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Old 20-06-2006, 08:51 AM   #1
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What prop?

Can anyone advise what prop I should try on my Extreme 21? I'm running a 3 blade 21 pitch (which is what TD recommended), although I think the prop is a bit crap (Vengence)?

What have people tried with their Ext. 21's?

Also, can anyone tell me what gear ratio I have? (5.7 EFI) and what my WOT rev limit should be?

Thanks.
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Old 20-06-2006, 06:45 PM   #2
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It all depends on what you intend to do with the boat. For all out speed, I would reckon a 23" mirage plus would be the best option, for skiing and hauling fat chicks, a 21" mirage plus.

Gear ratio is 1.5:1, and the max revs are probably 4800.
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Old 20-06-2006, 07:43 PM   #3
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Quote:
Originally posted by Tony Davis
It all depends on what you intend to do with the boat. For all out speed, I would reckon a 23" mirage plus would be the best option, for skiing and hauling fat chicks, a 21" mirage plus.

Gear ratio is 1.5:1, and the max revs are probably 4800.
Listen to TD he knows all about hauling fatty's around in boats!
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Old 20-06-2006, 07:59 PM   #4
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Quote:
Originally posted by MrRob
Listen to TD he knows all about hauling fatty's around in boats!
certainly do, we must have had around 100 stone of prime porky worky on board on Sunday!
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Old 21-06-2006, 07:57 AM   #5
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Quote:
Originally posted by Tony Davis
It all depends on what you intend to do with the boat. For all out speed, I would reckon a 23" mirage plus would be the best option, for skiing and hauling fat chicks, a 21" mirage plus.

Gear ratio is 1.5:1, and the max revs are probably 4800.
Thanks for that, these are 3 bladers right?

Recon the 21 Mirage plus sounds good ... where's the best place to get one from? Prices?

Thanks
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Old 21-06-2006, 02:47 PM   #6
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Quote:
Originally posted by Tony Davis
certainly do, we must have had around 100 stone of prime porky worky on board on Sunday!
Not half mate!
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Old 21-06-2006, 03:54 PM   #7
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Quote:
Originally posted by Tony Davis
we must have had around 100 stone of prime porky worky on board on Sunday!
YEAH, AND IF YOU ADD TO THAT THE PASSENGERS WEIGHT!!
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Old 21-06-2006, 03:57 PM   #8
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You have to wonder how the boat managed to stay afloat.
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Old 21-06-2006, 04:12 PM   #9
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I wasn't planning on taking out any birds that are too fat, I draw the line at about 16 stone ...

It's already got some stress cracks ...
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Old 21-06-2006, 04:16 PM   #10
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Quote:
Originally posted by Biggest Arms
I wasn't planning on taking out any birds that are too fat, I draw the line at about 16 stone ...
Is 16 stone the point at which a bird is classed as fat? Surely there should be some kind of formula based on a height/belly/breast size ratio?
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Old 21-06-2006, 04:26 PM   #11
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Definitely not, but I'm not fussy!
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Old 21-06-2006, 05:25 PM   #12
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Quote:
[i]there should be some kind of formula based on a height/belly/breast size ratio? [/B]
there is if your a man and can play with your own breasts(or even have them) your too fat
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Old 21-06-2006, 05:28 PM   #13
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Quote:
Originally posted by sinkunit0
there is if your a man and can play with your own breasts(or even have them) your too fat
now you know why I dont like getting out of bed in the morning.
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Old 21-06-2006, 07:04 PM   #14
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Quote:
Originally posted by Biggest Arms

It's already got some stress cracks ...
bugger, just as the warranty ran out!
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Old 21-06-2006, 10:31 PM   #15
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Tony, thought it was a lifetime warranty ?? thats why we stopped buing you burgers when you sold us RedMist!!

re the props.... i thought 4 bladers (barvo 1)had pretty much replaced 3 bladers fro all round performance..... there is some prop slip when you nail the hammers on Red or Dead with the 3blade vengenance...

does a 4 blade give you more bow lift or stern lift over a 3 blade? and really which lift is better in a 21 extreme ??
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Old 22-06-2006, 08:18 AM   #16
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Quote:
Originally posted by Admiral P. Brain
i thought 4 bladers (barvo 1)had pretty much replaced 3 bladers fro all round performance.....
there's the problem, too much thinking and not enough listening!!!!! 3 blade mirage plus is the most suitable prop on a 21, and a 4 blade bravo 1 on a 24........The end!
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Old 22-06-2006, 08:31 AM   #17
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Quote:
Originally posted by Tony Davis
there's the problem, too much thinking and not enough listening!!!!! 3 blade mirage plus is the most suitable prop on a 21, and a 4 blade bravo 1 on a 24........The end!
Nice ... OK .. where is the best place to get one? doesn't sound like there will be much availablity on the second hand market?
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Old 22-06-2006, 01:55 PM   #18
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I think they retail for around £450, you can buy one from Neil at Marinautic in Cobbs Quay, they may even have one in stock!
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Old 22-06-2006, 07:10 PM   #19
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Tony, how come Elvis ended up with a 21 vengence and 4 blade mach1 prop?

but what is the answer to bow or stern lift, between the mirage and bravo1 ??

why is the 4 blade better on the 24 than 21ft??


Biggest Arms, post it as wanted on the forum.... you may as well try and flog the 2 you have as well!!
have u checked boatsandoutboards and boatsforsale classified
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Old 22-06-2006, 07:40 PM   #20
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The boat was supplied to Elvis with a Mirage, but I guess he's just another who wasn't happy with what we chose, and thought he could do better, sounds like he didn't!!!!!

The 24 Mach sterndriver is an excellent prop on a 24, we used to supply them until they went bust! For some reason the 24 suffers from very bad cavititation when fitted with a 3 blade prop, but is fine with 4 blades!

As to whats best for bow lift, I've always thought a Mirage was, but I'm happy to be proved wrong. Perhaps this from Merc will go some way to explaining it!
http://www.mercuryracing.com/product...plus-stern.php

For a cheap mirage 21, it's worth visiting a few boat jumbles! Always seems to be some for sale.
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