Flandria is a brand of mopeds made in Belgium by the A. Claeys Flandria company. The company was founded in the early 1800's as a blacksmith company and produced many various products, including bicycles and mopeds, and has been passed down through the family. The bicycle team of Flandria is renowned for it's racing prowess. In one story, after a family trip to Bermuda where they rode on motorized bicycles, they began manufacturing the Flandria Bermuda moped. There were 2 models sold in the US, the Bermuda and the Apollo, in addition to numerous prized small motorcycles and mopeds for the European market.
Despite their enduring legacy, few Flandria mopeds remain and little information can be found.
The Bermuda is by far the most imported of the Flandria bikes, but still remain quite rare compared to other makes. Presumably many were sold and used as resort island rentals in Bermuda. The Bermuda was a swung belt-driven motor but nonvariated, similar to the motobecane and peugeot but more similar to the batavus Laura m48. Later Hero/Ankur mopeds such as the panther may be a direct copy of the Flandria bermuda motor as opposed to the m48 or 102 as others have speculated. The Bermuda mopeds were imported from 76 to 79, and came in two models, the Hamilton and the Hampton which had upgraded factory accessories. There are 2 motor varieties: a 25mph and restricted 1hp 20mph version.
The Apollo was a smaller nonvariated motor. The initial motor design features many very unique attributes.
The motor is mounted by the head and rear of the case. It's started with a backpedal kickstart similar to Tomos. One interesting fact about the motor is that the cylinder studs arranged 45 degrees to parallel with the direction of the bike. The transfers exist almost entirely in the cylinder (similar to a v1) and the head is attached separately to the cylinder again rotated 45 degrees to be back in line with the parallel of the bike.
The single speed clutch consists of a set of large motorcycle style pads and plates which are automatically engaged by centrifugal force of a set of small ball bearings against a ramp plate. Another unique design element the clutch engages against a set of roller bearings in a cage on a set of saw toothed ramps concentric around the shaft. These are forced out when the engine is driving the motor but allow the clutch to essentially freewheel and coast freely whenever the engine is not actively driving the wheel.
Perhaps most interesting however is the unique approach to case induction. It's rotary valve case inducted, like a vespa, or ke100, or any of a billion great 2 strokes - rotary case induction, nothing new. The way EVERYONE ELSE IN THE WORLD does rotary induction is a window in the crank lobe that sets when the intake opens and closes. Instead the Apollo has a window IN THE CRANK SHAFT.
That's right. A window on the crankshaft opens up (2 in the image) and draws the charge THROUGH THE CENTER OF THE CRANKSHAFT into the crankcase (3). There is a larger windowed piece that slips over the crankshaft window marked (1) in the pic, that's held on with a single ball bearing, presumably to make a smoother window where the intake contacts.
Later versions of the Apollo motor featured a more typical piston-port design, but the other unique design choices remained. The later model piston port cases can be differentiated by a squared off coffin shaped flywheel and clutch cover as opposed to the round egg-shaped covers of the predecessor.
One of the best sources of information is Myron's here: http://www.myronsmopeds.com/wp-content/uploads/2015/06/Info-Flandria.jpg
Also the factory manual can be found here: https://vintagemopeds.files.wordpress.com/2013/10/bermuda_flandria-owners-manual.pdf
More information on the Apollo can be found in this thread: http://www.mopedarmy.com/forums/read.php?1,3894663