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Posted by vincent123 | Sep 25, 2016 @ 02:48 PM | 4,294 Views
Wing bones worked out a bit,
2 main spars (white) of 3mm carbon should do the job !
Posted by vincent123 | Sep 18, 2016 @ 04:08 AM | 1,310 Views
Got a bit of work done.

The EDF is indeed a huge hole in the wing structure, hope my concept is strong enough.

I have 2 main carbon spars (white colored), reaching from the root till the wing droops down.
Carbon spar thickness is 3mm, which I will route in my CNC machine.
I calculated the strength of one carbon spar and it would sustain 13G.

The other spars (dark brown) is a 2mm plywood routed outline, also going from root spar till mid of the plane. It's a 2mm width and 7mm height spar, I know it's not so strong (can sustain only 0.8G). But I believe this is ok, as long as the main carbon spars do their job, no ?

The EDF sits in a sadle of the second carbon spar.

As I always do, I will burry the EDF in the wing and plank it to a close.
For maintenance the EDF, I will be able to take out the read EDF outlet part, of course I need to cut the planking. The rear outlet is then loosened with the same bolts which fastens the EDF in the sadle.

By doing this, I have a clean planking and with some little cuts I 'll manage to get the EDF out, some little cosmetic repairs and ... done.
Posted by vincent123 | Sep 11, 2016 @ 09:20 AM | 810 Views
Ok, it' s looking like it'll be another flying wing

Worked on the EDF in the wing today.
Inlet (perpendiular on flight line) is 100% of FSA, outlet 90%.
Wing angle of attack towards EDF is 0.6°C for flying level at 150km/h.

Wingspan, is a bit larger than my first estimate, it's now 1400mm, 300mm wider than the FZ.

Weight about 2900gr, wing loading 24.7 oz/ft2
Sweep 33°.

The wing will be a challenge !It has to accomodate the EDF weighing 200gram each, the wing will be drooped for about half the span, with a hopefully stylish wing skid at the tips ..

So, I know what I'll will be doing the comming months !

Sticky: FZ5: it flies !
Posted by vincent123 | Aug 29, 2016 @ 03:34 PM | 975 Views
It flies, and it flies great !

I cannot say anything more, it was just fantastic !

All design efforts, sleepless nights, maticulous building, trimming equations, winglet sizing worries, CG location troubles and discussions .... it all added up.

The thrill is enormous, that's why we build !

Looking forward to the next project !!


FZ5 PART3: all wood ducted fan flying wing (7 min 15 sec)

Posted by vincent123 | Jul 29, 2016 @ 03:52 PM | 1,796 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)

Posted by vincent123 | Jul 02, 2016 @ 01:40 PM | 2,963 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 | 1,638 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 | 1,547 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 | 1,757 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 | 1,623 Views
View on the winglet, which acts also as a landing skid.
Posted by vincent123 | May 16, 2016 @ 02:45 PM | 2,078 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 | 2,515 Views
Took a while but the gear door works fine now !


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

Posted by vincent123 | Apr 24, 2016 @ 01:33 PM | 2,265 Views
Ok, gear hatch cut out.
Now figuring out how to operate that door !
Posted by vincent123 | Apr 24, 2016 @ 10:51 AM | 1,779 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 | 2,550 Views
LE being glued
Posted by vincent123 | Apr 02, 2016 @ 08:29 AM | 2,176 Views
My guide
Posted by vincent123 | Mar 27, 2016 @ 02:24 AM | 2,582 Views
Busy making the same of the other.
Posted by vincent123 | Mar 06, 2016 @ 04:37 AM | 2,372 Views
Flap and Aileron cut out.