Our neighbouring club held it´s annual fly-in the other day. It´s a really laid back day where every one does what he likes to do, which is mostly fly..
I took the opportunity to bring along my Carden, just to get it used to ´foreign lands´. The club is really only a few miles away, and they do have a nice field, although it is lined with trees on one side, and a nice big tree on another corner.
For reason only know to my inner self I did not fly there, but enjoyed myself anyway. The next weekend it did become clear why I had this nagging feeling something was NotRight.
This is what was left of the throttle servo, I made a stupid mistake, I left the original choke/throttle contraption on the carb, which resulted in the wrong bits blocking free movement of the carb arm at the wrong time. At least it explains the ´low voltage´ warning I got! Lucky enough the batteries had enough oomph to perform a quick kill! The engine was at idle at the time, so other than a fried servo, no harm was done. Since then I´ve had a few fligths without problems. I also did some sound measurements: Getting 72 dB at 25 meters in front of the plane, but 84 at 90 degrees, in line with the prop. This is with a Mejzlik 28*10 2 blade, running at 6150 RPM (temp =20C or thereabouts). In the air I see values of almost 7000 RPM, and you can hear that for sure. So, waiting for something with 3 blades now, and of course, keep the finger on the throttle!