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Author Topic:   REVENGE 22-WT Whaler Drive; E-TEC 225
jimh posted 08-26-2014 11:52 AM ET (US)   Profile for jimh   Send Email to jimh  
Recently we had an unusually high load of people aboard our 1990 Boston Whaler REVENGE 22 Walk-Through Whaler Drive boat powered by a 2010 Evinrude E-TEC 225-HP engine. This instance was probably the biggest load we have ever had on the boat. I was curious to see how the boat would handle with all that weight. In addition to seven adults, we had a heavy cooler--loaded with ice and beer--all of our usual cruising gear, and a 5/8-FULL tank of fuel. The extra five adults aboard were three women and two men, all of average or below average weight.

The handling of the boat remained very consistent with its normal behavior with a lighter load. The E-TEC 225-HP engine was easily able to get the boat on plane, and the boat ran very normally at its usual engine and boat speeds for cruise. The only change was a slight increase in fuel consumption, as we were using more power to push the heavier boat.

EJO posted 08-27-2014 09:08 AM ET (US)     Profile for EJO  Send Email to EJO     
Good to know but now have a couple of my friends and myself and you will feel a difference as we are above average weight.
russellbailey posted 08-27-2014 10:53 AM ET (US)     Profile for russellbailey  Send Email to russellbailey     
We run our 1984 Outrage 25 with twin Optimax 150s with a wide range of passengers - from driver only to occasionally 13 total (3 being small kids). I notice about a 4 mph difference in top speed between unloaded and heavily loaded. Did you compare top speed by chance?

One other thing you may or may not notice is how much larger the wake becomes when you are heavily loaded. I suspect most boaters don't pay much attention to the wake, but since we wakeboard a lot we pay attention to the wake shape. Particularly in the transitional speed range (14-16 mph or so) that we pull wakeboarders, there is a substantial difference in the wake when you have 2-3 passengers vs. 12 (since one of the 13 is behind the boat then).

jimh posted 08-27-2014 01:48 PM ET (US)     Profile for jimh  Send Email to jimh     
I did not get to full-throttle. The ladies aboard did not want to get their hair wind blown. We cruised at 27 to 30-MPH.

Re the size of the wake: I have been looking for a good way to measure the wake. One idea: have a plastic ball, preferably a nice red one and about 1-foot in diameter, and toss it over into the wake. Take a series of pictures of the ball in the wake. Since the ball will be the same size in all images, you can compare the height of the wake by comparing it to the ball. To keep the image angle constant, mount the camera in a temporary mount and keep its orientation fixed. Don't forget to go back to retrieve the ball. It will make good practice in boat handling at slow speed.

jimh posted 08-28-2014 12:54 PM ET (US)     Profile for jimh  Send Email to jimh     
Re the boat having deeper draft:

The five additional people had an average weight of 160-lbs, for a total added load of 800-lbs above our normal cruising weight. That is 363.6-kilograms

This extra weight must be buoyed by displacement of additional water. The density of freshwater at 70-degrees is about 998.2-kilograms/cubic-meter. This suggests that a volume of water equal to

363.6-kilograms x 1-cubic-meter/998.2-kilograms = 0.364-cubic-meter

must be displaced to create the addition buoyant force.

If we consider the hull form of the boat to be a simple box, we can figure the added depth as follows:

length = 24-feet, or 7.315-meter
width = 7.4-feet, or 2.26-meter

This gives an area of 16.5-square-meter. To create a volume of 0.368-cubic-meter, this square would only need to be 0.022-meter deep.

If we figure that the hull form is not a square but a triangular prism with 18-degree deadrise angle, we can figure it will need to be twice as deep, or 0.044-meters. Converting that to inches is roughly 1.75-inches.

If the boat runs with 1.75-inches more hull in the water, could you easily detect this by the size of the wake?

Peter posted 08-28-2014 02:47 PM ET (US)     Profile for Peter  Send Email to Peter     
1. At rest is your vessel's length along the water line 24 feet?

2. At cruise, is your vessel's length along the water line the same as it is at rest?

jimh posted 08-28-2014 07:14 PM ET (US)     Profile for jimh  Send Email to jimh     
The length of hull (24-feet) is just an approximation.

When the boat is on plane, there is much less hull in the water than during displacement mode. The hull is lifted by lifting forces generated by the hull form, not by buoyancy force from displacement of water. If this were not true, then the hull would not get on plane.

Teak Oil posted 08-28-2014 10:52 PM ET (US)     Profile for Teak Oil  Send Email to Teak Oil     
I have had 10 people (five adults, five kids), lots of fuel and a livewell full of drinks on my Outrage back when it "only" had a 225 and it did fine, 42-43 mph.

Now with the 300 I have had nine on board a couple times, and the only issue is porpoising at about 48mph so I never go faster than 45 on the smoothest runs. With a normal load the porpoising is not an issue, it is only from having the adults, drinks, fuel, and 700# of outboards in the stern.

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