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AUDAX

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Re: AUDAX

Message non lupar Bloodhound » 26 Juin 2015, 17:31

Thank you Claude! I hope it will fly well too.The changes are small, but i liked it better this way.
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Re: AUDAX

Message non lupar Bloodhound » 29 Juin 2015, 19:25

A few more images of the finished stabs:

Image Image Image Image Image Image Image Image Image
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Re: AUDAX

Message non lupar Bloodhound » 19 Juil 2015, 10:59

Wing film covering process:

Image Image Image Image Image Image Image Image Image Image Image Image Image Image Image Image Image Image Image Image Image Image Image Image Image
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Re: AUDAX

Message non lupar Bloodhound » 24 Juil 2015, 16:49

A few more images of the film covered wings:

Image Image Image Image Image Image Image Image Image Image
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Re: AUDAX

Message non lupar Bloodhound » 18 Aoû 2015, 08:48

The fin post was traced and cut from 10mm balsa, with additional doublers to support the pin hinges:
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Fortunately i lasercut 2 rudder spars, so i used the spare one as a guide for drilling the hinge holes. The hinges were attached using high strength epoxy and microballoons, making sure they are 90 degrees to the fin post centerline:
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The rudder will be detachable, so i used a carbon rod going through all hinges to save weight. This was joined with a steel rod bent at 90 degrees at the base of the rudder:
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The fin post was finally glued inside the fuselage.The slow curing epoxy gave me enough time to check the proper alignment and free movement of the rudder:
Image Image

The fin post hinges were reinforced with small plywood triangles:
Image
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Re: AUDAX

Message non lupar Bloodhound » 27 Aoû 2015, 09:06

Rudder film covering:

Image Image Image Image Image Image Image Image Image Image
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Re: AUDAX

Message non lupar Bloodhound » 04 Sep 2015, 21:09

Today's update shows the electric motor installation. The motor is a Himax 6330 Pro, using the front mounting conversion kit from F3A Unlimited:
Image Image

I plan to test the 0 degrees right thrust setup (as used on the Allure), but it will be possible to adjust the thrust line by shimming the motor mount.
I used a glassfiber plate to trace the 82mm spinner diameter on the fuselage. The position of the plate was carefully adjusted until it was perpendicular on the fuselage center line. For now, the nose was actually cut 4mm longer to compensate for any thrust line adjustments.
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Cutting the X mount from 2.5mm carbon plate and the nose ring template from 2.5mm plywood:
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Cutting the final nose ring from 2.5mm carbon and preparing the surface for bonding:
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Assembling the motor mount:
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1mm spacer ring taped to the spinner backplate:
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Tacking the nose ring in place with CA:
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Nose ring final bonding, using high strength epoxy and carbon rovings:
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Rear support structure (2mm glass fiber):
Image Image
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Re: AUDAX

Message non lupar Bloodhound » 14 Sep 2015, 08:31

Installing the hinges and sealing the aileron / elevator hinge lines with transparent oracover film:
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Cutting and installing the control horns:
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Control linkage:
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Pull-pull cable exit holes were drilled, a small segment of bowden tube was attached with epoxy and sanded flush with the fuselage:
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Cooling intake holes were cut under the nose. The side intakes were left for later because their position depends on the motor right thrust angle.
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Adding the air deflector for motor cooling and the ESC support:
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Cutting the vent hole on the bottom of the fuselage and holes for the aileron/ elevator servo leads:
Image Image Image
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Re: AUDAX

Message non lupar epjebossard » 15 Sep 2015, 19:19

Hello,
What covering film do you use?

Arnaud Bossard
http://bossardcreation.blog4ever.com
PROMETHEUS / CITRIN
HACKER C54L
CRS Contradrive
EPS 5000mah en 30C
Futaba T14MZ
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epjebossard
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Localisation: St Macaire en Mauges
Avion: PROMETHEUS/CITRIN
Moteur: Hacker C54L
Hélice: CRS contradrive
Carburant: EPS 5000mah-30C
Emetteur: T14MZ
Récepteur: FASST 2.4GHZ
Servos: Futaba
Catégorie: Internationale
Fréquence: 2.4GHZ
licence: 8803283-AD

Re: AUDAX

Message non lupar Bloodhound » 16 Sep 2015, 07:21

Hello Arnaud,

I used standard Oracover for the wings, stabs and rudder: https://www.oracover.de/index.php/katalog/nlayer/36-1-standard_colours.html
I also tried Oralight but it's almost transparent and decided to use Oracover instead.

Alex
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Re: AUDAX

Message non lupar epjebossard » 16 Sep 2015, 20:49

Hello Alex,
Thank you for this information.

See you soon
Arnaud Bossard
http://bossardcreation.blog4ever.com
PROMETHEUS / CITRIN
HACKER C54L
CRS Contradrive
EPS 5000mah en 30C
Futaba T14MZ
Avatar de l’utilisateur
epjebossard
3ème au Championnat de France 1993 Nat B
 
Messages: 273
Enregistré le: 21 Sep 2005, 15:37
Localisation: St Macaire en Mauges
Avion: PROMETHEUS/CITRIN
Moteur: Hacker C54L
Hélice: CRS contradrive
Carburant: EPS 5000mah-30C
Emetteur: T14MZ
Récepteur: FASST 2.4GHZ
Servos: Futaba
Catégorie: Internationale
Fréquence: 2.4GHZ
licence: 8803283-AD

Re: AUDAX

Message non lupar Bloodhound » 28 Sep 2015, 08:59

I've been working on the rudder pull-pull system. The wires are crossed inside the fuselage so i had to study the geometry of the pull-pull system to make sure there's equal tension in the wires at all rudder deflections. I also had to consider that the wires exit the fuselage through the small bowden tubes (representing 2 fixed points). I determined that a 3mm offset was needed on the servo arm (distance between servo wheel center and wires attaching points). I used 2.5mm carbon plate for the servo arm.

Image

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Re: AUDAX

Message non lupar Bloodhound » 05 Oct 2015, 08:42

The battery tray is the last thing to install on the model because it defines the position of the CG.

But first i had to figure out the mean aerodynamic chord (MAC), its position along the wingspan and CG placement.
The simple geometric method doesn't work for this complex wing shape so i had to brush up on my math skills a little:
Image Image

I started with a cardboard template and cut the final battery tray from a 4mm balsa-carbon sheet. It is supported by 6mm carbon tubes and secured with 4 cable ties.
Image
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Re: AUDAX

Message non lupar Bloodhound » 09 Oct 2015, 19:06

The flying season will be over soon and i didn't want to wait until spring for the test flights, so i started assembling the plane. Some details like the wheelpants will be added later and the fuselage will be painted over the winter.

Final motor and ESC installation:
Image Image

Propeller and spinner install:
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Adding some soft self-adhesive material at the wing and stab root:
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Plywood roundels are used to fill the space between the wing root rib and the fuselage side. This prevents stressing the fuselage side wall and the wing root rib when tightening the wing retaining screws.
Image

Receiver tray and support:
Image Image Image
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Re: AUDAX

Message non lupar Bloodhound » 09 Oct 2015, 19:09

Images of the finished interior:
Image Image Image Image Image Image
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