Electric Aircraft for Engineering Senior Design Project

Discussion in 'Electric Propulsion' started by tgcastleman, Sep 25, 2019.

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  1. Sep 27, 2019 #41

    proppastie

    proppastie

    proppastie

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    The HP-24F .......What does the F stand for?
     
  2. Sep 27, 2019 #42

    BoKu

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    FES--the LZ Design Front Electric Sustainer system.
     
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  3. Sep 27, 2019 #43

    proppastie

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    How much for the engine system?
     
  4. Sep 27, 2019 #44

    BoKu

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    You'd do best to check with them directly; we don't get any kind of discount pricing. Last I checked the entire system was about $23k.
     
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  5. Sep 27, 2019 #45

    proppastie

    proppastie

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    Does that include the airframe? (entire) joke
     
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  6. Sep 27, 2019 #46

    Hot Wings

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    If that were true than an artificially induce multi-day blackout would be quite beneficial.:cool:*

    * we don't have a "grumpy sarcastic old dude" emoticon.
     
  7. Sep 27, 2019 #47

    RonL

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    I believe most people should be aware of what an APU (auxiliary power unit) is, a simple generator/motor with an attached propeller when extended out of a fuselage into the slipstream makes a useable amount of electrical power, I would think they are crazy inefficient but I don't know the facts about what power at what cost.
    What I do believe, is that a good clean design of a tube-like duct can increase the energy density of airflow and move it into a more desirable pattern of flow inside the tube, it doesn't have to move straight through.
    I again would use the example of a vortex tube cooler and how the energy density moves to the outermost bands of air swirl inside the tube.

    As to Pops question, I would give an example of a cyclone separator as used in powerplants to dry superheated steam before applying it to the turbine blades.
    A pound or two of diffusing fins could spin some slipstream air and cause the moisture separation to take place and be a lot less weight than a closed system condenser design.
    But these are just seed thoughts, well beyond my ability to design in detail.
     
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  8. Sep 27, 2019 #48

    Pops

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    That is what is needed, fresh new ideas to make it work.
     
  9. Sep 27, 2019 #49

    Aerowerx

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    ....and usually when there is total engine failure.

    But aren't there 2 APUs? The one that provides power on the ground when the main engines are off, and the one that is used in emergency situations. Are they both called APU?
     
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  10. Sep 27, 2019 #50

    Dan Thomas

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    Nope. An APU is a small turbine engine inside the airplane that runs a generator, and its compressor is way oversized to provide bleed air for starting, heating and airconditioning while on the ground.

    The thing that drops out into the slipstream is a ram air turbine that spins a generator or hydraulic pump. https://en.wikipedia.org/wiki/Ram_air_turbine
     
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  11. Sep 27, 2019 #51

    RonL

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    Thanks, :oops:
     
  12. Sep 27, 2019 #52

    RonL

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    Yeah, pictsidhe gave me his best knowledge :)
     
  13. Sep 28, 2019 #53

    pictsidhe

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    It is a serious flaw in HBA. I say we riot until the mods give us one!
     
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  14. Sep 28, 2019 #54

    BJC

    BJC

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    Sure we do. Here it is: “BJC”.


    BJC
     
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  15. Oct 17, 2019 #55

    John.Roo

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    Hello to Beaumont Lamar University!

    If you need some info plese contact me on
    storm.composites@seznam.cz
    We fly with electric propulsion from 2011. Beleive me that it is not that easy as it looks like. However I still beleive that it is a way in small sport aviation :)

    Best regards!
    Martin
    20190915_103921.jpg
     
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  16. Oct 17, 2019 #56

    wktaylor

    wktaylor

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    Aux power units [APUs] are typically engine-driven for electrical and hydraulic and bleed-air [sometimes] when the main [thrust] powerplants with their nominal electrical-power, hydraulic and bleed-air systems are not operating. This avoids the need for main engines running and extra ground connections and provides 'self starting'. SOME/NOT-ALL APUs can be operated in-flight for added electrical and/or hydraulic power, presuming one or more engines are INOP. Due to several complexities of integrating low electrical power generation and hydraulic power to the Acft with main engines running, this system is not routinely used in-flight for obvious reasons. HOWEVER... this APU mode of operation may be changing with new generation 'electric' [distributed system] aircraft.

    Ram Air Turbine [RAT] systems are generally deployed as a 'last-resort' for minimal electrical and [maybe] hydraulic power... when all-else fails... and are plumbed-into equipment/systems that are absolutely essential to maintain control and communications during power-loss emergency. These devices are typically housed inside the fuselage until deployment thru a 'door' at which time they extend out into the airflow... and the integral propeller begins windmill-driving small generator(s) extracting energy from the free-air-flow.
     
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