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SkyMaster MB339 Build Thread

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Old 06-22-2013, 07:33 PM
  #376
idleup1
 
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Default RE: SkyMaster MB339 Build Thread

only one flame from uat fitting letting air intank. flys well.
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Old 06-22-2013, 07:35 PM
  #377
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Default RE: SkyMaster MB339 Build Thread


Quote:
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
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Old 06-22-2013, 07:44 PM
  #378
idleup1
 
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Default RE: SkyMaster MB339 Build Thread

Yes
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Old 06-22-2013, 11:27 PM
  #379
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Default 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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Old 06-23-2013, 04:37 AM
  #380
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Default 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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Old 06-23-2013, 06:07 AM
  #381
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Default 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
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Old 06-23-2013, 12:31 PM
  #382
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Default RE: SkyMaster MB339 Build Thread


Quote:
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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Old 06-23-2013, 04:53 PM
  #383
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Default 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 ?
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Old 06-24-2013, 03:08 PM
  #384
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Default 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.

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Old 12-07-2013, 06:34 AM
  #385
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Set up my new Jeti transmitter in the MB-339.. love the both of them.
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Old 12-09-2013, 05:32 AM
  #386
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Had trouble keeping the outer gear door closed so added second
air cinder.
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Old 01-11-2015, 02:49 PM
  #387
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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.
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Old 02-15-2015, 11:46 PM
  #388
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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.


Now I need to thoroughly clean them, add the rubber ring, screw tight and press test them.
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Old 02-16-2015, 09:42 PM
  #389
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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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Old 02-17-2015, 06:12 AM
  #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 06:23 AM.
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