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1989 Outrage 18 re-power YAMAHA F115 prop
trionfale	#1  Posted on 04/10/23 - 9:51 AM
Member Personal Page Posts: 36 Comments: 2 Joined: 03/27/05	I would like to re-power Maripà 2 (http://www.whalercentral.com/infusions/personal_page/ppages.php?ppage_id=22): 1989 Outrage 18' T-H Marine 25” bracket 12" x 14" homemade trim tabs 2011 Evinrude ETEC G1 E150DCX 433 lbs 45 mph 5,500 rpm WOT VIPER 14 3/4 x 19” I’m going for a new YAMAHA F115 four-stroke 377lb Comes with a 13.25 x 17" Painted Stainless Steel (K) propeller. I'm afraid it won't go at all. I look forward to hearing some of your advice. Edited by trionfale on 04/10/23 - 9:52 AM
Phil T	#2  Posted on 04/10/23 - 10:06 AM
Administrator Personal Page Personal Album Project Albums Posts: 6991 Comments: 6 Joined: 03/26/05	P - The engine does not include a prop, the dealer is selecting that prop as a guess. There is some good performance data on the Outrage 18 and the F115: Prop installed 13 1/4 x 19 Yamaha Painted Stainless Steel Engine mounted all the way down. Test results with a Yamaha 115 hp four stroke EFI on a 1988 Outrage 18, no bottom paint, motor mounted all the way down: (Wind variable 5 kts; smooth fresh water lake; air temp 65 degrees; water temp approx 60 degrees; approx 1000 ft altitude; humidity approx 65%; on board me (210 lbs) & brother-in-law Larry (170 lbs); no RPS--it's at home all torn apart being spruced up; no live bait tank any more; 30 lbs of weights midships; two batteries in console; anchor chain & rode; 3/5 tank of gas, maybe 37-8 gallons.) All measurements via GPS and Yamaha digital multi-function tach. No current and negligible wind, so I didn't run in reciprocal directions. 700 rpm = idle 700 rpm = 3.1-3.3 mph 1100 = 4.7 1500 = 6.2 1600 = 6.3 2200 = 8.0 2500 = 9.0 2800 = 11.4 3100 = 16.2 (barely on plane, trimmed all the way down) 3500 = 22.0 3700 = 24.6 4500 = 30.0 4600 = 31.7 4800 = 34 5000 = 36.0 5700 = 40.8-41.1 Edited by Phil T on 04/10/23 - 10:10 AM 1992 Outrage 17 I 2019 E-TEC 90, Viper 17 2+ 2018 Load Rite Elite 18280096VT
Phil T	#3  Posted on 04/10/23 - 10:08 AM
Administrator Personal Page Personal Album Project Albums Posts: 6991 Comments: 6 Joined: 03/26/05	With a 25" bracket you will take a performance hit. Have you considered removing the bracket? 1992 Outrage 17 I 2019 E-TEC 90, Viper 17 2+ 2018 Load Rite Elite 18280096VT
trionfale	#4  Posted on 04/11/23 - 11:56 PM
Member Personal Page Posts: 36 Comments: 2 Joined: 03/27/05	Dear Phil, many thanks for your prompt and comprehensive reply. Your evidence is extremely important to me. 3100 rpm = 16.2 mph (14 Knots) -barely on plane- is a crucial information. I'm not going to remove my T-H Marine 25” bracket and the two large trim tabs because I'm convinced that they largely contribute to facilitate to stay on plane. I mainly sail the Mediterranean Sea that can be surprisingly choppy. I will take the 13 1/4 x 19 prop as a reference. Paolo Edited by trionfale on 04/11/23 - 11:57 PM
Phil T	#5  Posted on 04/12/23 - 9:18 AM
Administrator Personal Page Personal Album Project Albums Posts: 6991 Comments: 6 Joined: 03/26/05	Caio Paolo - With the reduced power, you many want to experiment with a 4 bladed prop. This will help get up on a plane at a lower speed and keep the hull from falling off plane. When going from 3 to 4 blade, you drop 2 inches of pitch. Hope this helps. 1992 Outrage 17 I 2019 E-TEC 90, Viper 17 2+ 2018 Load Rite Elite 18280096VT
onokai	#6  Posted on 07/05/23 - 11:56 PM
Member Posts: 2 Comments: 0 Joined: 09/09/07	I just repowered my 1986 18 with a yamai 115 witha powerteck 4 blade. Taking it out this weekend to baby the 1st 10 hours on the new engine.