The main objective of the study is to design blades for chopping heart rice straw. This study is composed of three main testing parameters. The first parameter used is speeds at which the knife blades that will chop the straw. They will have 2 speeds one at 540 and the other at 720 rpm. The second parameter is the types of blades that will be used eclipse blades and smooth blades. The last parameter is the cutting edges. The eclipse and smooth types of the blades will have 4 5 and 6 cutting edges. For this test we use stubble sorted 50 heart rice straws. Placing the straw on the prepared steel and test with all three testing parameters repeating each testing parameter thrice and record the results. Based on the testing and evaluation the 6 edge eclipse blades with a speed of 720 rpm. Yielded the highes results for chopping heart rice straw at 66 percent. For the 6 edged smooth blades with a speed of 720 rpm the yield results for chopping heart rice straw was at 35.76%

Thesis this has the objective for design build and test ability in the work of set propeller wind generator by divide recording is 3 period in morning noon and evening each phase 1 hour record speed wind value capacity air value and electrical resistance every 10 minute. Of the periment form wind nature source and model with electric fan. The result stud makes to know that propeller at have property that is appropriate area stet experimental at wind speed 2 – 2.5 m/s is propeller make from pipe PVC by propeller has length 1.30 m. the area in front cut a propeller 0.16 m. through a propeller the corner twists in installation propeller