CREATE TABLE table_203_823 (id DECIMAL, "model name" TEXT, "date" TEXT, "type" TEXT, "thrust  ( kg )  / power  ( eshp ) " TEXT, "fitted to" TEXT)

what model is listed next after tr-2 ?
SELECT "model name" FROM table_203_823 WHERE id = (SELECT id FROM table_203_823 WHERE "model name" = 'tr-2') + 1
SELECT "model name" FROM "table_203_823" WHERE "id" = (SELECT "id" FROM "table_203_823" WHERE "model name" = 'tr-2') + 1