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Thread: fan advice please.

  1. #1
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    Default fan advice please.

    28hp in 925 duct, engine 7000rpm reduction 1:2.42



    intergrated craft, which is very light!



    five bladed 5z?



    thanks


  2. #2
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    Default Re: fan advice please.

    no one able to help me on this?

  3. #3
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    Default Re: fan advice please.

    Too fast Jon - tip speed works out at 140m/sec. It will be very noisy - recommended is 122m/s.



    Ian Brooks has a calculator (see HERE) that will work it all out properly.

  4. #4
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    Default Re: fan advice please.

    Been a bit busy lately... whats it for? PM if its a big secret!



    Ian

  5. #5
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    Default Re: fan advice please.

    i've just tested a 28hp engine in a light integrated craft weighing just under 100kg with a 920 duct with 6 5Z blades in a 9 bladed hub - fan is spinning 3-3500 rpm which is getting towards maximum tip speed of 168m/s



    it hovered OK with an adult in and skirt pressure seemed OK but is intended for a junior/cadet craft



    lift will suffer a little more with a 5 in i reckon



    i currently run 5 bladed fans in the same hull and duct with 50+Hp engines for our F3 craft and it's fine with those



    movie of the 28Hp craft's first flight is on my website (under construction)



    hope that helps



    Tony








  6. #6
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    Default Re: fan advice please.

    hi tony



    thanks for the advice, think the flying fish now use the 5 of 5 5z over the 6 in 9, from what i have heard, the lift is similar and they are slightly faster? anyone with a 5/5/5z shed any light?



    Thanks all



    jon

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