First, I'll admit to being a total "newbie" when it comes to really looking at the F3C regulations and have no background on why certain things "are the way they are." I have a couple questions about the interpretation of the regulations which I'm hoping those more seasoned in F3C can help me with.
The regulations contain the following wording with regards to gyros:
"GYROS: The use of automatic stabilisation devices that utilise external references is forbidden. The use of pre-programmed flight manoeuvres is forbidden. The use of an electronic rate sensor is limited to rotation about the yaw axis."
It clearly states "rate sensor" for the yaw axis only. Yet heading hold gyros are being used which would seem to violate the regulations. Could someone help me with this one?
Further if one really wants to break down the rules, let's take a look at the wording with respect to flybarless systems. The first sentence says "that utilise external references." Well, the flybarless systems I'm thinking of do not use an external reference (CSM, V-Bar/V-Stabi).
The second sentence is fine and I totally agree with that for now and the future.
The third sentence states "rate sensor." What is the definition of a "sensor"? Is it the physics being used within a device/part, is it the output of the sensor device/part, or is it a unit as a whole such as a gyro? What is a "rate sensor"? Is it the rate of acceleration, angular rate/velocity, etc.? Seems to leave a lot of room for interpretation.
My other quandary is about the weight limits. Why do liquid fuel powered helis have a 6 kg limit without fuel yet electrics are limited to 6 kg with "fuel"? Wouldn’t it be more “fair” to limit electrics to perhaps the average of 6 kg and the weight of the typical liquid fuel competition heli (that meets the 6 kg dry limit) full of fuel?
Any help on these issues would be appreciated.