Posts: 164 Threads: 10 Likes Received: 95 in 71 posts Likes Given: 172 Joined: Dec 2020 Reputation: 4 13-Jan-2021, 02:06 AM (This post was last modified: 07-Mar-2021, 02:36 AM by Joshua_A.) I’m been working on a 20km long range quad (10 there and back!!). If that’s not crazy enough, I have a few objectives I will also try to achieve: 1. 30+ minute flight time (as of 1-29, I’ll be shooting for +60 minutes) 2. 5/1 thrust/wight ratio (or more!!) 3. Sub 250g As a few of you may know, I’ve been goofing around with a few equations to find the most efficient setup, with a good thrust/weight ratio. Hence the term “ LEAP” ( Long Endurance And Power). This build was solely for testing my initial thinking, although I’m now addicted to LR.  The components I’m using (as of the writing): Frame: Betafpv X-knight 4” (with a few modifications) AIO: Hifionrc f7 (due to the 7 volt cutoff I’ll be using a 32bit AIO with programmable Low Voltage Cutoff.) moving to a 32bit esc is unverified, although I found that this works fine. Motors: Flywoo nin 1404 Cells: Samsung T40 (2x) Camera: Caddx ant Vtx: IRC tramp nano (I’ll be running 1.3ghz later...) I’ll be posting more about this build later...  Posts: 1,506 Threads: 49 Likes Received: 714 in 525 posts Likes Given: 478 Joined: Oct 2020 Reputation: 93 13-Jan-2021, 03:18 AM (This post was last modified: 13-Jan-2021, 04:30 AM by V-22.) Wow, that's an impressive goal! I think it's all possible except for the 20km range at this point. 4000mAh just isn't enough juice to get you that far unless you go fixed wing. With those components, you can probably get close to 85g dry weight. Assuming NIN 1404-4850s spinning efficient 4" props, with a 2S 40T pack you could get better than 40 mins of hover time and a 9+km range: ![[Image: tZLdZFfl.png]](https://i.imgur.com/tZLdZFfl.png) Going with the lighter VTC6 18650s you'd bump up your hover time and thrust to weight ratio, while still maintaining the 9km range. ![[Image: uBfnU8ll.png]](https://i.imgur.com/uBfnU8ll.png) And for performance you could switch to a GNB 3S 1100mAh LiPo to get a 8:1 thrust to weight ratio along with a decent flight time: ![[Image: mCypd0tl.png]](https://i.imgur.com/mCypd0tl.png) And if you managed to wire two of those GNB 3S packs in parallel and fit them on the frame, you could hit the trifecta of >5:1 thrust to weight, >30 min hover, and <250g AUW: ![[Image: 4ZWEvEhl.png]](https://i.imgur.com/4ZWEvEhl.png) Posts: 164 Threads: 10 Likes Received: 95 in 71 posts Likes Given: 172 Joined: Dec 2020 Reputation: 4 Hi V-22,
I appreciate your input, as I’ll be experimenting with different battery’s and propellers in the future.
Although I must admit... this quad was almost finished when I started the “build”, I’ll be doing some flight tests today (with the T40 and GF 4x2.5x2), I’ll post my findings... ![[-]](https://intofpv.com/images/collapse.png) • Posts: 1,506 Threads: 49 Likes Received: 714 in 525 posts Likes Given: 478 Joined: Oct 2020 Reputation: 93 13-Jan-2021, 05:15 PM (This post was last modified: 13-Jan-2021, 05:41 PM by V-22.) Nice! Can't wait to hear how it goes. What is your AUW? And what Kv motors? I'm interested to see some pictures of the build as well! When you're testing today, can you make a note of the throttle % and current draw at hover? It will be good to see how accurate eCalc is  BTW, using the 4025 props the numbers look even better. Theoretically it should be capable of 10km! ![[Image: imFXmgul.png]](https://i.imgur.com/imFXmgul.png) • Posts: 5,897 Threads: 47 Likes Received: 2,780 in 2,242 posts Likes Given: 7,677 Joined: Jul 2019 Reputation: 97 Hi Joshua,
Have you gotten any pictures yet? • Posts: 1,489 Threads: 92 Likes Received: 574 in 468 posts Likes Given: 0 Joined: Nov 2020 Reputation: 27 30min
20km
sounds like specs of a 1.2m flying wing Posts: 3,533 Threads: 265 Likes Received: 2,610 in 1,545 posts Likes Given: 3,893 Joined: Feb 2018 Reputation: 78 (13-Jan-2021, 11:26 PM)romangpro Wrote: 30min
20km
sounds like specs of a 1.2m flying wing Agreed romangpro..... I keep seeing real optimistic numbers from the "little guys" group. But so far no video.... Talk is cheap boys/girls, lets see some LR magnificence! If there is no video, it didn't happen.  My money is on Kaity or Harry that get out 5+ km.
Posts: 164 Threads: 10 Likes Received: 95 in 71 posts Likes Given: 172 Joined: Dec 2020 Reputation: 4 14-Jan-2021, 06:56 PM (This post was last modified: 15-Jan-2021, 05:31 PM by Joshua_A.) I done a two tests flights... ( no video yet, the camera is still shipping, although I add a deadweight to push the AUW to 245 grams) First flight: 51 degrees, 6mph wind. {mostly hovering, slow flight} = 31 minutes 46 seconds. Note: the battery was discharge to 7.03 volts (2,218mAh used), so in theory I had ~45% left in the battery. Flight two: 52 degrees, 10mph wind. {pretty fast flight, hitting 50mph perpendicular to the wind} = 26 minutes 10 seconds. Note: the battery was discharged to 7.04 volts (2,288mAh used). So I set the cutoff voltage to 3.1 volts just after this flight (I unsure if the quad can do 20km but we’ll see...  ) Posts: 164 Threads: 10 Likes Received: 95 in 71 posts Likes Given: 172 Joined: Dec 2020 Reputation: 4 • Posts: 1,506 Threads: 49 Likes Received: 714 in 525 posts Likes Given: 478 Joined: Oct 2020 Reputation: 93 Congrats on the successful test flights! Pretty impressive airtime Was that 50mph speed flat out? Do you have a GPS on it? Looking forward to some pictures and video! • Posts: 5,897 Threads: 47 Likes Received: 2,780 in 2,242 posts Likes Given: 7,677 Joined: Jul 2019 Reputation: 97 (14-Jan-2021, 06:56 PM)Joshua_A Wrote: I done a two tests flights... ( no video yet, the camera is still shipping, although I add a deadweight to push the AUW to 245 grams)
First flight: 51 degrees, 6mph wind.
{mostly hovering, slow flight} = 31 minutes 46 seconds.
Note: the battery was discharge to 7.03 volts (2,218mAh), so in theory I had ~45% left in the battery.
Flight two: 52 degrees, 10mph wind.
{pretty fast flight, hitting 50mph perpendicular to the wind} = 26 minutes 10 seconds.
Note: the battery was discharged to 7.04 volts, I set the cutoff voltage to 3.1 volts just after this flight (I unsure if the quad can do 20km but we’ll see... ) Hi Joshua, What battery are you using? What is the AUW with that battery? What is the dry weight? • Posts: 5,897 Threads: 47 Likes Received: 2,780 in 2,242 posts Likes Given: 7,677 Joined: Jul 2019 Reputation: 97 (14-Jan-2021, 06:56 PM)Joshua_A Wrote: I done a two tests flights... ( no video yet, the camera is still shipping, although I add a deadweight to push the AUW to 245 grams)
First flight: 51 degrees, 6mph wind.
{mostly hovering, slow flight} = 31 minutes 46 seconds.
Note: the battery was discharge to 7.03 volts (2,218mAh), so in theory I had ~45% left in the battery.
Flight two: 52 degrees, 10mph wind.
{pretty fast flight, hitting 50mph perpendicular to the wind} = 26 minutes 10 seconds.
Note: the battery was discharged to 7.04 volts, I set the cutoff voltage to 3.1 volts just after this flight (I unsure if the quad can do 20km but we’ll see... ) Hi Joshua, That is really good Fly Time.  Congratulations  What is the dry weight of your build? What battery are you running? What is the All Up Weight with battery?  • Posts: 164 Threads: 10 Likes Received: 95 in 71 posts Likes Given: 172 Joined: Dec 2020 Reputation: 4 (14-Jan-2021, 07:22 PM)V-22 Wrote: Congrats on the successful test flights! Pretty impressive airtime
Was that 50mph speed flat out? Do you have a GPS on it?
Looking forward to some pictures and video! Thanks V-22, I do have GPS, but with out a camera I was unable to get the speed or OSD... I calculated the speed from a short video from my viewpoint... • Posts: 1,506 Threads: 49 Likes Received: 714 in 525 posts Likes Given: 478 Joined: Oct 2020 Reputation: 93 (15-Jan-2021, 12:32 AM)Joshua_A Wrote: Thanks V-22, I do have GPS, but with out a camera I was unable to get the speed or OSD... I calculated the speed from a short video from my viewpoint... What are you using for RC? You might be able to send GPS telemetry back to the transmitter and record things like max speed and flight distance. • Posts: 164 Threads: 10 Likes Received: 95 in 71 posts Likes Given: 172 Joined: Dec 2020 Reputation: 4 (15-Jan-2021, 12:18 AM)iFly4rotors Wrote: Hi Joshua,
That is really good Fly Time. Congratulations
What is the dry weight of your build? What battery are you running? What is the All Up Weight with battery?
Thanks ifly4rotors, Dry: ~105grams Battery: ~140grams AUW: ~245grams By the way, I’m running two Samsung T40 cells. (4,000mAh, 45amp discharge rate, although some tests showed that 40amps is the max... I don’t care, I could never use half the allotted amps ) |
