RG 15A 8.9% 160mm cord…. that should cut the air nicely no?
http://www.ae.illinois.edu/m-selig/ads/afplots/rg15.gif
thick enough to fit in some 8g servos. If one servos per aileron was not strong enough, could always put a second one.
That should make it a nice slope soarer… UK is the right place for that 🙂
Finding a used fuselage from a high performance glider could minimise the work…
Thanks to Daniel, a couple videos to remember such a good time we had 🙂
Thanks you!!
Really nice landing area 🙂
Was it Denbies Hill?
It feels like we failed in being a team.
It’s sad as 99% of the drawings where done and that was the hardest bit. We just had to order the bits and build it… for that we had to sit down a couple of hours to get it done… some of us seem to have better to do 🙁
Still I really want to thank the people from Colab Systems, and specially Bruno who was very available and helpful. Without his help, the drawings would never have gone so far.
I think I will build the plane for my own pleasure and perhaps one for a friend who wants to make some aerial footage.
Sorry Bruno to have let you down.
Sadly
Antony
PS: si le français est le roi des cons, le british est le roi des enculés. Se faire enculer, ce ne sont que les 3 premiers centimètres qui font mal… après certains y prennent gout!…
So now worked out the fixations of lower and upper wing.
I just spoke to Lucien Cabrol and he advices me to put the tail 1 cord further away. We’ll adopt the FX 62-K-153/20 profile.
Hoping to get to speak with Bruno soon and have a look with him at these drawings.
And what colour do we go for taping the wings?
This way, the tail is just a bit more than 3 cords back from the colab wings
vertical stab: 0,053 m2 (is ~10% of the wing surface enough?)
derive de profondeur (I’m missing the english word for the horizontal part of the tail) : 0,126m2
wing surface: 0,505m
This is my first 3d design ever, but i’m starting to understand how it works.
here the 3d google sketchup file for those who want to play with it colab-1.skp.zip
colab-2
Hi everyone…
Just a quick post to say I’ve managed to block my back, so I’ll avoid sitting in front of the computer for a bit 🙁
Soon, I’ll add up here some information about Wednesday’s meeting at the Mosaic Clubhouse.
Since, I’ve had a long conversation with Bruno and I’ll start drawing some proper plans of the plane as now it sounds like we’ve sorted most of the problems… at least on the paper.
The wings will be cut out of EPP by flyingwings.co.uk
They will be reinforced by a carbon tube and covered by raping tape, this will eliminate having to struggle with smelly glues…
more coming soon.
I had a long conversation with Bruno who is a model plane builder with long experience with this concept of wings. (Sounds like he’s been involved in building Lucien’s prototypes from when Lucien invented the concept)
At first we discussed about the air-foil profile of the wings. His opinion was the RG-15 profile was just for performances. It would fly fast, but he prefers using a FX-62k profile that has been design for better handling flaps.
Perhaps we should build the prototype using the RG-15 and see how it goes, knowing Bruno has the experience of the FX 62-K-153/20, we could always fall back to this if ever RG-15 was giving us issues and that we needed more brake power.
He then explained me the proportions to respect. They are very simple: the back wing has to be 2 cords further back and 2 cords further down. The tail of the plain being 3 cords away.
Side view (corrections / suggestions by Bruno)
Something he mentioned is to use balsa leading and trailing edges that we can by from a local model shop. It helps making strong solid wings saving us using fibre glass or carbon rods.
He prefers to use tricycle landing gear.
He send me two documents.
One is just pictures of an existing model converted to the COLAB System
WAYFERER COLAB (pdf)
The second document in French who describes more in detail the COLAB.
Starting on the bases of a total of 3m of wings with a cord of 16cm, that gives us a surface of 300cm x 16cm = 4 800cm²
If we aim for a plane of about 1kg and that we add 4l, that gives us around 5000g/48dm² ≈ 104g/dm² (commonly acceptable values for the wing load can go up to 150g/dm²)
