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912 Is performance table is wrong ?

in 912iS Technical Questions 11 years ago

  • Re: 912 Is performance table is wrong ?

    by » 11 years ago

    Sorry, I have not received a response yet, my contact is on a business trip.
    Also I realize now I did not read the title of this post correctly: I assumed it was a 912ULS but now I see it is a 912iS. I will try and get some clarification as I agree it looks like an error.
    Rob
      
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  • Re: 912 Is performance table is wrong ?

    by » 11 years ago

    Sorry, I have not received a response yet, my contact is on a business trip.
    Also I realize now I did not read the title of this post correctly: I assumed it was a 912ULS but now I see it is a 912iS. I will try and get some clarification as I agree it looks like an error.
    Rob


    No problem Rob, I also asked for an explanation to Rotax Italan dealer , but for now no answer ...we confidently await some authoritative answer
    for then post... :)

    Ciao
    Pieri
      
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  • Re: 912 Is performance table is wrong ?

    by » 11 years ago

    Today I received the response of the Italian Rotax dealer:

    Hello Mr. Peter,

    I confirm that the values ​​of MAP reported on the operator manual is incorrect, they represent the consumption l/h and will be changed with the next revision of the manual.

    From the real test you should have approximately the same values ​​as 912ULS.
      
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  • Re: 912 Is performance table is wrong ?

    by » 11 years ago

    Hi,

    I just received the answer of Rotax Cie :

    Dear Sir,

    I thank you for your email below.

    You are indeed right : the manifilf pressure values in the operators manual are not correct, and will be changed in the next issue as follows :
    take-off power : 29 in.HG
    max.continuous power : 27 in.HG
    power setting 75 % : 26 in.HG
    power setting 65 % : 26 in.HG
    power setting 50 % : 24 in.HG

    I thank you for your remark.
      
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  • Re: 912 Is performance table is wrong ?

    by » 11 years ago

    @Sylvain comparison....

    At 75% Power 5000 RPM : 912 ULS = 27,2
    At 75% Power 5000 RPM : 912 iS = 16,5 !!!

    At 65% Power 4800 RPM : 912 ULS = 26,5
    At 65% Power 4800 RPM 912 iS = 13,7...with this set up, my plane fall on the ground !

    At 55% Power 4300 RPM 912 ULS= 26,3
    At 50% Power 4300 RPM 912 iS = 11,1

    It seems to me that the in.Hg column seems like the fuel consumption values



    Sylvain
    The values ​​used for comparison not refer to the 912 uls but to 912 ul ( 80 hp ) B)

    Pietro
      
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