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2013 Mercury 150 4 Stroke
HRBertram	#1  Posted on 09/27/13 - 7:07 AM
Member Personal Page Project Albums Posts: 21 Comments: 1 Joined: 01/30/10	I've powered my 1978 Low Profile 19 with a new Mercury 150 4 Stroke, I've tested the rig with both a 18 and 19 Mercury Mirage Propellers. Top speed was 50MPH light load using either propeller. The 18 runs 5800 and the 19 runs 5500 at 50 MPH. I've decided to leave the 18 on, this prop gives me a minimum planning speed of 13 MPH at 2250 RPM, 20MPH at 2500, 25MPH at 3000, 30MPH at 3500, 34MPH at 4000, and 38 at 4500. At 50MPH with the engine fully trimmed the boat is running on the last 2-3 feet of the center sponson. The following video shows the boat at 4500 during the run from the right side of the screen to the left, and the second run (from left to right) will show the boat at 50MPH and fully trimmed. http://youtu.be/F2tC7L1MEOU
sosmerc	#2  Posted on 09/27/13 - 10:04 PM
Member Posts: 16 Comments: 0 Joined: 06/07/09	What mounting height are you at? Very nice looking boat. sosmerc
HRBertram	#3  Posted on 09/28/13 - 4:14 AM
Member Personal Page Project Albums Posts: 21 Comments: 1 Joined: 01/30/10	The engine is mounted on the lowest hole position, the cavitation plate is about 1" above the lowest portion of the center sponson.
wannabe	#4  Posted on 09/28/13 - 6:14 AM
Member Posts: 287 Comments: 1 Joined: 06/03/09	Very nice! My favorite hull. Drew 1988 Outrage 18 - 1988 Yamaha 130 hp
HRBertram	#5  Posted on 09/28/13 - 7:27 AM
Member Personal Page Project Albums Posts: 21 Comments: 1 Joined: 01/30/10	Thanks, It was a good project for an old chopped up Revenge. It's a fast hull, and with a 7'4" beam its a very stable platform for fishing, diving, swimming, etc. And when the going gets rough it will plane at very low speeds for a smoother trip home.
Tom W Clark	#6  Posted on 09/28/13 - 7:54 AM
Member Personal Page Posts: 4280 Comments: 7 Joined: 09/30/05	The engine is mounted on the lowest hole position... That is ambiguous. The motor is four holes up? o o o o o <-- Mounting Bolts Through This Hole?
HRBertram	#7  Posted on 09/28/13 - 8:59 AM
Member Personal Page Project Albums Posts: 21 Comments: 1 Joined: 01/30/10	I know I thought about that after I submitted it. I wrote that while eating breakfast and still half asleep. The engine is mounted all the way down, and it surprised me that the cavitation plate was still at least an inch above the bottom of the sponson. This puts allot of the transom bracket under water.
Tom W Clark	#8  Posted on 09/28/13 - 9:29 AM
Member Personal Page Posts: 4280 Comments: 7 Joined: 09/30/05	That does not sound right. Are you sure you are not confusing the spray shield with the A/V plate? With the motor all the way down, the A/V plate would be about 1" below the hull, the spray shield would be about 1" above the hull http://www.rifmarine.com/wp-content/u...8x1024.jpg
HRBertram	#9  Posted on 09/28/13 - 11:54 AM
Member Personal Page Project Albums Posts: 21 Comments: 1 Joined: 01/30/10	The A/V plate is about 1" above the hull bottom, the boats in a lift and I just double checked. I didn't add anything to the transom height, I did add 6 layers of 24 oz stitchmat to the thickness. And the center of the top mounting holes are 1 7/8" below the top of the transom cap. The boat will cavitate if I try a tight turn at low cruising speeds, and that's with the hard biting Mirage Plus prop.