How to fly longer with a drone?

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Usually, modern FPV drones do not fly very long. A few minutes. Shorter for racing, slightly longer for freestyle. Luckily, there are a few things you can do to make them fly longer and further away.
You might be surprised, but putting a bigger battery is not really the best solution at all. Bigger batteries hold bigger charge, but are also heavier. This increases the drone’s weight and bumps energy consumption.
The best ways to fly longer are: be gentle when using throttle and make your drone lighter. Drop all the dead weight.
Only then you can consider putting a bigger battery. Li-Ion probably. Li-Ion packs made from 18650 or 22700 cells have almost double energy density compared to LiPo packs. And that counts!
How to solder Li Ion cells • How to solder 18650 Li...
0:00 Drones fly too short
0:28 Be gentle
0:58 Loose some weight
1:49 Keep batteries warm
2:44 Keep it smooth
3:38 Bigger batteries
4:21 Replace LiPo with Li-Ion batteries
5:34 What is flight record?
#fpvuniversity #fpv #drones

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28 май 2024

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Комментарии : 60

@madladdan 5 месяцев назад

When you've been in the hobby a couple years and pretty much know all the tricks but you still enjoy watching Pawel Spychalski.

@thirtythreeeyes8624 5 месяцев назад

Another tip is size up, the bigger the prop the more efficient. I've went 42 minutes on an ultralight 9" with a 400gram camera/gimbal onboard and have a 13" in the works that should get to an hour or more depending on camera setup.

@scottyh72 5 месяцев назад

Bigger props are only more efficient if you keep rpm down. Want to bring the speed? Go smaller on the prop. Tip speed goes up fast, and drag goes up exponentially with speed.

@senseisecurityschool9337 5 месяцев назад

@@scottyh72 Yes the drag goes up with the square of tip speed. BUT so does the amount of air moved - the area of the prop disc is π r². *In addition*, as the prop moves faster through the air, it moves the air backwards faster. Thrust = mass flow rate * delta V. Increasing the diameter of the prop means that for the same RPM you both increase the mass flow by square of the radius, and also have higher delta V. Larger props will always be more efficient for the same amount of thrust. In fact, the power coefficient is inversely proportional to the diameter to the FIFTH power. Yeah, D⁵! Yes, drag is D². Thrust coefficient is D⁴. Power coefficient is D⁵. Yes, these are all exponents. But there's a big difference between 10² and 10⁵ ! 10² (proportional drag) is 100. 10⁴ (thrust coefficient) is 10,000!

@senseisecurityschool9337 5 месяцев назад

Ps - Drag does not go up exponentially with speed. Not nearly. Not anymore than your age increases exponentially with your age. :) "Drag goes up exponentially with speed" would mean drag = x ^ velocity So an example of "exponentially with y" would be: d = 14ʸ. I think you meant it increases *quadratically* with speed. Proportional to v². Not 2ᵛ. Normally getting this right might not matter, but in this case it makes all the difference in the world. Aircraft would be designed entirely differently, and probably couldn't exist at all, if drag were *exponential* to velocity. Since it's only quadratic, not exponential, flight is possible. What if we did redefine math to start calling any formula with an exponent in it "exponential"? Well then your current age is: Age = Age¹ That has an exponent, so we would say "your age increases exponentially with your age". 😃

@thirtythreeeyes8624 5 месяцев назад

@@senseisecurityschool9337 Thanks for breaking down the math on it, all my caveman brain knows is, big prop fly long haha disc loading is also usually a lot better and unlike most people I really like floaty rigs.

@scottyh72 5 месяцев назад

@senseisecurityschool9337 of course a bigger prop moves more air. But if you are moving more than needed for the required speed, you lose efficiency. Airplanes need pitch speed more than static thrust. I'm also aware that in flight props unload, creating more thrust. That's why I run smaller props with more pitch. More speed with less power. I can do 150mph on 1kw.

@AerialWaviator 5 месяцев назад

Good basic info to fling longer, or farther. Regarding vibrations, that's energy that's not going into thrust. So balancing propellers, and motors and making sure everything is secure (not loose) will save energy. Balancing propeller size and propeller pitch to motor size can reduce current. ie: if motors are running warm, they're wasting energy. Another tip is to use higher voltage batteries, as it reduces current needed to operate motors, and because heat from resistance is a factor of I^2*R less energy goes into heat. Using higher S (6S vs 3S, or 4S) is easier done on larger drones, as the extra cell or two is a smaller percentage of total weight. Finally, analog video tends to be less power hungry than digital video. (digital VTX's tend to run hot) Like everything it's a tradeoff, it flight time more important than video, then ... ;)

@wearemany73 5 месяцев назад

Merry Christmas Pawel, keep warm and well, I hope you’re feeling better for the drinking and partying. 😊👋🇬🇧🎅🎉🎄❤️🎂

@mazepa2341 5 месяцев назад

Good advice Paweł😀 Flywoo explorer 4" WS PRO kit got 11-15min from 850mAh 4S, on 18650 4S didnt get to an end😅 Baby Ape II 3,5" analog got 5-11min from 850mAh 4S lipo battery. Both drones weigh approximately 250g with battery.

@vasobg12 5 месяцев назад

Flywoo Explorer lr 4 gets easy 10 min flight out of 4s 850mah lipo in the summer. With 4s 18650 diy 3000mah pack 25+ mins. Really love this drone.

@jaysonrees738 5 месяцев назад

I've pulled some pretty good distance before. Of course the big limiter right now is video link range. Hoping ELRS eventually outputs basic telemetry for an antenna tracker so I can put some super high gain helicals on. Currently working with some fancy patches, but I need more! Thanks for all your hard work to make iNav great!

@FPVUniversity 5 месяцев назад

Thanks for sharing!

@thirtythreeeyes8624 5 месяцев назад

I believe there are already trackers out there that support CRSF or there is currently a mavlink version of ELRS in beta.

@jaysonrees738 5 месяцев назад

@@thirtythreeeyes8624 If I'm not mistaken, the full Mavlink connection will require a specially flashed transmitter for high end telemetry. But hey, I'll wait and see.

@MCsCreations 5 месяцев назад

Thanks for all the tips, Pawel! 😊 Stay safe there with your family! 🖖😊 And happy holidays!

@h2o40fpv 5 месяцев назад

Great tips thank you so much😊.

@FPVUniversity 5 месяцев назад

my pleasure

@b3owu1f 5 месяцев назад

"does it work.. ah hah." haha.. that was great!

@FPVUniversity 5 месяцев назад

Glad you enjoyed it!

@henrirotthier5710 5 месяцев назад

As you mentioned, bigger batteries are not always better. They are also much more expensive. I fly mostly with 450mah 4s, bought for a steal from Hobbyking when they shut down the European store. Gives me 6 to 7 minutes of flight time on a lightweight 4 inch LR4 frame with 1404 motors and 4inch props. And I'm not tender with the throttle. I have enough of them to fly for a couple of years 😁

@thompaulson5152 5 месяцев назад

10min on a baby ape bi blade with a 1100mah 3s 60c light flips and rolls, 8min on TBS source micro 2.5 850mah 90c I think 1103 8000kv motors flipping all day

@Sonic_Ox 5 месяцев назад

GREAT information as usual Pawel. Thank you for producing such informative, interesting, and entertaining content. Thank you also for all your hard work on INAV. I recently completed my first DIY build. It's a 7" and I consulted your various videos all along the way. I'm using a 4000mAh li-ion 21700 6s pack for the longest flight times. I can get over 20 minutes if I employ your suggestions and strategies from this video. I'm sure I could go longer if I cut more weight and I do intend to buy a lighter action camera but I am sort of in the sweet spot as far as weight versus battery type etc. I'm not really interested in flippity floppity so li-ion packs work great for me. 30 minute flights are a good goal to chase for me but I'm very happy with 20 mins at the moment. I hope you and yours have a Merry Christmas and a wonderful new year Pawel. Happy flying amigo.

@FPVUniversity 5 месяцев назад

I'm very happy you like it. Keep on flying

@Sergei75000 5 месяцев назад

I used old frame zmr 250 with 1806 size motor with triblade 5" and 4s 21700 liion pack battery (4000mah ) for 15 mns flight time

@dimonik12 5 месяцев назад

5 min cruising on my Flylens 85 with a 2S660GNB, I reckon it could do a bit more if their was a target available for INAV 7 though... 😋 Flywoo F405S_AIO

@dezelvol 5 месяцев назад

My recent observation - the closer you are to max throttle while cruising, the longer you'll fly. For example, I made some very unscientific experiment on 2" whoop. With 22k 1003 motors it was consuming 17amps floating on low throttle, while 13.5k 1102 flew on 77% throttle on full battery, but used just 8.5amps. Everything except motors was the same. Also tried 120g 2.5" with 1404 6k on 2s and 3s. On 2s it was hovering on high throttle with 17amps, but just going 3s made it much less efficient hovering on 23amps. So, in watts, it has been using twice more power just to stay in the air. My assumption is that as any electric motors are not good with throttling, brushless are not exception, and less throttle you are using - less efficiency you have. So it's better to use as small and low KV motor as you can, and you can prolong fly time a lot. Also, going with bigger two blade prop, with lowest possible pitch, should add time. Especially, with appropriate motor.

@thirtythreeeyes8624 5 месяцев назад

Brushless motors are generally most efficient around 60% of their maximum power dropping down significantly the closer you get to maximum so running something on 2s that would normally be 3s means you're running right in that efficiency window towards full throttle. There is also as you suspect an efficiency lost by running at lower throttle because of losses from the way the esc works.

@dezelvol 5 месяцев назад

@@thirtythreeeyes8624 please, share, where you found about 60%. Most of testing results that I've found on internet, such as SiieeFPV, says that more rpm you use, more efficient you get. 60% is, probably, taking prop into account as propeller gets less efficient with RPMs. So when you test single motor+propeller efficiency, indeed, it would be best near 60%, but if you can get less kv motor, efficiency for same thrust requirement, will be better.

@CapnBry 5 месяцев назад

Nailed it with the thumbnail! 😆-> FAR

@FPVUniversity 5 месяцев назад

@jakub.medek42 5 месяцев назад

I managed around 23km and 25min round trip with custom build aos7 (tmotor stack + f90 1300kv) and molicel p42a 6s2p, 8400mah total capacity. Not great, I've seen people get 30km/30min at least with the same battery setup, so I'm not sure what I'm doing wrong... I might have messed up the motors during pid tuning, because I didn't check the temp after each flight and stopped only when I smelled something (motor coils getting too hot, not burning, but too hot) and burned myself on the motor - coils are fine, but magnets might have been partially demagnetized. Btw this record was my first flight with that battery setup on almost stock inav 7. Cruise behaved very weird, it was jumping on pitch and was also heavily rolled (to be fair, it was windy, but I had to fly the test in acro, since it was by far the most stable mode).

@thirtythreeeyes8624 5 месяцев назад

Windy conditions and non perfect tunes will effect flight time, there's also other factors like cg not being centered and I've even heard you should condition the batteries by charging and discharging at a low c a few times before actually using but, I'm not sure how big of a deal that one is.

@shotbyarian 5 месяцев назад

"the link is in the description" (welding) .. no link?

@FPVUniversity 5 месяцев назад

my bad ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-1UqwhsAVoMQ.html

@Mindauxx 5 месяцев назад

Happymodel Crux 3.5inch 4s 850mah - 21 min

@Kostyankomunyaka 5 месяцев назад

Once, I remember, I was flying from the third floor down, and fell on a cherry tree, the flight was about 2 seconds, im 80 kg) ahaha

@lasersbee 5 месяцев назад

5:17.. Acid Flux is a Definite No-No for Electrical connections. It is used for Sheetmetal soldering only. Over time the current flowing through the Acid Joint will corrode.

@FPVUniversity 5 месяцев назад

It is yes-yes if you rinse and clean it properly. I have 5 years old LiIon pack soldered with soldeing acid and it's working perfectly well, no corrosion