Blog

Marabu newest motor

Posted by ultralajt on October 27, 2012 at 1:00 PM Comments comments (0)

I have just recieved new electric motor for my MarabuI!

It is 100 grams heavier than curently installed, but I will remove 100 grams of ballast from the firewall and will stay at same weight, yet almost twice the power !  8)




Marabu plans

Posted by ultralajt on October 14, 2012 at 3:00 PM Comments comments (7)

Marabu Plans are almost finished! :)

When finished, will be available in my webstore.


Generic Print Cartridges from ebay sucks!

Posted by ultralajt on February 9, 2012 at 6:40 AM Comments comments (0)

I purchased second hand plotter HP Designjet 600 to plot plans on large paper.

As there was some pretty cheap generic Print Cartidges available on ebay, I purchased two pairs.

But unfortunately these cartridges are not good as color drips from nozzles even when plotter dont working!

Also the printout is far from quality and it was kind of lottery it the print will be O.K.when came fout from the plotter or just another sheet of paper to be thrown away.:(

So, I purchased original HP cartridges and now printouts are flawless. :D

At this moment I am plotting plans for the building of Cirus HS 62 sailplane.

Boy, it is huge!!!

CIRUS HS-62 WING CORES

Posted by ultralajt on February 8, 2012 at 2:05 PM Comments comments (0)

Today I finished with hotwiring the wing cores from dense styrofoam.


CIRUS HS-62

Posted by ultralajt on February 5, 2012 at 12:20 PM Comments comments (0)

I prepare almost all materials for building CIRUS sailplane.

Epoxy resin and hardener, 163 gsm, 80 gsm fabric, glass tape, peel ply, abachi ....

Just waiting for temperature to rise a bit, as it is not nice to be in cold workshop. Also for proper curing of composite I need proper temperature.

Giant Parkflyer...19

Posted by ultralajt on November 13, 2011 at 12:20 PM Comments comments (0)

Some photos made today:


Giant Parkflyer...17

Posted by ultralajt on November 2, 2011 at 12:20 PM Comments comments (0)

I finaly complete decoration of the model!






In the meantime, I made some more flights.


See the videos:


Aerobatics included in this flight:

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Calm flying:

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A video made during Marabu flight, but camera installed on the landing gear strut.

No part of Marabu visible on the video. Video is about 10 min long:

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Enjoy!!



Giant Parkflyer...16

Posted by ultralajt on October 26, 2011 at 7:35 PM Comments comments (0)

Hi!


Model fulfill all my expectations and of course design goals! :)


Here is some videos:


Video with some music background:

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Video of first flight ever:

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Video of third flight:

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Enjoy!


BTW, I did not manage to cover model with decoration... will do in next days!



Giant Parkflyer...15

Posted by ultralajt on October 23, 2011 at 1:40 PM Comments comments (0)

Today my Marabu made first hoop trough an air!

I simply run, toss it, and moment later I catch him again.

It look sit will be real slowflyer.

See for yourself:

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Othervise I can say, that model is RTF... Ready To Fly.

Of course there is still some minor details to finish, and some decoration.."paintjob" to do.

I am waiting now for the proper weather.




Giant Parkflyer...14

Posted by ultralajt on October 12, 2011 at 8:20 AM Comments comments (1)

Yesterday evening I install servos for the rudder and elevator. Then I use a steel cable to connect the rudder, and one carbon tube (4mm) for the elevator pushrod.


To prevent sideway bending of the tube, I stabilise it with a plastic guide.


As steel cables for the rudder crosses itself in the fuselage, I route them troug a short plastic tubes. These tubes I clamped onto construction that rubbing od one cable to another is prevented.



I made another template for a windshield. This time it is curved one and I think it will be used on the model.


Accidently i found in my workshop a dashboard of one crashed model. I intend to install this one in my Marabu, or make another... all depends of my time and willnes.


Giant Parkflyer...13

Posted by ultralajt on October 9, 2011 at 7:15 PM Comments comments (0)

Today I use some sunlight to make photos outdor. It seems as model is in ARC stage, but looking closely, there is many tiny things to finish, before it will came to covering and RC equippment installation.

But I am happy that a progress is evident... so maiden flight is closer and closer! 8):P


Photo above: First time outdoors with all main components!


Photo above: Inspector checking the situation! :roll:






I intend to tow some small&lightweight gliders probably. Thats why I installed a towing release mechanism.



Othervise i made a pretty mess in my workshop . It is hard or sometimes even impossible to find some tiny bits I need at assembly...  :mad:


I need to clean workspace..... :)

Giant Parkflyer...12

Posted by ultralajt on October 2, 2011 at 1:55 PM Comments comments (0)

Today I started to assemble another wing half.


I install (glue) aluminum sleeves into a rear fuselage for the horizontal stabilizer joiners.

That way joiners could be replaced if something bad happens...



Giant Parkflyer...11

Posted by ultralajt on October 1, 2011 at 1:10 AM Comments comments (0)

Today I take right wing out from the assembly board. Of course, first thing that interested me was the weight!

Wing as shown on photos below, weights 270grams. (Reminder: Wing dimension is 38 by 125 cm ... 15" by 49")

Now, there is no more much to add and work on the wing. I need to sand the leading edge, and all surfaces, separate flap and aileron from the wing, add reinforced rib at the root, add two small joiners at root wing.. and of course cover it.

But covering will be done when the oposite wing will be finished.

Wing in its rough form. None of the sanding done yet....

Note the washout of teh wingtip. I hope it will add to harmfull stall flight behaviour.

Wondering about an airfoil? It is SPICA.




Giant Parkflyer...10

Posted by ultralajt on September 28, 2011 at 1:20 AM Comments comments (0)

Not much work done, but I manage to attach right wing to the fuselage using adhesive tape, to make some photos....

I hope, that work will continue faster over next weekend.

Giant Parkflyer...09

Posted by ultralajt on September 27, 2011 at 6:15 AM Comments comments (0)

Right wing half is advancing on the assembly board.

It is going together pretty fast without any major obstacles.

As nose planking is very thin (1mm balsa only) I glue additional stiffener along top of nose ribs. (photo above)


Glueing top nose sheeting. (photo above)



Giant Parkflyer...08

Posted by ultralajt on September 22, 2011 at 2:40 AM Comments comments (0)

It is time to jupm on Red Bull, for my model to get wings! :) :)

Last evening I manage to put wing planform drawing on the work table, and even starts to do some parts.

I made all four wing spars. They are of spruce caps and balsa shear web.

Today I will start to do actual assembly!




Giant Parkflyer...07

Posted by ultralajt on September 22, 2011 at 2:35 AM Comments comments (0)

It was time to roundup the nose of the fuselage, by assembling the engine cover.I use thin plywood and balsa. Air intake is not yet at its finished shape, and I still need to roud more some corners.

I need to find some lightweight spinner as it will look a little more "aeroplanish" :)



Giant Parkflyer...06

Posted by ultralajt on September 19, 2011 at 12:25 PM Comments comments (0)

Today I take horizontal tail from the workbench and roughly sand it.

Then I put it on the fuselage to see what is now the awerall weight of finished work.

Scale shown 760 grams, for parts as seen on the photos:





Giant Parkflyer...05

Posted by ultralajt on September 18, 2011 at 1:55 PM Comments comments (0)

Today I completed fuselage, glue vertical fin to it, and start building horizontal tail.


Some photos of the fuselage:


Close photo of the fuselage. Diagonals will strenghten fuselage against torsion.




Horizontal tail on the workbench. UPS battery came handy when one need weight.

Note: Spars and ribs are made as "H" profiles to be light and strong.

Horizontal tail will be removable and will have carbon joiners trough a fuselage. I install aluminum tubes (rolled from a very thin lhipoplates) in stabilizator. On close to LE and another inside a stab. spar.

I need to do some minor work at root part of the stab, and tomorrow probably reloease parts from workbench, trim, sand and finish by installing to the fuselage.

I will see the strength. If not as I expect, will make some tensioningg wires between fuselage, hor. and vert. stabilizators.


Giant Parkflyer...04

Posted by ultralajt on September 17, 2011 at 2:50 PM Comments comments (0)

Today I manage to complete landing gear assembly and a vertical tail.

Tail roughly attached to the fuselage with adhesive tape. Note large aerodynamic compensation of rudder. I will use small servos and want to make them life easier :)


Now starts to look like an aeroplane! The tail wheel is attached to the rudder.

Later, after taking these photos, I sand round leading and trailing edges of the tail, separate fin from rudder, and permanently glue fin to the atr fuselage. No photos...:roll: