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Oct 18, 2012, 04:58 PM
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indoor_fr's Avatar

Nacelles


Ok, the nacelles have been made with the EDF inside. I've cut them because they were too narrow at the end, and that would have affected the thrust, i think.
The carbon rods were cut because i thought that the AR6400 would be located on the EPP support. In fact, i'll have to put it far frontward, in order to balance the plane.I will make a support for the Brick (that will cross the whole fuselage).
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Oct 26, 2012, 04:52 PM
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indoor_fr's Avatar
A little more progress. I have glued inside the fuselage 2 pieces of 2mm depron, and cut the fuselage at the size of the ribs.
The ribs(1) that you see will be attached to the fuselage with magnets.

I must make 2 others ribs (2) that i will glue to the wings.
I will then join the ribs(1) and (2) with the good angle for the dihedral.

Once the ribs (1) and (2) constitute a single rib, i have removable wings....
Oct 31, 2012, 01:20 PM
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indoor_fr's Avatar
Ok, i've used some 2mm depron to make this piece that supports the AR6400 brick.
I'll use small magnets for holding it his front part.
I'm working on the wings.

More news soon.
Nov 01, 2012, 09:22 AM
Registered User
indoor_fr's Avatar

wings


I've made one wing and i'm finishing the other. Do i have to insert carbon rods through the ribs to prevent twisting?
Nov 01, 2012, 01:19 PM
Aircraft Designer Guy
AJWoods's Avatar
Really amazing!
Latest blog entry: Giant Scale Lego Plane
Nov 01, 2012, 05:16 PM
Registered User
Chrizz's Avatar
Hi indoor_fr!!

What a wonderful build you are making! Can't wait to see the finished result, hopefully also in a in-flight-video!?

Happy landings

Chris :-)
Nov 01, 2012, 05:34 PM
Registered User
indoor_fr's Avatar
Thanks a lot Mit Kid and Chris for your kind words.. It encourages me to speed up this construction!

My main fear is the final AUW....With such low- efficiency edf units, it is a challenge.

Stay tuned.
Nov 02, 2012, 05:09 PM
Registered User
indoor_fr's Avatar
I have damaged my left wing with an accelerator for glue that has dissolved the foam.Grrr!!!!

I have to make it again!
This is an opportunity to show the process with Water slide decals.
Last edited by indoor_fr; Nov 02, 2012 at 05:28 PM.
Nov 02, 2012, 07:06 PM
Micro Boat Forum Founder
boredom.is.me's Avatar
Nice. Where do you get the decal paper from?
Nov 03, 2012, 07:49 AM
Registered User
indoor_fr's Avatar
Quote:
Originally Posted by boredom.is.me
Nice. Where do you get the decal paper from?
Thanks. I buy them to Crafty computer in UK:

http://www.craftycomputerpaper.co.uk...-Paper_151.htm
Nov 03, 2012, 07:52 AM
Registered User
indoor_fr's Avatar
Quote:
Originally Posted by Chrizz
Hi indoor_fr!!

Can't wait to see the finished result, hopefully also in a in-flight-video!?

Chris :-)
Yes, for sure...if it flies!!!

Bye.
Nov 17, 2012, 12:01 PM
Registered User
indoor_fr's Avatar
Sorry, but i was too busy to work on this project. So, not much progress.
As always, the more the build gets to its conclusion, the more it takes time... like the charge of a capacitor...
Ok, i've worked on the nose. It will hold the support of the AR6400. I'll use 2 magnets to hold it to the fuselage.

I'm still working on the way to attach the wings to the fuselage. Not really happy so far with my trials.

So, the next steps are:
Install the wings
Make the landing gears
Find the battery location to balance the plane
Make a hatch for the batteries.
Nov 17, 2012, 08:46 PM
Pilot, Co-pilot, Navagator
nemoskull's Avatar
whats the current weight of the fuse?
Nov 18, 2012, 07:32 AM
Registered User
indoor_fr's Avatar
Quote:
Originally Posted by nemoskull
whats the current weight of the fuse?
Fuse+ nose: 6g

Fuse +nose + tail with the EDF 30+AR6400+ESC+linkages: 30.2g
Dec 25, 2012, 08:47 AM
Registered User
indoor_fr's Avatar

Calculating the optimal balance point


Ok, i have made the wing attachement system. It woks ok, but the dihedral is a little bit too much. We'll see later.
It adds 1,5g but it makes the plane easier to transport.

I've calculated with a program, that the COG is 8 cm after the leading edge of the wing.

In fact, the optimal balance point is backward because of the stabilisator's area and the great lever.

René Jossien proposed a formula that takes in account these parameters + the kind of airfoil, etc...

Read this instructive article:

http://jmquetin.free.fr/1indoor/tips8e.htm

With Rene Jossien's formula, i find a balance point at around 9,1 cm behind the Leading edge.

This result sems to be confirmed by the glide tests.

This would mean that i don't really need to put the AR6400 so much frontward to balance the plane.

I can probably shorten the piece of depron which supports the brick, and still balance the plane with two190 mA.h batteries (10g) installed a little frontward.

More to come...
Last edited by indoor_fr; Aug 04, 2015 at 08:06 AM.


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