Thread Tools
Apr 26, 2013, 01:32 PM
Registered User
EndOfDays's Avatar
Thread OP

129min 15s flighttime with quad

Current "high-score" 129min 15sec:
(3 min 41 sec)

Here the current "high-score" with the "budget setup" 109min 46sec
(5 min 36 sec)



I know that this is no record, but I think the result is worth posting. So I have done a lightweight frame with 12mm carbon tubes of about 700mm <100gr. This allows to go from some long flight times, since big props are possible, and the frame is rigid enough to mount some serios motors.

So here an intermediate result (it was unfortunately not calm, and also too warm)

(6 min 9 sec)

This was done using the following components:
12mm carbon tubes (1mm thichness) base frame (no standard centerplates, just build a cross and stiffened it up with CF and small CF pieces.
5010-14 motors
17x5,5 props
20A Hobbywing Esc
4S4P Panasonic NCR18650b (770gr) 13600mAh nominal LiIon
AUW 1520gr

Here a pic of the battery:

Here a video with more conventional batteries and 18x5 props (which are a bit less effective than the 17x5,5.

(6 min 23 sec)

to be continued ...

if you have some endurance results be welcome to post them here. As this is not a secret thread, it would be great also to get the details of the copter and the battery.

best regards

Last edited by EndOfDays; Jan 16, 2014 at 08:13 AM.
Sign up now
to remove ads between posts
Apr 26, 2013, 01:49 PM
MayMayDay's Avatar
Interesting. Does LiIon have better storage capabilities per unit weight? For your batteries:

13600mAh/770g = 17.67mAh/g

Compared to a Turnigy Nano-tech 4S 6000mAh

6000mAh/623g = 9.63mAh/g

What's the catch? I've don't know anything about LiIon. I'm guessing discharge rates are really low? But with that size, you don't need a really high C rating.
Apr 26, 2013, 01:54 PM
Registered User
rimshotcopter's Avatar
Amazing and Kudos!
Apr 26, 2013, 01:58 PM
RC pilot by soul

that is quite amazing ! can you please post photos of your frame ?
Apr 26, 2013, 02:07 PM
Registered User
EndOfDays's Avatar
Thread OP
The panasonic are 3400mAh nominal, and rated 2C max discharge. In other words, for a copter that is not flying more than 45min with standard batteries, it is not a good choice. The voltage (available) during flight is about 1-1.5 Volt lower than with a Lipo. They can be used until 2,5V a cell (under load), but the voltage drop at the end of the capacity is very sharp, it was less than a minute from 2,75V down to 2,5V. I also had to change the ESC to NiMh mode, since my first flight was aborted by the escs stopping at 3,15V a cell.

If you compare to a Lipo you should compare to the maxamps, as the have the best performance for this application, and the panasonic give about 10%more.

best regards

Apr 26, 2013, 02:16 PM
Registered User
EndOfDays's Avatar
Thread OP
Here a picture of the frame only:

here with motors and props:

best regards

Apr 26, 2013, 03:39 PM
MayMayDay's Avatar
Any reason why you went with 4S instead of say, 6S? Higher voltage, lower the kV of the motors. More efficient?

Either way, very impressive. When's the FPV date scheduled for?
Apr 27, 2013, 01:17 AM
Registered User
EndOfDays's Avatar
Thread OP
The Motors have 360KV, so this means at most 4S for 17" or 18" props. If you find a pancake with 250kv at about 80gr (or less), please tell me ...
What I would need are four (good - handmade) motors with 250-300kv with around 40-60gr, with them I could come close to 2h flight time then.

The rctimer motors are ok, but they are not as good (efficient) as the hobbyking NX4006 with 530KV for example.

Also the Props are good, but what I would need are two 18x10 CW and two 18x10 CCW (similar to the Graupner 14x8 but CF)

That would be my wishlist ...

I was afraid of really flying that copter (fast, in windy conditions, ...) but I think it will do the job. I am planning to add a GoPro3 or a Horizon HD with a VTX and EzTiny, that should stay below 100gr. Here a video with the quad really flying (not hovering)

(3 min 20 sec)

best regards

Apr 27, 2013, 04:00 AM
Get Airborne
End Of Days, thanks for sharing your fantastic flight duration!

My quad is just airborne for some 13 minutes, I am working on improvements.

To achieve this long flight time, I think good balancing is important, so all battery power can be used for thrust.

I shall now read your blog.
Apr 27, 2013, 11:31 AM
Registered User
excellent and congratulations .. for low kv motors how will you find the propellers ? i mean definitely it will require atleast 20-22" prop .. where can you get that ?
Apr 27, 2013, 11:33 AM
Registered User
i think you can request chinese rctimer motor manufactures for custom kv motors ..they would do it for some additional $s
May 01, 2013, 12:42 PM
Registered User
Originally Posted by EndOfDays
If you compare to a Lipo you should compare to the maxamps, as the have the best performance for this application, and the panasonic give about 10%more.
Incredible results!

Do you have any idea why they provide 'only' ( not meaning to downplay this great performance ) the 10% extra power compared to the 20% you would expect based on their specs ~ 0.20 Watts per gram vs ~ 0.25 Watts per gram). Did you notice either one of them being overrated or underrated?

Also what were the more conventional batteries used for the 73 minutes flight?
May 01, 2013, 12:46 PM
Registered User
CG Photo's Avatar
If you want a light camera you could get an 808 #16 keycam. They are only 18 grams. The video is not as good as the gopro but it is really good for the weight.
May 01, 2013, 12:48 PM
Registered User
with 4s battery , how long i can allow my copter to stay in the air ? .. in terms of voltage . i mean the maximum discharge from 4s
May 01, 2013, 01:32 PM
Registered User
EndOfDays's Avatar
Thread OP
Those were the 11000er cell from

For normal use I would stop at 14.00 Volt under load with a 4S LiPo. If you "know" your battery is ok, and the cells are matched you can go down to 13.00 Volt (but you will not gain a lot with this).
For LiIon you can go down to 11V under load, if everything is perfect (e.g. you go for a record) also 10V is possible (but again, this is only 1-2 min (from 11 to 10 Volt at the flight of 87 min).

If you use a LiPo, and it should last some more cycles, stop at 14V.

If you look for propeller you have to look around in the "standard" FPV/Copter online-shops (,, ...) If you can make propellers yourself, you are the King.

@CG Photo
I am going for a flight with camera and Video-downlink within the next weeks, if the result is reasonable I will for sure post it. Up to now, the "payload" is 115 gr, which is Horizon HD, iftrontech stinger, CL Antenna, EzTiny, and some sort of mounting underneath the copter.

best regards


Quick Reply

Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Question Anyone fly with a Hacker A10-15s and a Glavak prop? r/cmark Indoor Pattern/F3P 6 Apr 10, 2013 09:45 PM
Discussion LiPo Battery Flighttime with MultiWii Jessestr Multirotor Drone Talk 3 Jan 15, 2012 05:30 AM
Discussion Shorter flighttime with a 3s Lipo, than a 2s Lipo ? SpookiePower Batteries and Chargers 12 Oct 28, 2009 02:19 PM
Discussion E550 with 15S A123 genexis Electric Heli Talk 10 Dec 17, 2006 01:05 PM
FS: Hacker B50 15S with 1/8" shaft and MEC Superbox smsgill Aircraft - Electric - Airplanes (FS/W) 7 Sep 05, 2003 10:57 AM