[SPAM] Re: Three blade size

[David Lockhart]

WRT the APC 3 15.75-13 3 blade -

In practice, it works well re-pitched to 10 or 11 for the 140 engines.  For the 160/170s, it works well at 10, 11, or 12.  Very strong 160/170s (ie, tip the nitro) can effectively handle the stock prop.

Setup of the engine/pipe is a huge factor - as is the priority a given pilot might have on peak power vs midrange throttle response.  Longer pipes and less prop loads contribute to better throttle response (but less power).  Given 30% nitro, relatively short pipe, and a clean light plane, the 15.75-13 will provide reasonable performance on a 140 - it will be super quiet, but not have the best throttle response - and it will be very sensitive to having the needles setu just right.

I've not run the Mejlik / Cleveland props.  I do know the 16-11 Bolly 3 blade is less load than the 15.75-11 APC 3 blade.  The APC is quieter, faster, and pulls better.  The Bolly is louder for 2 reasons - higher RPM, and the CF material transmits noise more than the FG/nylon - and the noise is a different quality of noise - the CF tends to be more tinny/raspy - not as mellow and smooth - this idea applies to all CF props I've used (compared to the APC stuff).

Regards,

Dave

----- Original Message ----- 
  From: Bob Pastorello 
  To: discussion at nsrca.org 
  Sent: Saturday, June 11, 2005 7:43 AM
  Subject: Re: [SPAM] Re: Three blade size


  The 13 pitch three blade is too much for the OS 1.60.  It works, but it's straining a bit on 15%.  Might be fine with 20 or 25% nitro; never tried different fuel.  The 16 x 11 GRS three blade sounds pretty interesting, Wayne.  May have to borrow yours to find out.......... :-)

  Bob Pastorello
  www.rcaerobats.net
  rcaerobob at cox.net
    ----- Original Message ----- 
    From: wgalligan 
    To: discussion at nsrca.org 
    Sent: Saturday, June 11, 2005 1:12 AM
    Subject: [SPAM] Re: Three blade size


    I dont think it would be enough load for that much engine.
    I would think a 15.75x13 APC 3 blade would load the OS 1.60 better. 

    WG

      ----- Original Message ----- 
      From: Mike Hester 
      To: discussion at nsrca.org 
      Sent: Friday, June 10, 2005 7:00 PM
      Subject: Re: Three blade size


      The Mejlik 16x11 was AWESOME on the 160fx, best prop by far. Just a bit loud. I think I'll try one of these Cleveland 16x11s and see what the difference is.

      -Mike
        ----- Original Message ----- 
        From: Mark Hunt 
        To: discussion at nsrca.org 
        Sent: Friday, June 10, 2005 7:37 PM
        Subject: Re: Three blade size


        That is notable....3 blades instead of two and yet one ounce lighter than the apc!

        Sounds like a good prop for the 160fx??

        Mark
          ----- Original Message ----- 
          From: Wayne Galligan 
          To: discussion at nsrca.org 
          Sent: Friday, June 10, 2005 3:53 PM
          Subject: Re: Three blade size


          Something different.   Look like clones.    But I think for less $$
          This 16x11 3 blade has good performance and is noticeably slower then the 17x12 2-blade APC.   
          The 3 blade 16x11 is one ounce lighter then the 17x12 APC also.

          Wayne G


            ----- Original Message ----- 
            From: Mike Hester 
            To: discussion at nsrca.org 
            Sent: Friday, June 10, 2005 3:45 PM
            Subject: Re: Three blade size


            Those look a LOT like Mejlik props, wierdly enough even the sizing is the same. What's up with that?

            Anyway I have a Mejlik 16x11 I tested yesterday. It has an extremely wide blade root and a 120 cut  TT was too small to fit. Also the hole Dia is 3/8 so a bushing would need to be used on a 140. I can say this...it's louder than the APC, but it's PERFECT in performance.

            So are these Mejlik clones or are they something different?

            -Mike
              ----- Original Message ----- 
              From: Wayne Galligan 
              To: discussion at nsrca.org 
              Sent: Friday, June 10, 2005 4:06 PM
              Subject: Re: Three blade size


              Cleveland props does make a c.fiber 16x11  and I am using one on my OS 1.40 and I like it.

              see this link:

              http://pages.prodigy.net/gcleveland_grsmodels/_import/pages.prodigy.net/gcleveland_grsmodels/index6.html

              Wayne Galligan
                ----- Original Message ----- 
                From: randy10926 at comcast.net 
                To: discussion at nsrca.org 
                Sent: Friday, June 10, 2005 3:01 PM
                Subject: Re: Three blade size


                I wish they made a 3 blade 16X11

                  -------------- Original message -------------- 

                  Does anyone make a three blade 16 x 10 ?

                  Bob Pastorello
                  www.rcaerobats.net
                  rcaerobob at cox.net
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.f3a.us/pipermail/nsrca-discussion/attachments/20050613/05a427ca/attachment.html