Reply
 
Thread Tools Display Modes
 
Old 05-29-2015, 10:11 PM   #1
Senior Member
 
Conall63's Avatar
 
City: Cape Coral, Florida
Country: USA
Vessel Name: Gra Go Deo
Vessel Model: Roberts TY 43
Join Date: Apr 2014
Posts: 191
Prop sing

One of the bugs on my new built boat last season was my prop singing at certain rpm. The 30 x 18 four blade would make a loud, running ones finger around a wine glass sound , between 1200 and 1600 rpm. It was loud and big time annoying. So annoying that I ran her mostly @ 1700..

While on the hard this winter, I had the prop shop check the wheel and grind the leading edge to try to stop the singing . We launched today, and I'm big time happy to rport the anti sing edge worked ,and she's running quiet.

The prop is a Chinese unit and was about 800 less expensive than one from Michigan wheel.

Anyway, I'm happy we're back in the water, and that a low cost remedy fixed a gremlin.

Conall
__________________
Advertisement

Conall63 is offline   Reply With Quote
Old 05-29-2015, 10:54 PM   #2
Master and Commander
 
markpierce's Avatar
 
City: Vallejo CA
Country: USA
Vessel Name: Carquinez Coot
Vessel Model: 2011 Seahorse Marine Coot hull #6
Join Date: Sep 2010
Posts: 10,265
Had the same issue and remedy (after two attempts).
__________________

__________________
Kar-KEEN-ez Koot
markpierce is offline   Reply With Quote
Old 05-29-2015, 11:42 PM   #3
Guru
 
twistedtree's Avatar
 
City: Gloucester, MA
Country: USA
Join Date: Jan 2013
Posts: 3,197
Wow, this is really interesting to hear you guys had this problem. A friend of mine with a new Nordhavn has the same problem. I had never heard of such a thing. Fortunately mine is quiet.
__________________
www.MVTanglewood.com
twistedtree is offline   Reply With Quote
Old 05-30-2015, 12:14 AM   #4
Senior Member
 
City: MD
Country: USA
Vessel Name: Blue Yonder
Vessel Model: 37
Join Date: Mar 2013
Posts: 346
Same problem and same fix on a previous boat
BlueYonder is offline   Reply With Quote
Old 05-30-2015, 10:10 AM   #5
Guru
 
Ski in NC's Avatar
 
City: Wilmington, NC
Country: USA
Vessel Name: Louisa
Vessel Model: Custom Built 38
Join Date: Jan 2014
Posts: 3,888
Once you get some barnacles or mineral coating on the wheel, it will stop singing. That's how I know it's time to clean.

Mine only does it when at non-cruising rpm. I kinda like it. But it is not loud.
Ski in NC is offline   Reply With Quote
Old 05-30-2015, 11:23 AM   #6
Guru
 
Gulf Comanche's Avatar
 
City: Baton Rouge, Louisiana
Country: U.S.A.
Vessel Name: Old School
Vessel Model: 38' Trawler custom built by Hike Metal Products
Join Date: Dec 2007
Posts: 799
Mine sings at low rpm, around 1100. At 1600 no sing, then back down low and sings till boat slows way down.
Gulf Comanche is offline   Reply With Quote
Old 05-30-2015, 12:43 PM   #7
Guru
 
Nomad Willy's Avatar
 
City: Concrete Washington State
Country: USA
Vessel Name: Willy
Vessel Model: Willard Nomad 30'
Join Date: Oct 2007
Posts: 13,714
I had that problem on my Albin .... 12 years ago.
__________________
Eric

North Western Washington State USA
Nomad Willy is offline   Reply With Quote
Old 06-07-2015, 05:54 PM   #8
TF Site Team
 
FlyWright's Avatar
 
City: California Delta and SF Bay
Country: Sacramento, CA, USA (boat in Vallejo)
Vessel Name: FlyWright
Vessel Model: Marshall Californian 34 LRC
Join Date: Apr 2008
Posts: 10,184
I believe that 'singing' is telling you that the prop speed is causing a resonant frequency to set up which sends vibrations through the prop. I remember some airplanes which had this problem and the remedy was to avoid continuous operation at that RPM range causing the resonance. Failure to avoid these speeds could cause fatigue damage to the propeller.

Not sure if it's the same with boats, but I'd be cautious to avoid continuous operation at that engine speed range.
__________________
Al

Custom Google Trawler Forum Search
FlyWright is offline   Reply With Quote
Old 06-07-2015, 08:05 PM   #9
Guru
 
Brooksie's Avatar
 
City: Cape Cod, MA
Country: USA
Vessel Name: Island Seeker
Vessel Model: Willard 36 Sedan
Join Date: Oct 2007
Posts: 954
I had a singer too and it was a new Michigan... a soprano I think. It also had 3 craters in it which had been welded up with incompatable brazing rod at the factory. They had their local distributor fix it but nothing for hauling, removing or shipping. They tried to make me think they were doing me a big favor at that. Needless to say my last Michigan wheel.
Brooksie is offline   Reply With Quote
Old 06-08-2015, 06:26 AM   #10
Guru
 
Capt.Bill11's Avatar
 
City: Sarasota/Ft. Lauderdale
Country: USA
Join Date: Apr 2014
Posts: 5,422
http://hydrocompinc.com/wp-content/u...Propellers.pdf
__________________

Capt.Bill11 is offline   Reply With Quote
Reply

Thread Tools
Display Modes

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





All times are GMT -5. The time now is 06:19 AM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2006 - 2012