Phase 6 - Set-up and Finishing off
1. The torsion wire needs to be installed in the stab/elevator to allow it to pull-spring. This is an unusual spring in that it comes as an L shape rather than a U shape - it took me some time to work it out! Basically if you grab one of the bottom wires in the L and twist it about the 'I' long axis of the L you'll get a upside down T shape that if you let go will snap back into an L - hey presto torsion spring! All very clever as the U shape that you twist into a Z torsion spring gives you a off-centre twisting load on the elevator. This L shaped spring is a very nice solution to this.
2. Now you need to add the elevator control horns by cutting it out of the supplied CF sheet which is beautifully thin and light. Cut the elevator horn as shown in the photos - this will allow you to hook on and then slip off the elevator pull wire so you can disassemble the FireFly's stab when you need to. Next cut and install the aileron horns in the same manner, but don't put a lightening hole in them!
3. Now install you gear in the nose as far forward as possible. This will depend on you gear, but the photo shows my layout with 3 x SD100 servos, a 360mAh Lipo and a Frsky 4ch Rx. You're looking for a balance C of G at 60mm to 65mm from the leading edge of the wing.
4. Now it's time to drill the very small hole in front of the stab for the elevator pull wire. position it as shown and lengthen it out to allow it to move easily. Don't over lengthen the hole as this will weaken the boom - use the position of the elevator servo to give you an idea.
5. Now it's time to make up the push rods and fit them. Do only the servo end of the rod first with a Z bent wire and heat shrink with cyno dripped in to set it in place. Once you have them made up with one end fitted, position them carefully using your servos as a guide and then mark the places where the holes will be drilled in the pod (see photo). Once you've treble checked everything drill the holes and lengthen them out with a small tile saw blade to allow them to slide freely at the correct angle.
6. Now fit the rods to the servos. Next measure up using the wing & aileron horns and fit the other end of the push rod, same technique, but this time use the spring clip connection shown in the photo to allow for disassembly.
7. Now you need to dial in the settings and mixes. I'm using my 9Z WC2 with this DLG. Basically I wanted 3 conditions - launch, cruise and float with the option to trim or drop flaps more in each condition for the maiden flight using the side slider. Once I'd trimmed each condition well through trial and error, I'd set these into the base mix and drop the slider control from the launch condition (still keeping it in cruise and float so I could trim flaps in cruise to actual flight day conditions and drop the flaps right down for landing in float). I did not use airleron differential (I'm not a fan unless maidening proves it's necessary) and set the airlerons for maximum available equal throw either way with a 60% dual rate that I could activate. The initial settings for elevator were completely flat in launch and 1mm down in cruise and float (for later trimming at maiden). Throws for flaps (measured at TE) were set as below):
Cruise 4MM down
Float 6mm down
That's it, if you want to paint it you can (I did and it made no difference to the weight). I'll add the set up details after I've test flown the FireFly.
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