Boat in build pics (2013 Fairline Squadron 78)

Hi friends, I am John. I am an employee of yachtzmarine.com. Yacht Z Marine offering soda blasting, boat cleaning services and boat bottom painting in Michigan. Paintings and coatings on bottom of boats can be removed by soda blasting service to protect them from seasonal changes.
 
jimmy_the_builder said:
Match has already left Swanwick for more exotic shores further west...
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She's back at Swanwick tomorrow morning. If anyone thinks "So why did she go to Ocean Village then? Why didn't she just stay in Swanwick?" please don't ask me. Ask Fairline :D

One of the props has to come off and be tweaked (up pitch and cupped) due to unequal load on the engines at synched rpm, and Swanwick was the only place with a big enough crane and availability at short notice. I think she'll be on the hard for about 24 hours. Props have to go to Clements in Bedford but someone will drive them there and drive them back. She'll be back in OV maybe thursday
 
Alistairr said:
jfm, many congratulations on becoming a Boat Owner again. :D We hope you have many happy hours onboard, and please continue with pics and videos of your adventures.

Best Wishes,
Alistair, Kirsty and Callum.
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Thanks Al. Good to hear from you. I'll post a few more pics and videos, until she arrives in her home in France, then this thread will have run its course :).
 
scubaman said:
J, I hope you don't mind a slight drift, but I thought I'd post the pics of the old 'Match' I pm'd to you earlier.

I friend of a friend went through quite some trouble to purchase this boat from Sweden. According to my non-boating friend, he bought if off 'The Swedish Match -family' and that the boat was something of a national icon is Sweden.

Lovely boat, and looking from that perspective, Match 2 carries on the same immaculate standard being a perfect match (sorry :) ) for it's 30's (?) counterpart.

The tender is called 'Safety'.
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Not thread drift at all - highly relevant.! What a beautiful machine you have pictured there Scubaman. It must surely be one of Ivar Kruger's boats. He had several in the 1910-1930 era and it looks the right age. IK was particulary protective of the safety match formula which Swedish Match owned exclusively and he made big money licensing the formula to other match producers, so the name of the tender fits the story too
 
167 pages dedicated to what appears to be a simple, basic boat build.......quite extraordinary:confused:


Nearly there.......nearly there........what a gorgeous boat she is:cool:

Glad everything went well for you at Swanwick, Jfm...........any chance of beer and kebabs at the Match111 open evening? That may tempt me.
 
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jfm said:
One of the props has to come off and be tweaked (up pitch and cupped) due to unequal load on the engines at synched rpm, and Swanwick was the only place with a big enough crane and availability at short notice. I think she'll be on the hard for about 24 hours. Props have to go to Clements in Bedford but someone will drive them there and drive them back. She'll be back in OV maybe thursday
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Props are in excellent hands at Clements; Paul knows his stuff. I was mightily impressed with the work they did for me.
 
jfm said:
She's back at Swanwick tomorrow morning. If anyone thinks "So why did she go to Ocean Village then? Why didn't she just stay in Swanwick?" please don't ask me. Ask Fairline :D

One of the props has to come off and be tweaked (up pitch and cupped) due to unequal load on the engines at synched rpm, and Swanwick was the only place with a big enough crane and availability at short notice. I think she'll be on the hard for about 24 hours. Props have to go to Clements in Bedford but someone will drive them there and drive them back. She'll be back in OV maybe thursday
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Please excuse my ignorance if these questions are a little simple.

I presume the problem with the prop was something only just noticed as you state 'short notice'.

If this is so why wasn't it noticed during the sea trials?

If your boat had not been booked for the Swanwick show she could well have been on a ship SofF bound with an unknown issue with the prop?

As I say, please excuse my ignorance and lack of techie knowledge.
 
taz said:
If this is so why wasn't it noticed during the sea trials?
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IIRC, it was. Upon first sea trials, the boat was missing a bit of rpm and both props had to be shortened a bit.
Now, as I understand, rpm @ wot is ok but the load is a bit lower on one engine, which means that its prop was shortened a tad too much, so the process must now be slightly reversed.
In other words, this is a second fine tuning step. Jfm will correct me if I misunderstood anything of course.
But with props, there's one simple rule anyway, and it's that there are only three ways to optimise them: test, test, test. :)

PS for jfm: you are mentioning cupping as if the other prop weren't cupped.
In principle, I wouldn't want cupping on one prop and not on the other, because the higher load generated by cupping is proportionally related to the speed, while pitching is more homogeneus throughout the rpm curve.
Not wanting to teach grandma to suck eggs of course, just a thought...
 
MapisM said:
IIRC, it was. Upon first sea trials, the boat was missing a bit of rpm and both props had to be shortened a bit.
Now, as I understand, rpm @ wot is ok but the load is a bit lower on one engine, which means that its prop was shortened a tad too much, so the process must now be slightly reversed.
In other words, this is a second fine tuning step. Jfm will correct me if I misunderstood anything of course.
But with props, there's one simple rule anyway, and it's that there are only three ways to optimise them: test, test, test. :)

PS for jfm: you are mentioning cupping as if the other prop weren't cupped.
In principle, I wouldn't want cupping on one prop and not on the other, because the higher load generated by cupping is proportionally related to the speed, while pitching is more homogeneus throughout the rpm curve.
Not wanting to teach grandma to suck eggs of course, just a thought...
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Thanks for the reply.........a little more to take in and remember:cool:

One more question........who is grandma?.......;)
 
MapisM said:
IIRC, it was. Upon first sea trials, the boat was missing a bit of rpm and both props had to be shortened a bit.
Now, as I understand, rpm @ wot is ok but the load is a bit lower on one engine, which means that its prop was shortened a tad too much, so the process must now be slightly reversed.
In other words, this is a second fine tuning step. Jfm will correct me if I misunderstood anything of course.
But with props, there's one simple rule anyway, and it's that there are only three ways to optimise them: test, test, test. :)

PS for jfm: you are mentioning cupping as if the other prop weren't cupped.
In principle, I wouldn't want cupping on one prop and not on the other, because the higher load generated by cupping is proportionally related to the speed, while pitching is more homogeneus throughout the rpm curve.
Not wanting to teach grandma to suck eggs of course, just a thought...
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Hi MapisM
Well, the "complaint" aspect here is that this % load difference should have been noticed earlier becuase the data was right there after the seatrial after the props had been shortened. It was somehow not noticed by Fairline and we noticed it on the delivery trip to the boat show last week. The boat is now 200nm from Fairline's crane so now Fairline are having to pay for the boat to be lifted in a 3rd party crane (in Swanwick) rather than using their own crane. For me it's an extra bunch of engine hours faffing around with cranes but no big deal in scheme of things. Boat is on the hard currently, in Swanwick, and props were driven up to Clements today to be fixed. I expect the props will be back in Swanwick tomorrow morning and the boat re-launched

As regards cupping: after a re-pitch the props go thru a kind of MRI scanner which produces a report on pitch of each blade at various radii. On the basis of that, the 2 props were identical after being made shorter. However the MRI scan doesn't record cupping very well, so the difference in load factor is thought to be due to a difference in cupping. The intention with the props at Clements today is to put a bit more cupping on the prop that is drawing the smaller % load factor, then do another sea trial. Thus, to respond to your comment MapisM, the aim of the game is in fact to get the same cupping on both props
 
Aha, I see.
Just curious: after the first props adjustment, how close was the WOT load to 100%, and how different was it between the two sides?
In all sea trial reports which I've seen, the load was anywhere between 97 and 100, and with 1% or 2% difference between the two engines.
I understand that's considered acceptable by engine manufacturers.

Besides, as I recall you confirmed that the max RPM was spot on, but where they being run with the sync turned on?
If yes, THAT was a mistake. But if no, there should have been also an RPM difference - even if probably small.
Which could have given away the load difference, in case the helmsman didn't look at it...

Oh and on a separate note, are all Sq78 props cupped? I wouldn't have expected that.
 
I have the full the data MapisM but not in front of me. I have a few scribbled notes here though.

1. On the first seatrial with too-long props the WOT load was perfectly balanced with throttles synched (98% and 98%), and with throttles unsynched RPM was (accordigly) the same. RPM was below Cat's minimum however. Conclusion is that props were balanced/matched, but too long. I agree with you that 1-2% difference is ok

After the props had been shortened by about 1 inch the max rpm was ok* (synched) but the load at those max rpms were not matched. I do not know if the same test was done unsynched but it would have produced the same conclusion: that one prop was inducing too little load

The "MRI scanner" tells us that it is cupping not pitch, and therefore cupping has been adjusted. The props are going back on as I type this morning. Yes, it is standard to have a bit of cupping on s78 props. I dont know why, but they have data from many seatrials and 92+ builds

* I think, but don't take this as 100% certian, Cat require minimum 2320 rpm at WOT with the boat full of fuel/water/tender etc
 
Props are now reported as balanced (by Essex Boatyards's skipper, who is a nice and knowledgeable guy so I beleive him!), so all ok. Both engines show same lph and load factor at synched rpm, throughout the rpm range, which sounds right. We will get full data on next proper trip out

As Match2 was commuting between her berth and the crane in Swanwick, Jack Haines noticed her going by while he was working and kindly grabbed these pics and sent them to me. Thanks Jack! These are the first pics I have of her underway. Taken on River Hamble near Hamble Point

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