|AVA Pro-ef Specification|
|Wing span||3.175m||125 in|
|Wing area||67.9dm2||1052 sq in|
|Typical flying weight||1440g||51 oz|
|Wing loading||21.2g/dm2||7.0 oz/sq ft|
|Centre of Gravity||100-108mm from wing leading edge|
|Controls||Elevator, rudder, flap|
|AVA Pro-ef Typical Weights|
|Hoz tail||25g||0.9 oz|
|Vert tail||39g||1.4 oz|
|Total structure||905g||31.9 oz|
|Elevator & rudder*||Corona DS843MG, Hyperion DS09-AMD, MKS DS6100, KST X08|
|Flap||Corona DS843MG, Hyperion DS09-AMD, MKS DS6100, KST DS113MG, KST DS135, MKS DS6125 Mini|
Review by: John J HudakMy Dream Machine
I live in the US and had to purchase my AVA Pro-E Flapped 3.2m there. This was my first major assembly. Iím an intermediate recreational pilot with about 5 yrs. experience. I prefer very slow flying and circling in thermals and have never done aerobatics intentionally. I chose this AVA based on my calculated sink rate estimates (see files attached to https://www.rcgroups.com/forums/showthread.php?3094152-AVA-Pro-E-3-2m-with-Flaps-Build-Log). I did not want a 4m plane and preferred to forego ailerons and just go with the ease of flying with just elevator, rudder and flaps. I did not want a winch launched plane even though some are cheaper, lighter and offer better performance. Iíve been flying this dream machine for 6.5 months. If you can handle the cost and assembly issues, and thatís the reason I provided the build log cited above, you will be very happy with its performance.
Main Components: Neu 1107/1.5Y, P29 gearbox; DS 6100 servos, 3 ea.; Jeti Advance 40 Pro SB Brushless ESC, Spektrum AR 6270 T 6 ch Carbon Fuse Telemetry RX, Turnigy 1300MAH 3S 30C LIPO, Spinner 38 mm, hub 6 mm, 0-degree twist; Aeronaut Fold 15x8 Prop
My All Up Weight: 1343 gms = 47.37 oz = 2.77 lbs
Wing Loading = 6.5 oz/ft2 = 20.4 g/dm2, Span Loading = 133 g/m2
Measured Static Thrust: about 3.4 lb @ 75%, about 3.8 @ 100%
Wing Span: 3.175m = 125 inches, Wing Area: 67.9dm2 = 1052 sq. inches, Length: 1.7m = 67 inches
1. Very tame in flight, exceptionally stable. I often take my hands off the sticks and just watch it fly itself. Turns very easy with slight touch of the sticks.
2. Resists stalling. I suspect the wings provide high lift at low speed which prevents stalling.
3. Seems to float exceptionally well compared with my Radian Pro, Elf and Easy Star. Ten minutes of flight time before 2nd motor run is routinely obtained.
4. Flaps allow Speed, Cruise and Thermal flight modes.
5. Full flaps can bring landing speed to near zero. Landings are very easy to perform with no danger of stalling.
6. Easily climbs vertically at 75% engine power at launch. I normally launch at an angle of about 45-60 degrees. However, use of a lighter motor might require nose weight to properly balance the plane.
7. Proper CG location was achieved without the need for any additional weight, however, Hyperflight light weight wire (3.7 gm/m) was used for all servos and all pod electronics had to be mounted fully forward.
8. Batteries allowed 1 hr bench test with thirteen 30 sec. motor runs and continuously moving servos with no sign of sagging power.
9. Have used both Turnigy 30C and Zippy 25C 1300 mAH batteries with equally good performance.
10. Wingtips attach with electrical tape and are very easy to attach & remove.
11. With mid-wing, elevator and rudder attached, it easily fits in the back of a CRV or RAV4 with back seats down.
1. Took a lot of research and many eCalc (www.ecalc.ch/index.htm) calculations to identify an appropriate motor/prop/esc/battery combination.
2. The countersunk shoulder needed to recess the head of the wing trailing edge mounting screw below the surface of the wing had not been cut and I had to do it by hand.
3. Servos must be located to nearly +/- 0.5 mm to avoid interference with plastic covers provided.
4. The Neu 1107 motor required the addition of 1/8Ē thick plywood epoxied to the front exterior of the motor mount bulkhead and a cone drill was required to cut the 18 mm hole needed for the gear box.
5. Iím handy with tools but this being my first time assembling a high performance sailplane I thought it was tricky and required many more special tools (4-40 tap, 3/8Ē drill, cone drill, micrometer, Vanessa CG Rig, grinding wheels, bubble level) than I expected. See my RCGroups Build Log cited above.