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Author Topic:   Vented props for the Conquest
JoeyP posted 03-13-2002 05:36 PM ET (US)   Profile for JoeyP   Send Email to JoeyP  
Ok,I have heard the 26 Conquest sits in limbo with bow up between 3000 and 3500 RPM, running with twin 200 Opti's. Would the use of these new vented props help alleviate this?
lhg posted 03-13-2002 07:53 PM ET (US)     Profile for lhg    
I don't think so. It's probably the running characteristics of the boat hull causing this, along with the substantial weight. The newer deeper vee Whalers are much harder to plane off then the earlier models. This is a major trade off for the smoother ride into a chop.

I would imagine the Opti powered Conquests come with Mirage props, and factory furnished with the solid vent plugs. For a couple of bucks, a set of open plugs could be tried out. Generally, venting is controlled slippage for better acceleration out of the hole, allowing the engine to rev up quicker to a higher HP output. Once planing at about 25mph, the water passing over the prop seals the vent hole completely.

For the condition you're describing, venting would add to the problem, causing slippage and higher revving. With vented props, the last thing you want to do is lug along at "hole digging" speed.

JoeyP posted 03-14-2002 02:28 PM ET (US)     Profile for JoeyP  Send Email to JoeyP     
Thanks Ihg...good info. Now,I was reading about the four blade props on Mercs web site. They seemed to be recommended for heavy hull boats. Do you see any benefit to these type props?
OutrageMan posted 03-14-2002 03:13 PM ET (US)     Profile for OutrageMan  Send Email to OutrageMan     
I am running the Merc Revolution 4's on my 7500 lb 24' Bertram. Performance was greatly improved. Like your situationg, getting on plane was a long time comming. With these new props, I now say "what hole".

Brian

JoeyP posted 03-15-2002 01:18 PM ET (US)     Profile for JoeyP  Send Email to JoeyP     
Outrageman was your top speed reduced after switching to the Rev 4's?
OutrageMan posted 03-15-2002 01:32 PM ET (US)     Profile for OutrageMan  Send Email to OutrageMan     
You wan't believe this, but I actually gained 2mph. I can now run 53 mph @ WOT (gps). The mechanic believed that the spped increase was caused by replacing the old elephant ear props that had some dings in them to the Rev 4's.

Brian

JoeyP posted 03-16-2002 09:42 PM ET (US)     Profile for JoeyP  Send Email to JoeyP     
I contacted Boston Whaler on the issue of four blade props for the 275 Conquest with twin 200 Opti's. Here is the repsonse:

"I've forwarded your message to the Engineering Dept. to see if they have
already tried the Revolution 4 props on the 275 (it may take a while for a
response as they work a four day work week..)
Judging by previous testing with Offshore 4 blades and the Opti's, the
planing has been a little slower and the top speeds were reduced.
The 3 blade Mirage plus seems to work out better for all around conditions"

This response was sent back to me within a few hours of the request. Not bad at all for BW. I was impressed to say the least.

lhg posted 03-18-2002 02:28 PM ET (US)     Profile for lhg    
I believe the new Mercury "Revolution 4" props are for go-fasts, and not the same application as the 4 blade "Offshore" series.

Mercury also advertises that the "Offshore" props are not quite as fast as the "Mirage" series, but have better hole shot & lots of lift for heavy twin engine boats. They supposedly hold exceptionally well in offshore conditions.

But I would stick with the Company's test results.

JoeyP posted 03-18-2002 09:21 PM ET (US)     Profile for JoeyP  Send Email to JoeyP     
Your probably right. If ain't broke don't screw with it. I'll wait and see if I hear any more info from BW. If I do, I'll post the reply.
JoeyP posted 03-19-2002 05:58 PM ET (US)     Profile for JoeyP  Send Email to JoeyP     
Here's the latest from BW. Apparently, they have not yet tested the Merc Revolution 4 props:

"I forwarded your message to our engineering staff.
From what I understand, they are going to try and submit an order for a
selection of Revolution 4 props to test on different models. Hopefully, the
order will be approved..."

Lets see what happens now.

OutrageMan posted 03-19-2002 07:51 PM ET (US)     Profile for OutrageMan  Send Email to OutrageMan     
I think this is some very good service being given to you. You would think that with all of the talk here that the current Whaler company is basically destroying itself because it doesn't listen to or care about its "core" customers, that you never would have gotten a response.

Brian

JoeyP posted 03-20-2002 02:30 PM ET (US)     Profile for JoeyP  Send Email to JoeyP     
Yes, I have to agree. I recently went on the BW website and noticed some changes to the site. Maybe the customer service complaints finally hit home.

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