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Posted by vincent123 | Yesterday @ 03:52 PM | 1,270 Views
Tried it out on the runway !

EDF seems to have enough power to pull her out of the grassfield. Once started I needed to reduced the throttle to avoid her taking off !


FZ5 PART2: all wood ducted fan flying wing (1 min 7 sec)


Vincent
Posted by vincent123 | Jul 02, 2016 @ 01:40 PM | 2,505 Views
Some lead added to correct the CG to be on the safe site for maiden.
Posted by vincent123 | Jun 27, 2016 @ 12:21 PM | 1,156 Views
R T F !

All done !

You open the box, some glue here and there and RTF !

Some figures for the interested:
Span 1074mm (without fuselage)
Root 340mm
Tip 205mm
LE sweep 31°
AUW 1730gr (including 110gr nose lead)
Wood weight 850gr
Thrust 2100-2300gr
Stall speed 31km/h
Angle of incidence 0,5°
Angle of attack at takeoff 8°
Wing loading 60gr/dm2 (19,5 oz/sq ft)
Cubic wing loading 11 oz/ft3
Twist 0°
Dihedral 0°
Dihedral effect CL=0,8: 14,2°

...Continue Reading
Posted by vincent123 | Jun 19, 2016 @ 12:38 PM | 1,081 Views
I covered the balsa shell, wings and fuselage, with 3 layers of epoxy (without glasfiber cloth).

After every epoxy layer, i wiped it off with a paper cloth (thanks Kent!).

Target was to seal the balsa and give a bit of "hanger rash strength": and it turned out fine: the balsa grains are much more visible, and that was also what I envisionned.

In total this added 30 grams (10 gram per wing).

Nevertheless, some areas showed a glossy look, some looked dull/mat: something difficult to avoid when using epxoy only.

So I decided to give it a slight glossy spray with a transparant varnish. Neglectible weight addition.

The oracover process it still ongoing, the bottom of the wings and one winglet needs to be done still!
Posted by vincent123 | Jun 12, 2016 @ 05:26 AM | 1,340 Views
Applied an epoxy layer and wiped it off with a paper towel, no glass cloth applied, looks great, the wood grain pops now!
Posted by vincent123 | Jun 06, 2016 @ 01:35 PM | 1,211 Views
View on the winglet, which acts also as a landing skid.
Posted by vincent123 | May 16, 2016 @ 02:45 PM | 1,676 Views
Meanwhile been working on the control surfaces, cut out and control horns glued in.
Next item are the winglets and some kind of color sheme.
Posted by vincent123 | May 07, 2016 @ 04:08 AM | 2,182 Views
Took a while but the gear door works fine now !

Vincent

Retractable steering wheel with gear door (0 min 25 sec)

Posted by vincent123 | Apr 24, 2016 @ 01:33 PM | 1,942 Views
Ok, gear hatch cut out.
Now figuring out how to operate that door !
Posted by vincent123 | Apr 24, 2016 @ 10:51 AM | 1,452 Views
Realised today that I took a wrong point of rotation for the fron wheel.
The wheel arch touches the battery hatch.

Seems that I need to cut afar larger door for the retract wheel!

Forgot about the difficulty level
Posted by vincent123 | Apr 05, 2016 @ 07:48 AM | 2,214 Views
LE being glued
Posted by vincent123 | Apr 02, 2016 @ 08:29 AM | 1,845 Views
My guide
Posted by vincent123 | Mar 27, 2016 @ 02:24 AM | 2,249 Views
Busy making the same of the other.
Posted by vincent123 | Mar 06, 2016 @ 04:37 AM | 2,050 Views
Flap and Aileron cut out.
Posted by vincent123 | Feb 28, 2016 @ 02:29 AM | 2,686 Views
First wing fully sheeted.
Fit wing fuselage went fine.


Flap and Aileron still to be cut,

And then...the next wing, underestimated all the work!
Posted by vincent123 | Feb 21, 2016 @ 10:49 AM | 2,359 Views
Made a frame in order to sheet and glue without distorsions.
I first used this technique for the FZ2 sheeting.

Also made the ailerons a bit stonger.
Posted by vincent123 | Feb 09, 2016 @ 03:54 AM | 2,611 Views
It s gonna be a huge wing surface...