I am a mechanical engineer with a strong background in aerospace design. I love unmanned systems for the level of cutting edge design and technology that goes into them and the amazing, world shaping things that they can do.
Please tell us a bit about your UAV interest
I am looking to learn more about the UAV community, practice and maybe teach about UAV design, and eventually to produce some of my own designs.
"Holy cow - that ground vehicle! A 3D LIDAR, a 2D LIDAR, an enormous cooled hyperspectral camera, a 2D Radar, DGPS, full autonomy and data blending and object tracking and avoidance. That is a hell of a (expensive) monster! And they have multiples!…"
"Hey, saw that you're in SoCal. We have a local SD Drone group that flies at least once a week, and then we have monthly meetings and discussions and what not. We also collaborate with the local FAB LAB, so there's access to a laser cutter,…"
"I made a mistake about the CoG issue. John is right - the height from the propeller plane to the CoG does not affect the pitch and roll moments, and, since unfixed bodies rotate about their center of gravity, the CoG location does not directly give…"
"Delrin warps a lot when machining deep, wide pockets (relative to the wall thickness). I'd recommend machining it from polycarbonate. Printing it is a good (but more expensive) option as well. I agree that you should try for narrower, faired…"
"@Dwgsparky You didn't actually contradict anything I said, so I fail to see the holes in my "theories". You're definitely contradicting what OP is saying though. I said OP's design requires expensive high performance slip…"
"Oh, you're talking about throttling the IC engine up and down. I just assumed you weren't, because, frankly, it's very inefficient.
1 kg of fuel has 46 MJ of extractable energy. An IC engine throttling up and down has an average…"
"@Armen Well, I saw that diagram. You realize that mechanically, that doesn't function like you want it to, right? If your gas engine is driving your propellers at 3000 rpm, and your electric motors try to spin at 4000 rpm, it's not going…"
""We are using brushless motors which are mounted to the frame. The shafts of brushless motors are directly connected to the bevel gears driving the props."
Could you post a simple diagram of what you mean by this?"
"Uh, thanks for the laugh? An IC engine running a peak efficiency (100% load and whatever rpm maximizes efficiency) is exactly what a generator is, and is exactly what is being proposed here. No one is saying that you're throttling, so…"
"I'm not sure, but I get the impression that some of you are misunderstanding the design. The idea is to run an engine into a drive system that spins the bottoms of the (presumably small, weak) electric motors, and then use the battery packs to…"
"Guys, I'm all for making the laws clearly defined and calling out the FAA if they are imposing fines where they can't, but you are all over the place and are taking it too far.
@Sebastian: It doesn't matter if 5 pounds of styrofoam…"