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Thread: Does this sound right?

  1. #1
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    Default Does this sound right?

    Hello All,

    Just thought I would see if im on the wrong track or not.

    Duct size 850mm

    max revs of engine 7000.approx 50hp max

    Avaliable sizes of htd 8mm pulleys decided on 26/56

    This gives a ratio of 2.15 = fan speed of 3250 rpm

    Tip speed of 144.6 m/s

    Driving a 9 5z hub with nine blades.



    Just thought I would check as them pulleys arnt cheap if you get it wrong.





    Regards

    Craig




  2. #2
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    Default Re: Does this sound right?

    If your planing to race would use a 28 pulley on the bottom so to keep as many teeth in contact with the belt 58 top 150m/s or 30 bot 62 top 151m/s or if you want to run the fan at 167m/s use 28 bot 52 top but only use 6 blades in 9.If it's for a cruiser thats completly different.



    Geoff

  3. #3
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    Default Re: Does this sound right?

    Hello Geoff,

    Not too sure at the moment.Kids cant race with the engine .Robin ec44.

    The hull Fenland flyer so not suited for cruising.

    Engine was a drunken ebay buy 80.lol

    Ive been trying to get of the ground for about 5 yrs now so thought go ahead with the robin then if an engine suited for f3/juniors comes along at the right price would put that in the fenland and the robin into a simple cyclone hull ive got as well.



    Craig








  4. #4
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    Default Re: Does this sound right?

    Hi cadfly

    A rotax should rev to 6500 so just in case you get an engine without a gearbox may be go conservative on ratio to use either engine as pullies cost about 1.50 a tooth maybe more as it's along time since i had one made.

    I may have a 447 for sale soon with a gearbox ratio 2.24/1



    geoff


  5. #5
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    Default Re: Does this sound right?

    Hello Geoff,



    MMMM another engine.

    When you know give us a shout could sell one of the kids.

    Damn would still have three left.lol





    Craig


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