Wyvern

    I have always had a love of sub 3m models.  After the success of the Saker I was keen to use some of the design innovations and improvements to produce a new high performance model.

  The Wyvern’s planform follows my design philosophy that an easy to fly model is one that you can fly with confidence- fast and accurately.  It's reduced size has lead the Wyvern to be a fantastic model for flying every day, where it's performance opens up more fun.

  The Wyvern’s wing is a composite of a number of different sections.  The wing section has been designed to provide optimal speed performance in both neutral trim and also with 1.5mm of camber.  With the camber, the section increases it's buoyancy without the usual drag penalty.  This new section has proved itself ideally suited for high speed turns giving you more options as to the turn style.

  Under neutral camber the low drag section delivers highly efficient high speed performance. Combined with the unique fuselage shaping and tail profile the Wyvern goes in high speed rails

    An indication of just how thin the new wing section is comes when fitting the servos.  Although 10mm servos are ideal to drive the flaps, 9.5 and 8.5mm servos make for a far better option  for the ailerons the CHAservo HV85 and 95s have proved ideal for this.

  The accuracy and consistency of the wings starts with high quality solid aluminium molds.

  Along with the model’s forgiving planform, the Wyvern’s fuselage has delivered strength and ease of use along with aerodynamic efficiency.  The performance that the ‘air scoops’ have delivered in the Saker model continue to deliver in the Wyvern, guiding and shaping the air.  

Settings

 I am always cautious about set up recommendations.  I have flown the Wyvern with a CG 10mm away from the current figure.  

  The CG I have been using is 91mm 

 Aileron up 12mm down 7mm (at root) Flaps up 2mm down 1.5mm (I have been steadily reducing the flap mix recetly)

                Flaps for breaks, over 45deg down slows her nicely

                Snap flap, I have 2 setting I am playing with, either 1 or 2mm across the wing, both coming in during the second half of the elevator stick.

                Elevator up/down 4/5mm measured at the root. 15% rudder mix is a help

Ballast

  The Wyvern has proved itself more than happy from 2.3-4.3kg. The weight has a large effect of the turn styles available

  As a base I used 5 slugs (each 60mm long) this gives me around 800g in the ballast tube.  I have also used brass rods in the joiner.  As a start point, once the slope is working I add a slug for every additional 5mph but this does vary.