I love flying formation and mock dog fight under FPV. But without an effective aiming device, one just can not be sure how well he can stay on a bogie's tail. So I persuaded a master scale builder, Tim Noack, to build a 1:7.5 working reflector sight with collimating optics that focus at infinity and corrects for parallax.

The result is absolutely stunning...

FPV Avios Spitfire with Reflector Gun Sight (6 min 53 sec)

functional Mk VIII reflector gunsight for RC warbirds FPV part 2 (1 min 52 sec)

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Son chased my Spitfire using a Armattan Chameleon Ti quad Found the camouflage works great at blending in with the green hills. Will be hard for the Hun to jump on this Spitfire from afar

Avios Spitfire Mk Vb Chase Teaser (1 min 31 sec)