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Author Topic:   24 Outrage - Motor Height
aquaman posted 05-03-2004 12:15 AM ET (US)   Profile for aquaman   Send Email to aquaman  
I had my 1994 24' Outrage out for the 1st time yesterday. The boat rides an handles great. The only thing I question is the amount of spray the engine kicks up the transom running at 30 mph and above. The spray does settle down considerably if I trim the engine out. I am wondering if the engine is mounted too low on the transom. I am running a single 250hp Yamaha mounted on the lowest hole. I have seen another contributor to this website who I believe has the same boat with a single 225. I am hoping he might be able to provide some insight. Any ideas what I might try?
kingfish posted 05-03-2004 12:27 AM ET (US)     Profile for kingfish  Send Email to kingfish     
If your motor is mounted directly on the transom and not on a bracket, the anti-ventilation plate should be somewhere between even with and 1-1/2" above the lowest part of the "V" hull bottom, whatever hole that puts you in.
PMUCCIOLO posted 05-03-2004 01:10 AM ET (US)     Profile for PMUCCIOLO    
Aquaman,

I owned a 1994 Outrage 24 powered by a single 225HP Johnson. The motor was mounted on the lowest bolt hole when she was delivered. Research into the subject uncovered the correct mounting position for a single 30" outboard--the third bolt hole from the top. The boat's performance was admirable with that set up.

Her new owner keeps her moored in the same marina where I keep my new express sportfisherman. He is delighted with the Outrage!

Paul

BEACHPANDA posted 05-03-2004 06:47 PM ET (US)     Profile for BEACHPANDA  Send Email to BEACHPANDA     
Hi Aquaman,

Nice name, and great boat. We've got the exact same boat, but with twin 150 HP CR 4s Yammi's. The engines are a tight fit on the transom, and we had to remove the ladder (still have the platform) - but she kicks the heck out of Poseiden. We are underpropped (19" Pitch), and had her doing 52+ mph at 6100/6200 RPM. Spray was not a concern.

What pitch prop do you have? For your engine, I'd go with a 21" Pitch prop. How does your bow ride? Is she high? If so, you might want to drop down in pitch to a 19" Pitch 4 Blade. If you do go to four blade, because the bow rides high, make sure you go with the "S" model. This is for Stern Lift.

One last question... does she cut through waves like a hot knive though butter? If so, then you've got the right engine and prop.

BEACHPANDA

aquaman posted 05-03-2004 07:29 PM ET (US)     Profile for aquaman  Send Email to aquaman     
BP,

I'm running a Yamaha Saltwater Series 15 1/4" x 17" and the engine turns 5500rpm WOT at 47MPH. That sounds like the right prop to me. I doubt the engine could turn a 19" or 21" in this series and the series is designed for bow lift on larger offshore boats. I'm going to adjust the engine height up and see what happens. I suspect the speed might increase an mph or two with less drag in the water.

Thanks,

John

aquaman posted 05-16-2004 10:51 AM ET (US)     Profile for aquaman  Send Email to aquaman     

I had the engine height changed to the third hole and the boat runs great. No spray and a little bit faster, 47-48mph at 5700 rpm with 3 people in the boat and half tank of fuel. Sounds like I could go to a 19 pitch and see what the change that would make. I don't really care much about top end speed but if the 19 would give me a mph or 2 difference at cruise speed the MPG might increase a bit. What do you think?

John

Moe posted 05-16-2004 11:31 AM ET (US)     Profile for Moe  Send Email to Moe     
Personally, I think the 19" would be about right, probably keeping you above 5,000 rpm with four people and a full tank, and below about 5,500 rpm with two people and a half tank. You may also see better fuel mileage and lower noise level at your current cruise speed.

--
Moe

jimh posted 05-16-2004 11:43 AM ET (US)     Profile for jimh  Send Email to jimh     
John--I think your decision on the propeller is prudent. I am not aware that changing propeller pitch can affect how the hull form interacts with waves. That is mainly affected by the hull shape and the hull's attitude to the waves. The hull attitude is affected by the engine trim and the propeller lifting, but in my reading I have never seen propeller pitch associated with being able to change the hull's interaction with waves.

Your observation of excessive spray from the engine lower unit is a good one. That is usually an indication of too much immersion of the lower unit. Generally most engines have a secondary fin or foil above the anti-ventilation plate, and it is my observation that if the engine height is correct, spray coming off the lower unit at the water surface will hit this secondary foil and be deflected downward.

If you have a fuel flow gauge and can make real-time measurement of fuel consumption rates and speeds, you might be able to optimize your fuel usage in some short term tests with different propellers. If you don't have that level of instrumentation on board, I think it would be difficult to get a good measure of your fuel consumption rate in a short time.

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