14 May, 2019 at 20:31 #61899
I’ve been using ecalc for years. I was really wondering about the physical size of the lipo and whether or not it would fit.
What is the AUW weight of the tri LR without lipo with typical fpv setup?14 May, 2019 at 20:46 #61900
Dont know as i only just got mind assembled today. Will post specs and a photo tomorrow.15 May, 2019 at 10:38 #61902
Did the Maiden flight using 5″ Dal props just in case something was setup wrong I don’t lose a full set of 8″ HQ’s due to an Auto-Flip. Dal 5″ props are cheap, while HQ is a bit too costly to risk on a test run.
So far, everything works, including the Telemetry!
Notice that I don’t yet have a Camera or VTX installed. Figured it would be easier to troubleshoot after the Maiden and to later install the Camera. (Still have to buy one though, dam i forgot) I did however have an extra 20 mm camera TPU mount from the Tri-Baby. Fits good here so far but I may need to add 1 mm spacers when the camera is installed as it looks as if the Stand-off spacing is slightly wider.
Under the Arms, I’ve added extra large Zip-Ties to act as feet to help steady the Tri during Takeoff and Landings. This also has the benefit of helping to keep the Tri remain level when first arming. (During Gyro self-cal) Otherwise I’m sure the LR would slowly start to drift in Auto-Leveling modes. (as do my other copters)
Going out to Autotune and will post the results later. That is assuming the Wind cooperates with me.15 May, 2019 at 11:19 #6190315 May, 2019 at 12:47 #61904
Hovering < 18% Throttle with a Motor Thrust Factor of 23.8. Man this Copter is so powerful, 5.5 to 1 TWR !!!
Side note: After my first test flight and later Autotune, the LR was vibrating badly so I stopped the Tail-Cal and landed. It appears that i lost two screws from the right motor. I’ve since replaced those and added a small amount of Blue-Lock tight to All motor screws to prevent them backing out so easily.15 May, 2019 at 13:56 #61905
Did the 1st real flight after tuning. Tried to get as close to half a battery as possible..
Vbat 15:12V (3.78 per cell) as per RC Telemetry (Just over half, 3.7V)
Figuring that the copter could fly for about 15-16 minutes on 4S. Which is about twice that of the Tri-Mini and three times that of the Tri-Baby. Going full acro-mode I’m guessing 10-12 minutes would be about right. The Motors do get warm to the touch due to the prop load.
That being said, it looks to be possible to do an hour on 3S-6000mAh LiPo. Just in case anyone was wondering.15 May, 2019 at 18:06 #61907
@kevin_erik Nice build and thank you for all the information. What settings do you use in xcoptercalc, since the motor is not in the database (yet)?15 May, 2019 at 20:06 #61908
Look for motors of the similar specifications.
Wattage will be the hard thing to match here simply because theres no much data from Emax on this. Just find a motor with the highest Wattage rating that still meets the Size and KV. Once you have that, you can use this to create a custom motor by changing specific values to get as close to Emax spec as possible.
Side note: You need an account on eCalc to be able to customize values and have complete access to the data base.
Be aware however that if you dont customize, that eCalcs data base is a bit old so your likely to find motors that are much heavier for the same size and KV. Emax’s new motors use Titanium shafts and a light weight bell design that makes a big differance to the overall weight / performance of the copter.15 May, 2019 at 20:27 #61909
At first glance your data looks similar to mine. I had a servo speed of 250, I’m guessing if you were running your servo at 5V that would account for the difference. My thrust factor was 25.something, which is ballpark with yours, and I’m running on 3S. Would have to check the tune for specifics but I think it’s in line with what I got. Nice looking build!15 May, 2019 at 22:14 #61910
Servo should be running 6V… Guess i will have to double check the output then.15 May, 2019 at 23:05 #61911
Yeah, every time I’ve done it, I’ve gotten a servo speed of 249.9ish, so basically 250. For sure something is different between our results.16 May, 2019 at 08:35 #61916
RCExplorer – DavidKeymaster
Very nice looking build Kevin!
In my tests running the setup on 3s is more efficient as you use the motors closer to their peak efficiency inside the powerband. But I didn’t do enough testing to determine how much of a difference there is.
Would be cool to try a 3s and a 4s with the same Wh and have the coper weigh the same.
Any pics of your setup @swissfreek ? 🙂16 May, 2019 at 16:01 #61921
Regarding flight time, David’s write up says 3sx5200mah yields 40 mins of hover. If we assume 80% being used then that means the LR uses 104 mah/min in a hover. So to achieve a 1 hr hover that would use 6240 mah. So you would need a 3sx7800mah lipo to hover for 1 hour (using 80% capacity).
16 May, 2019 at 16:25 #61923
- This reply was modified 1 week ago by billyd.
Has anybody considered using a pack built from 18650 cells. You could build a 3s x 2p 6ah pack that weighed 300 grams. This should improve flight time?16 May, 2019 at 18:07 #61925
This is the battery I am considering
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