20 Master Angler speed question

[wildlifeone]

I have a 78 master angler 20 w/ a 200hp mercury1988). I only get about 43 mph wot. and the boat runs very flat in the water. I have tried different props to get lift but no luck. I was thinking maybe the hull had develpoped a slight hook in it may be due to poor support of the transom. are the bottoms absolutl flat .Will a straight edge give me my answer??? The motor has good compression and is ok

[RS]

@ what RPM? It's all relative. The MA's seem to run pretty flat due to the reverse sheer of the bow. Maybe that's what you are noticing. OTOH, you should be able to go much faster than 43 with 200 ponies.

[Bigshrimpin]

I started out messing around with props @ 43/44mph on a MA with a 1981 Merc v225 w/wh-22 carbs. I tried tons of different props (ignoring good advice from everyone who's done this before) and finally broke 50mph this weekend using a Mirage 19 plus.

1. Weight and Wind Resistance make a huge difference. Minimize both.
2. Raising the motor also will give you extra speed especially if the engine is low. Try raising the engine a few holes or get a jackplate.

[wildlifeone]

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]

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]

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]

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

[eggsuckindog]

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]

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.

[Bigshrimpin]

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.