MapisM
Well-known member
Also agreed.
All good reasons that make sofware estimations even less reliable, I reckon...
Super quiet generator
- Thread starter Lozzer
- Start date
All good reasons that make sofware estimations even less reliable, I reckon...
Lozzer
Member
ARE totally agree about the quality of the installation. I was on an Oyster 100 last year and it was only when I opened the engine room door that I realised we were not on shore power, both gensets were running. If I am using the generators on the P85 you know about it.
I am at Oyster factory in September, hopefully they will have a finished boat in the water that we can run the genny on. It wont be a 745 as we are the first of its kind but it will give me an idea of how well they install the product.
Also noise is different for everyone. for instance at home I can sleep through anything on the boat I hear a pin drop, i guess you tune in and out.
I am at Oyster factory in September, hopefully they will have a finished boat in the water that we can run the genny on. It wont be a 745 as we are the first of its kind but it will give me an idea of how well they install the product.
Also noise is different for everyone. for instance at home I can sleep through anything on the boat I hear a pin drop, i guess you tune in and out.
Forty_Two
Well-known member
Installation is most important. Easy enough to insulate against the air- borne noise within the installed space, it's the sound transmitted through the structure that defines the noise levels outside the installed space.
Physical isolation is the only way, the best being a soft mounted sub floor for the Geny to sit on. I believe most manufacturer's can supply data for the flexibility needed to ensure no additional resonances are setup which would just make it louder still.
Sound studios have a floating floor with the studio structure built on top so nothing bridges the gap. That's what you need to get as close to as possible.
My Onan 11 kw has an excellent sound shield, all the noise I hear comes thru the structure as I didn't take my own advice .:nonchalance:
Love the Onan though, quality kit.
Physical isolation is the only way, the best being a soft mounted sub floor for the Geny to sit on. I believe most manufacturer's can supply data for the flexibility needed to ensure no additional resonances are setup which would just make it louder still.
Sound studios have a floating floor with the studio structure built on top so nothing bridges the gap. That's what you need to get as close to as possible.
My Onan 11 kw has an excellent sound shield, all the noise I hear comes thru the structure as I didn't take my own advice .:nonchalance:
Love the Onan though, quality kit.
Lozzer
Member
Agreed on installation and quality of product.
The Oyster 100 has a floating floor hence the ability to minimize noise through vibration. I as poke to Oyster about putting softer mounts and they will look into it. Go to soft and as you say it brings in another resonance.
Joys of boat building. A nice joy though.
Is your Onan 11 powerful enough. Could you have got by with some smaller for night use only. Couple of aircon units plus batt charges..
The Oyster 100 has a floating floor hence the ability to minimize noise through vibration. I as poke to Oyster about putting softer mounts and they will look into it. Go to soft and as you say it brings in another resonance.
Joys of boat building. A nice joy though.
Is your Onan 11 powerful enough. Could you have got by with some smaller for night use only. Couple of aircon units plus batt charges..
Forty_Two
Well-known member
Our chilled water aircon has a single 36k BTU compressor & the 11 kw copes easy. It replaced a 6 kw which was not enough. Having since installed a 3 kw Victron Multi plus with 1,100Ah AGM batteries I reckon the old 6 kw would have been ok, but that is only a guess.
I installed a separate 4k btu aircon unit for night use in the aft cabin which can run of the invertor. Good for night use & backup, though after 13 years we have adapted to the heat & don't use the a/c so much now.
I installed a separate 4k btu aircon unit for night use in the aft cabin which can run of the invertor. Good for night use & backup, though after 13 years we have adapted to the heat & don't use the a/c so much now.
MarieK
Member
Bit of thread drift but could I ask Lozzer what are the difference from a crewing perspective for the Oyster vs the P85? Also with regard to helming can you just switch from power to sail or are you having to "learn". Forgive me if your a previous americas cup winner or something...
Lozzer
Member
Hi MarieK
We are setting the Oyster up for short handed sailing so min 2 people max 6. There will only be 8 berths in 5 cabins. 1 cabin is actually a workshop utility room.
The P85 we can run with 2 people it helps if the second person knows what they are doing. For instance the boss and I often go out, if conditions are easy he will moor if they are difficult I will more it and one in position he will hold on station whilst I do the lines. We know our boat pretty well as we generally cover 6000 nm per summer. not bad for 10 - 12 weeks. keeping it clean is a different challenge.
I grew up sailing so am happy on either. Having said that I havent skippered many 75' I have been first mate on an Atlantic crossing on a 48m and done a few deliveries on a C&N 95. Time will tell I ghuess.
Still I am looking forward to the new challenge as well as the build process...
We are setting the Oyster up for short handed sailing so min 2 people max 6. There will only be 8 berths in 5 cabins. 1 cabin is actually a workshop utility room.
The P85 we can run with 2 people it helps if the second person knows what they are doing. For instance the boss and I often go out, if conditions are easy he will moor if they are difficult I will more it and one in position he will hold on station whilst I do the lines. We know our boat pretty well as we generally cover 6000 nm per summer. not bad for 10 - 12 weeks. keeping it clean is a different challenge.
I grew up sailing so am happy on either. Having said that I havent skippered many 75' I have been first mate on an Atlantic crossing on a 48m and done a few deliveries on a C&N 95. Time will tell I ghuess.
Still I am looking forward to the new challenge as well as the build process...