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Post by GO30 on May 7, 2024 18:20:27 GMT 12
Which ones would you buy if you had to tomorrow?
45ft Sailing Cat.
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Post by Fogg on May 7, 2024 19:28:57 GMT 12
Maxprop.
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Post by ComfortZone on May 7, 2024 19:33:04 GMT 12
Maxprops are old tech and quite inefficient due to their flat blades. The 3 blade geared folders, Varifold (which CZ has, as does Parlay Revival) or Flexofold are the way to go |
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Post by Cantab on May 7, 2024 20:27:14 GMT 12
Flexofold
Bought 2 already, would buy another without question.
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Post by GO30 on May 8, 2024 12:03:09 GMT 12
Nice.
Any thoughts change if I say it is a charter boat?
Gori props. Any thoughts?
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Post by Fogg on May 8, 2024 12:50:21 GMT 12
I’ve never had much problem with going forwards. It’s reversing and stopping power that I’ve always found more important because those are the manoeuvres that tend to be most challenging. As opposed to motoring straight ahead. So here are some facts (the best propeller comparison ever done and still regarded as the gold standard). You’ll see why I personally like Maxprop for reversing & stopping power. And although it scores lower than Flexofold for forward speed, I still get hull speed (just under 9kts) at WOT. www.yachtingmonthly.com/gear/folding-and-feathering-propeller-test-29807 |
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Post by fish on May 8, 2024 13:10:30 GMT 12
Nice. Any thoughts change if I say it is a charter boat? Gori props. Any thoughts? If it is a charter cat, I'd put fixed blades on it. Charterers unfamiliar with the boat are going to need max control (forward and reverse) getting onto the fuel berth, or out of and back into their marina berth. The amount of damage caused by charterers at fuel berths is comical (if you aren't paying for it). And fixed blades are cheaper. And charterers wont know or understand the sailing performance difference of a fixed blade prop. They rent pie-boats for a reason. Space, volume and number of bedrooms, not sailing ability. Otherwise you need a prop that works properly in reverse. I would say a kiwiprop cause they have very good bite in reverse, but the level of maintenance needed is probably not appropriate for a charter operation set up. |
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Post by Fogg on May 8, 2024 13:20:19 GMT 12
That’s probably the best advice from fish all year. 😊
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Post by ComfortZone on May 8, 2024 21:34:26 GMT 12
I’ve never had much problem with going forwards. It’s reversing and stopping power that I’ve always found more important because those are the manoeuvres that tend to be most challenging. As opposed to motoring straight ahead. So here are some facts (the best propeller comparison ever done and still regarded as the gold standard). You’ll see why I personally like Maxprop for reversing & stopping power. And although it scores lower than Flexofold for forward speed, I still get hull speed (just under 9kts) at WOT. www.yachtingmonthly.com/gear/folding-and-feathering-propeller-test-29807The issue with going forwards with your Max's relative inefficiency is that you are paying for it in your fuel bill (maybe not a big deal) but also in your range, which is a big deal when passaging offshore where you could be motoring for some days on end and diesel is not so easy to refuel. Never had a problem with CZ's 3 blade Varifold pulling her up or backing out of a marina fairway, probably helped by its 525mm (21") diameter which has plenty of bite. |
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Post by fish on May 9, 2024 9:27:51 GMT 12
I’ve never had much problem with going forwards. It’s reversing and stopping power that I’ve always found more important because those are the manoeuvres that tend to be most challenging. As opposed to motoring straight ahead. So here are some facts (the best propeller comparison ever done and still regarded as the gold standard). You’ll see why I personally like Maxprop for reversing & stopping power. And although it scores lower than Flexofold for forward speed, I still get hull speed (just under 9kts) at WOT. www.yachtingmonthly.com/gear/folding-and-feathering-propeller-test-29807That is an interesting article. My kiwiprop scores lowest for top speed, which has got me thinking about spending boat dollars. The Brunton's Autoprop sounds fantastic, but I simply don't understand how it works. We can't use folders due to the space between the prop and the rudder, hence feathering only. |
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Post by em on May 9, 2024 10:20:26 GMT 12
Nice. Any thoughts change if I say it is a charter boat? Gori props. Any thoughts? If it is a charter cat, I'd put fixed blades on it. Charterers unfamiliar with the boat are going to need max control (forward and reverse) getting onto the fuel berth, or out of and back into their marina berth. The amount of damage caused by charterers at fuel berths is comical (if you aren't paying for it). And fixed blades are cheaper. And charterers wont know or understand the sailing performance difference of a fixed blade prop. They rent pie-boats for a reason. Space, volume and number of bedrooms, not sailing ability. Otherwise you need a prop that works properly in reverse. I would say a kiwiprop cause they have very good bite in reverse, but the level of maintenance needed is probably not appropriate for a charter operation set up. Depends on the gearbox . I have a fixed prop and replaced the gearbox last year . The old box was a model prone to clutch damage if left in neutral/freewheeling while sailing . New box has hydraulic clutch so no problems freewheeling . |
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Post by Fogg on May 9, 2024 16:51:02 GMT 12
I’ve never had much problem with going forwards. It’s reversing and stopping power that I’ve always found more important because those are the manoeuvres that tend to be most challenging. As opposed to motoring straight ahead. So here are some facts (the best propeller comparison ever done and still regarded as the gold standard). You’ll see why I personally like Maxprop for reversing & stopping power. And although it scores lower than Flexofold for forward speed, I still get hull speed (just under 9kts) at WOT. www.yachtingmonthly.com/gear/folding-and-feathering-propeller-test-29807The issue with going forwards with your Max's relative inefficiency is that you are paying for it in your fuel bill (maybe not a big deal) but also in your range, which is a big deal when passaging offshore where you could be motoring for some days on end and diesel is not so easy to refuel. Never had a problem with CZ's 3 blade Varifold pulling her up or backing out of a marina fairway, probably helped by its 525mm (21") diameter which has plenty of bite. At WOT I hit hull speed. Which is how it should be. At cruising speed I’m just on the cusp of the benchmark 75-80% mark which is what you want for distance motoring. All of which means I’m geared perfectly and run at the right revs for my usage. If I geared higher, I would achieve my target speeds at far too low rpm meaning my turbo is no longer spinning. Which is bad. Which is why I’m happy with my Maxprop setup! 😊 |
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Post by chariot on May 10, 2024 9:42:57 GMT 12
I had a Gori 3 blade on my last boat and it was great in forward but walked quite a bit in reverse. Seemed to stop ok. When I repowered, Volvo wouldn't warranty the engine with the Gori prop as it couldn't achieve max revs due to being a high thrust prop. Ended up over a barrel and had to put a Volvo prop on. It is now an ornament in the garden.
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Post by Fogg on May 10, 2024 13:27:00 GMT 12
Which is the ornament - Gori or Volvo?
I had a Volvo prop and really disliked it. Big astern prop walk and stopping and reversing power almost non-existent. I used to joke that when I hit reverse it felt like the prop had fallen off. But in fwd it drove the boat like a nuclear reactor.
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Post by chariot on May 10, 2024 14:41:57 GMT 12
Never had a problem with the Volvo engines I've had. The Volvo prop didn't have anywhere near the grunt in forward or reverse that the Gori had.
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