Erstflug gemacht !
(sorry for using englisch ....)
The facts :
-Nordstern in electro version
-total weight : 2550g (batt. incl.)
-motor : Kontronik FUN500/27, gear 5,2
-batt. : 4S/2800mAh (265g)
-servo's : KST, 2x145MG for stab. , 4x135 for wings
-ESC/BEC : 60A, Dymond
-prop : Aeronaut 16x10 (on a 45mm bridge) (on the pictures is a 36mm spinner with 25mm bridge for a GM prop)
-wing loading : 42.5g/dm²
Measured :
-current : 65A => is at the max limit of the drive ; 15x10 or 16x8 will be better, or a GM 16x10 prop on 25mm bridge
-climb rate : 22m/s (according Altis vario) ; (this is real vertical climbing...)
-total height : around 2100m , or 10 times to 200m (battery used for 70%)
-flight speed : min 35km/h , max 170km/h (50°..60° dive)
Flying :
In one word : agile !
Large speed spectrum.
It penetrates very good and goes like on rails. Speed-to-height recovery is moderate (seen the low weight) .
Reaction on controls is very direct ; height needs some expo; for ailerons, I mix 50% flaps in normal flight ; in thermal the mix is off.
The settings as proposed by Kustenflieger are very good.
My flaps go 65° down for braking ; with that it it comes down very smooth (50% down mixed) => watch out : retract the flaps before touching
the ground as the flaps are larger as the height of the fuselage.
I was most curious on how it would behave in thermals as I mostly fly in flat land. And to my surprise it performs very well ; yesterday I recorded
climb rates up to 1,5m/s ; I was in the air with an Explorer and an Experience => they climb a bit faster but I stayed up in the air just as long
as they did and can travel from one thermal to the next much faster. Circling in thermals can be done very compact as well as with large flat rotations ; here the low weight comes in well. Setting the flaps and ailerons 3mm has a clear effect .
About CG : mine is now at 90mm, as said by Kustenflieger . Seems right , but I need to experiment more with that.
About building :
No difficulties ; only the bord of attack needs some attention ; it comes too "sharp" ; I made mine a bit more round.
Pay attention to the wing sheeting where the servo's go ; the sheeting is not strong/stiff. I used 3D-printed servo frames which are glued
onto a double layer of 100g glass AND (most important!) to the main spar .
I treated the wings with wood cire (holzpolitur) ; twice .
On the bottom side , I painted yellow "block streifen" but I must admit that in the air it has little effect ; the contrast between the yellow and the wood is not that much.
With my setup, I did not need any additonal lead to get the CG right ; I set the CG with the battery position.
To fix the V-tail panels, I use a small screw that goes into the carbon tubes (I glued a plastic tube in the carbon tube to be able to put a small screw in ; see pictures). For the wings , I use Multiplex multilock.
For the antenna's , I glued in 2 plastic tubes in the bottom of the fuse , to guide the antenna's and to keep them in place (at 90° relative to eachother) ; like this they are below the carbon reinforcements on the sides of the fuse.
My first conclusion :
-good quality of the kit
-good flying ; all round with preference towards "up tempo flying" without loosing too much of thermal soaring capacities.
-and most of all : very good on balance cost/quality ; I don't know any other 3m machine in this price category with these capabilies and quality .
-possible improvement : use the steel bar to add some weight ; it can surely handle it .
Next : try it on the slope ; that's were it's real destination seems to be ...
. Und älteren F3B Modellen ist er von der Leistung ebenbürtig bis besser in allen Belangen. Das ist aber meine subjektive Meinung. Mal eine Saison fliegen dann kann man ein richtiges Fazit ziehen. 
