Propeller size , could someone help me out

[bobs]

On my Jeanneau 40DS I have a 3 blade propeller that has one blade off set , I therefor would like to replace the prop. but don't seem to find the right specs .
On the picture you see the markings ' OTE 13R Radice ' , and that's about it I could find .
I'm sure more boaters navigate with this type of propeller , does anyone know the exact specifics so I can order a new one and have it ready for the next haul out .
I contacted Eliche Radice the manufacturer but no reply .



Thanks

[Pete7]

Bobs, Eliche Radice are I think an Italian firm. I have previously tried to buy directly from them, but they refused and directed me to the UK importer.

Given you're in the EU, you might try contacting Sillette who are the UK importer and normally very helpful:

https://www.sillette.co.uk/propeller...ion_index.html

[paulajayne]

Internet search gat this:-

For the Jeanneau Sun Odynney 40 with a Yanmar 4JH3E (55 HP by 3800 RPM, reduction 1:2,63) we would recommend a 3-blade 18x13-3R propeller

Read more: Propeller for Sun Odyssey 40 | Jeanneau Owners Forum

[bobs]

Thanks Pete , will contact them .

Paul , would that mean the number 13 on my prop. stands for the pitch and NOT the diameter ?

Thanks

[Pete7]

Yes, for the prop Paul has quoted it is: diameter 18", pitch 13", number of blades 3 and rotation Right hand.

Pete

[bobs]

Wow , I just got an answer from Silette after giving them the details of my boat like length , engine , gearbox etc.
This is what they suggest.

" We therefore propose an ELICHE RADICE E13 3 blade propeller with a 52% DAR
(standard turbine propeller) size 22 X 18 RH. "

I have the feeling that the number OTE 13 has nothing to do with diameter or pitch but the ... E13 refers to the type of propeller . Not sure what the ' OT ' stands for though .
The mist is clearing up Pete , thanks for the Silette-link .

Regards

[mvmojo]

General rule of thumb is to swing the largest diameter prop that will fit and then pitch it to achieve max (or near max) rpm with a clean bottom. This gives maximum efficiency. To determine the diameter, measure from center of the prop shaft to top of deadwood Double this number then deduct 10% and that's your diameter. Pitch is somewhat hit and miss but there are calculators out there based on LWL, HP, displacement, etc. If you can't achieve max rpm you're pitched too much and are overloading the engine. If over-reving, you need more pitch. In very general terms, each inch of pitch is worth around 200 rpm. Dave Gerr has an excellent reference book on prop selection, "The Propeller Handbook".

[billknny]

Having one blade a bit (or a lot!) bent is not a good reason to buy a new prop! Any good prop shop can straighten and rebalance this and have it as good as new for a fraction of the cost.

I have seen some truly amazing repairs done on props. You owe it to your wallet to look into repair instead of replacement.

[Compass790]

Wot post no. 8 says. Way cheaper to repair. You can check on the vicprop calc ( google it)for pitch & dia

[Marc1]

Originally Posted by billknny

Having one blade a bit (or a lot!) bent is not a good reason to buy a new prop! Any good prop shop can straighten and rebalance this and have it as good as new for a fraction of the cost.

I have seen some truly amazing repairs done on props. You owe it to your wallet to look into repair instead of replacement.

My thoughts precisely, they can even change the pitch within reason

[Gruz]

try this one....


https://www.elicheradice.com/product...ze-propellers/


https://www.sillette.co.uk/documents...ellers_000.pdf

[EWOL Props]

Originally Posted by mvmojo

General rule of thumb is to swing the largest diameter prop that will fit and then pitch it to achieve max (or near max) rpm with a clean bottom. This gives maximum efficiency. To determine the diameter, measure from center of the prop shaft to top of deadwood Double this number then deduct 10% and that's your diameter. Pitch is somewhat hit and miss but there are calculators out there based on LWL, HP, displacement, etc. If you can't achieve max rpm you're pitched too much and are overloading the engine. If over-reving, you need more pitch. In very general terms, each inch of pitch is worth around 200 rpm. Dave Gerr has an excellent reference book on prop selection, "The Propeller Handbook".

Well...sorry to say this, but this is not the way you should run a correct propeller sizing as you could incur in too high peripheral speed, cavitation and noise.
To correctly size your prop there are some tools available on the net, should you like to use ours, you can find it here Calculate your propeller
Recommended distance to the hull is 15% of the diameter, in case of small aperture the minimum should be 12%

[Gruz]

Originally Posted by EWOL Props

To correctly size your prop there are some tools available on the net, should you like to use ours, you can find it here Calculate your propeller

O.K, but why I have to give you my... Name, Surname, E-mail, Telephone, Country...just to calculate propeller size for my boat.

For heaven sake people (companies, businesses), what is wrong with you. Just wont to check propeller size, not asking for bone marrow donor. What you are going to ask next, my PIN number and bank account details.

[RaymondR]

Originally Posted by Gruz

O.K, but why I have to give you my... Name, Surname, E-mail, Telephone, Country...just to calculate propeller size for my boat.

For heaven sake people (companies, businesses), what is wrong with you. Just wont to check propeller size, not asking for bone marrow donor. What you are going to ask next, my PIN number and bank account details.

Anyone know of a propeller manufacturer in Nigeria??

[Marc1]

Originally Posted by Gruz

O.K, but why I have to give you my... Name, Surname, E-mail, Telephone, Country...just to calculate propeller size for my boat.

For heaven sake people (companies, businesses), what is wrong with you. Just wont to check propeller size, not asking for bone marrow donor. What you are going to ask next, my PIN number and bank account details.

I agree. Common practice with most websites who give you some little thing and in turn harvest as much as possible for their data bank for alternative purposes, be it genuine commercial or less genuine we don't know.

Either avoid, or give fake information. My date of birth is usually 01/01/1991 and my email eatmyshirt@google.com.mn