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Posted by vincent123 | Nov 26, 2016 @ 03:20 PM | 855 Views
Battery bay and gear bay have been cut out.
Notice the weak point in the fuselage !
Posted by vincent123 | Nov 13, 2016 @ 06:51 AM | 669 Views
Ok, got some test results for the PT version:

One EDF does a better job than the other one.
At full throttle, the thrust difference is about 20gr on a total of 1283gr, this is only 1.4%.

A second test I made with 2 batteries wired in parallel in order to feed longer and consistent power, the difference increased till 35gr, or 2.5% of total thrust.

Correction could be done by lowering the strongest EDF with 20% throttle, only to mix out the 35gr difference !
That was surprising !

What I learned:
- the max. thrust difference is "only" 35gr, at max throttle stick, then the vertical stab has also max leverage: I do not expect bad behavior from this, agree ?
- mixing out the difference is possible but requires a pretty big throttle difference of 20%, this is a basis for the mixing configuration on the TX
Posted by vincent123 | Nov 11, 2016 @ 09:56 AM | 921 Views
Test bench to measure the differential thrust when attached to the same battery and each an ESC.
Posted by vincent123 | Oct 30, 2016 @ 01:36 PM | 794 Views
Final design and prototype ready to be build
Posted by vincent123 | Oct 29, 2016 @ 08:09 AM | 846 Views
Hi there, working on the prototype.

EDF is an 50mm version 4 cells, good for 700gr.

Wing wil be made of depron with a few spars.

Do I need a thrust tube ? I believe not, for directional stability I have a vertical stab.

Any violent turbulance to be expected having no tubes ?
Posted by vincent123 | Oct 23, 2016 @ 02:44 PM | 835 Views
Vertical stab anchored in the fuselage.

I'll make the stab first and after sheeting it, plug it into the fuselage.
Then fuselage planking.
Posted by vincent123 | Oct 23, 2016 @ 08:51 AM | 839 Views
Decided to invcrease the vertical stab effect by:
- moving the stab 45mm to the rear
- increasing its surface from 8.4% tot 9.8% of wing surface
Resulting in 30% more vertical stab effect in order to dampen a differential thrust issue.
(not for surviving an edf drop out)

Hope it's not becomming spiral unstable ?!
Posted by vincent123 | Oct 21, 2016 @ 03:59 PM | 1,045 Views
FZ6 (design phase) and FZ5 (flies already) and side by side
which one is best looking ?
Posted by vincent123 | Oct 19, 2016 @ 02:47 PM | 968 Views
Carbon longeron of 1 of 0.5mm thickness to give the fuselage strength.
Posted by vincent123 | Oct 18, 2016 @ 03:51 PM | 1,148 Views
Formers taking shape, slowly ...
Posted by vincent123 | Oct 17, 2016 @ 02:58 PM | 829 Views
Formers taking shape
Posted by vincent123 | Oct 16, 2016 @ 04:57 AM | 914 Views
Wing tip modelled.

Acts as a sled for takeof and landing, it'll be submerged in the grass.


I believe it will act also a bit as winglet, reducing the wing vortices.
Posted by vincent123 | Oct 15, 2016 @ 10:51 AM | 1,194 Views
Ready to start designing the formers and battery plate of the fuselage...
Posted by vincent123 | Oct 12, 2016 @ 02:44 PM | 845 Views
Not easy to model a narrow sweeped vertical stab.

Took the NACA0009

Anchoring in the fuselage is for later.
Posted by vincent123 | Oct 09, 2016 @ 03:44 PM | 998 Views
The vertical stab took some shape now.
Posted by vincent123 | Oct 08, 2016 @ 08:08 AM | 1,140 Views
Shifted the ESC's by moving the ESC's below the battery.
Posted by vincent123 | Sep 25, 2016 @ 03:48 PM | 4,740 Views
Wing bones worked out a bit,
2 main spars (white) of 3mm carbon should do the job !
Posted by vincent123 | Sep 18, 2016 @ 05:08 AM | 1,742 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 @ 10:20 AM | 1,248 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 !

Vincent