Astra RNR1

{{Short description|Group 6 sports prototype race car}}

{{Infobox racing car

| Category = Group 6

| Designer = Roger Nathan

| Production = 1969

| Team =

| Drivers =

| Chassis = fibreglass body on box-section triplex monocoque with front and rear subframes

| Front suspension = double wishbones, coil springs over dampers, anti-roll bar

| Rear suspension = Reversed lower wishbones, top links, twin trailing arms, anti-roll bar, coil springs over dampers

| Engine name = Ford-Cosworth FVA/Coventry Climax {{convert|1.6-2.0|L|cuin|0|abbr=on}} naturally-aspirated I4

| Capacity =

| Configuration =

| Turbo/NA =

| Engine position = mid-engined, longitudinally mounted

| Gearbox name = Hewland FT-200

| Gears = 5-speed

| Type = manual

| Differential =

| Weight = {{cvt|550|kg|lb}}

| Fuel =

| Lubricants =

| Debut = 1969 1000 km of Nürburgring

| Races = 49

| Wins = 15

| Cons_champ =

| Drivers_champ =

| Teams_champ =

| Poles = 6

| Fastest_laps =

| Podiums = 27

| Successor = Astra RNR2

}}

The Astra RNR1 is a Group 6 sports prototype race car, designed, developed, and built by amateur British racing driver Roger Nathan, in 1969. It debuted at the 1969 1000 km of Nürburgring, where it was driven by Roger Nathan and Mike Beckwith. It competed in sports car racing between 1969 and 1976, where it found relative, but respectable success. It scored 15 race wins (including 1 additional class win), achieved 27 podium finishes, and clinched 6 pole positions. It powered by either a {{cvt|2.0|L|cuin}} Coventry Climax, or a {{cvt|1.6|L|cuin}} Ford-Cosworth FVA, naturally-aspirated four-cylinder engine.{{cite web|url=https://www.racingsportscars.com/type/Astra/RNR1.html|title=Astra RNR1|access-date=28 June 2022}}{{cite web|url=https://www.racingsportscars.com/type/photo/Astra/RNR1.html|title=Astra RNR1|access-date=28 June 2022}}{{cite web|url=http://www.racingyears.com/chassis.php?Chassis=Astra%20RNR1%20-%20Climax|title=Astra RNR1 - Coventry Climax|access-date=28 June 2022}}