[NSRCA-discussion] OS 91FX or 120 AX for Focus sport

[JShulman]

Stock muffler

Regards,
Jason
www.jasonshulman.com
www.shulmanaviation.com
www.composite-arf.com

  -----Original Message-----
  From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of Bob Richards
  Sent: Thursday, June 26, 2008 3:56 PM
  To: General pattern discussion
  Subject: Re: [NSRCA-discussion] OS 91FX or 120 AX for Focus sport


        What are you guys using for muffler/pipe on the 120AX?



        What you say makes sense if you look at ALL the numbers. The 2.8hp
of the .91 is at 15k rpm, while the 1.20 is 3.1hp @ 9k rpm.  The hp of the
.91 will probably be much less at a pattern useable rpm, while the rated rpm
of the 1.20 is very close to a useable rpm figure.



        Bob R

        --- On Thu, 6/26/08, J N Hiller <jnhiller at earthlink.net> wrote:


          From: J N Hiller <jnhiller at earthlink.net>
          Subject: Re: [NSRCA-discussion] OS 91FX or 120 AX for Focus sport
          To: "General pattern discussion"
<nsrca-discussion at lists.nsrca.org>
          Date: Thursday, June 26, 2008, 4:02 PM


          I recommend the 1.20 AX. It will turn a bigger prop, which offers
a more efficient HP – Thrust conversion. I am flying advanced with a 9+lb
airplane powered with the 1.20 AX and a 16-10 APC. I am getting away with
the 16-10 but I feel I am pushing the upper limit. It would probably be more
comfortable with a 15-10 or 16-8. It is probably more power than needed in
lower classes but throttle management is one of the things we need to learn
and the sooner the better, besides the extra power will be most welcome in
adverse weather conditions.

          Jim Hiller








               120AX
               91FX

                Displacement (Cu in)
               1.2
               0.91

                Weight (gr)
               650
               550

                Output (BHP at RPM)
               3.1 at 9000
               2.8 at 15,000

                Cost
               250
               200





                output/ weight
               0.004769
               0.005090909

                Output/ displacement
               2.583333
               3.076923077




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