Motor overload warning --- impending crash ??

[Jiggly-Wiggly]

I bought the drop device from UBuyWeRush and it works well. However, after about 8 or 9 minutes of flight I've been getting the dreaded "Motor Overloaded" warning when I try to lift a heavy payload around 2 lbs. I realize this payload is putting a lot of stress on the two rear motors since that's where the drop device is mounted to the rear struts of the landing gear.

Does this overload warning mean the motors will suddenly shut off when the P3P is in flight? Or does it mean the aircraft will do a slow controlled descent and land?

Obviously, I prefer the slow descent versus the automatic shutoff --- but I dont wanna find out the answer the hard way. Anyone know for sure?

 

[Fly Dawg]

The weight of the Aircraft itself is only around 2lbs. That is far, far too much for it to handle without damage. The maximum weight of any payload should never exceed the weight of the aircraft itself, unless such aircraft were designed for that purpose. You are looking at impending disaster.

 

[Phill2]

The weight of the Aircraft itself is only around 2lbs. That is far, far too much for it to handle without damage. The maximum weight of any payload should never exceed the weight of the aircraft itself, unless such aircraft were designed for that purpose. You are looking at impending disaster.

Also lifting that much is putting a lot of stress on your motor mount screws.
Id be checking for stress cracks.

 

[With The Birds]

The motor overload in flight can be largely mitigated by backing off the thrust in most circumstances. Forcing the AC to carry a heavy load there is no chance of reducing thrust, the AC is working way above its designed thrust just to maintain a hover.

2lb is very ambitious as a payload. The analogy would be to tow a 3 ton unbraked trailer with a Hyundai. It might do it but only at the almost certain risk of mechanical failure.

You need a bigger AC.

 

[Jiggly-Wiggly]

The weight of the Aircraft itself is only around 2lbs. That is far, far too much for it to handle without damage. The maximum weight of any payload should never exceed the weight of the aircraft itself, unless such aircraft were designed for that purpose. You are looking at impending disaster.

2 lbs. is probably the max. payload capacity --- I normally only haul payloads under 12 oz. and I never get the overload warning when I do that

 

[Jiggly-Wiggly]

2lb is very ambitious as a payload. The analogy would be to tow a 3 ton unbraked trailer with a Hyundai. It might do it but only at the almost certain risk of mechanical failure.

I've only hauled a 2 lb. load twice and it gave me the overload warning both times. So I wont get keep pushing my luck. I was just curious what happened if I kept flying during the overload warning --- sudden plummet or slow controlled descent.

 

[Pharm]

All the comments about the load possibly being too heavy notwithstanding, my concern would be the balance. It would logically seem a better choice, with that heavy of a payload, to have the weight centrally balanced, thereby distributing the increased load/stress to all four motors! Is the drop device designed to be mounted that way?

 

[Steve7777]

Someone has always done it before...

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I have no supporting technical evidence but my guess would be a sudden plummet. Something will fail sooner or later....

 

[Jiggly-Wiggly]

All the comments about the load possibly being too heavy notwithstanding, my concern would be the balance. It would logically seem a better choice, with that heavy of a payload, to have the weight centrally balanced, thereby distributing the increased load/stress to all four motors! Is the drop device designed to be mounted that way?

That is the big drawback of the drop device --- it has to be mounted on the rear legs of the landing gear --- and thus it causes the two rear motors to spin faster to compensate for the weight of the payload which is shifted towards the rear, although in reality during flight the payload will swing like a pendulum under the Phantom because of normal momentum changes. But even swinging like a pendulum, the payload is always stressing the two rear motors the most since that is the pivot point.

Someone could design a drop device that could mount centrally under the camera --- but this would necessitate some type of landing gear risers to accommodate the size of the drop device.

 

[BigAl07]

When you see that warning you're getting really close to a system wide reduction in power (to preserve battery/ECS integrity) and if it continues you might see a total propulsion system shutdown.

Someone could design a drop device that could mount centrally under the camera --- but this would necessitate some type of landing gear risers to accommodate the size of the drop device.

https://dronefishing.com/store/

 

[Pharm]

That is the big drawback of the drop device --- it has to be mounted on the rear legs of the landing gear --- and thus it causes the two rear motors to spin faster to compensate for the weight of the payload which is shifted towards the rear, although in reality during flight the payload will swing like a pendulum under the Phantom because of normal momentum changes. But even swinging like a pendulum, the payload is always stressing the two rear motors the most since that is the pivot point.

Someone could design a drop device that could mount centrally under the camera --- but this would necessitate some type of landing gear risers to accommodate the size of the drop device.

Seems like a better design is definitely in order.

I also noticed the device has a big "DJI" on it, indicating it's either made by DJI or licensed by them. If it's neither, I sure wouldn't want to be on the wrong end of THAT lawsuit. Big companies have a lot more money to pay attorneys than I do !

 

[Jiggly-Wiggly]

I also noticed the device has a big "DJI" on it, indicating it's either made by DJI or licensed by them. If it's neither, I sure wouldn't want to be on the wrong end of THAT lawsuit. Big companies have a lot more money to pay attorneys than I do !

I have no idea why they 3D printed the DJI logo on their product. They also need to come up with a better company name than "UBuyWeRush".

 

[Pharm]

I have no idea why they 3D printed the DJI logo on their product. They also need to come up with a better company name than "UBuyWeRush".

Maybe it's "We rush before DJI catches us using their logo".