It completely slipped my mind to ask you this first, as my original post is in the Jet section.
Greg, in your experience with the Eliminator Bubble hulls, is there a sweet spot the ride plate should be set or start at? The current rideplate is set at 5 degrees and the boat is doing the ride plate low pressure false rocker thing when cruising in chopish conditions. The diverter does not seem to be as effective as cruising near top speed (ie, backing it up with enough thrust). My old Eliminator Bubble, which I understand the same hull as my Tracer except it had a delta pad, never did this even with no diverter or ride plate.
Is there a ride plate angle one should never exceed in these hulls?
The 18 Delta and the radiused keel 18 were very similar in setup. Both used the same rideplate angle but the results were different. The radiused keel bottom would give you a good solid ride at a rideplate angle anywhere from 3 to 5 degrees. The delta would give you a slight porpise at crusing speed , you have to remember the delta pad already has a 1 1/2 degress already built in to the bottom. So at crusing speeds the boat wants to take a set but can't because you are not suppling the power to maintain a set. When you say you have 5 degree's of up where are you taking the reading for rideplate angle?
When you say you have 5 degree's of up where are you taking the reading for rideplate angle?
Sorry! I used a straight edge starting a few inches in front of the intake. No noticable hook that I could tell. In the other thread, it was recommended that I took a digital angle finder and compare the rideplate angle with a measurement just in front of the intake, which I will do as soon as I pick up my new angle finder.
So it sounds like my radius keel bottom is not taking a set at cruising speed with the rideplate at it's current positive angle. Shall I try removing two degrees? Would that cause a noticable change at the top end? Thanks Greg!
My guess is that if you are using the straight edge off the bottom of the boat next to the intake you already have a degree and a half of up on the straight edge. So if you take your angle finder and use the same area to take your reading you will find that 3 1/2 degress in the plate will give you 5 up in the plate off the actual bottom of the boat. Remember the delta already has a degree and one half built into it. When we did the delta we took the mold and put it on level ground. Then we took the front and raised it to a degree and a half. At that time we took water and filled the mold, traced a line around the water line and then we made an insert for the pad. So when you took the radius keel bottom boat and put the insert in it you now have a delta bottom 18 with a degree and one half pad. Eventually we built a mold and that is where your boat came from.
Not sure how Jim Cole did his but there were a few boats we did at Eliminator with the same process. The concept behind the delta was to establish a ridding attitude right out of the mold. Give the boat a push and it would take a 1 1/2 degree set on the pad. Simple concept but in the jets we found that a high speeds it just would not load the pump as hard as we wanted to.