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macboffin

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About macboffin

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    RC-Cam Visitor
  • Birthday 12/19/1933

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  • Location
    London England
  • Interests
    Primarily UAVs, but also anything that flies, including birds, insects.
  1. macboffin

    live video

    Satellite link system? Works for remote controlled full size military Humvee's! Little matter of cost, and legality etc.
  2. Turbostangs reply good advice, fly around at increasing altitudes near the field and look for prominent features near the field. If you are really worried about it, keep a coloured smoke flare handy, if you get lost fire it up and look for the smoke! Good system if flying where there are few stand-out features.
  3. Definitely not at low levels. Higher you go the better. The "bumps" in the field are like air flow, the further from the obstacle, the less "bump" gradient. Imagine a small hovercraft flying over "Sleepng policeman" speed bumps at various heights, you can imagine the effect.
  4. Definitely not at low levels. Higher you go the better. The "bumps" in the field are like air flow, the further from the obstacle, the less "bump" gradient. Imagine a small hovercraft flying over "Sleepng policeman" speed bumps at various heights, you can imagine the effects. Flying alongside hills/ridges the 'plane wants to turn away , the sensor nearest the hill thinks it is higher than the other sensor. Very sensitive, two inches over a seven foot span gets a response. Biggest problem, having to recalibrate every time out, since the rate of voltage-to-height changes with weather etc. No doubt adequate computer power and suitable logs onboard could make it workable, but there are easier ways!
  5. macboffin

    Calculating Wing load

    Wing Loading? Twice the weight will raise stall speed by 25%. As rough rule of thumb, adding a pound of weight to an average 6ft span model will raise stall speed by about two mph. When stall speed equals max speed, you have a static display model, or something to practise high speed taxying with!
  6. macboffin

    fuel efficient engines?

    Enya model engines have now bought out a Diesel four-stroke. Note that kerosene/paraffin has , like "real" diesel fuel, more B.T.Us than eptrol or methanol, hence more urge per c.c.
  7. macboffin

    DiY Computer Built Using Relays!

    Sounds like Terry Pratchett visited this site for ideas for the Unseen University computer! Thanks for the heads-up!
  8. macboffin

    Small UAVs

    So foamie kit "Predators" will become illegal? This may be part of the growing Big Brother tendency of keeping everything secret. They hate Paparazzi commenting with pictures about their various naughtinesses, and aerial paparazzi could be even worse! Just how they propose to regulate things might be interesting, especially now that Spread Spectrum is coming on the market!
  9. macboffin

    I/C versus Electrical propulsion

    "Horses for courses!" Apart from the duration question, what about cost? Conversion from I.C. to electric power means a hefty outlay for decent motor, Li-Pos, charger, etc etc. For serious duration, serious battery cost,etc. OK once youve got it all, running costs are peanuts,just plug into mains,(or car battery). Plus, another consideration, ambient and operating temperatures, where I.C. engines are a lot less fussy. One good thing about electric, the engine doesnt run out of puff at altitude. Recently had the experience of flying at very high(ground) altitude with a small .32 powered vid plane.At sea-level, toss in the air and up like rocket. At altitude, run like heck and throw like a javelin, whilst not slipping in the snow! 50% nitro, (good for the engine life!) and a very modest climb rate. Landing, fly up the slope and stall it on for a bit of uphill sking!
  10. macboffin

    New 2.4Ghz Spread Spectrum R/C System

    The "Spektrum" 2.4 gigs system now available at higher power for all model aircraft. Produced by Helger Racing.
  11. Did a bit of research on this system at London U, details lost in the mists of time, (I've been flying since Pontius was a Pilot ha ha!) but do clearly remember that one disconcerting thing was that the Eath's static field has bumps over trees etc, (let alone hills) and also varies over water. We were looking into using it for terrain following for a mine detecting UAV. Gave up because it was too fiddly and twitchy!
  12. With due regard to all of the above,the approach to the project is not realistic, knowing the UAV industry world wide as I do, hands-on for more than forty years. I dont make my own nuts and bolts, or autopilots, I get serious bits that have been tested and proven and come with money-back guarantees. That way the Bird comes back also, (although in some quarters $100,000 birds are expendable). A Global Hawk augered in recently, just consider the developement costs alone as well as the price of the bird etc. sh*t happens, but a serious approach minimises it. A person capable of delivering what you want in one package will probably cost you what I consider adequate remuneration for a lot of years learning to do it right; around $5000 a month and stock options. Good luck!
  13. Right on Terry. Loops, rolls, and stall turns are great fun with target drones, (when the team leader aint in the picture!) but UAVs are quite expensive solutions to tactical problems, not toys! When up to ankles in mud wrestling with a dodgy launcher at three in the morning with an anxious Major wanting the bird in the air and on the job yesterday you appreciate that!
  14. There are many autonomous landing systems, all of them very expensive. Not a lot of point usually, easier to stand near the runway/strip and take-off/land using a hand controller ie Tx hand held. One auto land system is OMAR, look up Mission Technologies Inc, UAV company in San Antonio Texas.
  15. Have a little wire mast with some trailing string pointing at another wire mast with a white ball on the end. The string shows side-slip, angle of attack. Used on first world war aircraft!
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