Astra RNR2

{{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 FVC {{convert|1.8|L|cuin|0|abbr=on}} naturally-aspirated I4

| Power = {{cvt|245|hp|kW}}

| 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 = 1970 R.A.C. Snetterton

| Races = 22

| Wins = 4

| Cons_champ =

| Drivers_champ =

| Teams_champ =

| Poles = 2

| Fastest_laps =

| Podiums = 6

| Predecessor = Astra RNR1

}}

The Astra RNR2 is a Group 6 sports prototype race car, designed, developed and built by British amateur racing driver, Roger Nathan, in 1969. Only two models were produced.{{Cite web|url=https://www.classicdriver.com/en/car/costin/astra/1969/788974|title=1969 Costin Astra - RNR2. Ex-Roger Nathan.|website=www.classicdriver.com}}{{Cite web|url=https://www.ultimatecarpage.com/car/5322/Astra-RNR2-Cosworth.html|title=1970 Astra RNR2 Cosworth - Images, Specifications and Information|website=Ultimatecarpage.com}} It debuted at an R.A.C. race at Snetterton, in 1970; being driven by Roger Nathan. It achieved moderate success in sports car racing, winning 4 races (plus 1 additional class win), scoring 6 podium finishes, and clinching 2 pole positions. It was powered by a naturally-aspirated {{cvt|1.8|L|cuin}} Ford-FVC four-cylinder engine, producing {{cvt|245|hp|kW}}.{{Cite web|url=https://www.asmonzaracing.com/photos-cars-walkaround-astra-rnr2-ch38-1970.html|title=Astra RNR2 chassis #38 - 1970|website=ASMONZARACING}} This gave it a power-to-weight ratio of exactly 0.45 hp/kg, or 1 hp/lb.{{Cite web|url=https://www.ultimatecarpage.com//spec/5322/Astra-RNR2-Cosworth.html|title=1970 Astra RNR2 Cosworth Specifications|website=Ultimatecarpage.com}}{{Cite web|url=https://rmsothebys.com/en/auctions/lf12/london/lots/r101-1970-astra-rnr2-fvc-racing-car/281251|title=1970 Astra RNR2 FVC Racing Car | London 2012|website=RM Sotheby's}}{{Cite web|url=https://collectorscarworld.com/1970-costin-nathan-astra-rnr-2/|title=1970 Costin-Nathan Astra RNR-2 - Collectorscarworld|first=Albion|last=Motorcars}}{{Cite web|url=https://autograf.cars/auctions/1970/Astra/RNR2?|title=Autograf | 1970 Astra RNR2|website=Autograf | Remarkable Vehicles}}{{cite web|url=https://www.racingsportscars.com/type/Astra/RNR2.html|title=Astra RNR2|access-date=28 June 2022}}{{cite web|url=https://www.racingsportscars.com/type/archive/Astra/RNR2.html|title=Astra RNR2|access-date=28 June 2022}}