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Jun
Instead of directly onto the hull. My idea is to keep the transom in line with the original and to raise it the 55to accommodate the longshaft motor.
One non-invasive way of raising the transom on an aluminum boat is to create a lift a bracket that fits over the transom to increase the motors height.
Raising outboard motor on transom. Raise outboard motor. The easiest way to lift your outboard motor. Raising the engine is not normally done until a boat is capable of going over 50mph.
Unless someone put a 20 inch engine on 15 inch transom. Up to 50mph the anti ventilation plate is usually postioned flush with keel when it is trimmed pararell to it. Raising an outboard higher on the transom can reduce drag and raise top speed.
Any owner seeking the last bit of speed from an outboard-powered boat should grab a yard stick. Not to measure boat speed but to gauge the mounting height of the outboard motor on the boat transom. Many boats and motors have their cavitation plate running about 3-4 inches higher than the bottom of the transom and run just fine.
A good way to do it is to put the motor in the top hole go out and test - hole shot top speed turns and motor trim settings. If you have problems go back and drop it a hole - retest. Large size outboard powered boat with a motor well as an example.
The transom is designed for a 25 shaft. If you want to install a 30 shaft the cut at the clamping board level must be raised by 5. Thats all very simple.
You can also raise the bottom of the motor well but keep the same depth inside as a minimum. Due to the motor being blocked it will be able to move up on the transom. It may take a bit to get it started since the silicone might be holding the motor in place a bit.
When the upper mounting bolts holes line up put bolts back through being sure to put silicone around the washer before you push it through. In effectthe motor sits in a well that is 8 lower than the gunnels. My idea is to keep the transom in line with the original and to raise it the 55to accommodate the longshaft motor.
If I raise the height right across the dipwell this will raise the ransom height which would give me more protection from a following seaand when launching. Hang it with the screw clamps flat on the transom to start with and see how it runs. If the engine has the holes to bolt it on try raising it with a 1 block of wood under the engine bracket with just the screw on clamps.
Just run it straight down the waterway. If it runs better there then punch the holes and bolt her up. May 13 2021 by masuzi.
Boat transom heights boost sd with outboard engine height boost sd with outboard engine height who needs a transom saver boatus. The Beginner S Guide To Boat Transom Heights Marine Parts Warehouse Incorporated. Boost Sd With Outboard Engine Height Adjustments Boats Com.
A jack plate is a plate that you mount on the transom of the boats hull. You can then mount the outboard engine of your boat onto this plate. Instead of directly onto the hull.
This plate gives you the ability to raise the plate up or down. Which in turn allows you to. The idea of a transom riser is to essentially make a long shaft motor a short shaft motor.
The theory is you want the cavitation plate of the motor within about an inch of the height of the bottom of your boat. I have done this and it works extremely well. I have a long shaft 15hp Suzuki and a short transom Lund boat.
One more thing. You say that the bow rides high when you are alone. That means you are pushing a lot of water.
Try moving the battery forward and maybe the gas tank. Also try moveing the bar that adjusts the angle of the motor on the transom so the motor sits closer to the transom. That should lower your bow on take off and might help get on plane.
The height of the boat transom dictates the size of the outboard motor. The motor is what powers the boat so the two go hand-in-hand. If the height of the boat transom is off it can cause major issues.
A reverse transom that sits too high can impact the propellers of the motor and motor bracket. One non-invasive way of raising the transom on an aluminum boat is to create a lift a bracket that fits over the transom to increase the motors height. The completed bracket forms a channel and the top of the channel holds the top of the outboard bracket a few inches above the transom of the boat.
Outboard motors are engines mounted on the outside of the stern of the hull. All outboard motors have an adjustable trim angle. The trim angle is the angle of the motor in the water.
The optimum trim angle varies by motor boat conditions and speed. There are three main trim angles. Neutral trim occurs when the motor is parallel to the stern.
The best option is to trailer with the motor as near vertical as possibleon the trim portion of the trimtiltas long as you have sufficient ground clearance. No need whatsoever to trailer with the engine raised needlessly. The least stress on the transom is achieved this way.
However the standard recommendation is that for every 8-10 inches distance between the propeller and the transom the outboard motor should be elevated by an inch. Determining Your Boat Transom Angle. If the motor is moving up and down diagonally on the tilt pivot then a trailer support like the traditional transom saver makes more sense observes Jim Smith of Lock-n-Haul.
But since most boats have a power tilt system that doesnt let that happen and transoms that are rated for particular outboard sizes the trailer tether is. The most common form of auxiliary propulsion for small sailboats is the outboard motor. On some boats it is mounted in a well forward of the transom.
Such arrangements conceal and protect the motor but may not allow it to be tilted up to get the prop out of the water when sailing. More common perhaps is the mounting of a bracket on the transom. Outboard on a Catalina 27 The Catalina 27 that I had 1986 6111 came from the factory with an outboard on a rack - offset to the port side.
There was what looked like 34 plywood backing inside the transom - backing up the engine bracket mounting. However the motor should not be raised more than 5 inches above the standard position. Raising the motor increases the speed of the boat while decreasing the effort needed to turn the boat.