[C38] three blade fixed propeller

Philip Gay eyriepg at msn.com
Mon Oct 10 23:03:49 EDT 2005


I commented before about my experience with my Yanmar 3GM30, but will repeat.  My engine is rated at 27hp max at 3600rpm but 24hp continuous at 3600rpm.  Its displacement is 1 litre.

I was overpropped with my folding Martec and could do 6.8 kts at 2800rpm, but I burned oil like crazy on a 100 hour old engine.  I could do about 7 knts at 3600rpm.  I repropped with a 3 blade Maxprop and now do only 6.2 kts at 2800 rpm but can get close to 7.5 knts at 3600 rpm.  I have more potential speed but cruise slower.  

However, let 2 months of slime build up on the bottom, even with a clean prop, my cruise speed drops to 5.7 knots.

BTW, I bought the Maxprop for better reverse power and hoped less prop walk.  Well it gives much better reverse power AND much more prop walk.  I believe the only way to get away from prop walk is to go to a Saildrive.

Phil Gay
C38 049 Que Linda
Everett, WA
  ----- Original Message ----- 
  From: Rich West<mailto:rw at idea-asylum.com> 
  To: Catalina 38 Listserve<mailto:Listserve at catalina38.org> 
  Sent: Monday, October 10, 2005 7:34 PM
  Subject: Re: [C38] three blade fixed propeller


  I have experienced more prop walk in reverse with a two bladed prop.

  Wow, I wish I made the speed some of you make.  I just repowered with a
  Yanmar 3YM30 and I get about 6 knots at 3000 (it's a  3600 RPM engine).  I
  make about 5.5 at 2600.  I get about the same speed as I did with my old
  Universal M35 (although at lower RPM for the universal).  I think I'm
  burning less fuel, but not by too much.  My boat is WAY overweight.  I guess
  that accounts for some of the speed difference.

  It's sure nice to have this listserve back - THANK YOU!

  Rich, Legacy #360

  P.S. My old Universal is still for sale!  $1500.
  http://www.idea-asylum.com/univ/index.html<http://www.idea-asylum.com/univ/index.html> - yea, it says $1800, but I'm
  more anxious now.




  -----Original Message-----
  From: Listserve-bounces at catalina38.org<mailto:Listserve-bounces at catalina38.org>
  [mailto:Listserve-bounces at catalina38.org]On Behalf Of Jim and Barbara
  Sent: Monday, October 10, 2005 6:00 PM
  To: 'Catalina 38 Listserve'
  Subject: Re: [C38] three blade fixed propeller


  Chapman's has a good discussion of prop walk.  Primary cause is the angled
  shaft; I'm not sure that the prop makes much difference.  Our boat makes 6+
  knots at 2000 rpm with a 2-blade folding prop.

  Jim Williams
  C38 #180
  Checks in the Mail
  Norfolk, VA

  -----Original Message-----
  From: Listserve-bounces at catalina38.org<mailto:Listserve-bounces at catalina38.org>
  [mailto:Listserve-bounces at catalina38.org] On Behalf Of Charles Finn
  Sent: Monday, October 10, 2005 7:31 PM
  To: Catalina 38 Listserve
  Subject: Re: [C38] three blade fixed propeller

  The Mighty Quinn makes 5.5 kts at 2400 rpm with a two blade fixed prop (by
  both of my GPS gadgets).  My old Signet guages regularly told me something
  higher and my Navman units calibrated out of the box agree with my GPS.
  BTW, the bottom paint was new last year and I am in fresh water with almost
  no bottom growth.
  I am thinking of going to a 3 blade prop because I have heard it will reduce
  "prop walk."  Is that true?

  Thanks,
  Charles Finn
  Mighty Quinn  #114
  Lake Champlain
  Burlington, Vt.

  empty wrote:

  >That's in a calm no wind sea (which, of course, is the only time we
  >sailors use the engine ), but I bet you sail faster than me!!!!!! The
  >strength of the stern kick in reverse took a little getting used to. I
  >believe that is not much of a problem with the folding prop.
  >
  >Mark The Goose hull #80
  >----- Original Message -----
  >From: "Duff, Russ (R.W.)" <rduff at visteon.com<mailto:rduff at visteon.com>>
  >To: "'Catalina 38 Listserve'" <Listserve at catalina38.org<mailto:Listserve at catalina38.org>>
  >Sent: Monday, October 10, 2005 7:25 PM
  >Subject: Re: [C38] three blade fixed propeller
  >
  >
  >
  >
  >>Wow!  6.5 knots at 1800 rpm?!  I'm lucky if I get 5.5 knots at 2500rpm
  >>
  >>
  >with
  >
  >
  >>my feathering prop.
  >>
  >>Sincerely,
  >>Russ Duff
  >>Catalina 38, Hull #112
  >>"AVANTURA"
  >>Lake Erie
  >>Grosse Ile, Michigan
  >>RDUFF AT VISTEON DOT COM
  >>
  >>
  >>
  >>
  >>
  >>-----Original Message-----
  >>From: Listserve-bounces at catalina38.org<mailto:Listserve-bounces at catalina38.org>
  >>[mailto:Listserve-bounces at catalina38.org] On Behalf Of empty
  >>Sent: Monday, October 10, 2005 2:14 PM
  >>To: Catalina 38 Listserve
  >>Subject: Re: [C38] three blade fixed propeller
  >>
  >>
  >>Hi Max,
  >>The Goose has a bronze 14 x 12 fixed three blade prop installed in 2004.
  >>Pushes her along fine at 6.5 knots at 1800rpm on her original
  >>Universal
  >>
  >>
  >for
  >
  >
  >>hour after hour. best wishes. Mark
  >>----- Original Message -----
  >>From: "Max Soto" <maxsoto at hotmail.com<mailto:maxsoto at hotmail.com>>
  >>To: <Listserve at catalina38.org<mailto:Listserve at catalina38.org>>
  >>Sent: Monday, October 10, 2005 6:55 PM
  >>Subject: [C38] three blade fixed propeller
  >>
  >>
  >>
  >>
  >>>Hi everybody,
  >>>
  >>>I'm plannig on buying a spare propeller for the Estancia. I have the
  >>>original 5424 with the original fixed two blade 15"x13" (according to
  >>>the 38org. specs.). I remember that there was some mails a few months
  >>>ago about Martec and
  >>>
  >>>
  >>some
  >>
  >>
  >>>other folding propeller, but none about fixed ones.
  >>>
  >>>I read that a fixed three blade was an option from Catalina. Do any
  >>>of you know what's the three blade propeller number for this boat
  >>>with this engine????
  >>>
  >>>I'll really appreciate youy help.
  >>>
  >>>Max Soto
  >>>C38 #198 ESTANCIA
  >>>Puntarenas, Costa Rica
  >>>
  >>>_________________________________________________________________
  >>>Express yourself instantly with MSN Messenger! Download today it's
  >>>FREE! http://messenger.msn.click-url.com/go/onm00200471ave/direct/01/<http://messenger.msn.click-url.com/go/onm00200471ave/direct/01/>
  >>>
  >>>
  >>>_______________________________________________
  >>>Listserve mailing list
  >>>Listserve at catalina38.org
  >>>http://catalina38.org/mailman/listinfo/listserve_catalina38.org
  >>>
  >>>
  >>_______________________________________________
  >>Listserve mailing list
  >>Listserve at catalina38.org
  >>http://catalina38.org/mailman/listinfo/listserve_catalina38.org
  >>
  >>_______________________________________________
  >>Listserve mailing list
  >>Listserve at catalina38.org
  >>http://catalina38.org/mailman/listinfo/listserve_catalina38.org
  >>
  >>
  >
  >
  >_______________________________________________
  >Listserve mailing list
  >Listserve at catalina38.org
  >http://catalina38.org/mailman/listinfo/listserve_catalina38.org
  >
  >


  _______________________________________________
  Listserve mailing list
  Listserve at catalina38.org<mailto:Listserve at catalina38.org>
  http://catalina38.org/mailman/listinfo/listserve_catalina38.org<http://catalina38.org/mailman/listinfo/listserve_catalina38.org>

  --
  No virus found in this incoming message.
  Checked by AVG Anti-Virus.
  Version: 7.0.344 / Virus Database: 267.11.13/126 - Release Date: 10/9/2005


  --
  No virus found in this outgoing message.
  Checked by AVG Anti-Virus.
  Version: 7.0.344 / Virus Database: 267.11.13/126 - Release Date: 10/9/2005



  _______________________________________________
  Listserve mailing list
  Listserve at catalina38.org<mailto:Listserve at catalina38.org>
  http://catalina38.org/mailman/listinfo/listserve_catalina38.org<http://catalina38.org/mailman/listinfo/listserve_catalina38.org>


  _______________________________________________
  Listserve mailing list
  Listserve at catalina38.org<mailto:Listserve at catalina38.org>
  http://catalina38.org/mailman/listinfo/listserve_catalina38.org<http://catalina38.org/mailman/listinfo/listserve_catalina38.org>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://catalina38.org/pipermail/listserve_catalina38.org/attachments/20051010/d0bcd8d4/attachment-0001.html>


More information about the Listserve mailing list