Avalon 3.7 Electric

Avalon 3.7 Electric

One of the Avalons has some very slight damage. Please email or phone for info.

The Vladimir's Models Avalon 3.7 is a version of the world renowned electric Super AVA Pro-e with flaps and ailerons. It is called Super AVA Pro-e 4 Flap by other dealers, but we like the idea of a name to evoke legends!

The Super AVA Pro is a wonderful model with brilliant soaring capabilities, but many modellers have asked for a version with flaps and ailerons, to improve manoeuvrability and allow more accurate landings. The Avalon 3.7 with its large flaps and ailerons fulfils these requirements in several ways:- easier entry into and exit from thermal turns; the airfoil’s camber can be optimised in flight; walking speed accurate landings with 85 degrees of flap and the ailerons set for crow braking.

Highlights of the Avalon 3.7:

• The large 3.7m span results in a very low sink rate, and has a large visual footprint, allowing the model to be flown further away than smaller soarers.
• The fully articulated wing allows the model to outclimb others in weak lift, and also to penetrate back upwind after following a thermal to the limits of vision.
• The Avalon wing planform has been optimised to be nearly elliptical, and the construction of the tip panels utilises a carbon D-box for stiffness and strength. Good adherence to the airfoil profile also gives a useful drag reduction.
• The massive flap is bottom hinged, allowing the model to be slowed to walking pace and making accurate landings child's play.
• The Avalon's high aspect ratio tailplane has a carbon D-box construction, increasing strength and reducing trim drag.
• The fin has a molded fixed portion, with a low drag central tailboom attachment that allows the fin to be removed making the Avalon more transportable.
• The electric fuselage has a beautifully executed canopy hatch allowing the battery to be inserted and connected easily, improving safety and usability on the field.
• The pod also has a carefully engineered wing pylon to reduce interference drag. It is also very long allowing a smallish motor to be used to achieve the correct CG, and large propellers, for an efficient powertrain. Its rigid structure allows kilowatt sized motors to be installed for ultra fast climbs, if required.

Vladimir has taken the build to a new level of completeness, so the Avalon can be assembled in only a few hours. Work done in the factory to speed final assembly is as follows:-

• The wing control surfaces have been hinged and the servo wires threaded into place.
• All pushrods and horns have been fabricated, wires bent, etc.
• Fitting the servos in the fin has been simplified.
• The only work required to compete the model is to glue the boom to the pod; attach the V mount and fin, then install the powertrain & RC gear.

The Avalon is a thermal duration eSoaring model suitable for sports fliers and competition fliers alike, the fully articulated wing makes it great fun to fly, with responsive handling and a very wide speed range.

Avalon Specifications
Wing span	3.7 m	147 in
Wing area	82.3 dm2	1276 sq in
Length	185 cm	72.8 in
Flying weight from	1770 g	62.4 oz
Wing loading	21.5 g/dm	7.0 oz/sq ft
Aspect ratio	16.9
Wing airfoil	AG24/25/26
EDA (dihedral)	7.5º
Spinner Diameter	38 mm
Centre of Gravity	100-108 mm from wing leading edge
Controls	Rudder, elevator, ailerons, flaps

Avalon Typical Weights
Fuselage	209 g	7.4 oz
Wings	832 g	29.3 oz
Fin	39 g	1.4 oz
Tailplane	27 g	1.0 oz
Accessories	50 g	1.8 oz
Total structure	1157 g	40.8 oz
Wiring & glue	20 g	0.7 oz
Tail ext leads	20 g	0.7 oz
Receiver	12 g	0.4 oz
Tail servos	20 g	0.7 oz
Wing servos	64 g	2.3 oz
Regulator	52 g	1.8 oz
Motor	230 g	8.1 oz
Prop & spinner	35 g	1.2 oz
Battery	160 g	5.6 oz
Flying weight	1770 g	62.4 oz

The above equipment should balance the Avalon in the middle of the CG range. A ligher powertrain or battery will require lighter tail extension leads, or moving one or both the tail servo forward into the pod.

Recommended Servos
Elevator & rudder	MKS DS6100, Hyperion DS09-AMD, MKS DS65K
Flap	Hyperion DS095-FMD, DS13-TMB, MKS DS6125 Mini, KST DS125
Aileron	MKS DS6100, KST DS115, Hyperion DS09-AMD, MKS DS65K

Avalon Control Movements
Rudder	57 mm each way
Flap	85 degrees down
Ailerons	35 mm up, 20 mm down
Elevator	21 mm up, 23 mm down
Elevator neutral	42 mm from the trailing edge to the top of the boom
Flap elevator mix	With full flap elevator 11.5 mm down. With 60% of the movement the first 30% of flap travel
CG for above	101 mm from LE

Recommended Powertrains
Kontronik Kira 500-30 with 5.2:1 box, 18x12 RFM prop, 3S 2.2Ah LiPo, 80A ESC
Kontronik Kira 500-30 with 6.7:1 box, 18x10 prop, 4S 3Ah LiPo (62A, 3300 fpm)
Hacker B50 9S with 6.7:1 box, 17x10 prop, 3S 2.5Ah LiPo (84A, 2900 fpm)
Hacker B50 9S with 6.7:1 box, 16x10 prop, 3S 2.5Ah LiPo (69A, 2400 fpm)
Kontronik Kira 500-36 with 6.7:1 box, 17x11 prop, 3S 2Ah LiPo (63A, 2400 fpm)
Kontronik Kira 500-36 with 6.7:1 box, 16x13 prop, 3S 2Ah LiPo (59A, 2050 fpm)
Kontronik Kira 500-36 with 6.7:1 box, 16x10 prop, 3S 2Ah LiPo (47A, 1900 fpm)
Hyperion Gs3032-08 direct drive, 16x10 prop, 3S 2.5Ah LiPo (74A, 2400 fpm)
Hyperion Gs3032-08 direct drive, 16x8 prop, 3S 2Ah LiPo (63A, 2200 fpm)
Hyperion Gs3025-10 direct drive, 16x10 prop, 3S 3Ah LiPo (72A, 2370 fpm)*
Hyperion Gs3025-10 direct drive, 15x10 prop, 3S 3Ah LiPo (60A, 2000 fpm)*
Hyperion Gs3025-10 direct drive, 15x8 prop, 3S 3Ah LiPo (51A, 1880 fpm)*
*The Gs3025 motor leads may have to be routed externally for a short distance.

Our thanks to Martin Bell and Andy Clark for the Avalon/Super AVA Pro 4 Flap photos and setup info.

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