New to me boat “hops” when trimmed

[midtndeerhunter]

Bought a 1860 with a 75 horse on it. Motor runs great but when I get on plane and trim up to ride it starts hopping like crazy if that makes sense. Basically have to keep it trimmed all the way down or it hops and beats you to death. Any ideas what my issue is? Picture shows mounting.

 

[midtndeerhunter]

I might not of explained right lol. From dead stop motor trimmed all the way down. Hops on plan quick but when I trim up even a smidge to try and find that sweet spot it hops like crazy. Any trim up from no trim at all and it's a bucking bull.

 

[Rabbitkil]

Porpoising is what it's called, back down the trim till it stops and enjoy or try one of several products made to combat it.. just depends what your end goal is

 

[smalljawbasser]

How much throttle are you giving it when you start trimming?

They will all porpoise if you over trim at too slow of a speed.

If it porpoises at any speed it's setup wrong.

 

[Doecrusher]

How's the boat loaded?? Any weight up front??

 

[Uncle Jesse]

Whale tail will 100 percent fix it.
I like Stingray

StingRay Hydrofoils - USA

The World's Leading Hydrofoil Boat Stabilizers - StingRay Hydrofoils! Get on plane quicker, stabilize your boat, save fuel, and reduce/eliminate cavitation, ventilation, and porpoising!

www.stingrayhydrofoil.com

 

[Uncle Jesse]

You'll gain speed too because you'll be able to lift the front of the boat like you're trying to do

Every aluminum boat should have one

 

[midtndeerhunter]

This is no load in boat at all. It does it at any speed . You think buy the hydrofoil and see if it fixes or take it somewhere to somebody that knows more than I, which is nothing.

 

[MusicCityCajun]

This is no load in boat at all. It does it at any speed . You think buy the hydrofoil and see if it fixes or take it somewhere to somebody that knows more than I, which is nothing.

Have someone who knows what they're doing look at it. If the prop is mounted just a tad too high or too low in relation to the bottom of the boat it could be catching too little or too much water and causes major problems with the performance .

 

[tnanh]

Buy you a hydrofoil. Dont know what year but 70-75 older Honda and Suzuki 4 stroke engines were known to be very heavy. Put a hydrofoil on my first War eagle with a 70 Suzuki 4 stroke and go full range trim with zero porpoising.

 

[Spurhunter]

Every aluminum boat should have one

Seriously???

 

[Doecrusher]

I'd get some weight in the front whether it be batteries, people, or sand bags and try again. Then maybe raise the motor on the transom a hole.

 

[Uncle Jesse]

Seriously???

Yes, every one with an outboard and power trim.

I've yet to see one not gain top end with a fin and that includes my Ranger RT188

Your experience been different?

 

[Uncle Jesse]

My Ranger would hop too if I bumped the trim any

That's why they welded that stupid angle aluminum to the bottom of the hull that makes water fly everywhere

 

[Mtncur76]

Yes, every one with an outboard and power trim.

I've yet to see one not gain top end with a fin and that includes my Ranger RT188

Your experience been different?

I've put them on 2 different boats and lost speed and didn't really help with anything except the hole shot. Took them back off after 2 weeks

 

[Uncle Jesse]

Aluminum boats?

 

[Chickenrig]

Could it be a prop issue ?
Just thinking

 

[Openlake]

The center of your prop should be 3.5" from the bottom of the hull. That's a starting point.

What rpm's are you getting top end?

 

[chimneyman]

Any dings or chips on your prop

 

[Granddaddy]

Bought a 1860 with a 75 horse on it. Motor runs great but when I get on plane and trim up to ride it starts hopping like crazy if that makes sense. Basically have to keep it trimmed all the way down or it hops and beats you to death. Any ideas what my issue is? Picture shows mounting.

Adjust your trim.