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Posted by vincent123 | Mar 11, 2017 @ 04:09 AM | 988 Views
Left bottom of tghe wing sheeted, still a lot to look forward to

Sanded the outer hull of the inlet, looks ok.
Posted by vincent123 | Feb 27, 2017 @ 11:45 AM | 863 Views
Finally started planking the outer hull !
Posted by vincent123 | Feb 27, 2017 @ 01:00 AM | 995 Views
Councelling !
Posted by vincent123 | Feb 26, 2017 @ 05:14 AM | 1,242 Views
Took a while, but got two EDF's performing comparable.

A first attempt failed in sucking in a piece of paper falling from my wall
A second attemt failed in sucking in a piece of scrap
So I went installing the test rig in the bathroom: less paper and clutter ..
A third attempt resulted in a vibrating EDF, changed the rotor ..
A fourth attempt resulted in the attached table

Good enough, I hope, although they vibrate at high RPM ...
Posted by vincent123 | Feb 11, 2017 @ 11:55 AM | 1,395 Views
I redid the inlet duct as it turned out to be uneven.
With 2mm planks this time, planks much easier than 1,5mm.

This time with a fomer at the very tip of the inlet, which I will cut loose once the inlet is ready.
Posted by vincent123 | Feb 07, 2017 @ 03:11 PM | 1,361 Views
Inlet duct planked.
Would have been better that I took 2mm balsa, it has more flesh for sanding flush.

Result is OK though, final sanding when outer planking is ready.
Posted by vincent123 | Feb 05, 2017 @ 03:04 AM | 1,362 Views
Preparing to get the EDF duct inlet planked.

Sliced the inlet in pieces, ready to route 1.5mm balsa.
Posted by vincent123 | Jan 29, 2017 @ 12:00 PM | 1,779 Views
Building has started!

Lego is again my best friend to keep things straight and aligned.

I was hoping to have the build ready for the summer, but I believe it ll be very difficult. These are most complex wings I ever build, it takes time to position and align.

The pictures shown are still un not glued state, still preparing.

Next step will be installing the motor in the EDF, after thrust balancing...., and after that glueing!
Posted by vincent123 | Jan 08, 2017 @ 11:46 AM | 1,285 Views
The maiden flight went fine !

Just great !

It flew surprisingly stable, better than the prototype version of the FZ5.

Now the path lies open for the real thing!

FZ6 PART 1: maiden flight prototype (4 min 13 sec)

Posted by vincent123 | Jan 06, 2017 @ 11:13 AM | 1,250 Views
It is done, ready for maiden!

Any tips from your side are welcome to struggle through the maiden!

I glued skids onto the engine pods to protect edf and tube against the landing impact.

Throws are a bit larger than usual to be ready for differential thrust issue.
Posted by vincent123 | Jan 02, 2017 @ 08:29 AM | 1,486 Views
I love it when all fits like a glove!
Posted by vincent123 | Dec 30, 2016 @ 08:14 AM | 1,784 Views
Started building the prototype version.

I did not give the thrust tube much thoughts before, so it took a while to come with a way to make them.

Finally decided to route 23 ri,gs from depron and glue together, looks ok!

I'll glass them when finished.
Posted by vincent123 | Dec 18, 2016 @ 12:16 PM | 1,449 Views
Build tabs on the wing.

Looks best when I build upside down.
Posted by vincent123 | Dec 16, 2016 @ 01:40 PM | 1,649 Views
Looks nice, isn't it ?
Posted by vincent123 | Dec 13, 2016 @ 12:02 PM | 1,375 Views
This is not the maiden, but one of the succesfull dolly takeoffs with a nice landing !

The plane is being held onto the dolly by a servo.
Once speed is ok, i switch the servo and plane takes off.

MIG15 dolly takeoff (5 min 18 sec)

Posted by vincent123 | Nov 26, 2016 @ 02:20 PM | 1,736 Views
Battery bay and gear bay have been cut out.
Notice the weak point in the fuselage !
Posted by vincent123 | Nov 13, 2016 @ 05:51 AM | 1,527 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 @ 08:56 AM | 1,781 Views
Test bench to measure the differential thrust when attached to the same battery and each an ESC.
Posted by vincent123 | Oct 30, 2016 @ 12:36 PM | 1,629 Views
Final design and prototype ready to be build