Full Size Printed Plan twin-boom Slope soarer Wingspan 51” for Radio Control

& Building Notes

No material plans only

BOOMERANG

Exciting twin-boom Slope soarer

Full size printed plan on a sheet 32" x 24"

Three page of construction notes

Wingspan 51”

Radio Control

by Gordon Mackenzie

I've had a lot of fun with 'Boomerang' and it has claimed more than its fair share of attention both from flyers and interested members of the public who frequent our flying site.I didn't build 'Boomerang' with any particular function in mind, it's not 100% aerobatic because I simply cannot contemplate symmetrical or near symmetrical wing sections for gliders. Anybody will recognize that the Eppler 205 section is not happy upside down for long, but it has good penetration and speed range characteristics. It has become obvious to me that the role of the 'Boomerang' is in slope pylon racing because of the apparent efficiency in conservation of momentum in high rate turns and the good penetration and acceleration at low wing loadings. A pylon racing version would have to incorporate more space for ballast, however. I have entered the 'Boomerang' in a pylon race in which it came second mainly because I could not ballast it up enough. I say that anyway to save face: it's likely that my flying was at fault.

Thank you for your interest