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Little thrust, prop too small?

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chris View Drop Down
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Joined: 30 Oct 2010
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Post Options Post Options   Quote chris Quote  Post ReplyReply Direct Link To This Post Topic: Little thrust, prop too small?
    Posted: 30 Oct 2010 at 5:24pm
Hello,

On the newly purchased Coontessa, two days out of the port of purchase the clutch went and, leaving us only with reverse. We were 5 miles from the nearest port with no wind. We tried to reverse but C32's do not like going backwards.

Anyway wind picked up and we got into port after 5 hours at ~1 knot.

With the boat on the hard we found we can move the prop approx 2 mm and are therefore going to replaces the bushes and service the rudder at the same time. JR's yard was very helpful in talking us through the procedure and I have taken photo's throughout. I am continuesly amazed at the quality of the laminate, although there is a small area of osmosis (was treated in 96 ... grrrrrr).

Back to the purpose of the post. When manoeuvring the boat the prop never seemed to provide enough thrust, i.e. when trying to slow her down as we approached the pontoon. There isn't any room for a larger prop and I notice some people line the props up with the keel (you must be very flexible to reach that area) .... has anyone gone for a three bladed prop?   

Kind Regards,


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davidmacdonald View Drop Down
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Post Options Post Options   Quote davidmacdonald Quote  Post ReplyReply Direct Link To This Post Posted: 30 Oct 2010 at 6:16pm
Hi Chris, sorry to hear of your problems with the new boat.

We have the two bladed prop and definitely notice a lack of reverse thrust which can make slowing into a slip tricky when there's a cross wind.  Many Contessas have three bladed props, but as they cause a lot of drag  a three bladed folding prop is also popular - I think the general consensus is with Darglow and a lot of folding props and most if not all feathering props won't fit in the aperture anyway.
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nardus View Drop Down
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Post Options Post Options   Quote nardus Quote  Post ReplyReply Direct Link To This Post Posted: 15 Nov 2010 at 10:04am

Hi Chris, i have an Contessa32 with a 2 blade prop. When in reverse first she goes sideways couse the lack of speed. After a while she will goes straight. ( 2 knots or so) I`ll always manouvre backwards into my small box. Full trottle from standstill will result in going sideways much faster than gently accelerate when building up hullspeed.

Ben H
Contessa 32 "Quintessens"
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GlennG View Drop Down
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Post Options Post Options   Quote GlennG Quote  Post ReplyReply Direct Link To This Post Posted: 19 Nov 2011 at 2:13am
Have a three bladed prop on my Contessa.  Works exceedingly well,  particularly in reverse where she stops quite quickly.  She also has a pronounced kick to port in astern which is great for manoeuvring.

I've never noticed any particular drag as we use the engine if there's no wind - cruiser not racer.   When there's plenty of wind,  so what!   I also think the £250 inc delivery for a custom built prop is well worth the money.  I can't help but feel that the £1200+++ extra for the Darglow folder just isn't worth it.
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