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Old 09-03-2016, 03:34 AM   #2961
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Quote:
Originally Posted by Nomad Willy View Post
Matt wrote;
"Ran out of Jotifair"
How can that be? You always seem to have lots and are truly a master at applying it and probably more importantly sanding it. I never think of it but after seeing all you've done I'll probably use it in the future because I'll think of it.
It probably is'nt very flexable. Are you concerned about that? Can't think of anybody better qualified to fix cracks than you though. I suppose it's like "Bondo" here in the states and it's amazing stuff.

Hi mate.
Yeah ran out. I was made redundant a little while back and the admiral pulled the purse strings up so I just moved on to one of the many thousands of jobs I have to do that I have material for. Luckily I have a large stockpile of other fillers so the employment situation didn't really impact on progress. I've since found a job again so once I finish fairing the stern areas I buy some jotafair and carry on with the flare.

The jotafair is a flexible epoxy marine filler so not really concerned with suitability with flexing

Below link for you mate to see if it'll suit your needs.

http://www.jotun.com/Datasheets/Down...r__Euk__GB.pdf
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Old 09-03-2016, 03:37 AM   #2962
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Originally Posted by Art View Post
Spacious, beautiful interior accommodations will be your result!!


Cheers! - Art

After the admiral has spent the day sunning her sexy legs up on the bow and me throwing big pinkies and Dhui's across the back deck we'll need somewhere comfy to relax ;-)
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Old 09-03-2016, 03:38 AM   #2963
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Originally Posted by CPseudonym View Post
Nice change working on the inside of the boat. Keep up the great work Matt.

Thanks Craigo. You've been quiet. What you been up to mate?!
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Old 09-03-2016, 03:41 AM   #2964
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Today's effort

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Old 09-04-2016, 11:25 PM   #2965
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Hendo's Randall 35 Cray Boat complete rebuild, Perth, Western Australia

Raw water pumps. What has everyone got as their set up for raw water intake. I have a brass jabsco pump operated by a belt connected to the crank on the engine. Is this the norm? I fired up the engine since its been around 2.5 years since the rebuild and ran the whole system with water so I could see how the system operated. The only issue I could see was a leak on one of the coolant hoses and the jabsco pump pulley wobbling around and smoking a little. It's not a new one its one I salvaged from the original set up so maybe I should buy one before scrapping it and coming up with some other way of raw water intakes.

Just checking to see what everyone else has.

I'll post vids later on tonight

Thanks in advance for your help.

Cheers

Matt
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Old 09-05-2016, 06:22 AM   #2966
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Post a picture of the pump setup and indicate where was it smoking.

Ted
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Old 09-05-2016, 06:52 AM   #2967
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Vid from today

https://youtu.be/kHehPXU10og
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Old 09-05-2016, 06:55 AM   #2968
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Originally Posted by O C Diver View Post
Post a picture of the pump setup and indicate where was it smoking.

Ted

Was smoking at the packing gland. Think I had it too tight. Was fine idling but once I upped the revs it got verrrrrry hot.
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Old 09-05-2016, 06:59 AM   #2969
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Think I'll do way with the belt and buy a new pump with a crank mounting plate instead of a pulley and belt.

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Will do way with the mounting plate belt adjusting thing I made too which will work out good too imho
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Old 09-05-2016, 08:59 AM   #2970
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I prefer direct drive pumps. It's important to match GPM (Gallon Per Minute) flow rates at the same RPM. If the pump pulley and the drive pulley on the engine are the same diameter then you only need to match the pump flow rate. If the pulleys are different size, you may need to change pump size to insure adequate water flow.

Ted
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Old 09-05-2016, 09:46 AM   #2971
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Quote:
Originally Posted by O C Diver View Post
I prefer direct drive pumps. It's important to match GPM (Gallon Per Minute) flow rates at the same RPM. If the pump pulley and the drive pulley on the engine are the same diameter then you only need to match the pump flow rate. If the pulleys are different size, you may need to change pump size to insure adequate water flow.

Ted

Hi Ted,
Thanks for you post mate. How should I go about working pump flow rate required? I found this on google.

Does this sound right to you?

"65-70ltrs per minute for each 75kW of engine power"

Thanks for your help mate.
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Old 09-05-2016, 03:15 PM   #2972
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I would start by identifying the pump you currently have. You should be able to find a flow rating tied to an RPM. Let's say your pump produces 40 lts. per minute at 2,000 rpm. Let's say the pulley on the engine is 6" in diameter and the pulley on the pump is 4" in diameter. As engine pulley is 1.5 times bigger in diameter, it will turn the smaller pump pulley 1.5 times faster. So, if the engine is turning 2,000 rpm, the pump will be turning 3,000 rpm and theoretically pumping 60 lts. per minute. So, if this were the case, I would be looking for a 60 lts per minute pump if I were going to direct drive it. This all assumes you had adequate flow with the original pump.

To recap:
You need to know how much flow at what engine RPM you had.
You need to select a pump that will give you the same flow at that same engine RPM.

You can have 4 different engines that will produce 75KW at different RPMs (1,800, 2,400, 3,000, and 3,400). A direct drive pump will likely only produce optimal water flow for 1 of the 4 because of the RPM. The others, theoretically need larger or smaller pumps.

Can you identify the make, model, etc. of your original pump?

Ted
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Old 09-05-2016, 06:32 PM   #2973
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Matt: If I a remember correctly you have a Perkins. A lot of those have all been marinized and have gear pumps. Perkins is still pretty well supported on this side of the pond. What engine do you have? It may have already been spec'd with an off the self pump.
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Old 09-06-2016, 10:11 AM   #2974
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Quote:
Originally Posted by O C Diver View Post
I would start by identifying the pump you currently have. You should be able to find a flow rating tied to an RPM. Let's say your pump produces 40 lts. per minute at 2,000 rpm. Let's say the pulley on the engine is 6" in diameter and the pulley on the pump is 4" in diameter. As engine pulley is 1.5 times bigger in diameter, it will turn the smaller pump pulley 1.5 times faster. So, if the engine is turning 2,000 rpm, the pump will be turning 3,000 rpm and theoretically pumping 60 lts. per minute. So, if this were the case, I would be looking for a 60 lts per minute pump if I were going to direct drive it. This all assumes you had adequate flow with the original pump.



To recap:

You need to know how much flow at what engine RPM you had.

You need to select a pump that will give you the same flow at that same engine RPM.



You can have 4 different engines that will produce 75KW at different RPMs (1,800, 2,400, 3,000, and 3,400). A direct drive pump will likely only produce optimal water flow for 1 of the 4 because of the RPM. The others, theoretically need larger or smaller pumps.



Can you identify the make, model, etc. of your original pump?



Ted

Ill have a look at the pump tomorrow mate.

Just out of interest, can ya go too high in pump volume? I'm looking at a jabsco 6400 series that pumps 200ltrs per minute at 1500rpm.
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Old 09-06-2016, 10:12 AM   #2975
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Quote:
Originally Posted by Larry M View Post
Matt: If I a remember correctly you have a Perkins. A lot of those have all been marinized and have gear pumps. Perkins is still pretty well supported on this side of the pond. What engine do you have? It may have already been spec'd with an off the self pump.

Hi mate. Yeah she's a Perkins 6354 but not an original marinised one
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Old 10-10-2016, 09:20 AM   #2976
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Old 10-10-2016, 11:23 AM   #2977
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Greetings,
Mr. H. Looking good. I like shiny. Seems she'll be ready for paint one of these months...
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Old 10-10-2016, 12:38 PM   #2978
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Too late to go keel cooled? I saw a Gardner that had a keel cooler and a small pump for a wet side exhaust. Couldn't go out the transom. This way you don't need heat exchangers (except for the keel) and you only have a small amount of water for the exhaust, therefore a small pump.
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Old 10-10-2016, 02:32 PM   #2979
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Looking good mate. Looking forward to the christening so we can go fishing
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Old 10-10-2016, 06:45 PM   #2980
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WOW, Thank You Matt for the picture # 6 From today. Side view of the whole boat. I can see the elegance of your design of Solstice. What a beautiful boat you have there. Great flow of shapes and lines along the sides. I haven't quite put it all together in my head until now. Can't wait to see the same perspective in a photograph when you get the final paint on it. Carry on.
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