Motionsic ARMS (Attitude Reference Miniature Sight)

1:7.5 Scale Collimating Reflector Sight for use with headtracking FPV camera in a RC plane cockpit. Designed to fit perfectly in models with wingspan between 1400~1700mm.  Useable for warbirds from 1200~2000mm wingspan.  See Common RC Model Scales for your plane. Attributes: Parallax free - each reflector sight is meticulously calibrated by hand, keeping reticle center point aligned with the plane's nose, regardless of head-tracking FPV camera movement.  Reticle center dot precision is comparable to red dot sights costing several hundred dollars. Excellent landing aid - ARMS reticle is designed to be used for precise attitude reference against the horizon, providing intuitive feel for level flight, climb and descent.  As well as precise landing approach reference and flare angle reference.  See landing video.   Dogfight fun - the Mark II reticle design is derived from Spitfire reflector sight in WW II.  So naturally it's an excellent tool for practicing dogfights with other FPV friends