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T1000FC Auto Pilot System

Posted by ultralajt on October 15, 2014 at 11:30 AM Comments comments (0)

Recently I purchased an T1000FC Auto Pilot System with GPS and install it into my electric plane Marabu.

The main reason for my interes in that electronic was a GPS "return to home" function. Of course the stabilization included is also a nice feature, specially when flying with a camcorder onboard.

Here is the gadget installation:


Photo above: T1000FC Auto Pilot System installed beside the reciever.


Photo above: GPS module.


And here is a flight test:

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THERMIC 70 by Frank Zaic

Posted by ultralajt on July 22, 2014 at 1:50 PM Comments comments (0)

Last week I saw a beautiful crafted soarer at nearby RC flying field. My friend build a scaled up Thermic sailplane. It is and old FF design made in 1946 by famous Frank Zaic. Of course, model is R/C and covered by Oralight.


I decided to build for myself original version of Thermic 70. Wing span is 70".

Plans werew downloaded from Internet:



I cut many 3x3mm balsa strips, as these are basic structure of the fuselage.


I made two identical fuselage sides (ladder):


Next I glue some fuselage formers to spread sides to proper distance and to get shape:


Next I add some additional longerons:


And in very short time, fuselage is ready for final sanding:


Of course, I need to instal servo, battery and reciever tray, install elevator and rudder pushrods, install fin ribs and make a removable canopy hatch for RC equippment access.


Flying over the fog

Posted by ultralajt on May 29, 2014 at 8:25 AM Comments comments (0)

This morning, there was a layer of ense fog over my village, so I decided to fly over it using some free clear patches in that fog.

Later, when I was looking the on-board captured video, was happy!



And a video:

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Aerotow Novo Mesto 2014

Posted by ultralajt on May 14, 2014 at 12:35 AM Comments comments (0)

Last saturday I took my Guppy GS to aerotow meeting at Novo Mesto.

It was a beautiful day for soaring, but I made only one flight as I was not in the mood somehow...

GALEB B.C.II.

Posted by ultralajt on March 11, 2014 at 10:50 AM Comments comments (0)

GALEB (Gull) Yugoslav vintage Sailplane in 1:2,5 scale


I started a new project of making drawings&plans for a former Yugoslav School glider. It was designed pre ww2, but modified to version II. after the great war.

There are at least two different 3view drawings of Galeb sailplane, but I opted to use (and stik to) a 3 view drawing from a national soaring magazine Narodna Krila (wings of nation), where an complete article was published about that Sailplane in 1948. The article was written by designer itself.

Picture above: 3 view drawing of teh Galeb from 1948.


For designing this scale RC model I purchased two special programs :

- DevFus for designing of fuselages

and

-DevWing, for designing of wings (and tail surfaces also)

As Galeb was strongly influenced by Grunau Baby design, I will make internal structure of this glider (placing ribs and diagonals) similar to Grunau Baby. Galeb is slightly different than Grunau baby:

- it has larger wingspan

- it has lower fuselage

- it has elliptical rudder and rounded elevator tips.


Picture above: making of the fuselage in the DevFus software.

Further refinement of the fuselage:

Picture above: elevator plans.

Picture above: making the wing structure in DevWing software.

Ribs for the Foldable Ultralight Sailplane

Posted by ultralajt on January 18, 2014 at 10:25 AM Comments comments (0)

I made and test wing ribs for the Foldable Ultralight Sailplane.



 




Photo above: Rib test contraption. Note bottles and bucket filled with water as a ballast. Of course I weighted the proper ammount.

I am happy with results, as rib survive ultimate load and permanent deformation after ultimate load was almost next to none.

I made pretty primitive contraption for the test.

I use wooden board and clam it vertical into a vice on the bench.

I install rib to that board using a piece of the hardwood. I use bolts trough holes made at end of the rib tubes.

I hang weight to ribs using strong string and bottles filled with apropriate ammount of water and a plastic bucket also filled with water.

To protect strings against sliding off the proper location I wrapped joints with adhesive tape. I also protect strings against rubbing onto the gussets edges by wrapping gusset edges with a cardboard. It not looks nice, but it served the mission.

At end of the rin I attach an arrow alike aluminum sheet and close to it a ruller, where I measure the deflections under the load.

I made a photos of rib deflection at 0, 1, 4 and 6G Load:


1G test: deflection at end of the rib 0 mm




4G test: deflection at end of the rib 5 mm



6G test: deflection at end of the rib 9 mm



Permanent deformation after 6G load: 1 mm


So much for now. It seems to me, that I will stay with this rib design.




Aerial video using 2 axis gimbal stabilization

Posted by ultralajt on October 8, 2013 at 2:15 AM Comments comments (0)

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2 axis Brushless Gimbal-ver.2

Posted by ultralajt on October 7, 2013 at 2:15 AM Comments comments (0)

I build another gimbal, again from 2 mm thick aircraft grade plywood. I reinforce the corners of elements for greater stiffnes, encase the electronic, battery and install  DVD writer anti vibration inserts.

I already made some test flights yesterday evening, but I was not satisfied with electronic component.. wirinf between sensors and controll board became very stiff on cold air and starts to mess with stabilization.  I need to replace these stiff wires with a softer ASAP!




I made 3 slots for the sensor plate, so I can instantly change the camera attitude. It can aim level to horizont, 25° and 59° bellow the horizont, without use of spare RC transmitter channel.

First test:

http://www.youtube.com/watch?v=0KTBm7NogT0


Fligt test:

http://youtu.be/c_Dmb6kFjQk


 



DIY 2 axis brushless gimbal

Posted by ultralajt on September 26, 2013 at 3:30 AM Comments comments (0)



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Aerotow Meeting Cerkvenjak 2013

Posted by ultralajt on September 26, 2013 at 3:30 AM Comments comments (0)

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Aerotow meeting Celje 2013

Posted by ultralajt on September 26, 2013 at 3:10 AM Comments comments (0)

Vintage R/C Scale Sailplanes meeting celje 2013

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Aerotow Meeting, Krsko 2013

Posted by ultralajt on August 26, 2013 at 1:00 AM Comments comments (0)

As traditionally, each late august we meet at Krsko aerotow.

I made couple of flights with my CIRUS HS-62.  For the first time I mount a camera into the rear cockpit, to make some inside videos. Unfortunately, homemade transparent canopy plastic with many tiny imperfections on the surface, prevented perfect visibility from that angle. Outside world is pretty distorted. Anyway, I will show you here a shot clip from one of my flights, where I do a looping and a roll.

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Video clip..view from instructor`s seat.


Assembly of the model on the field at Krsko.


Close view of the cockpit area..pilot not yet in the front seat.


Connecting of towing rope to the tow hook at the glider nose.


Take off...


On the tow...


Soaring...


Diving towards the landing strip.


High speed low pass..



Sharp wingover at the end of the landing field and turning into final.


Air brakes out ...


Last rotation before a touch down..


Pulling the glider out from the landing fueld, to make space for the next glider to land.


Landing strip is free now, so lets hurry across it for another tow...


I believe, about 30 sailplanes and 5 towplanes were present at our meeting.





SideWinder DLG model

Posted by ultralajt on July 25, 2013 at 6:55 AM Comments comments (0)

Couple of days ago, I finally completed my first Discus Launch Glider (DLG). It is a SideWinder DLG from PolecatAeroWorks wing, with of shelve generic fuselage and balsa tail feathers.


Last evening it was maiden flight:

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and this morning I started to throw model higher and higher:

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A am looking forward to catch some thermal bubbles!

:D:P8)


Soaring with Marabu (and testing HK Alti logger)

Posted by ultralajt on July 20, 2013 at 9:25 AM Comments comments (0)

Hi guys!

 

Today I finally took some time to test HK Alti logger (actually it is Altitude permit logger) in role of ordinary alti logger.

 

And what a day! I manage to use thermals and soar my Marabu so high, that I starts to feel uncomfortable (bad visibility..moisted air) so I drop flaps and sprial nose down to "safer" height. Of course I was trying to thermal on that low height and was going up. As dinner was served on the table, and I was also impatient to see what will show the Alti logger on the computer, I landed.

 

This is the log:


Legend: red line:  power on, yellow line=motor off, green line=temperature

 

Before a peak height, I have 2 thermals with average 1,6 m/s climbing.

 

Not bad for a "box" as Marabu is! :p:)


Ultron 3D aerobatic model 2007-2013

Posted by ultralajt on July 13, 2013 at 1:05 PM Comments comments (0)

I took six years old depron model Ultron 3D, that was crashed 3 or 4 years ago, by choosing wrong model on the transmitter. :roll:

Yesterday I repair it. I reinforce  the wrinkled nose section by balsa doublers, I made new horizontal tail, replace 3 servos, and install the landing gear.

It fly perfectly, even with some weight added by repair job.


And a short video of my beating of the air:

http://www.youtube.com/watch?v=Cu112uZ2SQ0




Livno 2013 - Soaring paradise (part 6)

Posted by ultralajt on June 22, 2013 at 1:15 AM Comments comments (0)

I finished a video that show Livno Airfield both in 1964, when CIRUS HS-62 starts to fly there, and today in 2013, when my scale model fly at the same place:


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Aerotow meeting Novo mesto 2013

Posted by ultralajt on June 18, 2013 at 5:35 AM Comments comments (0)

Last Sunday at Precna airfield, Novo Mesto:

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Livno 2013 - Soaring paradise (part 4)

Posted by ultralajt on June 14, 2013 at 7:55 PM Comments comments (0)

I made some movies from Livno:

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Livno 2013 - Soaring paradise (part 3)

Posted by ultralajt on June 12, 2013 at 3:40 AM Comments comments (0)

Photos taken from on board camera video:









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