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!…
And what colour do we go for taping the wings?
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)
The BMFA got us in contact with Roger Godly, member of the Croydon Model Flying Club, who is willing to give us a hand in building the model.
His experience will be of a precious help in our project.
We need to set a day (preferably WE) and a place we could meet him and discuss how he can help us.
I had just spotted the BMFA Challenge when Stefano mentioned he would be interested in developing an activity around rc model planes at the Mosaic Clubhouse and that Make Me Smile Again could be a way of financing such a project.
So Stefano and Victor filled in the application form for Make Me Smile Again and on the 9th of February Stefano got a confirmation that they had agreed to support the project with £746 🙂
In the mean time, I got a chance to talk with Lucien Cabrol, the inventor of the COLAB Concept (French). He thought this concept was well adapted for such a project and gave me some useful guidance. The concept uses wings that join at their tips, having two major benefits: increased strength by triangulation and being far more efficient than a wing of same width.
More efficient in that it can get better lift, can fly slower and can fly faster that a traditional wing and still remaining more stable, and the best of all, such a wing is still simple to build using the same techniques as for a standard straight wing.
