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Old Dec 15, 2012, 10:56 AM
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Ljubljana Brnik, Slovenia
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Mini-Review
MARABU 3kg@2,65m

I will introduce to you here my design of very lightweight yet large electric plane I design and build last year.

You can download a FREE SAMPLE PLAN (click here) and if you became interested for making this model for yourself or friend, you can buy plans here (click).

Its outer layout is slightly taken from a small Czech build rubber powered free flight model with the same name.

Actually I started a building thread in Parkfly section, as this model is rather ligtweight, has very low wing loading and its minimum speed is somwhere between 17-19 km/h (10-12mph)
As I recieved some critics that this Giant Slow model doesnt belong in the "parkflyer" section, I deleted the building thread there.

Well, now model is flying already more than one year with a great succsess, I decided to share it with you here!

Some specifications:

Wing span: 2,65m (104")
Weight: 3000g (6,6lb)

Some photos of model in action:
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Last edited by ultralajt; Dec 30, 2012 at 03:09 PM.
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Old Dec 15, 2012, 11:09 AM
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Ljubljana Brnik, Slovenia
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Some more photos from my flying sessions:
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Old Dec 15, 2012, 12:26 PM
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Ljubljana Brnik, Slovenia
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And some videos:

Testing before maiden:
Tossing MARABU in the air (0 min 13 sec)



Maiden flight:
Marabu maiden flight (4 min 22 sec)



Aerotowing:
First aerotow in history of Radeče (1 min 48 sec)


Flying in high wind:
MARABU STOL in Wind (1 min 43 sec)
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Old Dec 15, 2012, 12:33 PM
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Ljubljana Brnik, Slovenia
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There are plans made by me for the Marabu.

Plans consists from 7 sheets of A0 paper format:

Both wings, 1:1 scale:


Fuselage and tail, 1:1 scale:


You can download a FREE SAMPLE PLAN (click here) and if you became interested for making this model for yourself or friend, you can buy plans here (click).


Regards!

Mitja
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Old Dec 15, 2012, 02:10 PM
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United States, CA, Ridgecrest
Joined Dec 2011
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Really nice slow flyer! I so enjoy RC planes that fly in a scale like manner instead of zooming around at a scale speed five times the Vne of the full size plane.

What is the wing loading? Somewhere around 30 gm/dm2? That's impressively low for such a large plane.
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Old Dec 16, 2012, 04:51 AM
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Ljubljana Brnik, Slovenia
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Quote:
Originally Posted by TP715 View Post
Really nice slow flyer! I so enjoy RC planes that fly in a scale like manner instead of zooming around at a scale speed five times the Vne of the full size plane.

What is the wing loading? Somewhere around 30 gm/dm2? That's impressively low for such a large plane.
WOW! You are pretty close! Wing area is 94,52dm2, which resulted at 3000g flying weight excatly 31 g/dm2.

Regardless of Marabu low weight, it is pretty tuff. I had an unattempted encounter with a tree and model was repaired in a day.
Low wing loading allow me to even catch a thermall ocasionally and gain altitude power off.
Large control surfaces makes this model very easy to fly. It doesnt posess any of bad habbits, it react well to the control inputs and is very predictable in flight.
As it is very large, fly very smooth and it is a great platform for taking aerial photos or videos:

GoPro2 Video:
MarabuGoPro01 (2 min 32 sec)


My village in winter:
Šentjanž HD (2 min 53 sec)


Thermalling:
http://www.youtube.com/watch?v=5dTjP3B1P8I

I think if I use some sort of gyro stabilization in future (plane or just camera gimbal) the videos will be great!

Mitja
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Last edited by ultralajt; Jul 20, 2013 at 02:53 PM.
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Old Dec 16, 2012, 10:16 AM
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United States, GA, Peachtree City
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Such a great model! Are the wing struts functional?
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Old Dec 16, 2012, 11:14 AM
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Ljubljana Brnik, Slovenia
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Quote:
Originally Posted by Scott C View Post
Such a great model! Are the wing struts functional?
Yes, wing struts are functional. Thats why the wing could be made so light. Also There are no massive wing joiner tubes at the root, but only two short carbon tubes at the fuselage/wing joint.
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Old Dec 16, 2012, 03:34 PM
JustFlying
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What motor, battery and prop are you using?
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Old Dec 17, 2012, 12:06 AM
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Ljubljana Brnik, Slovenia
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Quote:
Originally Posted by rebell View Post
What motor, battery and prop are you using?
Motor: TURNIGY AERODRIVE XP C 3548-800

Battery: RHINO 20C 4S1P 3700mAh

Prop: APC E 13/6.5"

This setup allow very short take of, steep climbing and about 20 minutes of normal flying (some loops, climbs and power off "gliding") with reserve for some repeated landings.

As I saw that aerotowing was almost scale, regarding climbing slope, it is better to pull glider up with more power, so I intend to install another motor, which will give vertical climb performance (3D performance), but I know this power should be handle with care...full power on climbing or towing only.

The motor will be: TURNIGY 4258-800
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Last edited by ultralajt; Dec 17, 2012 at 02:38 PM.
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Old Dec 17, 2012, 08:46 AM
JustFlying
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Interesting. I never saw a APC 16x3, where did you get it?
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Old Dec 17, 2012, 02:38 PM
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Ljubljana Brnik, Slovenia
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Quote:
Originally Posted by rebell View Post
Interesting. I never saw a APC 16x3, where did you get it?
OOPS, my typing mismatch! Thanks for noticing!

Propeler is APC Electro 13/6,5"

(Corrected now in post above)

The propelers I purchased for the TURNIGY 4258-800 are APC E 14/7" and 13/8".
Will see which will be better.

Regards!

Mitja
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Old Dec 29, 2012, 01:54 PM
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Ljubljana Brnik, Slovenia
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Video from today`s flying:
Last flight in 2012? (4 min 6 sec)
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