Effects of damaged props

[Gludy]

Boat came out of the water for the first time this week.

One of the props has a small dent (curved edge slightly folded back on itslef a few inches long). I am having it repaired but would like to know just what effect a small dent like this can have?

Also I noticed that the two rudders are not set perfectly in line iw. when one is straight, the other is still at an angle! I am having these reset but it must have meant that straight ahead could only occur when in effect both props were at a slight abgle to the direction of motion of the boat - this may have shaved a fair few knots off - has anyone ever experienced this?

On balance, I have decided to leave the rope cutters on.

Apart from that the the boat is fine, no signs of any blistering and very little fouling.

Paul


Paul

 

[Deleted User YDKXO]

Paul, its difficult to tell what effect the damage will have had but if you didnt feel any undue vibration through the boat then its unlikely you will have lost much speed. Again, I dont think a slight misalignment of the rudders will make much difference either but its worthwile setting everything up properly. Keep us posted when the boat goes back in.

 

[hlb]

Slower speed. Vibration, Rattles, bangs and thumps.
Depends how bad it is.

Have you sent off Your Stamped. SAE and cheque. Yet.

Haydn

 

[byron]

It is amazing how much the slightest chip or bend in a prop can affect performance. Sometimes the effect is negligable another time it can shave a couple of knots. The rudder alignment whilst not satisfactory is not crucial though could put undue strain on the rudder post or even the hull entry.

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My wife has not given me permission to express any opinion here

 

[Gludy]

The prop is now repaired - the rudders were not slightly out but about 20 degrees out! In effect to go straight, they both stuck outwards at an angle of 10 degrees. This must have effected speed. In any event its a great excuse for my early boat handling.
It seems that someone had fitted the autohelm stuff with a fixed bar at the back that guessed at the prop alignment when the boat was in the water. I am now having an adjustable bar fitted.

Nope -have not sent the burgee stuff off as yet but will knuckle down to it tonight.

I am lookning forward to the boat going back into the water and gettting out on her. I should gain speed with a clean hull, polished prop shafts which had a good growth of sea life on them and straight rudders. Add the burgee to this and an extra 4 knots should be attanable, 1 knot coming from all the changes and 3 knots from the wing effect of the burgee lifting up the stern and counteracting all that weight! I am leaving the rope cutters on.

Paul

 

[tcm]

Re: growing season

the growing season for the gunge underneath starts april may - same as growing stuff int he garden. If cleansd last autumn (about when u bort it) then won't be a probem...yet. Have a look at other boats in same marina- you'll get whatever barncles/carpet like what they have got