Krick 1/4 scale Grunau Baby IIb
Part 2 - Tail surfaces and fuselage r/c gear installation
The tail surfaces are a very simple affair, however, there is lots of sanding to do !
Horizontal stab, elevator and rudder all are built flat on the building board, out of balsa stock, and the sanded to shape.
Rudder rudder installed, with pull-pull setup rudder installed and covered
The kit comes with a pull-pull setup for the rudder, however, the wires are way too thick and heavy, so I replaced it with a pull-pull setup from Dubro:
What I don't like about pull-pull wire setups , is that the wire tension always is on the servo bearings, so in order to avoid this, I made this bellcrank setup , where the load from the wire tension is taken by the post:
horizontal stab and elevator, before and after covering When it came to hinging both the rudder and elevator, I decided not to use the
plastic hinges included in the kit. Instead, I hinged the elevator and rudder with
knuckle hinges, these I made out of parts left over from my Ka8 kit
With the elevator connection I also deviated from the building instructions, they incorporate a regular
bowden type push-pull setup, connected to the elevator by means of a control horn an clevis. I could see
that making this connection during assembly at the field would be quite a hassle, so I modified it this way :
The pushrod is connected to a cam, installed in the fuselage below the elevator . On the elevator I installed
this piece, bent from 3/32 wire . It engages in the slot in the cam, and makes for an easily
connected/disconnected elevator drive, and is fairly slop-free.
servo tray servos installed servos hooked up rcvr & antenna guidetube