<SNIP>Plans for ultralight aircraft that fit the Canadian Ultralight definition of 45 stall speed - 1200 lbs. gross weight! ................
I dont like to get all the Ultralight definitions of each country, but certainly 300kg is a bit low
And in some European countries I can remember a 4 seater composite is also called Ultralight.<SNIP>
USA:
In the U.S.A. an ultralight is defined in Federal aviation regulations FAR Part 103 (and subsequent advisory circulars) as
a *single* seat powered flying machine which weighs less than 254 lbs, has a top speed of 55 knots (63 mph), stalls at 24 knots (28 mph) or less and carries no more than 5 gal. of fuel. Excluded from the empty weight are floats for water landings and safety devices intended for deployment in an emergency. The weight allowance for an emergency parachute is 24 lbs. so an ultralight with a parachute could weigh 278 lbs.
Australia:
In Australia, the ultralight definition is......
1. Less than 300Kg Max takeoff weight for uncertificated single seaters and 480 KG for certificated single seat and 2-seat ultralight aircraft.
GLYN: Almost like our 'old' Microlight class
Canada:
ULTRALIGHT SINGLE-PLACE AEROPLANE:
Power-driven aircraft designed to carry not more than ONE person and having a 'launch weight' not exceeding 165 kg (363.8 lbs) and a wing area of not less than the 'launch weight' minus 15 divided by 10, but in no case less than 10 sq. meters (107.6 sq. ft.).
ULTRALIGHT TWO-PLACE AEROPLANE:
Power-driven aircraft designed to carry not more than TWO persons and having a 'launch weight' not exceeding 195 kg (429.9 lbs) and a wing area not less than 10 sq.meters (107.6 sq. ft.) and a 'Wing Loading' not greater than 25 kg/sq meter, calculated using the 'launch weight' plus the occupant weight of 80 kg (176.4 lbs).
Source:
http://www.ultralighthomepage.com/ultraFAQ.html#q1
Europe
The JAA definition includes:
single seat landplane up to 300 kg
two seat landplane up to 450 kg
maximum stall (Vso) speed 35 knots (65 km/h)
Source:
http://en.wikipedia.org/wiki/Ultralight_aviation#Europe
Regards
Glyn