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Difference between revisions of "Moyes Dragonfly"

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(Airspeed indicator)
(Version 1.0)
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|type =1-engine ultralight
 
|type =1-engine ultralight
 
|fdm =JSBSim
 
|fdm =JSBSim
|status =early-production v0.4
+
|status =production 1.0
 
|authors =Torsten Dreyer
 
|authors =Torsten Dreyer
 
|fgname = <tt>Dragonfly</tt>
 
|fgname = <tt>Dragonfly</tt>

Revision as of 09:09, 8 April 2009

Moyes Dragonfly
Dragonfly-towing.jpg
Type 1-engine ultralight
Author(s) Torsten Dreyer
FDM JSBSim
--aircraft= /Dragonfly
/Dragonfly

/Dragonfly

/Dragonfly

/Dragonfly

/Dragonfly

/Dragonfly

/Dragonfly

/Dragonfly

/Dragonfly

/Dragonfly
Status production 1.0

About the aircaft

This is a model of a Moyes Dragonfly, a microlight plane built by MOYES, Australia orignally designed by Robery Bailey of Florida. It is made of aluminium tubing, wing and empennage have a dracon skin. The pilot sits on the very front of the main tube with a breathtaking, undisturbed view.

The dragonfly has excellent slow flight characteristics and is suitable for towing of hang gliders.

The same basic design is also known as the Bailey Dragonfly, Bailey-Moyes Dragonfly, and has variants with considerable modifications and variations. The FGFS model is based on the design produced by Moyes.


Features

Basic flying

Basic flying features are quite simple and almost perfect as a starter for pilots. Takeoff and landing is simple and due to it's slow flying speed, the Dragonfly is perfect for scenery exploration.

Instrumentation

The airspeed indicator gauge can be configured to display either km/h, mph or kts by setting the property /instrumentation/airspeed-indicator/texture to either

  • Airspeed-kmh.rgb
  • Airspeed-mph.rgb
  • Airspeed-kts.rgb

This can be done on startup as a command line switch or at runtime by setting the property with the Property browser.

Example: Use airspeed indicator calibrated in KTS:

fgfs --aircraft=Dragonfly --prop:/instrumentation/airspeed-indicator/texture=Airspeed-kts.rgb


The FlightGear model of the Dragonfly supports banner towing. The banner to tow has to be picked up from the ground during the flight and can be released in flight before landing.

Configuration

Do use this feature, a small configuration file is needed telling FlightGear where the banners are on the ground. It is a small XML file placed in your FlightGear home directory (which is ~/.fgfs on Linux, ...Program Files\Flightgear\data for Windows) named groundbanner.xml. Create this file and paste the following content into it. It will tell Flightgear where to put the banner:

<PropertyList>
  <groundbanner>
   <path>Aircraft/Dragonfly/Models/GroundBanner.ac</path>
   <lat type="double">37.6199</lat>
   <lon type="double">-122.3735</lon>
   <heading type="double">280</heading>
 </groundbanner>
</PropertyList>

This example places one banner at KSFO left to 28R at the runway intersection. There can be any number of <groundbanner> elements to place more of them.

You can verify that the banners were loaded on the output of your console window. For each configured and loaded groundbanner there is a message

GroundBanner created
Banner on the ground


Using

Approaching the banner
Banner picked
Banner released


To pick up the banner from the ground, approach the rope between the two pylons at an altitude of less than 15ft agl. You have to be very close to the center of the rope to catch it. When the pickup succeeded, a message is printed on the console window

banner-pickup

and you will notice a change in the flight-behaviour due to the increased drag caused by the banner on your tail. You can see the towed banner when looking back or changing the view. you can release the banner by pressing the 'o' (lower case letter, not zero). You will notice a decrease of the drag and can see the banner falling down when looking at it.

Issues

  • aerodynamic coefficients are a very rough guess
  • aerodynamics and movement of the banner is far from being realistic
  • banners do not disappear from ground after pickup
  • add a pilot when viewing from outside

Related lists

External links