Ranger 619 Ride/Prop/Motor Question

[nels24022000]

So i have had my 619 for a few weeks now and I am totally impressed and still very happy wih my purchase. I have been trying different props and have not found one that performs as well overall as my tempest 21.

The only thing is when going between 30-40mph the bow of the boat tends to bounce even when playing with the trim. Could this be fixed by adjusting the motor up or down or switching to a higher pitch prop?

Thanks!

[budsbud66]

correct me if im wrong but, If you drop down 1 hole of height it should help correct it.
Its alot cheaper then finding a different prop, especially if your happy with the tempest. You will lose a little off the top, but who care. the only thing 6000RPM's is good for is blowing up outboards.

[BroadwayBill]

What motor?

Bill

[nels24022000]

I am running a 2001 200 Optimax.

Yeah I though adjusting the motor position may be the ticket.

[REW]

Nels,
Put on a set of Bennett fully adjustable trim tabs and you will be able to dial out any boat bounce, adjust for load changes, and help to lower the planing speed.

Also, by deploying the tabs on hole shot, you will recuce your bow rise to near 0.

Take care
REW

[nels24022000]

Yeah I may have to try the trim tabs if nothing else works but normally with proper adjustment and proping i have been able to do what i need to do without the expensice tabs. For over 600 bucks for the tabs i can do alot of re-proping... I have heard good things about them. I was shocked how fast the boat jumps out of the hole with the 21p prop so for sure dont need them for that.

[BroadwayBill]

Shouldn't really have issues with that motor on the back. I couldn't trim my last 620 at all until it was full tilt or I would start to porpoise. Heavy 4 stroke Some hulls are more temperamental than others but my first thought would be a 4 blade prop. If you can't get it propped right and still are annoyed by the porpoising then just put an Edge Hydrofoil on it and you will eliminate the issue for a little over a 100 bucks.


Bill

[staylor]

...the methods are listed in the order that usually works best with the least effort, although in my case I skipped number 2 and 4 because I knew it would cost me top end. By the time I got to step 5 I was done- no more porpoising.
1. raise the motor if you can raise it and not get too much venting
2. Move weight of loose gear forward if you can
3. Go to a lower pitch prop if you can
4. Go to a prop with more blade area if it doesn't kill the top end- changing to a Rev 4 from a Tempest will do this on your rig
5. Add a cav plate mounted foil
6. Add transom mounted tabs

Doug

[nels24022000]

Thanks! This all gives me places to start!

[Kyle Posterick]

I bought a used boat the guy hated because it did exactly this, bounced like a **** fool down the lake if you tried to trim it at all. Ended up lifting the motor and the problem went away.

Im not familiar with how a heavy fiberglass hull responds, but from what I can tell when a motor is rigged to low the cavitation plate acts like a shovel in the clean water coming under the hull, when you trim it points the nose of the cav plate down. There is a natural tendency to dig and as a result the bow lifts as it tries to return back to level in the water. Then it looses all its bite and drops, then the whole process repeats itself over and over and you bounce down the lake.

By lifting the motor you reduce the amount of cavitation plate in the clean water and you lessen its ability to dig in the clean water. Also motors will tend to pick up rpms as you lift them. This might allow you to increse a prop pitch.