Multirotor, multicopter and quadcopter discussion - The Drone thread

booyaka said:
let me know if/when you get them as I might order them for £20
Click to expand...

Will let you know, going to see what else is about for my price range.


Seen a lot of other cheaper 450 kits about, and 550's

Are they any good for the lower price? Ie ESC and motor wise? Ie do they do the job?
 
My q450 was like a tenner or something from hobbyking. It's a dji450 copy, has survived hitting the ground from about 100 feet up when it dropped out the sky and is still in one piece.
 
I've just fitted very similar ones, quality looks ok, though not tried them out properly yet. Simply screw to the bottom of the 450 base plate.
 
Cool. For 17 i may give it a pop for the landing skids




booyaka said:
My q450 was like a tenner or something from hobbyking. It's a dji450 copy, has survived hitting the ground from about 100 feet up when it dropped out the sky and is still in one piece.
Click to expand...

I may build a cheaper version in a few months, just as a spare run around if you like. No idea on escs or motor quality which ones to go for but yeah I see the £10 kit on hobbyking

Something is telling me to build something different though
 
Last edited:
When I'm looking to get different motors that'll need a beefier ESC (the F550 only has 15A ESCs) I've checked other ESCs and they are often listed as having a BEC or not - do the DJI E300 ESCs have a BEC in them and would I need to get new ESCs with or without a BEC?

Confused >.<
 
How would I find out? Is it visual? No info on the web?

Looking online it could be no internal bec

Don't even know what that is, all new to me too lol
 
I think the DJI ones are non BEC as they are the OPTO type but just wanted some confirmation - am also looking elsewhere but figured one of you kind gents would likely know off hand!

EDIT - think I've got it now - if I'm understanding things correctly I wouldn't need a BEC enabled ESC as my controller (Naza) takes it's power from the battery directly - might look at a SimonK 45A non BEC ESC in which case (found them on offer at £24.95).
 
Last edited:
In an electric-powered radio controlled model, the BEC is typically part of the electronic speed control (ESC). BEC allows such a model to carry only one battery (the motive power battery) instead of two (motive power, and a separate battery to operate the R/C equipment). A BEC-equipped ESC meant for airplane use often incorporates a low-voltage-cutoff (LVC) circuit which can sense the voltage drop caused when the battery has little charge left in it. It then cuts the power to the 'drive' motor in order to provide the 'steering' servo(s) with enough power to be able to bring the model safely back to the operator. The power to the propeller would be cut but the operation of the control surfaces would be maintained in order to perform a dead-stick landing. Without this feature, all control would be lost when the battery expired, probably resulting in the destruction of the model. In some cases, the BEC is part of the radio control receiver, instead of being part of the ESC.

R/C BECs in their simplest form use a linear fixed voltage regulator with its standard circuit suggested in the manufacturer's datasheet – usually the power supply of the receiver needs 5 V. Low-drop types are preferred – especially for batteries with only a few cells. For small models, 1.5 to 2 A are enough; for mid-size models a 3 A type needs to be considered. BECs for large models have to provide current of 5 A or more. There a more complicated switched-mode regulator should be used, as the BEC has to deal with losses. These losses are proportional to the difference of the target voltage of 5 volts and the voltage of the main battery; as well as they are proportional to the provided current. For example, take a 10-cell (NiMh) accumulator with a normal voltage of 12 volts. With a peak current of 5 A, the BEC will have losses of (12 V − 5 V) × 5 A = 35 W. With a linear regulator, these 35 W will be converted to heat and so require a large heat sink. In all cases, it is a good idea to mount some large capacitors to buffer the regulated output. In large plane or ship models, another possibility is to buffer the power supply with a further capacitor near the actuator's (servos).
Click to expand...
 
TheOtherOption said:
I think the DJI ones are non BEC as they are the OPTO type but just wanted some confirmation - am also looking elsewhere but figured one of you kind gents would likely know off hand!

EDIT - think I've got it now - if I'm understanding things correctly I wouldn't need a BEC enabled ESC as my controller (Naza) takes it's power from the battery directly - might look at a SimonK 45A non BEC ESC in which case (found them on offer at £24.95).
Click to expand...

You will need some pretty chunky motors to warrant 45a ESC's. Have a look at the motors max draw with the props you want to use. You could probably get away with less, especially on an octo that can only run smallish props.

Save weight and money!
 
Took mine out for its official 3rd flight yesterday still haven't taken it up very high but thank god for return to launch feature as accidentally flew it into the sun and was unable to see it set it to rtl and managed to save it
 
TheOtherOption said:
Hi Gandhi - I've got the extended arms for my F550 so can run up to 12" props.

Was looking at something like the T-Motor MN3110 780kV motors with 11" or 12" props.
Click to expand...

30a esc's should be plenty then. According to the motor specs they're rated for 26a max and looking at the charts, that would probably be for 6s. What batteries you gonna use and how much lift do you need?
 
Flukester said:
Yeah I have Aeroxcraft but they are pretty heavy.... those ones in your link look pretty neat. So many designs out there
Click to expand...

Are they a "considerable weight?" My 550 feels heavy enough at moment & i've only got a 3S 4000mAh battery on it. Looking at a decent 4S battery at moment. Want to be able to hang a go-pro & possibly FPV gear on it.
 
Brutal biff said:
Took mine out for its official 3rd flight yesterday still haven't taken it up very high but thank god for return to launch feature as accidentally flew it into the sun and was unable to see it set it to rtl and managed to save it
Click to expand...

Iv done that before, but I didnt use the RTH feature, I held my radio up and blocked out the sun whilst I flew it out of the sun :o:p


Looking to do some flying this weekend with the DJI F450


Also thinking of building a Q450 for some more daring movings, a bit of a fling around and test, bits seem to be cheap, although not sure if I should build the 550 version out of some of them parts, or something different.



Also can anyone reccomend a prop update for my DJI F450, I am mainly a steady and high flyer, but do like to have the odd quick menovour, at the moment I have been using stock DJI 9443 Props (both from the DJI F450 and the phantom *white one with red lines on tips*)


I am looking for something with good feedback and response, but more importantly something that will be more durable
 
Last edited:
gandhi said:
30a esc's should be plenty then. According to the motor specs they're rated for 26a max and looking at the charts, that would probably be for 6s. What batteries you gonna use and how much lift do you need?
Click to expand...

The batteries I have are 3S 8400mAh Nano-Techs - the details for the MN3110 say:
Use on 3s with the 12"x4" CF prop or on 4s with 11"x3.7
Click to expand...

So I'm sure mine will work with those motors. I take it having higher amp ESCs shouldn't be a problem if the motors only max out at 26A?
 
This weekend is the first free weekend I've had for months so I was looking forward to getting my first FPV flights on. But my compitent observer is buggering off so I can't :(
 
Shoei said:
Are they a "considerable weight?" My 550 feels heavy enough at moment & i've only got a 3S 4000mAh battery on it. Looking at a decent 4S battery at moment. Want to be able to hang a go-pro & possibly FPV gear on it.
Click to expand...

My 550 is fully loaded fpv / gopro / gimbal / flytrex 3g and with two batts she is tipping in just over 2.8KG.

As long as it's not too windy flys great, and when windy I drop to a single battery.

The best bit about the Aeroxcraft is the gimbal / gopro can come right forward counterbalanced by battery... this means less chance of props getting in way of footage.
 
You must log in or register to reply here.
Back
Top Bottom