Correct Propeller size

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   Dear All,
I have currently a Volvo MD 2030 29 hp @ 3.600 rpm with a MS25 reducing 2.47:1 driving a 16 inch 2 blade flexofold folding prop with unknown pitch.

I want to upgrade to a 3 blade flexofold folding prop.
As an option I will at the same time upgrade to a Volvo MD 2040 40 hp @ 3.600 rpm with same 2.47:1 MS25.

after goimg through all posts I could find but I am still a little bit confised… and even more confusing flexofold offers for the 40 hp option a 17x11 3 blade prop. I understood that some of you uses such size for 29 hp. after a longer discussions with flexofold headquarter they still confirm 17x11 for 40 hp. unfortunately I dif not ask for 29 hp to get an comparison.

Easiest for my issue would be to give your recommendations of prop sizes for 

a: 29 hp
b: 40 hp

Hope to get so,e answers from your swarm intelligence.

Best regards
Robert

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Paule70 Members Profile Send Private Message Find Members Posts Add to Buddy List Sub Lieutenant Joined: 11 July 2016 Location: Germany Status: Offline Points: 15	Post Options Post Reply Quote Paule70 Report Post Thanks(0) Quote Reply Topic: Correct Propeller size Posted: 24 March 2022 at 21:40
	Dear All, I have currently a Volvo MD 2030 29 hp @ 3.600 rpm with a MS25 reducing 2.47:1 driving a 16 inch 2 blade flexofold folding prop with unknown pitch. I want to upgrade to a 3 blade flexofold folding prop. As an option I will at the same time upgrade to a Volvo MD 2040 40 hp @ 3.600 rpm with same 2.47:1 MS25. after goimg through all posts I could find but I am still a little bit confised… and even more confusing flexofold offers for the 40 hp option a 17x11 3 blade prop. I understood that some of you uses such size for 29 hp. after a longer discussions with flexofold headquarter they still confirm 17x11 for 40 hp. unfortunately I dif not ask for 29 hp to get an comparison. Easiest for my issue would be to give your recommendations of prop sizes for a: 29 hp b: 40 hp Hope to get so,e answers from your swarm intelligence. Best regards Robert
	Hanse 371 #129 Eckernförde, Germany

Paule70 Members Profile Send Private Message Find Members Posts Add to Buddy List Sub Lieutenant Joined: 11 July 2016 Location: Germany Status: Offline Points: 15	Post Options Post Reply Quote Paule70 Report Post Thanks(0) Quote Reply Posted: 25 March 2022 at 18:20
	@lucca I saw,in your signature that you use a 3 blade folding prop with a 40 hp Volvo. I would be happy to learn what size the prop is and whether you are happy with its characteristics. Thank you in advance. Greetings, Robert
	Hanse 371 #129 Eckernförde, Germany

lucca Members Profile Send Private Message Find Members Posts Add to Buddy List Lieutenant Joined: 15 May 2006 Location: Stralsund Status: Offline Points: 47	Post Options Post Reply Quote lucca Report Post Thanks(0) Quote Reply Posted: 03 April 2022 at 10:01
	Hi there I have an Volvo 18x13 3-blade folding propeller for my MD2040 40HP @3600rpm (Part no. 3581225). I am very satisfied with that. The engine does it easily. No wind and wave: @1800 rpm --> 5kn @2100 rpm --> 6kn I've never needed RPM's higher than 2600 rpm. Then the stern gets stuck in the water.
	371s #171, 40HP Volvo, 3-Blade FoldProp, Jefa RP150&DD1, RMC 185 4kW, Zeus2 9, V50, NAIS400, WR10, Victron MultiPlus 1600, 180W Solar, 150l Diesel, 300l H2O, Eberspächer 4kW, freezer ... ;)

karina Members Profile Send Private Message Find Members Posts Add to Buddy List Lieutenant Joined: 18 August 2009 Status: Offline Points: 48	Post Options Post Reply Quote karina Report Post Thanks(0) Quote Reply Posted: 20 April 2022 at 19:18
	Hi all, since 2014 I have a 17x12 2-blade flexofold propeller (MD2030, 29HP). The size was recommended by the flexofold "expert" on the Hanseboot exhibition. I'm very happy with this prop. approx. @2250 rpm --> 6kn approx. @2650 rmp --> 7kn full speed approx. @3000 rmp --> 8kn (no wind, no waves, clean hull) From my point of view, there is no need to upgrade to MD 2040. Better spend the money for fast sails ;-) BR, Rainer
	live slow - sail fast! S/Y Karina Hanse 371 #32 Hamburg / Germany



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