I'm confused about the AU regs. I've read some here and some there, but you have more types... 19 reg, 24 reg, VH reg.
We just have the VK reg.
All planes registered as microlights here are either Class 1 (single seat) or Class 2 (twin seat). 45Kn stall in the landing configuration, flaps up, flaps down, no flaps, all designers choice, just under 45 knt. Plans, Kit, Factory, doesn't matter, weight and maintenance regs are the same for all Microlights. What they are registered as (ML vs GA) determines the regs they operate under, Not HOW they are made.
NZ) https://www.caa.govt.nz/Advisory_Circulars/AC103_1.pdf
UK) www.bmaa.org/pwpcontrol.php?pwpID=3151
The NZ one: from AC 103-01
The definition of a microlight aircraft is found in Rule Part 1 and is repeated below:- Microlight aircraft means a basic low performance aircraft designed to carry not more than 2 persons which meets low momentum parameters that are acceptable to the Director:
The following specifications are considered as an acceptable means of compliance to meet the definition of a microlight aircraft:
any of the microlight specifications called up in the type design standards listed in Appendix 1of this AC.
or
a 1or 2 seat aircraft whose stall speed in the landing configuration at maximum gross weight does not exceed 45 Knots and whose maximum gross weight does not exceed:
For a 2 -place landplane 600 kg; or
For a 2 -place seaplane or amphibian 650 kg; or
For a single place landplane does not exceed 510 kg; or
For a single place seaplane or amphibian does not exceed 550 kg
However, sometimes the info given on the site does not always match, see:
"2. In the absence of certification to the above standards, an aircraft that meets the specifications below may still be defined as a Class 2 Microlight:
a. If 6 or more aircraft of the type been operated and the aircraft type has achieved a documented satisfactory airworthiness history of at least 150 hours of flight including at least 50 hours of flight on one aircraft; or
b. If the aircraft is a New Zealand designed prototype, a temporary flight permit has been issued for the aircraft and the aircraft has satisfactorily completed the required endurance test.
Ref. 103.207(a)
c. Performance and Weight Limitations
A one or two seat aircraft whose stall speed, in the landing configuration, at maximum gross weight does not exceed 45 knots, and having a maximum gross weight of:
•
544 kg for landplanes;
•
579 kg for a single-place seaplane or amphibian;
•
614 kg for a two-place seaplane or amphibian. "
As in https://www.caa.govt.nz/ga/sport_&_rec/guide_for_micro_importers.pdf
Hmm
It looks like the old 544Kg may have been lowered to 510 with a 2012 change of the 103 regs.