My boat has the original 28x31x4 dyna quad props. I can’t seem to find anything on whether the OEM props have any cup and if so what number? I need to order a spare set, and I also need to reduce pitch on the originals to achieve 2300 rated, and am in need of this information. Because I only have the one set that’s on the boat, the answer to this question means the difference between a short haul to swap props and blocking the boat on the hard for a week and a half while they’re sent off to find out.
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Thread: 53MY Original Props Cup?
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07-20-2021 09:30 AM #1
53MY Original Props Cup?
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Re: 53MY Original Props Cup?
Probably no cup.
Sams or Hatteras may be able to answer your question with high detail.
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Re: 53MY Original Props Cup?
Isn't the original prop spec listed in the owner's manual book?
Eric
41TC 1966 Hull #53 "Requisite"
Kent Island, MD/Ft. Lauderdale, FL
"Though she creaks - She holds"
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07-20-2021 10:14 PM #4
Re: 53MY Original Props Cup?
Yes it does, that’s how I knew they’re 28x31. Just doesn’t say anything about what number cup. I’m guessing that means there likely isn’t any but just wanted to confirm. Having no cup on large inboard props isn’t that unusual unless the boat has tunnels or clearance issues so it wouldn’t be that surprising. Just wanted to verify if somebody knew for sure.
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09-12-2021 10:44 PM #5Registered Member
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- Dec 2015
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- 18
Re: 53MY Original Props Cup?
I have the original props for my 53 MY 1979 and they are 28x31 federal EQUP Quad Dated 2/79 they were not cupped (old version of the modern dyna-quad Michigan wheel)
Originals are bronze. I just received a set of NIBRAL 28x30 dqx props that I have not installed. Prop shop said they have a larger surface area so they recommended less pitch to maintain the same RPM's. I did not have a spare set and as you know they are a uncommon size. It took 120 days to get them. Hope this helps, I have dd8v71ti.
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09-13-2021 12:53 AM #6
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09-16-2021 11:03 PM #7Registered Member
- Join Date
- Dec 2015
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- 18
Re: 53MY Original Props Cup?
I got them on board tonight, I will let you know next year, May some time. Too late in the season for haul out. I need to make some a stand of some sort in my starboard engine room for storage of them. I need more weight on that side of the boat.