the boat in a straight line. Look at the skeg mounted torque tabs on the fastest of outboard drag boats and you wouldn't believe the curve. Drag boat skegs running right hand rotation props will have the stbd leading edge ground on back to mid skeg. On the port side, from mid skeg back to the trailing edge is ground on. This curved skeg is the fastest setup on a single engine.
10-08-2012 | 09:05 PM
#28
Neno the mind boggler
Joined: Sep 2001
Posts: 13,080
Likes: 320
From: toledo oh
Having a true straight lower on a twin engine appllication is beneficial but i don't think this is the case on a single engine app.
Outboard drag racers have been sanding/profiling lower units for many, many years, and straight was not what they were after. Running a high x dim will result in increased speed but on a single it will try to prop walk. Prop walk will cause the driver to crab the lower to keep the boat in a straight line. Look at the skeg mounted torque tabs on the fastest of outboard drag boats and you wouldn't believe the curve. Drag boat skegs running right hand rotation props will have the stbd leading edge ground on back to mid skeg. On the port side, from mid skeg back to the trailing edge is ground on. This curved skeg is the fastest setup on a single engine.
Outboard drag racers have been sanding/profiling lower units for many, many years, and straight was not what they were after. Running a high x dim will result in increased speed but on a single it will try to prop walk. Prop walk will cause the driver to crab the lower to keep the boat in a straight line. Look at the skeg mounted torque tabs on the fastest of outboard drag boats and you wouldn't believe the curve. Drag boat skegs running right hand rotation props will have the stbd leading edge ground on back to mid skeg. On the port side, from mid skeg back to the trailing edge is ground on. This curved skeg is the fastest setup on a single engine.
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Throttles- Cleveland Construction 377 Talon
08 OPA Class 1 National Champion
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Throttles- Cleveland Construction 377 Talon
08 OPA Class 1 National Champion
08 Class 1 Geico Triple Crown Champion
08 OPA High Points Champion
10 OPA Class 1 National Champion ( happy now Ed! )
10-08-2012 | 09:40 PM
#29
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Joined: Dec 2008
Posts: 618
Likes: 4
Having a true straight lower on a twin engine appllication is beneficial but i don't think this is the case on a single engine app.
Outboard drag racers have been sanding/profiling lower units for many, many years, and straight was not what they were after. Running a high x dim will result in increased speed but on a single it will try to prop walk. Prop walk will cause the driver to crab the lower to keep the boat in a straight line. Look at the skeg mounted torque tabs on the fastest of outboard drag boats and you wouldn't believe the curve. Drag boat skegs running right hand rotation props will have the stbd leading edge ground on back to mid skeg. On the port side, from mid skeg back to the trailing edge is ground on. This curved skeg is the fastest setup on a single engine.
Outboard drag racers have been sanding/profiling lower units for many, many years, and straight was not what they were after. Running a high x dim will result in increased speed but on a single it will try to prop walk. Prop walk will cause the driver to crab the lower to keep the boat in a straight line. Look at the skeg mounted torque tabs on the fastest of outboard drag boats and you wouldn't believe the curve. Drag boat skegs running right hand rotation props will have the stbd leading edge ground on back to mid skeg. On the port side, from mid skeg back to the trailing edge is ground on. This curved skeg is the fastest setup on a single engine.
10-09-2012 | 05:09 AM
#30
Registered
Joined: May 2009
Posts: 1,183
Likes: 6
From: Wenham, Ma
Having a true straight lower on a twin engine appllication is beneficial but i don't think this is the case on a single engine app.
Outboard drag racers have been sanding/profiling lower units for many, many years, and straight was not what they were after. Running a high x dim will result in increased speed but on a single it will try to prop walk. Prop walk will cause the driver to crab the lower to keep the boat in a straight line. Look at the skeg mounted torque tabs on the fastest of outboard drag boats and you wouldn't believe the curve. Drag boat skegs running right hand rotation props will have the stbd leading edge ground on back to mid skeg. On the port side, from mid skeg back to the trailing edge is ground on. This curved skeg is the fastest setup on a single engine.
Outboard drag racers have been sanding/profiling lower units for many, many years, and straight was not what they were after. Running a high x dim will result in increased speed but on a single it will try to prop walk. Prop walk will cause the driver to crab the lower to keep the boat in a straight line. Look at the skeg mounted torque tabs on the fastest of outboard drag boats and you wouldn't believe the curve. Drag boat skegs running right hand rotation props will have the stbd leading edge ground on back to mid skeg. On the port side, from mid skeg back to the trailing edge is ground on. This curved skeg is the fastest setup on a single engine.
