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

[Ken Velez]

1.20 AX is a better choise I think just because it easyer to operate and besides it has more power.

Ken
  ----- Original Message ----- 
  From: Shoval Aviv-BAS036 
  To: nsrca-discussion at lists.nsrca.org 
  Sent: Thursday, June 26, 2008 1:24 PM
  Subject: [NSRCA-discussion] OS 91FX or 120 AX for Focus sport


  Hi All,

  I'm fairly new to pattern flying. I'm considering to buy the Focus sport and want to "keep it simple" with the engine. I know the Focus was design for YS 110 but for cost/ simplicity reasons i am considering the OS 91 FX or the OS 120 AX. In the OS web site they claim that the 120AX is 20% more power but when I compare efficiency it looks like the 91FX wins. Its 6% more efficient in power to Wight and 16% more in power to displacement. Am I missing something? Practical RPM misleading numbers? What would be your recommendation?

   

         
       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
       

   

   

  Best Regards,

  Aviv

   



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