RC Slope Soaring in Hong Kong

各位機友，最近聽聞有廠家出左個微型空速計，睇黎好容易裝坩，裝在模型飛機上便可以量度飛行速度。玩DS時用來度機速，唔使用支雷射槍咁麻繁，有冇人有興趣買番支返黎試試。

http://www.wingedshadow.com/index.html
http://www.rcgroups.com/forums/showthread.php?t=725587
http://www.ampaviators.com/index.php?option=com_content&task=view&id=71&Itemid=27

By using radar gun, we are measuring the speed relative to the gun (ground). The air speed sensor measures the speed relative to the air. When the plane is DSing and when it hits the wind over the ridge there should be a difference to the radar gun's reading.

Yes! But same principle, I think, in DS, the speed measured on the down wind leg should be higher than that of the uphill leg. If we use radar gun to measure the plane speed, we should measure it during the down wind leg to get the highest score. However, for practical reason, I think most of the measurements are done on the uphill leg.

Good ! I need one "full set"

I think a small GPS timer is better.
It give you speed measurement in relation to earth.

The system below is more advance (and more expensive) with real time telemetry and different sensors to select from, including a tiny GPS module!

http://www.eagletreesystems.com/Sailpla ... plane.html

In fact I do not have much interest in using it to measure the DS speed, but I think these data loggers are very useful in setting up our models. By using them we can know the minimum sink rate, best glide ratio and the highest speed. We can use these data to set up the flaps and elevators for different flight mode and different wing loading.

CM,

Add AI to your Demo with all these devices, your plane will fly F3F on it's own. and may land itself as well
All you have to do is to collect the winners award