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  1. #376

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    RE: SkyMaster MB339 Build Thread

    only one flame from uat fitting letting air intank. flys well.
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  2. #377
    wojtek's Avatar
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    RE: SkyMaster MB339 Build Thread


    ORIGINAL: idleup1

    only one flame from uat fitting letting air intank. flys well.

    is that R2D2 in the top right corner of that picture !!! ?


    Voy

  3. #378

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    RE: SkyMaster MB339 Build Thread

    Yes
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  4. #379

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    RE: SkyMaster MB339 Build Thread

    This is what mine looks like, it's a 170G , the inlets of the 339 are relatively small, and there is a ridge in ducting, for wing pipe, which I think deflects the air over tturbine my fuel piping is checked 100%
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  5. #380
    Gonzalo38's Avatar
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    RE: SkyMaster MB339 Build Thread

    In my MB-339, the air ducting goes straight into the turbine so the air is not going all over the fuselage. The fuselage has also some other openings on the side that could help with some extra flow of air and that could help to cool down some other components.
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  6. #381

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    RE: SkyMaster MB339 Build Thread

    That's interesting Gonzalo, is yours a Skymaster MB?
    pls take a pic of holes on side as you mentioned

  7. #382
    Gonzalo38's Avatar
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    RE: SkyMaster MB339 Build Thread


    ORIGINAL: savasn

    *That's interesting Gonzalo, is yours a Skymaster MB?
    pls take a pic of holes on side as you mentioned
    It is a Skymaster.

    Don't have a better picture right now, but you can still see that the plane has a couple of holes. Not too big, but at high speed it should provide some air flow.

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  8. #383

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    RE: SkyMaster MB339 Build Thread

    Had my maiden  on the weekend with my mb . Needed up elevator trim 4mm checked when landed .
    CG was set on middle of wing tube .
     flew well .
    Is this normal ?

  9. #384

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    RE: SkyMaster MB339 Build Thread

    if you can borrow or buy a cable you can download your memory and we can look at your flame out run and previous runs . The ecu records throttle position,rpm,pump pulse width, and exhaust temp every 1/2 second. xicoy or kingtech sells the cable. not very expensive.you can print a graph to see easier.


  10. #385

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    Set up my new Jeti transmitter in the MB-339.. love the both of them.Click image for larger version. 

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  11. #386

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    Had trouble keeping the outer gear door closed so added second
    air cinder. Click image for larger version. 

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  12. #387
    richbran's Avatar
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    I just dug up this older thread.
    The last flight well over three Years ago I (my son) had an engine failure and when the gear was selected down during the final glide the whole nose gear strut fell out. Murphy's law. The only lock screw had loosened. Not too bad though, but some damage to the nose gear bay and doors.
    First I sent the engine to JetCat to have it updated, a fault could not be determined however. Then I got too busy and some other projects passed, the MB collected a lot of dust.

    Now I took it up again, ordered a new thrust tube from IQ Hammer and UP mechanical gear valves.
    I took out all the radio components and most air and fuel tubing, I am gonna retrofit it all.
    In the mean time I improved myself in installing the radio components, which was not always my favourite part of the building. Whenever it functioned, I was OK, didn't care too much about excess wiring, or neat installing.
    Now I discovered the fun about that part, plus learned some more tricks the last few years since building the MB.

    Plus I bought and built a Pirotti Tuono in the mean time, with which a have flown a lot now, so I feel more confident to fly a large scale jet. A few Years ago I was always stressed when flying it.

    I wonder You guys are still owning and flying the MB?

    I will post some pics during the update.
    Regards,
    Richard

  13. #388
    richbran's Avatar
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    Here are the modifications to the fuel system, I'd never liked the rubber stoppers in the tanks.
    I had one friend make me some alu rings with stops, with M7 threads, so I could use FESTO 6mm connectors, I try to have 6mm all the way to the pump.

    For a vent for the saddle tanks I glued a strip of thick alu, drilled a hole and provided it with a M7 thread to take the FESTO 6mm right angle connectors. For the main tank, which has no room for a top mounted vent, I had my friend made a bigger unit that could take two FESTO couplings.

    To be able to get the tubes in from behind I drilled an M7 screw (difficult to find, even in EUR) so that I had a kind of "collar" which I could solder onto the pipes that go on the inside part of the tank.
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    Now I need to thoroughly clean them, add the rubber ring, screw tight and press test them.
    Regards,
    Richard

  14. #389
    richbran's Avatar
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    Made all internal piping, rinsed the tanks with water and compressed air and then with fuel.
    After mounting the stoppers I leak checked the with one bar, not even the slightest bubble to be seen..
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    Regards,
    Richard

  15. #390

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    I bought a used fb mb-339 last year and had a couple of flights on it so far. Floats on landing but all my Jets floats on landing ;-)
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    Last edited by basimpsn; 02-17-2015 at 08:23 AM.
    It's a hobby - keep it simple

    www.332ndredtail.com


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