NORTHERN IRELAND MODEL SOARING ASSOCIATION

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Discus & Handlaunch Flying

 

Handlaunch flying is exactly what it sounds like. The model is thrown in to the air and then flown. There are two distinct styles, javelin and discus launch.

Javelin was the original style where the model was thrown like a spear or javelin, over arm in to the air. This had problems, it required a reasonable degree of physical fitness and flexibility. Injuries to shoulders and backs were not uncommon.

This led to people of lesser physical ability experimenting with Side arm launch (SAL) which metamorphed in to Discus Launch (DLG) In Dlg, the flier spins with the model like a discus thrower and releases the model with a whipping type motion. This requires less physical ability (but better timing!), and often results in a higher launch.

 

These 2 styles have produced distictive types of models to cope with the stresses of the different launch styles. The major distinctions are: as far as I am aware all DLG's are cross tail and have a sub fin. This helps to reduce yaw in the launch phase. DLG's are also generally stronger built, involving composite materials in various areas of their construction.

Some "entry" level models for these disciplines

Javelin

terminator

This is a Terminator for Javelin style launching, simple to build from the instructions on the Charles River RC site ( see Gallery Page for more detail)

Basic hlg model

An unknown model, but it demonstrates the simplicity of this type. Again for javelin style launch.

 


Discus

Gambler +

This is a Gambler+, built from plans by Wright Brother RC, they also do a kit for this.

Mountain Models DL50

DL50 from Mountain Models.

Some more advanced models

 

Feather

The Feather XL from Raptor Aerosports. A competitive Javelin launch model

Supergee

Competitive DLG model. Plans available on theCharles River RC site. designed by Dr Mark Drela

 


Boomer EX2

Even wings can be discus launched. although they tend to be more fun models than for competition. The Boomer EX2

 


There are some excellent links for DLG/HLG at The F3k Website. Including some slow motion video footage of DLG launching.