|Xplorer RC Sailplane Amazing Performance|
|Charles Grant Designed - Cloud Tramp|
“The aerodynamic form and contour of the modern airplane are determined by the performance required of it.” “Drag increases at the square of the speed” and “to further reduce drag all corners and angular contours were replaced with smooth curves”. It had me thinking about what I had witnessed mainly in radio control sailplane flying this past year and how the performance differs so greatly with the aerodynamic form of the sailplane.
|Shadow Left - Gentle Lady Right|
Having participated in more thermal duration contests this year I was amazed at the performance of the top designs such as the Xplorer and Supra. In studying the form it is evident that angular contours had been replaced with smooth curves where possible. In flying in thermals the speed is normally not so great but zooming off the launch or flying out of sink reaching a higher speed is important. I realize there are many other factors why my box fuselage Gentle Lady sailplane was so much lower in performance than a Supra but extra drag is part of it. A couple of years ago I did a hand toss test between my Gentle Lady and a Shadow 2 meter sailplane which is very sleek but heavy. The length of the glide of the Shadow was many times that of the Gentle Lady.
|Curves in Fuselage of Dart Slope Glider|
|Foam Super Scooter Has Lots of Drag|
This past year I have done a lot of slope soaring from small slopes and the drag of the sailplane makes a huge difference there. It is the difference between not being able to fly for more than a few seconds or being able to slope soar for several minutes. On one slope I have been dynamic soaring and the sleek glider not only will stay up longer, it is also much easier to fly.
Volare Cloud Tramp Review
Dynamic Soaring One Year Progress
Slope Soaring Heavy 2 Meter RC Gliders
Comparing Two 2 Meter RC Gliders