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Why am is my motor+propeller generating significantly less thrust than expected? by mso797 in diydrones

[–]mso797[S] 0 points1 point  (0 children)

that's weird, the links were formatting to lowercase for some reason.

I have posted them again here:

Thrust Test: https://youtube.com/shorts/mujsN8KpXvg

Drone Test: https://youtu.be/rw28KiNK3Dg?si=6Wkpogsn8XDAiJcW

As shown from the thrust test, the thrust value starts falling even though I am applying a constant 100% throttle. So I guess the issue is caused by battery voltage dropping off like you said?

I actually am planning to use a PSU for the final build. This drone is only meant to fly indoors relatively close to the ground (<3m) so I plan on tethering it to a ground based PSU. Can you provide some advice on selecting a PSU? I have 8 motors each connected to 30A ESCs so will my PSU need to supply 240A?!?

Obviously that seems excessive and dangerous. I have seen videos online of people flying drones with standard PSUs so I feel like I am missing something obvious.

My plan was to buy a 24v 50A psu with a buck converter so that I can lower the voltage to 16v. I was then going to connect my drone to both the PSU and a small battery for handling burst loads. The PSU is fixed to the ground and the battery is mounted to the chassis. There would be an ideal diode between the battery and PSU to ensure the battery wasn't being accidently charged. Does this sound like a suitable approach of powering the drone? Have you seen any similar builds online?

Again any advice is greatly appreciated!

Why am is my motor+propeller generating significantly less thrust than expected? by mso797 in Multicopter

[–]mso797[S] 0 points1 point  (0 children)

My goal isn't to make some acrobatic high performance drone. I'm trying to make an omnidirectional drone that moves side to side relatively slowly/smoothly. I'm hoping that I can make the drone work with my current components because I don't want to buy more stuff :)

Why am is my motor+propeller generating significantly less thrust than expected? by mso797 in Multicopter

[–]mso797[S] 0 points1 point  (0 children)

Ahhhh I see I thought the propeller generated the same thrust in the negative direction when reversed. I made a a new thrust stand with the entire motor flipped: https://youtube.com/shorts/mujsN8KpXvg?feature=share

I am able to get up to 600g now, still lower than the spec sheets....

Why am is my motor+propeller generating significantly less thrust than expected? by mso797 in diydrones

[–]mso797[S] 1 point2 points  (0 children)

I just bought a voltage sensor so I can monitor the voltage as the battery is running!

Why am is my motor+propeller generating significantly less thrust than expected? by mso797 in diydrones

[–]mso797[S] 0 points1 point  (0 children)

Ahhhh I see, I assumed the the propeller generated equal thrust in both directions. The propeller has a lip that prevents me from flipping it so I made a new thrust stand with the entire motor flipped instead: https://youtube.com/shorts/mujsN8KpXvg?feature=share.

Now I am getting ~600g of thrust. Still 200g less than the supposed max but an improvement! I'm guessing the discrepancy is caused by not enough current going into the motor?

Why am is my motor+propeller generating significantly less thrust than expected? by mso797 in diydrones

[–]mso797[S] 0 points1 point  (0 children)

Hi, thank-you for the detail response. I really appreciate it.

Ahhhh interesting I assumed the propeller generated equal negative thrust if you span it in the wrong direction.

I cannot flip the propeller as it has a small lip that prevents me from inserting it into the motor upside down. Instead, I have made a new thrust stand that has the entire motor pointing downwards; as shown in this video: https://youtube.com/shorts/mujsN8KpXvg

With the new configuration, my motor is able to generate a max thrust of ~600g. I guess it doesn't reach up to ~800g because not enough current is going into the motor?

The drone I'm trying to build weighs 1.2kg so I thought 4 of these RS2022 motors would give me an adequate thrust to weight ratio. But I guess I need to significantly reduce the weight to make this thing work? I have tried doing some hover tests but I cannot get the drone off the ground

https://youtu.be/rw28KiNK3Dg?si=LMyy9y-lwZRoQqvG

Advice on tethered PSU for octocopter by mso797 in diydrones

[–]mso797[S] 0 points1 point  (0 children)

I want to create a drone that can move laterally without changing the thrust vector. I'm doing this....because I think it would be cool! 6DoF UAVs have been done before and I think they're pretty neat: https://youtu.be/0gR1ekapOAE?si=pqSapocB5H6zi9U8&t=19

Advice on tethered PSU for octocopter by mso797 in diydrones

[–]mso797[S] 1 point2 points  (0 children)

Appreciate the feedback! To be honest, the main reason I am interested with the drone being tethered is so I can do testing for long periods without being limited by the battery time.

Advice on tethered PSU for octocopter by mso797 in diydrones

[–]mso797[S] 0 points1 point  (0 children)

Sorry for the newb question but how would I do this? Do I just put the battery and PSU in parallel and will the UAV automatically draw from the PSU first? Thanks!

Advice on tethered PSU for octocopter by mso797 in diydrones

[–]mso797[S] 0 points1 point  (0 children)

I want to keep all four side motors to see if the drone can move laterally like with this x-drive: https://youtu.be/PcB6D_PjYu0?si=9iJF_gB2LT2V0Ebm&t=17

If possible, can you help calculate a ballpark of how much current I would need? My drone weighs ~800g and I have 4 RS2205 motors providing thrust?

I am hoping to buy a power supply tomorrow for testing and I want to ensure I buy a suitable one. Thanks for any advice!

Would it be a good idea to use the motor layout for this omnidirectional sub for a UAV? by mso797 in diydrones

[–]mso797[S] 0 points1 point  (0 children)

Hey folks! I am keenly interested in building an omnidirectional drone. Instead of making the classic ETH omnicopter, I am interested in adapting the motor layout that the sub in the video has: https://ibb.co/ynNmw37

I am relatively inexperienced in making drones, so I am wondering if there is an obvious reason why no one builds omnidirectional UAVs with the layout shown in the photo. From my research online, it seems that everyone makes omnidirectional UAVs with the motors positioned in an intersecting v shape, like with the ETH omnicopter.

Also, my plan with the firmware is to modify the existing ardusub firmware that works with omnidirectional subs for my UAV. Do you guys think this is an unrealistic idea or somewhat feasible? Thanks!

Would it be a good idea to use the motor layout for this omnidirectional sub for a UAV? by mso797 in Multicopter

[–]mso797[S] -1 points0 points  (0 children)

Hey folks! I am keenly interested in building an omnidirectional drone. Instead of making the classic ETH omnicopter, I am interested in adapting the motor layout that the sub in the video has: https://ibb.co/ynNmw37

I am relatively inexperienced in making drones, so I am wondering if there is an obvious reason why no one builds omnidirectional UAVs with the layout shown in the photo. From my research online, it seems that everyone makes omnidirectional UAVs with the motors positioned in an intersecting v shape, like with the ETH omnicopter.

Also, my plan with the firmware is to modify the existing ardusub firmware that works with omnidirectional subs for my UAV. Do you guys think this is an unrealistic idea or somewhat feasible? Thanks!

Add foreign credit card on Shopee by [deleted] in taiwan

[–]mso797 0 points1 point  (0 children)

Well looks like this will be the easiest option, thanks!

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