Recommendations for Prop for DP-M 1.95

[AMMO DAWG]

First off my deepest condolences to friends and families of Don, he has given me advice that has been invaluable, he is greatly missed. I have a 24 foot Rinker Flotilla I have been re-powering with a Marine Power 5.7 and swapping to a Volvo outdrive DP-M 1.95 gear ratio as Don had recommended. I will use the boat for cruising and occasional tubing, skiing etc. Bot weighs around 3,500 lbs from what I could research. Any advice on which prop might work best, I have seen numbers like C-5, C-6 when looking for them. Any insight would be greatly appreciated.

AD

 

[Maclin]

Re: Recommendations for Prop for DP-M 1.95

The C5 to C6 range is in the ballpark. If the cruises are short and seeing that you want to tube and ski I would go with a C5 set. A C6 set would probably allow you to tow also, just depends on how strong the 5.7 is. With a 24 footer the C5 is where I would start.

 

[saintlee]

Re: Recommendations for Prop for DP-M 1.95

I switched from a sx-m to a dp-m a couple years back. It also has the 1.95 gear ratio. my boat is a glastron 24 foot with a 5.0 carbed.
I started with a f-5 prop set but had to switch to a f-4 to get with in the max rpm range. I used the F series because i wanted stainless steel whitch has much less prop flex. You will love the dp if you switched from a single prop. Being with in the max rpm range for your engine, is what should determine the prop size.

 

[Maclin]

Re: Recommendations for Prop for DP-M 1.95

Saintlee brought up a point that I may have missed, and that is exactly what drive you have. The DuoProp C series is stainless steel for 280DP,290DP, DP-A/B/C . I am not familiar enough with the DP-M designation, it may use the F series stainless and D series aluminum rather than the B aluminum and C stainless.

I do think Saint's experience with the "number" is very telling though, as I believe the number in the series for pitch correlates between all the A/B/C/D/F series props. By this I mean a C4 or F4 depending on your exact drive, may be the better choice of where to start rather than the C5 I mentioned.

In my mind I made the assumption you had a DP-A/B/C drive which use the A or B series aluminum or C series stainless.

 

[saintlee]

Re: Recommendations for Prop for DP-M 1.95

My glastron weight dry is around 4500 lbs with a 5.0 carbed engine.
So a 3500 lb boat with a 5.7 (presumably fuel injected ) would start with a f5 or d5 in my opinion.
Just remember to stay within proper rpms at wot.
Good luck

 

[Maclin]

Re: Recommendations for Prop for DP-M 1.95

My boat is about that weight (3,500) 22 foot Cuddy with 5.7. It can turn B7's but I prefer to run the B5's as we are usually loaded and towing.

I am not familiar with a Flotilla deck boat, but at 24 feet it just "sounds" heavier than 3,500

 

[Maclin]

Re: Recommendations for Prop for DP-M 1.95

AMMO DAWG,

Did we ever find out what drive you have? I have attached a chart of Volvo Penta drive profiles with some specs.

 

[AMMO DAWG]

Re: Recommendations for Prop for DP-M 1.95

Thanks for all the outstanding advice, sorry for the slow response been away for a few days. I currently have a Volvo SX-M 1.60, this is really the wrong gear ratio for the boat. I was able to pick up a good DP-SM 1.95 lower unit. Saintlee, you could be right about the weight, very little info is available about the boat, it is a tri-cat design deck boat. I found some other posts from folks who had the same boat and made claims of a 3500 lb empty weight so that is my basis for the weight. We have a place up the street with a truck scale, when I get her put back together I will run it on the scales and see what i get. The engine is a 2006 marine Power 5.7 fuel injected engine I resurrected from a barn and have gone through end to end. Sounds like the F5 might be a good choice for all around performance. Want to get this right cause them props can sure can get expensive. Thank again for the quick responses and sound advice.