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Trying to get on plane


Flygaff

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Here's what I got. My Boat is a 2010 G3 Angler 185F. 1700 pound hull. When I purchased the boat a couple of months ago it had a pair of 2010 Yamaha 8 HP engines mounted on it. I removed the 8 HP Yammis and replace them with a pair of 2021 Suzuki 9.9s  upgraded to 20 HP each. I would have thought I would easily get up on plane with twin 20S. I have gone thru a few prop combinations. first i tried the supplied 9 1/4 x 5.5 Pusher props. RPMs hit the limiter quickly at 6.5 MPH. Next a pair of 9 1/4 x 11. 4200 RPMs at 9.5 MPH. Next I went down to 9 1/4 x 8. 5850 RPM at about 10 MPH. I then went to 9 1/4 x 7 4 Blade prop. RPMs hit limit at 7.1 MPH. The memory in the sonar unit says this boat went up to 18 MPH with the twin 8s. The strange thing about the boat is it had approx 320 pounds of weights in the transom well. I have not put them back in yet, but I can't understand what they would do to get the boat on plane. any thoughts?

Thanks

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I have a 60 hp yamaha on my G3 17 guide and it gets up on plane, but it doesn't have a great hole shot due to being a four stroke. I think you are way under power for a boat that size and weight. What does the manufacturer recommend for maximum HP? 

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when I walk up to the bow when running the speed jumps up to 11.4.  i know I'm close to plane. I wonder how it went 18 with twin 8 hp motors

If I can just get it near 18/20 I will be satisfied. I am thinking about two hydro foils

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First off, hull speed on your boat is about 6.7 mph, so anything beyond that the boat is planning. But you lack the hp to push it faster. I seriously doubt that twin 8 hp motors pushed it any faster than what your already seeing. And I don't think adding hydrofoils is going to do much else.

The one thing that may help is making sure your cavitation plate is even with the bottom of your bloat. If its below, see if you can raise them up a hole or two.

But overall, your simply under powered.



Sent from my SM-S901U using Tapatalk

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1 hour ago, Misdirection said:

First off, hull speed on your boat is about 6.7 mph, so anything beyond that the boat is planning. But you lack the hp to push it faster. I seriously doubt that twin 8 hp motors pushed it any faster than what your already seeing. And I don't think adding hydrofoils is going to do much else.

The one thing that may help is making sure your cavitation plate is even with the bottom of your bloat. If its below, see if you can raise them up a hole or two.

But overall, your simply under powered.



Sent from my SM-S901U using Tapatalk
 

I have the cav plates 1/4 inch above the bottom. i can't figure out why the dealer placed 320 pound of extra weight in the engine well. I my put it back and see what happens. 

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Adding weight has never helped any boat go faster , period . How do you know for sure what motor or motors where on it when it hit 18 mph ? Does the display say what motors are on it for different speeds ? Lose as much weight as you can , foils will cause more drag because your UNDERPOWERED for the umpteenth time.

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This was a dealer rigged boat with the twin 8s. The only engines ever on the boat. I just don't know why they would have added 320 pounds to the stern. The logs in memory on the hummingbird says on multible routes 15 MPH and up the 18. Strange. I will try distributing the weight and trying again. I do know i'm underpowered. just trying to squeeze a little more speed out of her

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Leaving the unit on and driving it on the trailer? I know where we launch, we load the boat on and then drive 1/4 mile to unload everything and secure the boat. Numerous times I left electronics on for that ride. It would probably be right around those speeds too.

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Checking the original catalog for specs., my 1996 17 ft. Starcraft hull weighs in at 1000 lbs. My 90 hp. Mercury 2-stroke weighs 303 lbs.

 

That's a dry weight of 1,303 lbs. pushed by 90 hp. The boat is rated up to 125 Hp. I run fully loaded with 2 people and gear at 40 mph. with a 19 pitch aluminum prop. It sounds like your weight to horsepower ratio is way off.

Edited by J.D.
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I must be missing something here... lol..

I have an alumacraft 185 with a 140hp on it... its rated for a 175hp..

I've personally never heard of anyone putting twin 9.9 kicker motors on a boat that size for its main propulsion...

I have a 9.9 on the back of mine STRICTLY for trolling... I can tell you 100% that with will NEVER put me on plane...

Even 2 of them will never put me on plane...

I'd put a minimum 90hp on that thing.. you'll plane just fine..

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what hp is the hull rated for. I believe you would be so much better off if you just sold the 2 small motors and got one larger hp motor. if we didn't live so far apart, I have a great running 70 hp Johnson, I could give you a great price on. my 115 wasn't running and I didn't know if it could be fixed so I bought the 70 hp to replace it. but the 115 got fixed and I have no need for the 70.

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Lake restrictions of 9.9 hp. They don’t seem to care how many you hang on the transom. I upgraded them to 20 hp each. I am keeping my eyes open for a 90 or 115. The boat could be ordered with a 90 or 115 and the hull is rated to 200

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38 minutes ago, Flygaff said:

Lake restrictions of 9.9 hp. They don’t seem to care how many you hang on the transom. I upgraded them to 20 hp each. I am keeping my eyes open for a 90 or 115. The boat could be ordered with a 90 or 115 and the hull is rated to 200

MOST LAKES that have a HP restriction around me, allow the boat on the water no matter how big main motor is as long as it's up in the air out of the water...

They dont WANT YOU on plane.. lol

Even if its 2 or 3 smaller motors

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