Rotmilan Midi F3F
The Rotmilan Midi has thoroughbred papers! Evolved from the F3F World Champion Rotmilan (3.02m span), and using the same, proven HN Straak airfoil, the Rotmilan Midi at 2.86m wingspan is just naturally FAST and quite competitive.
Rotmilan Midi makes quicker work of aggressive, bank-and-yank turns in medium to high winds. In strong, eye-watering wind conditions, Rotmilan Midi doesn't need very much ballast to be competitive, and manages cross winds well. Rotmilan Midi performs energy-management turns (roll to inverted, pull through) quite easily and predictably, retaining maximum energy and exit speed.
Overall, Rotmilan Midi is a well-mannered aircraft. Its HN airfoil requires minimal camber changing flap deflection to be effective in a wide range of conditions/speeds. "Snap-flap" angles in pylon turns are of necessity kept to a minimum to prevent unnecessary speed-scrubbing drag. Rotmilan Midi's shorter wingspan and shorter tail-moment but same-size tail surfaces, compared to its Rotmilan sire, makes for a much more agile, but equally stable aircraft.
Rotmilan Midi's fuselage is made from Kevlar and carbon. The front section is Kevlar only. The single-piece ballast tube and servo tray is already installed in the fuselage. The tray is designed to receive 12mm standard servos like the MKS 6125e or equivalent.
The fuselage requires very little work to set up. The canopy is fiberglass with the lock system already in place. The elevator control rods are "snakes" using fiberglass core and Teflon sleeve which are guided through a plastic sleeve. No clevises or couplers are provided.
The tail planes are identical to the standard Rotmilan and include the carbon rod joiners. The manufacturer still uses the very simple and efficient aluminum control horns connected to a metal clevis.
The wings are simple carbon using Herex and spread tow fabric. The servo holes are reinforced with some extra carbon to avoid skin deformation while installing the servo frames. There is no ballast compartment in the wings. The large carbon joiner allows the use of brass ballast (not provided), to be added to the 900g of fuselage ballast provided with the kit (10 slugs).
RTGmodel was the first manufacturer to use RDH/LDS. As it is built in, the installation on the control surface side is finished, and removable using a tool provided in the kit - a long brass rod that allows extraction/insertion of the RDH axis from the root chord.
The Rotmilan molding quality is absolutely top notch. Fit and finish are just superb: the joiner slips into the wings and the fuselage with no slop at all. In fact, when removing the joiner, you might just hear hear a “popping” sound!
Video by Pierre Rondel (from on-board and ground-based cameras!)