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ContinuousWave: Whaler Performance
Conquest 23 w/ 225 Optimax Prop.
|Author||Topic: Conquest 23 w/ 225 Optimax Prop.|
posted 09-09-2003 09:22 AM ET (US)
My other Whaler is a 2001 23' Conquest with a 225 Optimax. She came with a Mirage propeller and the only complaint I have about the boat is that it takes a good long while to get on plane - with lots of bow lift to boot.
Any suggestions on trying another propeller to reduce this problem? Mercury's web site shows a Revolution 4 (4-blade) that sounds interesting. Any advice is appreciated.
Email to ronjaneczko@sbcglobal if you like.
posted 09-09-2003 10:23 AM ET (US)
Ron - it would help if you told us what the pitch of your Mirage propeller is.
posted 09-09-2003 11:24 AM ET (US)
Good question. I just repowered my 1990 Revenge 22 W/T with a 2003 Merc Optimax 225 in May. The engine came with a 19" 3-blade aluminum prop and I had them throw in a 17" Revolution-4 4-blade stainless as part of the deal (of course I paid more!). Real interesting results:
19" aluminum 3-blade prop:
17" stainless Revolution-4 4-blade prop
I really like the 27.7 knot cruise and 3.1 nmpg, so my Revolution-4 is sitting in my baitwell as a spare. The dealer wanted $600 for the Revolution-4, but I found it on the internet for $440+$20 shipping.
posted 09-09-2003 01:42 PM ET (US)
JimP's reports here illustrate an important point in selecting a propeller. What do you want out of your propeller? Good cruising or top speed. This is a question that is asked by Mercury's prop selector.
Yamaha advertises that its Saltwater Series propellers (what I have on my Yamaha 225/Revenge 22) is designed for cruising. If I wanted to squeeze out more top end then a different propeller would probably be desirable but I would be giving up some efficiency at cruise. Since I mostly run at cruising speeds and rarely WOT, the Saltwater Series propeller is a suitable choice.
posted 09-09-2003 06:40 PM ET (US)
For both of the boats mentioned above, I would think the 4-bladed "Offshore Performance" would be appropriate. It seems inconceivable to me that the Revolution, which is a speed prop, would be appropriate for a Revenge. A Mirage would be far superior to an standard aluminum on a 225 Optimax also.
However, if Whaler shipped a Mirage with the 23 Conquest, I would assume they would do this on the basis of their testing. It could be that the 225 is marginal HP for the boat, and twins are needed.
posted 09-12-2003 11:22 AM ET (US)
My 01 Conquest came with a 15 1/2" x 17" Mirage Plus on the 225 Optimax.
Maximum operating range is 5,750 RPM, though I cannot attain that. I understand going to 4 blades (Revolution 4) would give me more hole-shot and reduce maximum RPM by 50-100. So, if I got the same size R4 prop, I would get further away from maximum. The R4 comes in 14 5/8 x 17, which is slightly less diameter than stock 15 1/2". Does anyone know what the effect of that is (if any)? Or does everything only have to do with pitch?
posted 09-12-2003 12:06 PM ET (US)
Ron - forgot to ask: (1) what is your WOT rpm when the boat is most typically loaded for you and (2) what is your WOT speed?
posted 09-15-2003 08:37 PM ET (US)
I'd have to run the boat again to get exact figures. I recall about 40 MPH at 5300 RPM, which is lower than I would expect. I'll try some runs on Wednesday (before I double up my lines in preparation for the storm - have to pull out the Sport 13 that I have moored in front of our cottage).
posted 09-16-2003 07:31 AM ET (US)
Assuming your recollection is good on the numbers you post, your 225 might be a candidate for a 15 inch pitch propeller. My recollection is that the 23 Conquest is a fairly heavy boat possibly having a dry weight that could be 1000 lbs more than a 22 Revenge.
I think you should see if you can get someone to loan you the correct size stainless steel 15 inch pitch propeller and give that a try. See where your WOT rpm and speed are. It will certainly help the hole shot and will reduce the prolonged bow lift because it won't take as long to get on plane. It should put your WOT rpm at the upper end of the range near the 5700 mark.
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