Nanni hydraulic refit

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nauticalnomad

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I have just ordered a Brand new nanni 43HP engine with Hydraulic propulsion to replace my aged 4107. I have not made the transaction as yet but...
Has anyone else made this choice or any insight into it.
power loss etc compared between shaft and hydraulics etc?
prop sizing?
pros and cons?
install problems?
 
nauticalnomad said:
I have just ordered a Brand new nanni 43HP engine with Hydraulic propulsion to replace my aged 4107. I have not made the transaction as yet but...
Has anyone else made this choice or any insight into it.
power loss etc compared between shaft and hydraulics etc?
prop sizing?
pros and cons?
install problems?
Click to expand...

I have the Nanni 4150HE with a PRM 120 box
it replaced a Perkie 4108 with a TMP hydraulic box
the Nanni has more torque i had to increase the pitch of the MaxProp to get down to 3000 rpm
 
sailorman said:
I have the Nanni 4150HE with a PRM 120 box
it replaced a Perkie 4108 with a TMP hydraulic box
the Nanni has more torque i had to increase the pitch of the MaxProp to get down to 3000 rpm
Click to expand...

Yeah Roger,
Ive ordered the 43HP engine, to power a Hydraulic drive,
I am getting rid of a vee drive so the hydraulic option was best.
But theres a powerloss between the engine and the hydraulics,
The 4107 is i think around 45hp etc, but im not sure if it is going to be noticable between the hydraulic and vee drive set up or it may be the same as with the Perkins,
bearing in mind the perkins was 45 yrs old and this nanni is brand new etc
 
Hydraulic power transmission will lose you 20-40% depending on the quality of the pump and motor and the hose installation. The pump and motor pairing should have a basic power loss or efficiency number associated with it; has the supplier not given you a data sheet? Given the price premium you may be paying I'd want to see data sheets before committing financially. Have you considered electric transmission?
 
nauticalnomad said:
Yeah Roger,
Ive ordered the 43HP engine, to power a Hydraulic drive,
I am getting rid of a vee drive so the hydraulic option was best.
But theres a powerloss between the engine and the hydraulics,
The 4107 is i think around 45hp etc, but im not sure if it is going to be noticable between the hydraulic and vee drive set up or it may be the same as with the Perkins,
bearing in mind the perkins was 45 yrs old and this nanni is brand new etc
Click to expand...

it depends on the speed the perkie runs at
48 hp fell revs
rated 38 hp at 3000 (that is the commercial rating)
The chap who used to run Foxs electronics fitted a 43 with hyd drive into his Nic 43
 
penfold said:
Hydraulic power transmission will lose you 20-40% depending on the quality of the pump and motor and the hose installation. The pump and motor pairing should have a basic power loss or efficiency number associated with it; has the supplier not given you a data sheet? Given the price premium you may be paying I'd want to see data sheets before committing financially. Have you considered electric transmission?[/QUOTE

Electric transmission would require a load of batteries im guessing?
Click to expand...
 
Or a diesel generator creating a hybrid drive system. The genny then also power on board equipment and can be much better soundproofed than a diesel used for propulsion, plus it's position and orientation can be placed to suit. A typical hybrid system will use a very small number of batteries to allow silent running for short distances such as getting in and out of a marina. This in turns saves starting up and running a large diesel for just a short time, the fact that you have a battery bank in effect then creates a wing engine so that if the genny fails you have propulsion for the last few miles to port. Prices are higher for all these benefits but the development of hybrid systems for automotive use is reducing the cost differential.
 
A diesel electric system would usually require a battery bank of some kind, but there are systems that do without and even the conventional systems can be run with a fairly small battery bank depending on what the typical useage is going to be. Have you considered getting your existing V-drive reconditioned and fitted to a new engine? New V-drives are available; I assume they are less suitable through having a different included angle, forcing the engine to sit at a steeper pitch?

It's a bit confusing having to follow 3 different threads on the same topic; was that quite necessary?
 
penfold said:
A diesel electric system would usually require a battery bank of some kind, but there are systems that do without and even the conventional systems can be run with a fairly small battery bank depending on what the typical useage is going to be. Have you considered getting your existing V-drive reconditioned and fitted to a new engine? New V-drives are available; I assume they are less suitable through having a different included angle, forcing the engine to sit at a steeper pitch?

It's a bit confusing having to follow 3 different threads on the same topic; was that quite necessary?
Click to expand...

I was after as much info as possible, i didnt think everyone read all forums,
Some people with motor boats are snobs when it comes to yacht people....
 
sailorman said:
Some people with motor boats are snobs when it comes to yacht people

Its only Cos you dont wave to them :p
Click to expand...

I was being sarcastic...
Ive got both, And i get far too many people shouting obscenities at me in my zapcat than i ever did whilst sailing,
Especially that bloke in that orange rib from Levington that is always cruising up and down the orwell with the helmet on and the 2way radio strapped to his head like its his river
 
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