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(Edit on 10-20-21: In the following posts Kv or KV is used to describe brushless EDF motors. It is not kilovolt. The Kv rating is the ratio of the motor's unloaded RPM to the peak voltage on the wires connected to the coils.) I'm building a rocket using a 70 mm Electric Ducted Fan (EDF)...

I'm using a small (25 mm dia) button load cell for a static test stand. I built it to test small motors, but presently, I'm using it to check electric motors with propellers and electric ducted fans (EDF's). I believe the capacity of the load cell is 50 kg, and I obtained it through Amazon...

Please note, I will be posting information on this project when I have more information. Please don't respond to this thread at this time. Thank you. Richard I want to develop a small lifting body design. Initially balloon or rocket lifted during development and controlled to...

I used one of the seven (7) 29 mm CTI G33's I had in a static test stand at FAR on Saturday (09-19-20). I wanted to test the 3-D printed TVC gimbal to assure it would hold up before using the G33 in my rocket. One concern I had was the spike shown on the graph obtained from ThrustCurve (shown...

I'm creating a vertical test stand to eventually test research hybrid motors. I want to test solids first to work the bugs out, and I have a larger version I would like to build. Following are some photos. I ordered a 50 Kg button cell from Robotshop and hasn't arrived yet. Because the stand...

I don't have previous experience using small servos. I'm learning and gaining an appreciation of what they can do. I have two major applications. The first is small control surfaces on a HP rocket. The second is servos on a TVC gimbal mount for a low to mid-power rocket, up to 38 mm...

I see some threads concerned about simulated launch rail exit velocity but none about measured velocity. Has anyone compared simulated launch rail exit velocity with what was actually measured? I have some vague ideas about how to measure exit velocity, but I'm curious about ways people think...

I wasn't really sure what to title this thread. It's not active stabilization, because I want to include rockets that are aerodynamically stable. And, it's not just the up part because I'm interested about controlling recovery. Anyway, hopefully the title is appropriate. I have some...

Has there ever been a website with a list of people interested in rocketry with their name and location? I don't think a list that would include email or phone numbers would be a good idea. Good place for spammers! However, if there was a list with names, mail address, and perhaps a couple...

Where is NARCON going to be held next year?

I have some questions regarding the BPS Space system and perhaps others that are developing similar systems. I hope this helps others too. What's the status of usable motors for the BPS Space system? I've seen that Joe Barnard is testing the new system he is working on using the G8. Please...

I believe the following applies to both model and high-power rockets. I have the referenced sections of NFPA 1122, Model Rocketry that's in the California Fire Marshal handbook. The following is from the handbook. California codes for amateur rockets also stipulate mechanical methods to...

Not Earth-shaking, but maybe useful for many different applications such as actuating hatches, deploying legs, recovery deployment, stabilization. I'm creating a low pressure (10 psi) miniature pneumatic system to retract and extend legs on a model-sized rocket. The 1/4" pneumatic actuator...

This is an experiment I conducted about 6 years ago after hearing some comments about a 'pop' heard during a rocket flight. Some believe that this is the sound of the rocket breaking Mach. It's actually the sound of pieces of propellant being ejected out the nozzle. You can't hear the sound...

I've been developing side deployment hatches to help get rockets down quickly for a couple years. I use small parachutes (9") and deploy from 2 hatches at the aft end. So, the rocket comes down nose first with the small parachutes trailing the rocket. The descent is a lot more "orderly" than...