20 Master Angler speed question

wildlifeone · #1 06-01-2006, 10:09 PM

I get about 5700 with a mirage 17 . 43-44 mph. motor is in the 3rd hole up. trim helps a little bit but it still flat. I also have bottom paint which I know hurts the speed alittle, what rpms are you turning with a 19 mirage? how high is the motor?

Bigshrimpin · #2 06-01-2006, 10:42 PM

I have bottom paint, a 8hp four stroke kicker on the back, and the huge console. I can see 45+ with three big guys on the boat with the aluminum Yamaha 19 prop.

I hit 50.8 on my garmin GPS @ 5800rpm in light wind chop with the mirage plus 19 driving solo.

I'll take a picture of the cavitation plate and the hull with the motor down. All the holes on the mirage plus are plugged. I could turn the mirage 17 plus 6100rpm.

Bigshrimpin · #3 06-01-2006, 10:50 PM

I also have removed the high speed spark advance module on my merc. That might be the difference. I believe that the high speed spark advance retards the timing above 5600rpm.

Bigshrimpin · #4 06-01-2006, 11:01 PM

http://forums.screamandfly.com/forum...advance+module

eggsuckindog · #5 06-05-2006, 07:40 PM

My engine is high but is as low as it will go, I will hear the prop losing it some. I guess I'm close to you shrimpin @ 49 - 5600 just think if I can trim it more and get a little more hull up. It will ride higher at mid range just when you put the hammer down, down goes the bow too. I also have a T Top and it must really create some serious drag. I would love to try a Tempest as I read alot on the thread you posted.

I agree with shripmin on checking on raising the motor some, mine is close to 2" above although thats eyeballing.

Bigshrimpin · #6 06-06-2006, 01:27 PM

Egg's you're right up there . . . that Tee-top will slow you down especially at 49mph. The Mirage plus is real nice b/c the bow goes down and it gives you a very controlled ride. . Other props will give you a totally different ride.

My favorite speed is still about 30 - 32mph.

eggsuckindog · #7 06-06-2006, 07:05 PM

Seems my motor sounds best at 3400 to 3600 which is 26/29, its just loping along there.

Bigshrimpin · #8 06-06-2006, 01:11 PM

ACF - See if you can find a place that will let you try out some props. Try a 19 Highfive, Tempest Plus, Laser II, or an Enertia (if you can find one). Report back. The 17 Highfive I tried had more lift than the mirage plus and was a lot smoother. The diameter was a lot smaller and the blades were much thinner too.