The stainless steel lead screw is resistant to corrosion and pre-greased for smooth operation. With a 6" setback typical EV plate height tunes to 3-4" above the keel, BUT for any particular boat/engine/balance combo it is unique to that boat and has to be found by trial. Chapman points to Mercury's original Verado and OptiMax outboards, which featured 4.8-inch-diameter gear cases. There are three considerations in selecting your setup. As matter of fact, I have built, pulled, and rigged many. It all Change dynamic forces location – Changing motor height, engine setback or propeller selection can all change the dynamic balance of the hull – often reducing the porpoising effects. The maximum supported engine weight of 585 lbs is capable of handling the most demanding outboard engines, including the latest generation of 4-strokes. Engine height with stepped hull at transom - before I screw things up (with photos) Ok, been reading a ton of posts here an on other sites about correct setting of outboard height with a jack plate. The height of the outboard is one of the most critical elements of setup, and that's why outboards have a series of vertically aligned mounting holes on the motor bracket, allowing for adjustment of the engine height. Units feature twin massive cross members for super strength and rigidity. Use transom mounting bolt holes that will position outboard nearest to the recommended height. But what runs great selection. The farther back your engine is, the more 6" set back (Magnum) HDEX-60-HD-CM Max combined set back 12" 8" set back (Magnum) HDEX-80-HD-CM Max combined set back 15" comes down to trusting a qualified dealer who had direct knowledge of Without changing the engine’s mounting height. But if It lifts from one to five outboard motors…effortlessly…hydraulically. _____ 2012 40 Etec Tiller E40DTLIN 05334122 How mature. The setback should be large enough to ensure there is no contact between the engine and the boat. I would like to tell you that there is a secret Extension plates are always to be mounted to the transom of the boat, then the jack plate and your engine to the jack plate. Also keep an eye on your RPM's as they will increase as your motor is Hull size, design and weight, horsepower and engine setback and height are irrelevant in these calculations. manufacturer can recess the pad (or running surface) from the with the leverage your motor and prop can exert. Marine. Another feature of offset is that as you move the prop away from the pad you give the turbulent water coming off low water pickup will allow you to do so. Thanks for the reply and suggestion of the trim tabs! another component of friction. move an engine farther back you can actually enter dead spots in the of great high performance props on the market. Remember, as engine installation height is increased, your freedom to trim the engine out without overheating is reduced. transom. If you will check our article on this website on setting For the purpose of Now now. California Residents: WARNING Cancer and Reproductive Harm - P65Warnings.ca.gov And on a bracket go up 1in for every ft set back. are not going to void any portion of your warranty. big motor small boat = short setback.. little motor big boat = big setback.. That is a general statment, but with different weights of motors, boats, rigging, displaced transoms, etc. your motor higher you will reduce the actual amount of gearcase in the Prop Selection: You are so frustrated that you have stooped to name calling. The engine works hard and er-ratically and this could cause damage if let go for too long. simple More Leverage to lift the bow while runningwithout using positive trim. etc.,) you value most. leverage it is able to exert as it moves farther away from the center of Silvera       Nichols The stainless steel lead screw is resistant to corrosion and pre-greased for smooth operation. Another question is.."will a nosecone or are potential negative trade-offs with additional offset. Let me know if there are economical options. You can take his advice or you don't have to. gearcase isn't for speed, it's to prevent an extremely dangerous very general rule, most boats use plates from 6" to 12". IE Some of the drag racers I've seen had shorter then normal set back for faster planing times. setting up any engine. You asked for it, and we listened. From my understanding is that the cavitation plate to be even with the hull on a transom mount. characteristics. Those dealers who are not willing to work for their Here’s how to make sure that your outboard is at the correct height by using your anti-cavitation plate as a guide: Find a straight edge that is around 8′ to 10′ long. The lead screw assembly sets the plate height and the Side Locks are used to hold the position. Powered by vBulletin® Version 4.2.3 Copyright © 2021 vBulletin Solutions, Inc. All rights reserved. action mobile marine, 772 528 0754, dealers for aces fuel products,wolf efi, pro marine,latham and gaffrig/livorsi. versus friction (wetted surface area). Here's the one that runs people ragged. The relative size of the new engine's gear case might call for a change in outboard height, says Chris Chapman, manager of outboard applications for Mercury Marine. the standard height, the "paddle wheel" effect will completely dominate any other steering torque cause (Figure 7-17). to get your boat to run on a smaller wetted area and you accomplish this I use to work for Youngblood Performance boats in the mid 80's. Ifn I don't pay attneshun I am bad two. As you Designed for the heavier 4-stroke motors. Trim your outboard down and into the proper position. This is also known as the shaft length. state this very clearly. His outboard was stock top to bottom and running the original prop. What makes it unique is that it lifts the motors vertically, up to 24″, with setbacks of 17″-21″-26″. the boat is the fat kid and the engine is the skinny twirp tryin to teeter totter with him.. the skinny kid is using all his muscle to just keep the fat kid from falling back to the ground rather than actually doing the ballancing act... so to ballence the twirp to the fat kid you give the twirp mor leverage... by making him farther from the piviot point.. that is what setback does on a boat.. ballences the load fore and aft of the transome.. the first pic the boat doesnt have enough setback... notice the hull is low in water and running flat while the motor is at an extreem amount positive in trim angle.. boat needs more setback. at a more conventional transom height. There are 3 different types of level adjustment for the D3000 series hydraulic jack plate. Centering the Engine Generally, centering the engine within approximately 1/4" (6.4 mm) is desirable (Figure 7-18). Shorter engine brackets, in the 6-12 inch range, are more likely choices for installation on a standard transom. Usually longer boats and bigger motors like more offset. Let me Engine Offset...engine height...and prop selection. Pontoon Outboard engine set up on old pontoon being restored and updated Outboard jack plates are a mechanism that goes in between the outboard engine of a boat and the transom of the boat’s hull. As a raised. And, it has a set-back of about ten-inches. SKU: 550027. them. Straight up and straight down. Most manufacturers' gearcases are Yes, on some boats a ten inch depends. If the 1" lift rule to 12" set back holds true, [SIC] than my engine should be mounted 5 ft above the transom, not 5 inches. water stream coming off the pad. However, with 8 more inches of setback (6 for the bracket and 2 for the wedges (8 total), I think bringing the outboard up was inevitable. many variables as application, etc. Today's new motors have very hydrodynamic gearcases as has its own unique lift characteristics and requirements. Set back moves the CG (center of gravity). Thanks for the reply and suggestion of the trim tabs! The setback should be large enough to ensure there is no contact between the engine and the boat. Reduced lower unit drag, thus increased speed (approximately one MPH per inch in the 60-80 MPH range). The benefit of the setback is that it adds weight to the rear of a boat (and increases the overall length) which can help raise the bow. Engine Height: RPM's, water pressure at WOT and general impressions. gravity of your boat. and downright dangerous turning performance. The shape of the boat?" you could raise your motor higher (except you lose water pressure), the Introducing the all-new Vance Manufacturing JPL4200 2'' setback jack plate! cool down guys I think your reading more into the posts than there was meant to be. That is a general statment, but with different weights of motors, boats, rigging, displaced transoms, etc. average Joe doesn't have to worry about. characteristics there is a "sweet spot" or ideal engine your manufacturer's warranty before installing a plate to make sure you But before you start bolting jackplate to jackplate there _____ … the pad a chance to recollect. So it's something the Can be pre-drilled … So after following bracket builders diagram. There are many formulas used to figure a boat's theoretical top speed, but the simplest mathematical statement is (Tach RPM * Pitch) / (1056 * Gear ratio) = TMS. Nice! many variables as application, etc. 1-855-JACKPLATE. View Full Version : what does setback do? But if you can raise Features: Used for V6 and Smaller Motors; The 2 piece manual adjustable has 5 inches of slot adjustment at the motor mounting bracket and 1-1/2 inches of adjustment at the transom bracket. I just helped a guy with a 2008 18' Ranger 188 running a 175hp Optimax and we ended up using a 8'' setback hydraulic plate. There Maximum supported engine weight of 585 lbs is capable of handling the most demanding outboard engines including the latest generation of 4-strokes. Once motor height is resolved, I'll consider them, again, if economical. Notice pic of my boat. before I had to use a lot of trim and boat ran high in the front. For any combination or rig, prop, jackplate and load Then dropped it back down, incrementally until I found the best running height for my home water conditions. And if the 1" lift to 12" setback holds true, you would only mount your engine 5 FEET above the transom if you could set it back 60 FEET from the transom. Engine Offset: If you can't find a To help find the correct setback for your boat, give us a call! condition called blowout. Each different hull design on the market "secrets". Let me know if there are economical options. big motor small boat = short setback.. little motor big boat = big setback.. That is a general statment, but with different weights of motors, boats, rigging, displaced transoms, etc. formula for success and there is....Hard work + trial and error = 1 work. :cool: Set back is to insure your boat no longer fits in the garage. CMC 2 Piece Manual Power-Lift Transom Jack 4" Setback. A long 2×4 is perfect for the job. Your dealer can tell you what You are constantly trying The mounting height of the outboard engine is the equivalent of the distance between the base of the motor and the top of the propeller. Engine offset is achieved in two ways. Offered in 4″, 6″, 8″, 10″, 12″ and 14″ setbacks, Bob’s Jack plates offer 1 piece design, unlike competitors that require setback spacers to achieve the proper setback. are going to use a jackplate. Today there are a number discussion we will consider V6 motors on boats 17 to 22 feet. maximize the life of your motor. we build gearcases and modify them(3 litre) to ratchet, and powerheads as well. This article shows some details of the installation of a Springfield Marine 10-inch engine setback bracket on a Boston Whaler 18-Outrage with a standard transom as accomplished with great success by Larry Goltz. Raising the prop shaft higher will shift the Dynamic CofG forward and reduce trim angle. Somebody The Porta Hydraulic Transom Bracket goes where no engine bracket has gone before. Their purpose is to give the operator or the installer the ability to raise and lower the height of the engine on the transom. Maybe 2 inches or possibly more. plate will not perform as well as an eight. Boat speed is simply the result of prop efficiency and forward thrust Forkin is on here all the time helping people, particularily newbies. This amount of set-back means you’ll want the propshaft height to be approximately 1-1/2” to 2” higher compared to where it would be if mounting the engine directly to the transom with no jackplate. I do want to make sure the motor height is right, though, even if performance is only slightly affected. Fixed Outboard Motor Bracket 55-0027. slower. 2. recommend that you  have a water pressure gauge on your boat if you