Heavy-Fuel Engines for UAVs

Has anybody tested those new heavy-fuel engines for UAVs (http://www.3w-international.com/1-cylinder-heavy-fuel-engine/)? I just saw the Aerosonde was flown about 10 days ago with a heavy fuel engine. Would you recommend them? Can you comment about their performance? Thanks for your comments.

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  • Why are they using heavy fuels?

    I have read than it is because STANAG 4671 but i can not find any reference than fuel to use:

    http://www.smalluas.com/download/DRAFT_STANAG_4671_28_MAR_07.pdf

  • Thanks Ryan.
    Do you know which heavy fuel engine Aerosonde are using?
    I presume from your remarks that it is normally aspirated.
  • Looks like this engine uses a carburettor. If one was going to all the trouble of a heavy fuel engine, electronic fuel injection might be worth considering.

    My 2 cents :-)

    Andrew.
  • Nothing amature would ever use something like this but here is some info worth reading IMO.

    back from 2004.
    http://www.spacedaily.com/news/uav-04zf.html

    Here is a presentation on heavy fuel engines
    www.hirth-uavengines.de/PDF/Heavy%20Fuel%20Presentation.pdf
    Hunter Unmanned Aerial Vehicle To Be Powered By Heavy-Fuel Engine
    San Diego CA (SPX) Jun 29, 2004 - The U.S. Army's RQ-5A Hunter unmanned aerial vehicle (UAV) will be able to climb faster, operate at higher altitude…
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