Saintly Fish Posted October 6, 2022 Posted October 6, 2022 An interesting video this. I wonder if it would perform as well on my semi D hull? https://boattest.com/article/boattest-review-sharrow-propeller?utm_medium=email&_hsmi=228646611&_hsenc=p2ANqtz-_o7_6s94xTdGfQ7yChmhU2i-IDMi-DWXn46a9iCgJqL2ZdbKraqAudr4mcMpWbLw9I4F-gAosdSRj-05Y1zn-E_Oe2KQ&utm_content=228646611&utm_source=hs_email Andy135 1 Quote
Andy135 Posted October 6, 2022 Posted October 6, 2022 Very interesting. Could be the next big thing in prop design. No reason why it wouldn't work on your hull - more torque and better fuel consumption are relevant for all hull designs I'd have thought. Quote
Saintly Fish Posted October 6, 2022 Author Posted October 6, 2022 20 minutes ago, Andy135 said: Very interesting. Could be the next big thing in prop design. No reason why it wouldn't work on your hull - more torque and better fuel consumption are relevant for all hull designs I'd have thought. Yes, just depends how long it would take to claw back the initial outlay though. Sure as eggs is eggs the new design won't be cheap. Quote
captin slows old outlaw Posted October 6, 2022 Posted October 6, 2022 it . dose sound interesting but i agree it going to cost a lot.i believe that cost over savings will be the main factor, but if i have got right there would be less stress on bearings. oh i forgot to menshion bragging rights Quote
Odyssey Posted October 6, 2022 Posted October 6, 2022 I can’t but help but think that this doesn’t work…. If you looks around the world for all boats over the last 100 years they’ve had a similar prop deign…. It’s just nagging in the back of my mind that if a change in prop design that could up the capability it would of been done by now…. Quote
Saintly Fish Posted October 6, 2022 Author Posted October 6, 2022 6 minutes ago, Odyssey said: I can’t but help but think that this doesn’t work…. If you looks around the world for all boats over the last 100 years they’ve had a similar prop deign…. It’s just nagging in the back of my mind that if a change in prop design that could up the capability it would of been done by now…. Well only if somebody had thought about it. I'm sure different blade shapes have been tried, but this effectively gives you 6 blades from 3. And less drag. Quote
Andy135 Posted October 6, 2022 Posted October 6, 2022 49 minutes ago, Odyssey said: I can’t but help but think that this doesn’t work…. If you looks around the world for all boats over the last 100 years they’ve had a similar prop deign…. It’s just nagging in the back of my mind that if a change in prop design that could up the capability it would of been done by now…. But look at the high bar to arrive at the design they found. It took millions of dollars of investment and years of testing, which is probably why no-one has done it before. Besides, they didn't have 3D printed prototyping capabilities nor the ability to manufacture that complex shape 100 years ago. Quote
Andy135 Posted October 6, 2022 Posted October 6, 2022 1 hour ago, Saintly Fish said: Yes, just depends how long it would take to claw back the initial outlay though. Sure as eggs is eggs the new design won't be cheap. Erm, no. Definitely not cheap... 😲 Quote
Saintly Fish Posted October 6, 2022 Author Posted October 6, 2022 30 minutes ago, Andy135 said: Erm, no. Definitely not cheap... 😲 Yeah i saw that just now. Also, they only make props for outboards. So, it's down to you and @Odysseyto field trial on behalf of the others with petrol outboards!! Quote
GPSguru Posted October 6, 2022 Posted October 6, 2022 7 hours ago, Saintly Fish said: An interesting video this. I wonder if it would perform as well on my semi D hull? https://boattest.com/article/boattest-review-sharrow-propeller?utm_medium=email&_hsmi=228646611&_hsenc=p2ANqtz-_o7_6s94xTdGfQ7yChmhU2i-IDMi-DWXn46a9iCgJqL2ZdbKraqAudr4mcMpWbLw9I4F-gAosdSRj-05Y1zn-E_Oe2KQ&utm_content=228646611&utm_source=hs_email Considering that the video was made in Oct 2019, if these props are so damn good, then why in 2022 isn't it a standard fitment and a 'boating household name' I guess there are more 'cons' than what meets the eye. I will stick with my Mercury Revolution 4 prop, however, they come in at £800 each, so also, not cheap. Quote
Andy135 Posted October 6, 2022 Posted October 6, 2022 1 hour ago, GPSguru said: if these props are so damn good, then why in 2022 isn't it a standard fitment and a 'boating household name' The price may have something to do with it... GPSguru, suzook12 and Saintly Fish 3 Quote
Saintly Fish Posted October 7, 2022 Author Posted October 7, 2022 Sharrow tech team emailed me yesterday after I enquired (just out of boredom) if they did a shaft drive version. They said no and that they only make main stream props for outboards. But, if I wanted to get one designed to match my original prop then they would be happy to do it for me, starting with a chat over the phone to gain some info on use of boat, speeds and what I'd like to achieve, ie less fuel, better low speed planning or higher wot speeds. This sounded great, and all for the measly sum of approx $35-70K !!! Quote
Andy135 Posted October 7, 2022 Posted October 7, 2022 44 minutes ago, Saintly Fish said: Sharrow tech team emailed me yesterday after I enquired (just out of boredom) if they did a shaft drive version. They said no and that they only make main stream props for outboards. But, if I wanted to get one designed to match my original prop then they would be happy to do it for me, starting with a chat over the phone to gain some info on use of boat, speeds and what I'd like to achieve, ie less fuel, better low speed planning or higher wot speeds. This sounded great, and all for the measly sum of approx $35-70K !!! Bargain! When are they calling you? Quote
Geoff Posted October 7, 2022 Posted October 7, 2022 17 hours ago, Saintly Fish said: Sure as eggs is eggs the new design won't be cheap. I think that Jon will now realise Neil would be no good as a proof reader, he still needs to learn the very basic rules of grammar. Geoff.😉 suzook12 1 Quote
Saintly Fish Posted October 7, 2022 Author Posted October 7, 2022 1 hour ago, Andy135 said: Bargain! When are they calling you? Scheduled for 1pm Thursday 13th October 3021 Geoff 1 Quote
Saintly Fish Posted October 7, 2022 Author Posted October 7, 2022 4 minutes ago, Geoff said: I think that Jon will now realise Neil would be no good as a proof reader, he still needs to learn the very basic rules of grammar. Geoff.😉 Back on duty after your suspension Geoff? Quote
Odyssey Posted October 7, 2022 Posted October 7, 2022 16 hours ago, Andy135 said: But look at the high bar to arrive at the design they found. It took millions of dollars of investment and years of testing, which is probably why no-one has done it before. Besides, they didn't have 3D printed prototyping capabilities nor the ability to manufacture that complex shape 100 years ago. To be fair a lot of prop design is done via CFD. You will conduct a full flow analysis of the prop before you even cut metal… Given the R&D budget that Yamaha, Merc, Suzuki have to deal with and the time they will spend looking for every percentage point of economy improvement in their engines it makes me wonder why none of them have thought of this… As long as the concept has a patent on it they can publish results to back up the claims…. Just seems a bit like snake oil to me…. GPSguru 1 Quote
Andy135 Posted October 7, 2022 Posted October 7, 2022 30 minutes ago, Saintly Fish said: Scheduled for 1pm Thursday 13th October 3021 I'd be impressed if you're still boating by then Neil. Quote
Andy135 Posted October 7, 2022 Posted October 7, 2022 1 minute ago, Odyssey said: To be fair a lot of prop design is done via CFD. You will conduct a full flow analysis of the prop before you even cut metal… Given the R&D budget that Yamaha, Merc, Suzuki have to deal with and the time they will spend looking for every percentage point of economy improvement in their engines it makes me wonder why none of them have thought of this… As long as the concept has a patent on it they can publish results to back up the claims…. Just seems a bit like snake oil to me…. 78 patents awarded apparently, with more in the pipeline. They publish their (market-facing) data here: https://www.sharrowmarine.com/about and also in the article that Neil posted. I know what you mean - seems too good to be true. But then again, if/when Sharrow gain market traction and volumes go up/prices come down we may see all new outboards running with these props as standard. Time will tell. Saintly Fish 1 Quote
Saintly Fish Posted October 7, 2022 Author Posted October 7, 2022 1 hour ago, Andy135 said: I'd be impressed if you're still boating by then Neil. Gives me time to save !! Andy135 1 Quote
Odyssey Posted October 7, 2022 Posted October 7, 2022 4 hours ago, Andy135 said: 78 patents awarded apparently, with more in the pipeline. They publish their (market-facing) data here: https://www.sharrowmarine.com/about and also in the article that Neil posted. I know what you mean - seems too good to be true. But then again, if/when Sharrow gain market traction and volumes go up/prices come down we may see all new outboards running with these props as standard. Time will tell. Patents are great though….. I mean you can patent any original idea, it doesn’t need to work…. It’s quite amusing when I’m doing an IP review for work and some of stuff that people have patented that just will never work is amazing…. if I win the lottery I’ll buy a pair for Odyssey and let you know how I get on 😜😜😜😜 GPSguru 1 Quote
JDP Posted October 10, 2022 Posted October 10, 2022 I looked at these a few years ago but back then there were no reviews from real people who had bought and used them, seems much the same now. Quote
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