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ContinuousWave: Whaler Performance
88 20' OUTRAGE ROOSTERTAIL
|Author||Topic: 88 20' OUTRAGE ROOSTERTAIL|
posted 07-13-2001 08:15 PM ET (US)
I just bought a 88 20' Outrage with an 88 VRO 150HP Johnson. The thing has a good size roostertail that flings off the back in 2 places....a smaller one close to the back of the boat and a larger one that goes about 3-4 ft high at full throttle that reaches full ht about 8-10 ft behind motor. It looks like it starts at front of motor. Tilt is OK. I think that the length might not be right, I know it takes a 25" extra long. Bottom is clean, nothing hanging off back. Interested in opinions. Thanks....
posted 07-13-2001 09:20 PM ET (US)
Assuming there are no tranducers or trim tabs, it's got to be the engine. Either it's too low on the transom, where the anti cavitation plate is causing this, or way too high, where the prop is throwing the water.
Tell us more. I think BW recommended that all engines be mounted 1 hole up. But I've seen many where that was not done. The spray in this situation seems to be more of a V shape, however.
posted 07-13-2001 09:49 PM ET (US)
My rigging sheet from Whaler reccommends 2 holes up with hydraulic steering and 1 hole up with mechanical steering on the 20 Outrage. Why the difference between hydraulic and mechanical, I don't know.
posted 07-14-2001 08:38 AM ET (US)
It's in very much of a v-shape, run your finger through water real quick and you'll get the idea. Will be working on the boat today, can you give me some idea what "holes" your talking about??
posted 07-14-2001 09:35 AM ET (US)
By holes I was refering to the engine mounting holes. By one hole up the engine is raised above the transom one bolt hole. The upper transom bolts would go through the second holes on the engine rather than the top ones.
posted 07-14-2001 10:11 AM ET (US)
I thinkthat the difference between hydraulic and mechanical is probably due to the inherent stability in the hydraulic system. I have found that the higher the engine is mounted the more squirley the boat ride and steering becomes. Hydraulic tends to reduce the "squirleyness" by resisting or damping the motor's tendency to twist on the steering pivot. With a mechanical steering system, you would have to be the damper using the steering wheel.
posted 07-16-2001 06:30 PM ET (US)
Bear, I have a 19' Outrage and a 150 hp Johnson OceanRunner with a 4 blade prop. I thought maybe it was the prop, because I have the same problem. When I tilt the motor up enough, it goes away, but sometimes that causes porpoising. I am going to check the "hole" mine is set on and let you know. Is the consensus that the engine is set too low on the transom or too high?? What are the ramifications of moving it one hole up or down??
posted 07-17-2001 08:39 PM ET (US)
With the "v" spray coming off the engine, the engine is mounted too low, probably on the first (top) hole. Lift the engine one hole (3/4") and the problem will disappear.
posted 07-17-2001 10:22 PM ET (US)
Could the hull have water in it?
Causing the hull to draft more than normal?
posted 07-18-2001 10:08 AM ET (US)
counterstrike-He just bought it. Does it have transducers?
posted 07-18-2001 04:12 PM ET (US)
When you mount your engine one hole up on a 16-7 how does this affect performance? I mounted my yam 90 no holes up. this puts the cavitation plate about one inch above the bottom of the keel which is the max that the Yam manual says. JimU
posted 07-18-2001 04:23 PM ET (US)
JimU, that is about where I did mine. Raised my old 15's 70 up 2 inches + and did not gain any speed and lost ALL of my turning and planning ability. Never overheated but just handled like a carolina skiff.
posted 07-19-2001 12:57 PM ET (US)
According to the mechanic at our local Whaler dealership the cavitation plate should be on a horizontal plane with the bottom of the Outrage. I just had my Outrage repowered and it was one of my questions. If it's mounted too high or too low you can any number of problems. With a new boat you have to play with it, different speeds/RPM's and trim positions until you get it right. If it's mounted correctly make sure you have it trimmed correctly.
posted 07-19-2001 02:28 PM ET (US)
Alan - Your mechanic is only half correct, with his relatively unsophisticated answer. Engine mounting height is a science all by itself, intimately related to propeller choice and boat application and top speed. It's pretty hard to mount a motor too low, unless the hull is less than standard transom height. I have seen this on a few Whalers.
As a general principle, he should have said the this so-called "X" dimension (height of anti-cavitation plate of water flowing off bottom of boat) is usually in the range of 0" to 2". Almost all Whalers run quite well at 3/4". The specific mounting instructions for engines on the 18 Outrage call for the engine to be mounted in the second bolt hole up. I have seen some where this was not done, and the spray problem resulted, with proportionate loss of speed.
There is much discussion on this subject here in the Forum.
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