Rival 32. Folding prop

Congrats, forgive me but I have to ask though whether on an older cruising boat that's new to you are there not other things further up on the to do list that would benefit from being added or replaced? If there aren't or you've sufficient funds available anyway then you are indeed fortunate! :)
 
Not sure there is enough clearance between the prop and the skeg to fit a folding prop. A Feathering prop is much more suitable for the boat. However it is a big investment and almost certainly with an old boat there are better ways to spend the money. One of those things that you buy when you have run out of essential things to buy.
 
Tranona said:
Not sure there is enough clearance between the prop and the skeg to fit a folding prop. A Feathering prop is much more suitable for the boat. However it is a big investment and almost certainly with an old boat there are better ways to spend the money. One of those things that you buy when you have run out of essential things to buy.
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Sorry if you feel offended. You will get good advice here on most things. The thing about cost is just a general observation. Fancy props are a contentious subject and it is helpful to know what one hopes to achieve through fitting one. Just asking whether anybody has fitted one either invites a yes or no answer which is not very helpful or answers that try to set some context for a better reply.

What sort of advice were you expecting if you don't give any context except the type of boat?
 
jings, I would like to think I answered his question as set and guided him onwards.. he didn't want a general counselling session on how best to spend his cash, not surprised that some don't stay long on the forum with the unnecessarily sharp responses the OP received
 
Tranona said:
Not sure there is enough clearance between the prop and the skeg to fit a folding prop. A Feathering prop is much more suitable for the boat. However it is a big investment and almost certainly with an old boat there are better ways to spend the money. One of those things that you buy when you have run out of essential things to buy.
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On the off-chance that the OP is still around, the first part of the above is sensible advice. There's a lot of it around here, so it's worth sticking with it even if you do get your feathers ruffled once in a while.

Actually, so is the second part but, if the boat is seaworthy in every other respect and has decent white sails, it's a logical next step. There was an article about spinnakers and gennakers in one of the yottie comics a few years ago, and it was suggested that a feathering prop may be a better investment than either, because it works on all points of sail, not just off the wind. However, it's a fairly heavy boat, with a relatively small engine, so not a huge prop, which means the gains may not be as great as for a lighter boat with a bigger engine and prop.
 
Well, for those who are still around and interested. ?

As post 2, a lot of older classes, with small prop apertures, fit the Darglow feathering prop and they seem to be very well liked. God knows what they cost, all anyone will usually say is that they are "expensive". From this I assume over 2 grand and less than 3 but this is just a guess. Certainly a considered purchase.

.
 
doug748 said:
Well, for those who are still around and interested. ?

As post 2, a lot of older classes, with small prop apertures, fit the Darglow feathering prop and they seem to be very well liked. God knows what they cost, all anyone will usually say is that they are "expensive". From this I assume over 2 grand and less than 3 but this is just a guess. Certainly a considered purchase.

.
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For my CO32 it was in the region of £1200. Like many I tend not to remember the numbers - it helps retain sanity!
 
doug748 said:
Well, for those who are still around and interested. ?

As post 2, a lot of older classes, with small prop apertures, fit the Darglow feathering prop and they seem to be very well liked. God knows what they cost, all anyone will usually say is that they are "expensive". From this I assume over 2 grand and less than 3 but this is just a guess. Certainly a considered purchase.

.
Click to expand...
The Rival 32 does not have the prop in an aperture, but on a shaft log in front of a skeg. Suspect (as I suggested) there is not enough clearance for the folded blades of a folding prop. Irrespective of that a feathering propeller is probably more suitable for the boat, but far more information is needed before making any sort of recommendation. Have just ordered a Featherstream and there is far more to getting the right one than meets the eye. There are of course for some boats straightforward solutions because they only come with one engine/box option and there are well established "correct" sizes, particularly true of saildrives. For older boats that may have been re-engined or still have an original there could be a wide range of recommendations. It is a truism that deciding on how to power a boat starts with the propeller and working back to an engine and reduction box to power this. But for most thinking of buying a prop for an existing boat need to look for the best compromise to suit what they have.

I am lucky because I am fitting a new engine so we decided on the optimum prop size (17") first to just exceed hull speed. To drive this needs a minimum of 26hp and a shaft speed of around 1400rpm. How this is achieved depends on the make of engine and reduction box chosen, but I have ended up with Beta 30 (29hp) and a TMC 2.6:1 reduction. To fit the prop there is a cut out in the leading edge of the rudder to give clearance for the blades to turn.

If this is not enough complication a potential buyer still has to consider the different designs of prop on the market because they offer different benefits and if one is investing substantial sums in buying one (it is close to £2k for a 17" Featherstream) one needs to be clear what you expect from the prop. So a simple "has anyone fitted one" will only get a yes or no answer. Anything more requires more contextual information.
 
Tranona said:
The Rival 32 does not have the prop in an aperture, but on a shaft log in front of a skeg. Suspect (as I suggested) there is not enough clearance for the folded blades of a folding prop. Irrespective of that a feathering propeller is probably more suitable for the boat, but far more information is needed before making any sort of recommendation. Have just ordered a Featherstream and there is far more to getting the right one than meets the eye. There are of course for some boats straightforward solutions because they only come with one engine/box option and there are well established "correct" sizes, particularly true of saildrives. For older boats that may have been re-engined or still have an original there could be a wide range of recommendations. It is a truism that deciding on how to power a boat starts with the propeller and working back to an engine and reduction box to power this. But for most thinking of buying a prop for an existing boat need to look for the best compromise to suit what they have.

I am lucky because I am fitting a new engine so we decided on the optimum prop size (17") first to just exceed hull speed. To drive this needs a minimum of 26hp and a shaft speed of around 1400rpm. How this is achieved depends on the make of engine and reduction box chosen, but I have ended up with Beta 30 (29hp) and a TMC 2.6:1 reduction. To fit the prop there is a cut out in the leading edge of the rudder to give clearance for the blades to turn.

If this is not enough complication a potential buyer still has to consider the different designs of prop on the market because they offer different benefits and if one is investing substantial sums in buying one (it is close to £2k for a 17" Featherstream) one needs to be clear what you expect from the prop. So a simple "has anyone fitted one" will only get a yes or no answer. Anything more requires more contextual information.
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Is the reduction ratio the same in reverse as ahead .
if not can you have different stops?
 
scottie said:
Is the reduction ratio the same in reverse as ahead .
if not can you have different stops?
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Depends on the gearbox. On the TMC 40 the reverse is common at 2.13:1 and forward a choice of 1.5, 2 or 2.6. With a Featherstream you can indeed have different pitches forward and reverse. Many other designs don't. The higher shaft speed in reverse may mean that the pitch can be the same and still get good stopping power and higher thrust - on the list to discuss with Darglow now I have decided on the engine. On the last prop they made for me (when changing pitch was not so easy) we got it wrong and it was vicious in reverse which was good for stopping but overloaded the engine.
 
RivalRedwing said:
I have a R34 with a Darglow Featherstream, well worth the money! Their website implies that they have fitted one to a R32 but they are very helpful on the 'phone, give them a call.
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RivalRedwing said:
I have a R34 with a Darglow Featherstream, well worth the money! Their website implies that they have fitted one to a R32 but they are very helpful on the 'phone, give them a call.
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Hello Redwing. Thanks for good info. I maybe over reacted t'other week ! I've got over sized lines everywhere, can I ask what size your reefing lines are ? Cheers Kevin.
 
about 8mm (Redwing is 80 miles away as I write)..the main criteria is that they need to be thick enough to be easily handled by the crew in inclement weather.
If you've not already done so then join the Rival Owners Association, there is a wealth of info available on the site and a good facebook group too..
 
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