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Galeb G2 - new jet made in Serbia

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Old 03-26-2013, 01:15 PM
  #101
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Default RE: Galeb G2 - new jet made in Serbia

Great work Mirce,
You have inspired me, I am thinking of getting back to building.
Looking forward to the final product.
jef
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Old 03-26-2013, 06:09 PM
  #102
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Default RE: Galeb G2 - new jet made in Serbia

Thank you guys for kind words, hvala Marko...

This topic will be some kind of manual for future G2 builder...
For now it's interesting for modelers which like to made kits. I think that with Ziroli's Panther, no many wooden jet model kits on the market. In this size for certainly...

I continue my work with planking both fuselage sides parallel...



I add next 20 mm balsa plate on upper air intake fuselage part...







Next was gluing balsa plates in front of the air intake, and on the fuselages sides...













Than I done two jobs, glued 10 mm thin balsa plate on the top of the upper part of the fuselage, and add filler and sand it, to check how look transit from air intake fuselage part to upper fuselage part...














Than I add balsa plate in front of the intake, and other 20 mm plate in te midle of the intake segment curve...










While the glue dries, I put elevator on fuselage. This time I want to check aligment with part which is in front of it...








Next step was to add all balsa planks on fuselage sides. It need to be trimmed every plate to fit exactly in place. For this needs a little time. Don't forget to wet every part with hot water. Hot water allow easier shaping of balsa planks.






Finally time come for sanding left fuselage side...











For now everything looks very good...

Regards

Mirce
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Old 03-27-2013, 01:10 PM
  #103
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Default RE: Galeb G2 - new jet made in Serbia

The planking is going on well
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Old 03-27-2013, 01:28 PM
  #104
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Default RE: Galeb G2 - new jet made in Serbia

really nice to follow this project... do you plan to make wood kits for the jet, or make fiberglas version?
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Old 03-28-2013, 12:50 PM
  #105
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Default RE: Galeb G2 - new jet made in Serbia

Yes, planking is going pretty good. It's boring process, but more time you invest in that, it's will be better.

Kasper, I will offer wooden kit with some parts which is required for building. I'll not made fiberglass version of G2...

In meantime, I was working on Galeb. Heat from our tile stove I used for quicker dry of removable nose section...





That part consist from many short but very curved balsa plates. It's impossible to made it in one step...







Yesterday I filled all gaps on right fuselage side...



Than I separated fuselage from working table for first time... How big is it?

G2 near Meister Zero...



... and near Ziroli's P 38 fuselages...



Galeb's fuselage is long little over two meter...

For further working I must put fuselage up side down...





I wondered how look exhaust tube in the fuselage...



But, before I put it inside I need to cut down the lower part of some ribs.





Than I put tube from the rear of the fuselage...



Front part of thrust tube will be put in position from wing hole...



Tube is 5 mm smaller than hole on the last rib...





When I cut ribs, I saw that lower rib part, in which will come hard wood for wing screws, can be maybe weak. So I call Martin and he will made two extra ply parts, which will come in font and behind of this rib part...







Finally, I put for the first time wing on the fuselage...



It lie down very well on both side of the fuselage...

Right side...







Left side...





In front of this part I will made one more rib also...



I take down wing for now and start working on the front part of the fuselage. I add removable nose part and it is aligned pretty good on the fuselage...





Than I instal landing gear. First I glued two hard wood plates, and than I put landing gear in position.



Initially wheel was little to close to the landing gear doors (that is for this experiment balsa plate), but after adding few wooden parts I made it to be better...





And for the end of today's topic, I measure fuselage weight in this stage...





Scale show...



...or 2,98 pounds

Regards

Mirce
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Old 03-29-2013, 01:56 AM
  #106
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Default RE: Galeb G2 - new jet made in Serbia

Mirce, your work is outstanding, like always.

I think you could use much thinner plywood for fuse ribs, like 3mm on parts that suffer the greatest load and 2mm on all others.

You are using 3mm balsa for sheeting, plus you will use glass fiber on top of that which will give high strength shell.

Above all jet engine does not produce vibrations, not in close like 2 cycle gas engines.

M.
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Old 03-29-2013, 02:42 AM
  #107
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Yes Marko, that's truth, but 4 mm ply in AA quality was only dimension I can find when I was bought material for G2 project.
In mean time I was trying to find 3 mm ply in same quality, but here in Serbia, I can't find it.

Other thing is that jet fly much faster, so loads on structure are higher. But, after this building, I saw that 3 mm will be enough. All parts, wing and fuselage, are enormously strong.
I calculated, in case that I was using 3 mm ribs, instead of 4 mm, different in weight on wing will be about 250 - 300 gr... Not more...

Few day ago I ask my friend in Hungary to try to find me 3 mm ply in AA class, so hope that he will help me...

Martin made complete new Galeb G2 drawings with 3 mm ply ribs, and I will made new model with all modifications. One of most important are thinner ribs...
Just need to find good, even 3 mm ply...

4 mm ply will be good for next project - G2 in 1/4 scale...

Regards

Mirce
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Old 03-30-2013, 06:03 AM
  #108
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Default RE: Galeb G2 - new jet made in Serbia


Quote:
ORIGINAL: mirce

4 mm ply will be good for next project - G2 in 1/4 scale...
Bigger is better :-)

M.
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Old 04-01-2013, 12:09 AM
  #109
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Default RE: Galeb G2 - new jet made in Serbia

Or...more scratch built models are better
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Old 04-01-2013, 02:30 AM
  #110
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Default RE: Galeb G2 - new jet made in Serbia

Yes, Marko that's right... It's always be like that...

Kimhey, don't worry, next project will be scratch, again... Best from "both world", big and scratch...

Back to Galeb...

My friend Dragan, he is "guilty" for those perfect fitting parts, he is owner of laser cut machine...



By the way, Dragan bring me some more parts...



Some of them I immediately installed...







Front part of rudder I was made from balsa, but it need to be from ply, so I change it...





Same "story" is with parts between elevators...









I made one more half rib, to strengthen rib in which come front wing joiner...



I install two hard wood blocks for front landing gear...



Servo in front is for driving...








Galeb have three front landing gears doors. In front is doubled and behind them is one single door. For those double doors I need to made construction which will carry them. That part, with doors, will stay on fuselage...







Than I install vertical parts in which I will lately screw door hinges...







Finally I cover those parts with balsa...





Job of fuselage covering was continued...



It's important how will apply first planks, because they give fuselage shape transitions...

















On very curved shapes this was best option (for me) to covering it...













To be continued soon...

Regards

Mirce
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Old 04-01-2013, 02:21 PM
  #111
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Default RE: Galeb G2 - new jet made in Serbia

As I promise...













But, after first sanding...











And, check this out...

















He, he...

Regards

Mirceangelo
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Old 04-01-2013, 02:40 PM
  #112
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Default RE: Galeb G2 - new jet made in Serbia

Beautiful Mirce!
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Old 04-02-2013, 12:20 AM
  #113
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Default RE: Galeb G2 - new jet made in Serbia

Suggestion Mirce:
Is there any chance of you obtaining a different nosewheel retract unit (cylinder pointing to the rear of the plane) so that you may be able to hook a controlling servo to the unit itself instead having control wires around the retract unit. Otherwise this has been (and still is) a very nice build. Congrats!

Reuben
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Old 04-02-2013, 02:20 AM
  #114
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Default RE: Galeb G2 - new jet made in Serbia

Thank you on kind words...

Unfortunately, nose gear must stay in that position. I wrote earlier that I install nose gear to come inside backwards in fuselage, but after remarks of one my friend to take closer look about nose gear geometry on real G2, I change design.
In this situation servo must come in the front.
That's truth, cables will go around nose gear, but I have idea to made some small springs, which will make tensions and move cables further when they start to be loose...

Problems can occur on bad landings if nose gear go backwards. On my Panther I have situations that I bend nose gear backwards on landing. In that case, because servo is behind, wires become loose, but in Galeb, wires will get more strained.
I will see...

Anyway, thanks for suggestion...

Regards

Mirce
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Old 04-02-2013, 02:57 AM
  #115
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Default RE: Galeb G2 - new jet made in Serbia

Superb scratch built project. Really nice to see a plane built he hard way and so quickly!

I see that you have the excellent Behotec retracts. I have them in several of my planes with the servo mounted on the leg itself. This avoids the wire steering.

http://m.youtube.com/#/watch?v=_F2eL...%3D_F2eL4_3OzM

The c40 has the cylinder at the front and steering behind. The c50 has the standard retract with bulkhead mount and he servo mounted at the side. These mounts are not easy to find on Behotec web site, better to look at Altecare web site.

John
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Old 04-02-2013, 05:02 AM
  #116
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Default RE: Galeb G2 - new jet made in Serbia

You can use solid wire in the place of cables - a system I made up on a Eurofighter is shown but depends on the installation....

marcs
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Old 04-03-2013, 11:13 PM
  #117
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Default RE: Galeb G2 - new jet made in Serbia

Thank you guys on ideas. I'll try this with steel wires, but not sure will it work, because position wires on retract is much higher than servo. But, as I told, I'll try...

In meantime working continued and front part of fuselage is almost finished.







Good for me is that I'll not need to add a lot of acrylic filler, so prepare for glassing will be easier.

Next step was placing wing on fuselage. I was putting wing earlier but now I need to glue thin ply - wing ledge...
Martin send me drawing of this part, Dragan cut it on laser cut machine and shape of fuselage ribs give exactly position.







Later...











I must work on wing too. First I need to glued leading edge and make exact form.





Than I made position of the first rib which come on the wing. I put and took off few times wing from the fuselage before was satisfied with rib position...

















Same story was with last wing rib. It was glued when wing was on fuselage, so I need to put nylon to separate it from fuselage.





For now wing on fuselage look like this...





Last job yesterday was to add other wing ribs which made form for "wing belly"...





Today I must made rear part of the wing which come on fuselage, but that will be easy...





Regards

Mirce
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Old 04-03-2013, 11:48 PM
  #118
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Default RE: Galeb G2 - new jet made in Serbia

very nice.
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Old 04-04-2013, 05:07 PM
  #119
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Default RE: Galeb G2 - new jet made in Serbia

Thanks Kasper...

Today I made last step before putting my Galeb on the wheels - install screws for fixing wing...







Than, first pictures on wheels...







I put together Ziroli Panther, and try to made best angle to show different in sizes of this two models...















Regards from Novi Sad, Serbia

Mirce
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Old 04-04-2013, 10:40 PM
  #120
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Default RE: Galeb G2 - new jet made in Serbia

Mirce....you seem to have a winner plane there Very nice and keep it up!
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Old 04-05-2013, 07:07 AM
  #121
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Default RE: Galeb G2 - new jet made in Serbia

Normal 0 21 oNotOptimizeForBrowser/> Mirče
Izvrstan modelarski rad.Imate pobjednički tim,posebno momka koji radi CADposao.
Pozdrav
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Superb modeling.You have a winning team,especially the guy on CAD work.
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Old 04-08-2013, 10:44 PM
  #122
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Default RE: Galeb G2 - new jet made in Serbia

Thank you in name of all "our team"... Hvala Dragane...

Work on G2 continues...

Few days ago I made bottom wing construction...














Rear end of the wing, part which is on the fuselage is on position too. It's not finish yet...






Finally I glued tail section...





Elevator is parallel with the wing...



First I was glued elevator, and next day rudder.





Because I must add glue inside of the rudder and fit ply guide, I glued just one rudder plank earlier when I made it.



All parts fit perfectly...



Servo cover in same time keep servo in position inside of the rudder... When I made picture I wasn't cut slot for servo arm yet...






Servo wires come inside of the fuselage. You can see opening of the pasteboard tube in front of the servo wires. Trough last three fuselage ribs will come plate which does not allow wires to touch hot exhaust tube. For now you can see just flat slots for that small plate...



Tube for tail servo wires...




I add one more ply ring on the rear rib of the fuselage. It will strengthen last rib...




When glue on rudder - elevator join was dry, I add right rudder side. Same like everything else, it fits like "buttocks to the potty"...








Wing saddle fit perfectly too... I start working on transition from saddle to the fuselage...






OK, that's all...

Now I must go to workshop to continue building, because few modelers contact me and asking about Galeb G2. It's very possible that I will made soon two - three more G2 models.
As you know, I will sale a kit of this model, but I can made it, like ARF, for customer too.
If I need to build few more G2, that will be busy modelling year for me...

Regards

Mirce
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Old 04-09-2013, 02:40 AM
  #123
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Default RE: Galeb G2 - new jet made in Serbia

great looking. kepp up the good work!


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Old 04-11-2013, 05:29 AM
  #124
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Default RE: Galeb G2 - new jet made in Serbia


Quote:

Now I must go to workshop to continue building, because few modelers contact me and asking about Galeb G2. It's very possible that I will made soon two - three more G2 models.
As you know, I will sale a kit of this model, but I can made it, like ARF, for customer too.
If I need to build few more G2, that will be busy modelling year for me...
It is wonderful news Mirce. You are doing a fantastic job on this build. This is an appropriate reward for your effort. I'm curious, is that local R/C builders are interested, or we have a chance to see G2 across borders? Who knows, maybe Top Gun?

Regards, Bato

Novi Sad, Serbia
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Old 04-11-2013, 02:54 PM
  #125
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Default RE: Galeb G2 - new jet made in Serbia

Thank you on kind word... I hope that few model will fly on Serbian sky also...


Last few days was finally like spring, so I can working in work shop, but in front of it also...




Nice weather I used for starting my Jet Cat P 80 first time after winter pause. Turbine start without any problem, so I hope that at next week I'll go and fly it.




In next few days on Galeb I shall finish all work before glassing. In last few days I made big progress on model.
First, I finish almost everything on rudder...















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Than same on other rudder side...




I made few new stripes on upper fuselage side...










I used to add acrylic filler on fuselage. Fuselage is not finish yet, but I want to see how it will look with filler. All curves are now so smooth...
For now, about 70% of fuselage is finished, and ready for glassing.



















Front part... Check how sharp are edges around front landing gear...












At the end, few pictures after today work. It's not everything sand yet...












Regards

Mirce
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