CREATE TABLE "table1_16439764_1" (
  "gun" text,
  "m_v_ft_s" real,
  "shell_lb" text,
  "time_to_ft_m_at_25_seconds" text,
  "time_to_ft_m_at_40_seconds" text,
  "time_to_ft_m_at_55_seconds" text,
  "max_height_ft" real
);

Question: How many feet per second does a shell move where the height range is 23500?
SQL: SELECT MIN("m_v_ft_s") FROM "table1_16439764_1" WHERE "max_height_ft"=23500;

Question: If the gun used is the qf 12 pdr 12 cwt, what is the shell weight?
SQL: SELECT "shell_lb" FROM "table1_16439764_1" WHERE "gun"='QF 12 pdr 12 cwt';

Question: Where the height range is higher than 20000.0 and the shell weight is 12.5, what is the time to feet ratio at 25 degrees?
SQL: SELECT "time_to_ft_m_at_25_seconds" FROM "table1_16439764_1" WHERE "shell_lb"='12.5' AND "max_height_ft">20000.0;

Question: What gun has a time to feet ratio of 18.8 at 55 degrees?
SQL: SELECT "gun" FROM "table1_16439764_1" WHERE "time_to_ft_m_at_55_seconds"='18.8';

Question: What is the maximum foot per second speed where time to feet ratio is 22.1 at 55 degrees?
SQL: SELECT MAX("m_v_ft_s") FROM "table1_16439764_1" WHERE "time_to_ft_m_at_55_seconds"='22.1';

Question: What is the foot per second speed where time to feet ratio is 9.2 at 25 degrees?
SQL: SELECT "m_v_ft_s" FROM "table1_16439764_1" WHERE "time_to_ft_m_at_25_seconds"='9.2';