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  1. qchen98

    Use of WEP (War Emergency Power) On GA Aircraft

    Can we have this sort of throttle setting on our continental and Lycoming engines, without modifications that are too complex? A temporary 10% boost in engine horse power could be quite useful if you are about to hit a tree during take-off, even at the cost of an complete engine overhaul.
  2. qchen98

    Affordable Homebuilt Aircraft Kit With Homebuilt CNC

    Could an aircraft design be optimized for production on a homebuilt CNC router table? A guy had indeed machined most components of a Cri-Cri out of his homebuilt CNC router, but that plane is quite complicated and it was not designed with CNC machining in mind. If a manufacturer offers a kit...
  3. qchen98

    Aircraft Building Speedruning Competition

    Hypothetical rules for this competition: -Single participant only -The type of aircraft is unknown to the participant -The first participant who finishes all the stages wins. Stage 1: -Build a quick build kit(something that adheres to the 51 Percent Rule) -Test fly it Stage 2: -Build a...
  4. qchen98

    Homebuilt Jet Pack Totally Possible

    Really thought this type of flying can only be achieved by men with extraordinary physical capacities, because the center of gravity of the human is way above the the thrust vector of the jet engine which make the aircraft inherently instable. It is can be presumed that the jet pack doesn't...
  5. qchen98

    Homebuild Mustang In China

    How much are you willing to bet that this thing can fly? It is slightly underpowered in its current configuration (80hp 8000rpm engine, 3000rpm prop, direct drive), but the possibility of an engine swap cannot be overlooked. He can also push the aircraft down a slope to gain some...
  6. qchen98

    Very Cheap Homebuilt Coaxial Helicopter

    There have been many listing of coaxial helicopter here. Way more than any fixed wing ultralight. The complete airframe that you saw flying is currently selling for $1,2000(w/o the rotax because it had exploded, according to the owner). A brand new rotor assembly(everything you see on the last...
  7. qchen98

    Two engines one prop

    I've only heard of this power configuration existing in the german He-177 bomber but never heard of any example in the GA world. Why hasn't this power configuration gained any popularity? I can see many advantages to this approach: A PSRU is mandatory for an autoconversion engine or a...
  8. qchen98

    Mass Production of The Cheapest Airplane Ever

    Imagine that the communist party leader in your country envisioned a plan to give out free two-seater airplanes to every family. Your mission is to come up with a cost-effective design whose manufacturing process is optimized for large-scale production.Performance-wise, the aircraft should be...
  9. qchen98

    Could the Working Class Afford a P-51?

    What is the modern equivalent of owning and operating a civilian warplane that is bought as a surplus immediately after the end of WW2? Let's assume maintenance is performed as that as little as possible - you don't repair the broken parts but simply find a replacement from another surplus...
  10. qchen98

    Extreme High Altitude STOL Aircraft for Everest Ascent

    Is it possible to design a piston or turboprop-powered STOL aircraft that could reach FL290 and perform at least a touch-and-go on the top of Everest? Preferably the aircraft should come with tundra tires, so a full-stop landing can be a possibility on other peaks with flatter terrain.
  11. qchen98

    Chinese Delivery UAV with 12,000 lbs MTOW in Full Commerical Operation

    A fleet of nine UAVs are now running delivery service in northwestern china.
  12. qchen98

    Design Challenges: High Performance Aircraft For Kids

    Study case 1: an FAI record-breaking aircraft in the sub-300kg class - with the assumption that the sole occupant of the aircraft is less than 4 feet in height and 50 lbs in weight. I've been thinking about converting an AR-5 for children's use- however, it is doubtful whether such conversion...
  13. qchen98

    Mechanical Moving Map

    Does anyone have an idea about how does that device on the Mi-24 work? I'd really like to make one myself. How does this thing support both horizontal and vertical scrolling without it tearing up the paper? Also, if I'm to import a Mi-24 into the U.S, would the device be compatible with FAA...
  14. qchen98

    Operating an airplane without a valid driver's license

    It would be better off getting myself 3rd medical. This post is beyond meaningless. Please delete this, admin. Has anyone done a checkout for an LSA rental without presenting their driver's license? If you've done so, do they check your driver's license vigorously? My U.S. DL license has...
  15. qchen98

    The ULTIMATE time-building-specific twin jet! Multi-engine turbine time for as little as $30/hr!

    Update 10.15: Added professional 3d rendering.(Background image are from wikicommon) Mission Profile: Causing a massive headache to the FAA! Creat a world-record for annual insurance premium in its class A certified twin-jet aircraft with absolutely the lowest hourly operation cost...
  16. qchen98

    Would you buy a $13,700 Chinese Aerolite 103 Clone (Ready-to-fly)?

    The Chinese seller quoted a price range from CNY 20,000 to 100,000 ($3,106 to $15,530) for this aircraft. According to him, CNY88,000 will buy you a ready to fly aircraft(unknown engine option), plus includes a 3-hour flight training session and free shipping to most area in China. Well, it is...
  17. qchen98

    Another new member from China

    I've had a PoA account for almost four years. However, my first and only post about an ADS-B guided missiles system had got me permanently banned there. I later apologized to the forum board via email about my crippling trolling behavior, but that didn't work. Background: Finished my PPL for...
  18. qchen98

    Sailplane with a Extremely Small Electric Motor (1.5kw)

    Edit: Someone pointed out that it makes way more sense to use an electric propulsion system than pedaling, as even a small motor can put 2 - 3 times the voltage that an average cyclist can produce. The goal is still the same - extend the glide ratio of an e-powered ultralight glider, so the...
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