Lightweight 4S 1304 on 3-inch with HD, RPM filter
By virtual_stephen on Nov 23, 2019
Had fun with some 1104 7500KV with 3S alongside 2.5" Avan props and the Pickle Mini frame - using JESC an RPM-filtering to drastically reduce propwash - so thought I'd try the Pickle 3" option. And hopefully keep the low-end bunch of the 1104 with enough power to push a 3" up to speed fast without struggling. Had tried 1105/1106 on 3" bi-blades and felt that it was having to take a run-up to everything I wanted it to do, power wasn't there on-tap unlike on the 2.5" props.
Check out some 1304 motors to allow for good torque but going lighter on the amps. These are LDARC XT1304 which have a T-mount.
The Avan 3024 were running really well but I'm testing out the HQ Prop 3.1x3x4 to see if it has better punch outs. On the Avan 3024 the build is efficient and throwing it around with aggressive acro and some speed runs I can still get 4 minutes flight times.
And of course it's carrying the Caddx Turtle Nano Whoop edition! thanks to the Eachine Nano for that. Canopy is the Nucleon Micro AXII version. Tough and rigid plus room for the axii in the back. RX/TX wired to FC to start/stop recording on a mode switch cos I'd don't want hours of me tuning on my SD card ;-)
NamelessRC AIO412T board running JESC and RPM filter on Betaflight 4.1.1. Propwash almost entirely eliminated after tightening the canopy a little and reducing the filtering.
Best thing about this, no props in view if you keep the camera title past about 35 degrees!
Note: the eachine nano doesn't want to speak Tramp properly for reasons that are entirely inconclusive. I tried a regular UART TX and also a SOFTSERIAL but only pit mode works, no channel or band or power setting with Tramp. Had to play morse-code on tiny LEDs to setup the VTX, I would definitely not recommend doing that often. Need to check soldering and might swap the nano vtx for another eachine nano or perhaps the namelessrc nano. Eachine nano get's dangerously hot on most of it's modes and the lack of any mounting options or anything to act as a heatsink is kinda a pain. I would be concerned about the heat involved being enough to distort 3D prints, it's certainly enough to melt the glue holding it to the foam tape between it and the turtle.
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I Am also about to try the 1304 - 4000kv 3inch on 4s, very similar configuration, I was thinking to go voor tattu 650mah packs, what size you do recommend, I hate sagging lipo, which I think is the problem going to small size pack.
It's a lightweight build so I would recommend a smaller pack to preserve cornering control and response. I fly a 450mah or 550mah 4S and I can still throw the quad up into the air. Personal preference is important of course.... it'll fly with a 1000mah 4S but blow out on the corners if you want to be able to do 5 second throttle punches!
just weigthed my packs: mah*V/1000= Watt Hour
tattu 4s 450 - 56gram, 7.56WH 0.13WH/gram
gaoneng 3s 550 - 55gram, 6,93WH 0.126WH/gram
tattu 4s 650 - 68gram 10.92WH 0.16WH/gram
Note the Tatu450 and gaoneng 450 are 2years old (maybe current packs are lighter ?) , the 650 tattu I just got this week, but relatively, you get almost 20% better energy density on the bigger pack.
Yeah, the cables make a difference to overall energy density on smaller packs but lighter = more responsive and the difference is felt in tight turns. For cruising I have a 4S 750Mah which works fine and gives long flight times. 4S 450Mah gives 3-4 minutes of aggressive freestyle.
Are those cells HV? My 450Mah GNB is 53g and only 6.84Wh and it's a HV. So I think your tattu should be less than 7.56Wh. I only charge the cells to normal non-HV voltages to reduce wear so my usable Wh will be less.