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Used Drone good deal?
#1
Hey guys, I want to buy my first 5-inch drone and thought about buying a used one to save some bucks. I want to use the Drone mainly for cinematic flying. As I am not so experienced in choosing components I wondered whether you guys can give me some advice.
I found a drone with the following components.
FC: T-Motors F7 722HD
ESC: Holybro Tekko 32 F3 65A
Motor: Rcinpower Smoox 2306 1880kv
CAM: Caddx Nebula Pro HD
VTX: Caddx Vista
GPS: Ublox Sam M8Q
RX: Frsky R9mm
LED Buzzer, Cherry Antenne

My plan is to take the components and fit them in a new geprc mark 5 Frame. The price for the drone 240€. I think its a awesome price but maybe iam wrong. 
Thanks for any advice. 


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#2
Guessing you have full DJI goggles and kit already, if not add 600 euros more for a set of goggles, or you will need to change to an analog vtx and buy a set of analog goggles, which would be a lot cheaper. The rest looks ok, but if you buy it, you want a video of it flying/hovering, shot on a phone by someone, not goggles dvr. Most quads with expensive parts don't sell for that sort of price unless something is wrong with them. Unless of course this is friend of yours doing a mates rates type deal.

So if you bought it and it flew perfectly, then at the minimum you might need/want to swap the FrSky Rx for ELRS, which is pretty cheap. That's all i can really see that would need swapping out, unless you already fly on FrSky and know the limitations. If you don't have digital kit, then at the basics you need to find a second hand set of DJI goggles or if you want new, maybe buy a set of Integra. Price could be 300 to 600 euros and maybe more. Or buy analog, in which case you need a 15 euro vtx and a set of Eachine EV800D goggles for about 100 euros.
Try Not, Do or Do Not
- Yoda

[-] The following 1 user Likes Pathfinder075's post:
  • iFly4rotors
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#3
(03-Mar-2024, 10:46 PM)Pathfinder075 Wrote: Guessing you have full DJI goggles and kit already, if not add 600 euros more for a set of goggles, or you will need to change to an analog vtx and buy a set of analog goggles, which would be a lot cheaper.  The rest looks ok, but if you buy it, you want a video of it flying/hovering, shot on a phone by someone, not goggles dvr.  Most quads with expensive parts don't sell for that sort of price unless something is wrong with them.  Unless of course this is friend of yours doing a mates rates type deal.

So if you bought it and it flew perfectly, then at the minimum you might need/want to swap the FrSky Rx for ELRS, which is pretty cheap.  That's all i can really see that would need swapping out, unless you already fly on FrSky and know the limitations.  If you don't have digital kit, then at the basics you need to find a second hand set of DJI goggles or if you want new, maybe buy a set of Integra.  Price could be 300 to 600 euros and maybe more.  Or buy analog, in which case you need a 15 euro vtx and a set of Eachine EV800D goggles for about 100 euros.

Hey, thank you very much for your response. Yes I allready have a pair of Dji Goggles V2 and a controller. I would need to swap to CRSF but that shouldnt be a problem. I dont know the guys who sells this drone so requesting a video might be a great idea to make sure. Iam a bit worried about the ESC since it is a Tekko 65A F3 which had some desyc issues as stated here. New Holybro Tekko32 F3 4in1 ESC Rev C (A and B "Have Bugs") - Oscar Liang The seller is unsure on which Rev of ESC he got. Is there a simple way to find out?
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#4
An ESC is a not pricey part in the grand scheme so you could replace it with something more mainstream if you needed to. For example over here you could have the brand new Speedybee 60A 4in1 for £35 or spend a bit more and get something with probably better quality, but then as ever even things of quality are not always reliable.

A long as the thing flies, the motors and video are ok, the FC and 4in1 work for the most part and you have a video of the quad hovering you are probably good.

I can only speak from general experience, beyond that. My own experience is in micros. But like most people in this hobby i watch a lot of stuff and read a lot of info, plus have a few boxes of parts for the 4-5 builds I will one day complete. Wink
Try Not, Do or Do Not
- Yoda

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#5
it will be a gamble, to get the best value fpr money a used quad can be a rabithole...
i wish you luck if you get it, i would also consider pnps - double in price maybe but there is way less risk to stay on the ground. gambeling or not?

soldering doesnt look shiny up to terrible Undecided next to that it looks well builded overall.
personal, after short testing, i would solder freshly befor liftoff the second time on that quad xD
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#6
(03-Mar-2024, 11:04 PM)Fpv_Snidde Wrote: Iam a bit worried about the ESC since it is a Tekko 65A F3 which had some desyc issues as stated here. New Holybro Tekko32 F3 4in1 ESC Rev C (A and B "Have Bugs") - Oscar Liang The seller is unsure on which Rev of ESC he got. Is there a simple way to find out?

A lot of the information about the Holybro Tekko32 F3 ESC boards on Oscar's blog was taken from the forum thread linked to below and made into a really nice easy-to-read article.

Unfortunately I wasn't sensible enough to take copies of the images of the ESCs from the Holybro website so those images at the bottom of the post are now just broken links. However, the key thing to look out for is the presence of a daughter board on the main board of the ESC which is a separate raised board that contains all of the control electronics so they are separated and shielded from the high current running through the traces on main ESC board. If the ESC board in the quad you are buying has one of those on it then it's a revision "C" ESC and doesn't suffer from any of the bugs mentioned in the thread below or Oscars article.

https://intofpv.com/t-warning-holybro-te...ware-issue

I'm running a revision "C" Holybro Tekko32 F3 65A Metal ESC in one of my quads and I've never had any issues with it.

Below are photos taken from Oscars blog article showing the raised daughterboard mounted on the mainboard of the revision "C" ESCs...
[Image: xrDyMwGl.jpeg]

[Image: 9bXD4Xcl.jpeg]
[-] The following 2 users Like SnowLeopardFPV's post:
  • iFly4rotors, Fpv_Snidde
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#7
(06-Mar-2024, 11:41 AM)SnowLeopardFPV Wrote: A lot of the information about the Holybro Tekko32 F3 ESC boards on Oscar's blog was taken from the forum thread linked to below and made into a really nice easy-to-read article.

Unfortunately I wasn't sensible enough to take copies of the images of the ESCs from the Holybro website so those images at the bottom of the post are now just broken links. However, the key thing to look out for is the presence of a daughter board on the main board of the ESC which is a separate raised board that contains all of the control electronics so they are separated and shielded from the high current running through the traces on main ESC board. If the ESC board in the quad you are buying has one of those on it then it's a revision "C" ESC and doesn't suffer from any of the bugs mentioned in the thread below or Oscars article.

https://intofpv.com/t-warning-holybro-te...ware-issue

I'm running a revision "C" Holybro Tekko32 F3 65A Metal ESC in one of my quads and I've never had any issues with it.

Below are photos taken from Oscars blog article showing the raised daughterboard mounted on the mainboard of the revision "C" ESCs...
[Image: xrDyMwGl.jpeg]

[Image: 9bXD4Xcl.jpeg]


Thank you very much for all the information. 
The seller stated that his ESC doesnt have this daughter board. So i would be best to swap the esc to a different one.
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#8
Hi Fpv_Snidde,

First, I am always a bit leery of buying used gear. Why is it being sold?
Is there something wrong with it? If you are just getting the quad, 
then what other gear is he selling or not? Why? 

When contemplating used gear, you never really know what you are
actually getting. For instance, suppose you do buy this and when it
arrives, it is not what was pictured. Hmm. Now what? Or you discover
that some of the things don't work. Hmm. Again? You will just have to 
live with it as you likely will not get your money back. I know, people
are always honest. Right? 

How does the price compare to a brand new BNF quad that has all
new parts and perhaps a warranty or guarantee. 

As for the value, I would add up the cost of each component except
the frame and the R9 receiver then divide that in half (50 percent). 
I would not include the frame nor the receiver since those have no
value to you as you will be using a new frame and receiver anyway.
I wouldn't buy used gear that I don't need. 
 
So, 50% of the usable gear would be the absolute TOP dollar that 
I would pay. 


Later, iFly   High Five
______________________________________
My BUILDS  ||   My INDEX   ||  Parts Guide  <-- Download


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