Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 16-11-2012, 16:53   #1
Registered User
 
engele's Avatar

Join Date: Oct 2009
Location: On the boat -> PNW -> Mexico -> Central America
Boat: Seafarer 38
Posts: 360
Prop shop in Panama City Panama?

I need a recommendation on a prop shop in Panama City. We recently replaced our transmission with a Hurth 250 that has a different gear ratio than our old Paragon. We have a Perkins 4.108 at 45hp and the Hurth has a ratio of 2.75. Our old prop on our 8 ton boat was a 19x11 and seemed over pitched. With the new teams though we can't even hit 5 knots. I need to either repitch more aggressively or buy a new prop. Any recommendations?
__________________

engele is offline   Reply With Quote
Old 16-11-2012, 17:17   #2
Senior Cruiser
 
atoll's Avatar

Cruisers Forum Supporter

Join Date: Mar 2010
Location: gettin naughty on the beach in cornwall
Boat: 63 custom alloy sloop,macwester26,prout snowgoose 37 elite catamaran!
Posts: 9,311
Images: 75
Re: Prop shop in Panama City Panama?

first work out the correct size prop you need for the new configuration.
then see if your old prop can be changed or if you need a new prop.

online calculator here:

Vicprop - Propeller Calculator
__________________

__________________
my catamaran building project updates http://www.cruisersforum.com/forums/...36#post2502136
atoll is offline   Reply With Quote
Old 16-11-2012, 18:14   #3
Registered User
 
jeremiason's Avatar

Join Date: Oct 2010
Location: Punta Gorda, Florida
Boat: Sea Ray 270
Posts: 1,427
Images: 2
Send a message via ICQ to jeremiason Send a message via Yahoo to jeremiason Send a message via Skype™ to jeremiason
Re: Prop shop in Panama City Panama?

This is in the 2012 Panama City Cruisers Guide:

Cristobal Marine Repair
232-6575 www.cmrepair.com
In
Diablo (Ancon), Local No 2, Edificio 42-E, Calle Arnulfo Arias Madrid (turn left at the El Rey in Diablo, cross the train tracks and take the first right after the tracks)

Shipbuilding and ship repair. Have a propeller shop
__________________
Tom Jeremiason
Punta Gorda, Florida

jeremiason is offline   Reply With Quote
Old 16-11-2012, 20:00   #4
Registered User
 
engele's Avatar

Join Date: Oct 2009
Location: On the boat -> PNW -> Mexico -> Central America
Boat: Seafarer 38
Posts: 360
Quote:
Originally Posted by atoll
first work out the correct size prop you need for the new configuration.
then see if your old prop can be changed or if you need a new prop.

online calculator here:

Vicprop - Propeller Calculator
Thank you Atol. This is by far the best prop calculator I have seen and it gives an answer more in line with what I would expect.
engele is offline   Reply With Quote
Old 16-11-2012, 20:05   #5
Registered User
 
engele's Avatar

Join Date: Oct 2009
Location: On the boat -> PNW -> Mexico -> Central America
Boat: Seafarer 38
Posts: 360
Quote:
Originally Posted by jeremiason
This is in the 2012 Panama City Cruisers Guide:

Cristobal Marine Repair 232-6575 www.cmrepair.com
In
Diablo (Ancon), Local No 2, Edificio 42-E, Calle Arnulfo Arias Madrid (turn left at the El Rey in Diablo, cross the train tracks and take the first right after the tracks)
Shipbuilding and ship repair. Have a propeller shop
Thanks. I realized quickly today that we were under propped. I had a smaller diameter prop that was RH rather than LH, but pitch equal. The ratios on the trans changed, but we were pretty over propped before so I had hopes we would come out close. We didn't. In the morning I am going to dive the prop and swap back to the old one that turns in the wrong direction, but is closer to correct because of the larger diameter. If the boat cruises ok, but up a hundred RPMs okay, that's fine I'll deal with it until I can get back to the US, if it doesn't I may need to re pitch it and add an oil cooler to the transmission.

Where did you find the Panama City Cruising guide? Southbound group?
engele is offline   Reply With Quote
Old 16-11-2012, 20:08   #6
Registered User
 
engele's Avatar

Join Date: Oct 2009
Location: On the boat -> PNW -> Mexico -> Central America
Boat: Seafarer 38
Posts: 360
Quote:
Originally Posted by jeremiason
This is in the 2012 Panama City Cruisers Guide:

Cristobal Marine Repair 232-6575 www.cmrepair.com
In
Diablo (Ancon), Local No 2, Edificio 42-E, Calle Arnulfo Arias Madrid (turn left at the El Rey in Diablo, cross the train tracks and take the first right after the tracks)
Shipbuilding and ship repair. Have a propeller shop
Never mind I just saw your link. The Sarana guides are the best for Pacific Central America. Thank you.

Élan
engele is offline   Reply With Quote
Old 16-11-2012, 23:28   #7
Registered User
 
Pato's Avatar

Join Date: Mar 2011
Location: Sidney b.c
Boat: Ct 37
Posts: 162
In the morning I am going to dive the prop and swap back to the old one that turns in the wrong direction, but is closer to correct because of the larger diameter. If the boat cruises ok, but up a hundred RPMs okay, that's fine I'll deal with it until I can get back to the US, if it doesn't I may need to re pitch it and add an oil cooler to the transmission.

If its left hand transmission and you put a RH prop on it you would have to run the gear in revers to go forward and some transmissions have different ration between forward and revers as well as it is very stress full for the gears in the transmission as the loads will be reversed from how they are suppose to be loaded I would highly recommend not doing this
__________________
Pato is offline   Reply With Quote
Old 17-11-2012, 08:11   #8
Registered User
 
engele's Avatar

Join Date: Oct 2009
Location: On the boat -> PNW -> Mexico -> Central America
Boat: Seafarer 38
Posts: 360
Quote:
Originally Posted by Pato
In the morning I am going to dive the prop and swap back to the old one that turns in the wrong direction, but is closer to correct because of the larger diameter. If the boat cruises ok, but up a hundred RPMs okay, that's fine I'll deal with it until I can get back to the US, if it doesn't I may need to re pitch it and add an oil cooler to the transmission.

If its left hand transmission and you put a RH prop on it you would have to run the gear in revers to go forward and some transmissions have different ration between forward and revers as well as it is very stress full for the gears in the transmission as the loads will be reversed from how they are suppose to be loaded I would highly recommend not doing this
Pato,

Hurth calls for a cooler if the trans is run in reverse (b position), but say it should be fine otherwise. Would you avoid doing it anyway?

Élan
engele is offline   Reply With Quote
Old 17-11-2012, 16:19   #9
Registered User
 
Pato's Avatar

Join Date: Mar 2011
Location: Sidney b.c
Boat: Ct 37
Posts: 162
I would use a trans cooler either way. I would still avoid running a rh prop on a lh gear It would suck to damage your new gear especially if you plan on swapping to correct prop in the future. Did you ask them if its has same ration in both A and B positions ?
__________________
Pato is offline   Reply With Quote
Old 18-11-2012, 05:26   #10
Registered User
 
engele's Avatar

Join Date: Oct 2009
Location: On the boat -> PNW -> Mexico -> Central America
Boat: Seafarer 38
Posts: 360
Ratio in A position is 2.74 and ratio in B position is 2.72. Twin engine boats often use this trans because the ratios are so close (but use a cooler when running in the B position). I am still hesitant to run forward in the B position. The trans is an Hurth HBW 250. In the A position it was 144 degrees F on my digital thermometer. I've swapped in my LH pitch 11x19, and today we will go out briefly and test the gear temp and boat performance. We have a Perkins 4.108 paired with a Seafarer 38.
engele is offline   Reply With Quote
Old 18-11-2012, 13:52   #11
Registered User
 
engele's Avatar

Join Date: Oct 2009
Location: On the boat -> PNW -> Mexico -> Central America
Boat: Seafarer 38
Posts: 360
The temp was a few degrees hotter today at 154 degrees, but I also pushed the boat harder. We were able to go 4.5 into wind and chop and 5.5 away from it (or a bit better).

I still think we need a RH prop with more pitch than what we have.
engele is offline   Reply With Quote
Old 20-11-2012, 17:05   #12
Registered User
 
engele's Avatar

Join Date: Oct 2009
Location: On the boat -> PNW -> Mexico -> Central America
Boat: Seafarer 38
Posts: 360
We now have a trans cooler that I fabricated out of stainless steel now and we are still trying to locate a prop that doesn't need to ship from Miami. Cristobal Repair wanted $100 to tell us if they could change our props pitch and then tell us what it would cost. It sounded more expensive to do a repitch here than buying a new prop, but the soonest they would be able to get a new one was "at least two and a half weeks". I guess we will keep looking at options. Losing a knot motoring would be unfortunate, but once in te land of stuff we can take care of it.
engele is offline   Reply With Quote
Old 27-11-2012, 12:48   #13
Registered User
 
Bambolera's Avatar

Join Date: Nov 2012
Posts: 79
Re: Prop shop in Panama City Panama?

I'm in Panama city too and I have a spare prop. I changed over to a max prop a few years back and kept the old prop as a spare. I believe it's also a Left hand drive, however, so you may not be interested. I'll check the size the next time i'm at the boat.
__________________
Bambolera is offline   Reply With Quote
Old 12-12-2012, 17:40   #14
Registered User
 
engele's Avatar

Join Date: Oct 2009
Location: On the boat -> PNW -> Mexico -> Central America
Boat: Seafarer 38
Posts: 360
Thanks. We pushed off and made Jamaica, underpitched and all. Our window was good and I have a new prop coming from the USA on Saturday.
__________________

engele is offline   Reply With Quote
Reply

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 04:19.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.