IcedStorm777
Well-known member
Ok so, I am going to preface this by saying I know there is a specific discussion for the legitimate BDF's but I really want to try making my own, I will make many mistakes but am going to see if i can run some experiments. So here are the goals:
1. Make a 3d printed EDF that is satisfactory and can produce X amount of thrust with Y amount of run time (I will fill these numbers in once I have done the calculations for goal three.
2. Run experiments with said 3d printed EDF including things like compression, nozzles, and exhaust shape (De laval, aerospike, etc.)
3. Put these EDF's in RC versions of some of these: F9F Swept Wing Cougar, F-11 Tiger, F-5 Freedom Fighters, and MB 339.
4. Have a fun time, don't die trying, and post findings.
So a few questions right off the bat. Would it be beneficial to have a sort of compressor stage? Here is what i mean by this. With 3d printing i can easily make complex geometry shapes. The beginning of the fan tube (these will all be done in tubes so i can test different diameters and geometries. So the beginning of the nozzle would be a fairly average size and there would be a standard EDF Fan blade. Now on the same motor shaft that is driving the EDF Fan blade there would be, say, four compression blades. Immediately following the standard EDF Fan blades there would be four compression blades and as the compression blades go further back, the tube would compress. The nozzle would than open back up similar to a De Laval nozzle. My theory is as such: The fan will suck the air past it but as the air goes through the compression blades and as the tube compresses the air will be forced to move much faster to escape with the same pressure which would greatly increase thrust to energy power. The reason that the nozzle will not be super constricted to lower the spool time. Any thoughts are appreciated, I will post pictures and progress over the weekend if i find time, i am very busy this week so we will see how this works out. Thanks
1. Make a 3d printed EDF that is satisfactory and can produce X amount of thrust with Y amount of run time (I will fill these numbers in once I have done the calculations for goal three.
2. Run experiments with said 3d printed EDF including things like compression, nozzles, and exhaust shape (De laval, aerospike, etc.)
3. Put these EDF's in RC versions of some of these: F9F Swept Wing Cougar, F-11 Tiger, F-5 Freedom Fighters, and MB 339.
4. Have a fun time, don't die trying, and post findings.
So a few questions right off the bat. Would it be beneficial to have a sort of compressor stage? Here is what i mean by this. With 3d printing i can easily make complex geometry shapes. The beginning of the fan tube (these will all be done in tubes so i can test different diameters and geometries. So the beginning of the nozzle would be a fairly average size and there would be a standard EDF Fan blade. Now on the same motor shaft that is driving the EDF Fan blade there would be, say, four compression blades. Immediately following the standard EDF Fan blades there would be four compression blades and as the compression blades go further back, the tube would compress. The nozzle would than open back up similar to a De Laval nozzle. My theory is as such: The fan will suck the air past it but as the air goes through the compression blades and as the tube compresses the air will be forced to move much faster to escape with the same pressure which would greatly increase thrust to energy power. The reason that the nozzle will not be super constricted to lower the spool time. Any thoughts are appreciated, I will post pictures and progress over the weekend if i find time, i am very busy this week so we will see how this works out. Thanks