Evolution v-tail - Introduction

For the coming season a new version of the Evolution with a V-Tail was developed.The contest model Evolution is made for the F3B model category.

Electro modification for the Evolution model.

Evolution F3B sailplane

Description

The preceding X-Tail version has fulfilled the goal for which it was designed. This is shown mainly by the victory of Andreas Böhlen in the Eurotour Contest in Salzburg and Hans Rossman at the Hohe Wand 2008 and many others placed in the contests. The whole conception of the model was kept. The V-Tail is made of 2 pieces. The standard version is made for the 2.4 GHz system.

Development

The airfoil is from Max Steidle (Wing: M 1580 and M1585, other: M08), who also made airfoils for models such as the Crossfire or Tool. He deserves acknowledgments. The Evolution is the first serial produced model with no control horns on the outside To reach the maximal precision in the prototype production, a 3D mill cutter was used. The programs were made with the help of our webmaster, Michal Michna.

Evolution v-tail - Details

Evolution F3B sailplane
Category: F3B
Conception: Two part wing, two part elevator, v-tail
Wing span: 3140 mm
Length: 1470 mm
Wing area: 59,58 dm2
V-tail angle: ~ 100°
V-tail area: 5,60 dm2
Wing airfoil: M 1580 and M1585
Elevator airfoil: M08
Weight: from 2050g
Ballast: 900g
Maximum servo width: wing center: 12 mm (Futaba S3150 or Airtronics 94761Z) , wing tip: 12 mm (Futaba S3150), fuselage: 12 mm (Graupner 3871)
Construction:
Wing carbon-rohacel-glass or carbon-rohacel-carbon
Spar UMS Carbon
Tailplane glass-balsa-glass
Fuselage carbon-glass

Drawing

F3B Evolution V-tail drawing

Evolution v-tail - Performance analysis

Evolution F3B sailplane

We have calculated the performance of the Evolution V-Tail model using the XFoil program. We hope that this knowledge will allow better settings for your model and will contribute to improving the properties for a new model. We plan to compare the calculated results with the actual parameters of the model using a barometric altimeter and GPS logger as soon as possible. So far, however, the results appear to be remarkably accurate (for example minimum sink rate).

Results were calculated for a model weight from 2200 grams to 3400 grams with 400 grams resolution. It appears that for distance and speed task, more weight means a better outcome. The graphs also show the maximum glide ratio and maximum flight efficiency. For distance task it is good to move between the maximum of these variables. For Evolution model the trim speed is almost the same as the speed for maximum glide ratio. All calculations are for a model with control surfaces (v-tail, elevator, ailerons, flaps) in neutral position.

Computer analysis model performance

Descent rate

Evolution F3B - descent rate in full scale velocity Evolution F3B - descent rate for low velocity Evolution F3B - descent rate for high velocity
Full scale velocity Low velocity High velocity

Flight effeciency

Evolution F3B - flight effeciency in full scale velocity Evolution F3B - flight effeciency for low velocity Evolution F3B - flight effeciency for high velocity
Full scale velocity Low velocity High velocity

Glide ratio

Evolution F3B - glide ratio in full scale velocity Evolution F3B - glide ratio for low velocity Evolution F3B - glide ratio for high velocity
Full scale velocity Low velocity High velocity

Trim speed and forward speed

Evolution F3B - trim speed Evolution F3B - forward speed
Trim speed - all control surfaces (elevator,aileron, flaps) are in neutral, then model have stable speed where curve intersect x-axis on graph. Graph shows the dependence of the flight speed to the forward speed (x-axis projection)

Airflow visualisation at speed 10m/s

Evolution F3B - airflow visualisation at speed 10m/s (perspective view) Evolution F3B - airflow visualisation at speed 10m/s (left view)
Perspective view Left view
Evolution F3B - airflow visualisation at speed 10m/s (back view) Evolution F3B - airflow visualisation at speed 10m/s (top view)
Back view Top view

Presure visualisation at speed 10m/s

Evolution F3B - presure visualisation at speed 10m/s (top view) Evolution F3B - presure and airflow visualisation at speed 10m/s (top view)
Presure visualisation Presure and airflow

Drag and lift distribution at speed 10m/s

Evolution F3B - induced drag and velocity drag distribution at speed 10m/s (top view) Evolution F3B - wing and V-tail lift distribution at speed 10m/s (back view)
Induced drag and velocity drag distribution Wing and V-tail lift distribution

Evolution v-tail - Performance

Evolution F3B sailplane

Custom color scheme desinger

COLOR PALETE
  • RAL 9003
  • RAL 1016
  • Jitom Orange
  • Jitom Blue
  • Jitom Green
  • RAL 3020
  • RAL 4005
  • RAL 4006
  • RAL 5015
  • RAL 7031
  • Carbon fibre
  • RAL 5002
  • RAL 9005
OPTIONS
VIEW
Code:  - - - - 
  •  
  •  
  •  
  •  
 
 
 
 
 
 
 
 
HELP/INSTRUCTIONS Here is picture, where areas are described.
  1. Click on one block in area -3-.
  2. Click on one color in "Color palete", area -1-.
  3. Wait until progressbar set to status done.
  4. Access to control hide/show layer in "Options", area -2-.
  5. Change view availaible after click on current picture in area -5-
  6. In send an order, use code in area -4- (or PrintScreen). Export to image file is not available yet.

Evolution v-tail - Mounting

Evolution F3B sailplane

v-tail driving system

Torsion "RDS" servo drive...

Thin and precision servo driving surfaces. Instalation instruction...

  1. To form the cogwheel of the servo into the aluminium use a good liquid mould-release. You can use slightly thickened Epoxy for this.

  2. You have two different bended steel. The more bended (55 deg.) is for flap and the other one (40 deg) for aileron.

  3. First you have to fix the servo-mount in the wing. Make a drawing on the wing like shown on the picture and glue the servo mount in the right position.

  4. Next step is to glue the brass-tube into the bar.

  5. Last step is to glue the bended steel into the aluminium. To gauge it on the right place you take a long time-epoxy and mount it in the wing. Then you must move the flap up and down two or three times and the steel will gauge automaticly. Fix the flap in a neutral position and wait 12 hours. Make sure that the little screw on the aluminium is on the upper side !!!!

  6. After all use a teflon-grease on the steel and the slot. This helps to minimize abrasion and radial clearance in the future.

    For the installation of Futaba servos S3150/S3155 for the RDS linkage we recommend these servo frames: http://www.rcsolutions.ch/index.php?show=64 

Evolution v-tail - Settings

Evolution F3B sailplane

Settings table for EVOLUTION

Trim positions Flaps Ailreons Elevator Rudder
Normal 0 0 0 0
Termic 3 0,5 to flap 0 0
Speed 0 0 0,7 0
Start 14 1 to flap 0 0
Butterfly max down 5 4 0
Deflections Flaps Ailreons Elevator Rudder
Normal 5/3 16/10 7/7 8/10
Termic 0 13/5 7/7 8/10
Speed 6/4 20/13 6/6 0
Start 0 20/2 7/7 10/12
Butterfly 0 20/12 7/7 8/10
Wing mix Elevator->Flaps+Ailreons Ailreons->Rudder
Normal 4+3 3
Termik - 7
Speed 4+3 1
Butterfly - 8
Towhook: 122 mm from end of cabin.
Center of gravity: from the leading edge 99 mm
up deflection/down deflection

Settings templates

EVOLUTION wing settings template EVOLUTION v-tail elevator settings template

Evolution v-tail - Pictures

Evolution F3B sailplane

Final model

Jiri Tuma training day - 21.6.2009

CAD - CAM pre-production form

Virtual testing servos in fuse

Production first prototype models

Evolution v-tail - Results

Evolution F3B sailplane

Jiri Tuma training flights, altitude logs - 10.6.2009

Maximum is 343 meters! Average cca 300 meters. Wind aprox. 4-5 m/s. Evolution F3B altitude logs

Evolution v-tail - Prices

Evolution F3B sailplane

Pricelist, model versions and order

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Desing and Programing: Michal Michna - 2009
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