Air powered miniature engines

Discussion in 'Hangar Flying' started by galland, Jul 17, 2019.

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  1. Jul 17, 2019 #1

    galland

    galland

    galland

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    Hi Guys, Was just wondering if some of you might like to see some of one of my hobbies. I enjoy making miniature engines that run on compressed air. The larger one is approx. 7 inch in dia. The smaller one about 3. Now if I can figure out how to post photos. Gary

    IMG_0688.JPG IMG_0689.JPG IMG_0281.JPG IMG_0680.JPG IMG_0690.JPG IMG_0684.JPG
     
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  2. Jul 17, 2019 #2

    pictsidhe

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    Mods? This thread belongs in the porn section.
     
  3. Jul 17, 2019 #3

    proppastie

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    So how many minutes might I get with a scaled up version. I am thinking 10000 psi CF tank, for a power launch UL glider.
     
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  4. Jul 17, 2019 #4

    Daleandee

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    Very cool hobby you have there. Years ago I remember seeing some air powered cars. Zero Pollution Motors is still making them.

    https://zeropollutionmotors.us/

    I wonder what it would take to air power an aircraft ... or if it's even in the realm of reality ...



    Dale
    N319WF
     
  5. Jul 17, 2019 #5

    Tiger Tim

    Tiger Tim

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    Neat! I was all hot to build an air motor a few years ago, even made most of the pieces for a Pachasa opposed twin. Gotta get back to that thing some day.
     
  6. Jul 17, 2019 #6

    Victor Bravo

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    Congratulations General der Jagdflieger, they're beautiful. Are you doing it the same way as Gasparin, or do you have a different design?
     
  7. Jul 17, 2019 #7

    BJC

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    You must have a really good compressor.


    BJC
     
  8. Jul 17, 2019 #8

    fly2kads

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    Those are pretty neat! Do you have any videos of them running?
     
  9. Jul 17, 2019 #9

    galland

    galland

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    These engines are not designed like the Gasparin's or other CO2 powered engines so they do not have the ball and pin in the piston/head. They both use a rotary valve system on the rear half of the crankshaft to deliver air to the ports that feed the cylinders. I did not invent this system but rather copied it. The small one uses this for power and exhaust but on the large one I decided to try a cam working the rocker arms which open the conventional valve in the head. Gary
     
  10. Jul 17, 2019 #10

    radfordc

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    I have built several air engines, too. [/ATTACH] IMG_20190717_075927240.jpg IMG_20190717_075948817.jpg IMG_20190717_080009277.jpg IMG_20190717_080000278.jpg
     
    Last edited: Jul 17, 2019
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  11. Jul 17, 2019 #11

    radfordc

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    They run too.



    Poppin' John

     
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  12. Jul 17, 2019 #12

    Aerowerx

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    The ultimate...

    You could have an electric motor driving a compressor. Batteries to run the motor, and solar cells to charge the batteries!;) "Tree huggers" would have nothing to complain about then!
     
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  13. Jul 17, 2019 #13

    radfordc

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    How about turn a propeller with the compressed air motor, use the prop blast to turn a windmill generator, which powers the air compressor.....perpetual motion!
     
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  14. Jul 17, 2019 #14

    Victor Bravo

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    Where do we send the investment checks... to Moller's address ?!?!
     
  15. Jul 17, 2019 #15

    proppastie

    proppastie

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    this looks very interesting to scale up or as a ICE or steam......any more information on the basic design?
     
  16. Jul 17, 2019 #16

    Aerowerx

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    Can you say "Half VW"?;)
     
  17. Jul 17, 2019 #17

    radfordc

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  18. Jul 17, 2019 #18

    proppastie

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    maybe for ICE, but otherwise I have never seen a more simple design of an engine.....what an elegant design.
     
  19. Jul 17, 2019 #19

    galland

    galland

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    Those are some nice engines radfordc. I have a somewhat version of a John Deere. I have seen Chuck Fellows design and altered it to come up with mine. Gary

    View attachment 86823
     
    Last edited: Jul 18, 2019
  20. Jul 18, 2019 #20

    Dana

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    When I was 16 I built an engine using brass tubing, soldered together. Piston and cylinder were the adjacent telescoping sizes, around 1/2" diameter, the slide valve made from smaller telescoping sizes, sheet stock for the frame and cylinder head, bicycle spokes for connecting rods. It would run on mouth pressure, give it 10-20 psi and it would really get moving. Later I made a steam boiler for it using an empty propane bottle sitting on a cutout paint can with a wood fire in it. The fire of twigs didn't do it, of course, so the Bernz-O-Matic torch came out I had a good head of steam in no time. Between the higher pressure and the heat of the steam, the solder joints let go and the engine fell apart. I wish I had a picture, maybe some day I'll try to recreate it.

    The same year I converted a Briggs & Stratton lawnmower engine to steam, modifying the cam with gobs of braze which I then hand filed to the new profile. It too ran great on compressed air up to 100 psi, my high school shop teacher welded some 8" pipe into a boiler which he set on the forge (scary!) to heat until it was at 100 psi, and we ran it until it seized. I had adolescent daydreams of it powering a model aircraft carrier built on a canoe hull, with R/C airplanes taking off and landing from it, which naturally never happened.
     
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