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Old 20 June 2009, 12:19   #1
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Prop size for Delta 5-5 with 75 mariner optimax

Hi. I have just ordered a new Mariner 75hp Optimax for my Delta 5-5. Does anyone know what type and size of prop i should use. I use the rib for diving mainly and towing the donut now and then. Thanks Seahunter09
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Old 20 June 2009, 13:52   #2
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19 p will be perfect for that boat . My opinion . Cav plate should be 1 inch from bottom of boat and should perform well .cheers baz
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Old 20 June 2009, 14:34   #3
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19p as baz has said but if your going to load it with diving gear or tow, don't be surprised if you need to go down to a 17p
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Old 20 June 2009, 15:03   #4
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I would have thought a 75 on 5.5 would not push much more than 17" on a good day.

I had a 90HP on a 5.3 that would pull a 19 but only just it was more comfortable at 18".

If you can borrow one of each to try first that might be your best bet.
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Old 20 June 2009, 18:10   #5
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My money is on Chris for this one, but as he suggests ask to borrow a second hand 17" to try out before deciding.

Pete
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Old 20 June 2009, 18:14   #6
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75hp on a Delta 5.5 sounds inadequate to me. Did you consider a 90 or 115 Opti? Same basic motor as the 75.
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Old 20 June 2009, 18:22   #7
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Quote:
Originally Posted by Downhilldai View Post
75hp on a Delta 5.5 sounds inadequate to me. Did you consider a 90 or 115 Opti? Same basic motor as the 75.
I'd agree. A 75hp is going to be minimum, A 90 is only a couple of hundred extra and worth it. A 115 would be nice but I think the price goes up about a grand
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Old 20 June 2009, 18:43   #8
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I think the price goes up about a grand
Are you still a Merc/Mariner agent?
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Old 20 June 2009, 19:41   #9
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Are you still a Merc/Mariner agent?
Yes, but don't have the exact prices with me
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Old 22 June 2009, 13:45   #10
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[QUOTE=Ian Sharlot;300568] I'd agree. A 75hp is going to be minimum, A 90 is only a couple of hundred extra and worth it. A 115 would be nice but I think the price goes up about a grand [/Q

The engine that was on it was a 70hp Evinrude VRO. That pushed it along quite well. It has always been my impression that a 90hp was just a 75hp with a different carb. Correct me if i am wrong. I had a Delta 5-5 with a 75hp mariner in the mid 90`s for 5years and that went brilliant. Thanks
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