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Posting a reply to: RE: VMS (Steve) re: 2005 Alumacraft Navigator 165 tiller

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[QUOTE]JH - 5/18/2012  11:38 AM

Is your Navigator the older 84" beam model or the newer 90" model?  Your 50 should be a near perfect  match for the older model.  I used to run a smaller Alumacraft 16.5'x76" beam Lunker with a Honda 30, and I dropped to a 10 3/4x 10"pitch prop for running with a load.  WOT RPM was maxed at 6200 (digitally verfiied), but it jumpd out of the water like it had a 60 on it, and pulled big loads no problem.  4 stroke motors need to run near WOT to achieve best power IMO.  WOT speed was about 26.  With a light load and a 12" std. prop, I hit 28mph GPS'd.
Your boat (assuming it is the older 84" beam model), should hit close to the max 6,000 rpm if it is propped correctly, and you will not lose much if any WOT speed.  You should be able to reach 28-30mph if it is propped correctly.  There is a performance report of a shoot out of 50's a few years back and that Honda on the 84" beam hull ("now called "Classic") and w/ a stainless prop hit something like 34mph with 2 guys in the boat.  I now run a new, 90" beam navigator w/ a 60 Yam. 4/s, and w/ an 11" pitch prop (Hustler) I run 30.8 mph (GPS) with a light load, and 28mph loaded.  You may wish to play with the trim (just below cavitation under plane), and the mounting height of the motor.  If you have that 50 on the 90" beam model, you are a bit underpowered, and will definately need a low pitch prop- something like a 10" pitch, and I would presume would top out at about 25mph at WOT.
I also wouldn't think you'd really need a kicker with that motor, as it should troll down nicely, and the extra weight of a kicker will definatley affect performance.  A friend has the same powerhead in a 40 Honda on a very  similar hull, and we troll all day no problems.[/QUOTE]

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Posted 5/18/2012 11:38 AM (#560566 - in reply to #559680)
Subject: RE: VMS (Steve) re: 2005 Alumacraft Navigator 165 tiller

Is your Navigator the older 84" beam model or the newer 90" model? Your 50 should be a near perfect match for the older model. I used to run a smaller Alumacraft 16.5'x76" beam Lunker with a Honda 30, and I dropped to a 10 3/4x 10"pitch prop for running with a load. WOT RPM was maxed at 6200 (digitally verfiied), but it jumpd out of the water like it had a 60 on it, and pulled big loads no problem. 4 stroke motors need to run near WOT to achieve best power IMO. WOT speed was about 26. With a light load and a 12" std. prop, I hit 28mph GPS'd.
Your boat (assuming it is the older 84" beam model), should hit close to the max 6,000 rpm if it is propped correctly, and you will not lose much if any WOT speed. You should be able to reach 28-30mph if it is propped correctly. There is a performance report of a shoot out of 50's a few years back and that Honda on the 84" beam hull ("now called "Classic") and w/ a stainless prop hit something like 34mph with 2 guys in the boat. I now run a new, 90" beam navigator w/ a 60 Yam. 4/s, and w/ an 11" pitch prop (Hustler) I run 30.8 mph (GPS) with a light load, and 28mph loaded. You may wish to play with the trim (just below cavitation under plane), and the mounting height of the motor. If you have that 50 on the 90" beam model, you are a bit underpowered, and will definately need a low pitch prop- something like a 10" pitch, and I would presume would top out at about 25mph at WOT.
I also wouldn't think you'd really need a kicker with that motor, as it should troll down nicely, and the extra weight of a kicker will definatley affect performance. A friend has the same powerhead in a 40 Honda on a very similar hull, and we troll all day no problems.