▁radi ators , ▁which ▁were ▁white . ▁ ▁The ▁E PS ▁and ▁E CS ▁radi ators ▁were ▁red es igned ▁for ▁Block ▁II . ▁Block ▁I ▁had ▁three ▁larger ▁E PS ▁radi ators ▁located ▁on ▁S ectors ▁ 1 ▁and ▁ 4 . ▁The ▁E CS ▁radi ators ▁were ▁located ▁on ▁the ▁a ft ▁section ▁of ▁S ectors ▁ 2 ▁and ▁ 5 . ▁ ▁The ▁Block ▁I ▁fuel ▁cells ▁were ▁located ▁at ▁the ▁a ft ▁bulk head ▁in ▁S ector ▁ 4 , ▁and ▁their ▁hydro gen ▁and ▁o xygen ▁t anks ▁were ▁located ▁in ▁S ector ▁ 1 . ▁ ▁Block ▁I ▁had ▁slightly ▁longer ▁S PS ▁fuel ▁and ▁ox id izer ▁t anks ▁which ▁carried ▁more ▁prop ell ant ▁than ▁Block ▁II . ▁ ▁The ▁Block ▁II ▁a ft ▁heat ▁shield ▁was ▁a ▁rect angular ▁shape ▁with ▁slightly ▁rounded ▁corners ▁at ▁the ▁prop ell ant ▁tank ▁se ctors . ▁The ▁Block ▁I ▁shield ▁was ▁the ▁same ▁basic ▁shape , ▁but ▁bul ged ▁out ▁slightly ▁near ▁the ▁ends ▁more ▁like ▁an ▁hour glass ▁or ▁figure ▁eight , ▁to ▁cover ▁more ▁of ▁the ▁t anks . ▁ ▁C SM s ▁produced ▁ ▁See ▁also ▁ ▁Or b ital ▁module ▁Re entry ▁caps ule ▁Space ▁caps ule ▁Space ▁suit ▁Space ▁expl oration ▁U . S . ▁Space ▁Ex pl oration ▁History ▁on ▁U . S . ▁St amps ▁Apol lo ▁L un ar ▁Module ▁ ▁References ▁ ▁Category : C rew ed ▁space craft ▁Category : M issions ▁to ▁the ▁Moon ▁Category :