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  1. Solarsail

    Exhaust fan on velomobile doubling as propulsion

    Wait a minute. I have been told that propellers with a duct (is that a fan?) are more efficient because the inflow and outflow is axial, and thus all the momentum add up. Without a duct, there is some radial momentum both in and out that do not contribute to thrust. Why are turbofan engines...
  2. Solarsail

    Exhaust fan on velomobile doubling as propulsion

    Sorry to hear that. R.I.P.
  3. Solarsail

    Exhaust fan on velomobile doubling as propulsion

    How do you wind tunnel test? At your local car wash center? :D Is there a modeling package for props that is easy to use?
  4. Solarsail

    motor glider project

    Glide ratio is pretty decent. I don't get it. Is this a single occupant ultralight or an RC plane? How can you fit it inside a car? For an RC plane, you can easily get away with 200W. Or is it a paraglider? For a powered paraglider, I believe the engines used are about 20 to 30...
  5. Solarsail

    motor glider project

    Yes, and I did not claim that the L/D ratio is sufficient to determine power. In fact I did not even talk about L/D ratio. I talked about absolute drag (and lift efficiency). Larger planes have higher drag values, and thus need more power. And the more weight, the more lift is needed, and...
  6. Solarsail

    Blackfly AEV

    I doubt they will be interested. Their drone probably can't lift more than 20 kg, and that 'pilot' in the cockpit is fake. They never show a live human in there while in flight.
  7. Solarsail

    motor glider project

    It depends on the drag and lift efficiency of the AC. I think 10 kW is feasible, but would need a glide ratio of about 12:1 or better. Gliders with glide ratio of 30:1 have reported below 10 kW power. Do you have a project in mind?
  8. Solarsail

    Converting a MONI motor glider to electric

    Actually am building ten modules, each about 300 18650 cells. So that is about 3,000 cells. These plastic grids and spot welders make the job pretty easy. And I can use new cells. And get much better density than Volt used packs.
  9. Solarsail

    DIY ultralight, Retro biplane style, twinprop

    Interesting video @topspeed. Do you know where all the e-fly people in this forum have moved to? This place seems pretty dormant? Stay safe, SolarSail
  10. Solarsail

    Exhaust fan on velomobile doubling as propulsion

    Hi -- off topic This subforum on electric aircraft seems to be dormant. I wonder if participants have moved to another forum, and what that may be? Or is it that all interest in electric aircraft has ceased everywhere? :o Where can I find electric aircraft projects being discussed? My...
  11. Solarsail

    Converting a MONI motor glider to electric

    Shouldn't be too difficult welding 18650s with a tack welder? And using those plastic brackets to form the grids? Not that I have built this, but am planning to build. I don't think one can beat 18650 in the energy to weight density category?
  12. Solarsail

    motor glider project

    Any progress on this interesting project?
  13. Solarsail

    Blackfly AEV

    This video is fake - I am pretty certain. There is no such electric (or otherwise) aircraft that looks like this and can carry a pilot. Those propellers can't even lift enough batteries for a 30 minute flight.
  14. Solarsail

    Thread for new battery breakthrough PR releases

    Most important measure is Wh/kg (or kg/kWh), which the press release omits, and makes me suspect that it is not very good. The Wh/L of 360 is almost half of commercial batteries today (of 630 Wh/L). So it makes me suspect that their energy density is low.
  15. Solarsail

    Thread for new battery breakthrough PR releases

    Sorry to disappoint. But 360 Wh/L is so low that few automakers will be inclined to use this. There is no indication of the energy capacity of this technology, in the article. Makes me think that the energy capacity is about half of today's batteries. 18650 by Panasonic, volumetric energy...
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