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Thread: Chopper Props
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12-14-2003, 10:50 AM #1Junior Member
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Chopper Props
I am confused by the various terminology used to describe chopper props. Can some one explain the difference between chopper I and chopper II, and small ear and large ear.
Are these props still made by Mercury ?
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12-14-2003, 11:05 PM #2
The types differ by diameter, blade width and hub style.
Aquaholic will most likely reply soon with the correct answers to your questions. He's a chopper maniac...'89 Hydrostream Vegas XT, '90 Merc 2.4 Bridgeport PCU EFI
My YouTube videos________My Flickr photo gallery
http://www.facebook.com/profile.php?id=1706097519
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12-14-2003, 11:48 PM #3
Choppers
Small ear--early--hub protrudes out the back. Blades are thin , narrow , and very fast. They also crack easily.
Intermediate--30P made with rake like the small ear and narrow blades, but with the same metalurgy and main casting of the big ear--not many of these around and they are not the greatest according the Aquaholic
Big Ear=Chopper 1--later style--hub recessed in back
(The early chopper1 or Big ear had a completely pressed in hub, while the newer style had 3 notches in back and a seperate rear pc for the nut lock .) A4 casting is thinner then A5.
Chopper 2---no weed cutters, Flo Torque hub , otherwise looks like the Big Ear.
Correct me, but this is what I have always understood to be the terminology.
Last edited by steve; 12-15-2003 at 09:06 AM.
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12-15-2003, 05:20 PM #4Junior Member
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AQUAholic,
Thanks very much for the advice and the pictures - could not have asked for more information.
I now know that the two that I have been using are Chopper I small ear.
I run a Mercury 200 HP Opti 2002, and am getting about 68 mph on a Ring 21 sportsboat.
Many Thanks for the help.
Graham
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12-15-2003, 05:38 PM #5
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12-16-2003, 08:24 AM #6
Graham-
You'll need a BIG ear on a 21 foot anything...
Lots of good cheap prop deals this time of year. Do some christmas shopping...'89 Hydrostream Vegas XT, '90 Merc 2.4 Bridgeport PCU EFI
My YouTube videos________My Flickr photo gallery
http://www.facebook.com/profile.php?id=1706097519
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12-17-2003, 05:53 PM #7Junior Member
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Thanks for all the advise. My boat is quite light, and seems to run well with the small ear choppers, in a variety of sea conditions. The previous prop - Laser II 23 inch, caused uncontrollable chine walking, which I do not seem to suffer with using the chopper.
Do you think the big ear would be better still, or would the larger blade areas bring back the chine walking ??