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- Thread starter f91ddr
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I haven't built or flown one that small, but Altitude Hobbies (I don't know where in the world you are) has eMAX 1306s in 3300 and 4000 kv models.
The eMAX 2205s are pretty popular today.
The DYS 1806 3000kv motors are not bad motors. I am loving them on my 4" Alien. You might be surprised by DYS.
The eMAX 2205s are pretty popular today.
The DYS 1806 3000kv motors are not bad motors. I am loving them on my 4" Alien. You might be surprised by DYS.
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60g frame . . . bit heavy for a 135, but it's printed not cut. I think you might be overestimating what is "light" in this scale.
I do recommend the RCX 1407's. A lot lighter than the 1806's with a better punch than the typical 1306's. The 3800kv version is better sized for 2-3S, where the 3200kv version is better sized for 3-4S. the 3800kv version can also drop you to 3" . . . just because you can swing 4" over the body doesn't mean you want to loose that part of the thrust column. GetFPV carries them domestically, MyRCMart carries them via slowboat.
Despite the sizing, I fly the 3200kV version on 2S all the time and it's still got enough pep to stay interesting.
Also . . . might want to check your numbers. Cross motor distance of 135mm will give you no more than 96mm (3.7") between the nearest motors. You'll need at least 145mm frame to support a 4" prop, and even then it needs to be perfectly square and the props will be tight . . . not to mention the body eating a quadrant out of each thrust coulmn.
I do recommend the RCX 1407's. A lot lighter than the 1806's with a better punch than the typical 1306's. The 3800kv version is better sized for 2-3S, where the 3200kv version is better sized for 3-4S. the 3800kv version can also drop you to 3" . . . just because you can swing 4" over the body doesn't mean you want to loose that part of the thrust column. GetFPV carries them domestically, MyRCMart carries them via slowboat.
Despite the sizing, I fly the 3200kV version on 2S all the time and it's still got enough pep to stay interesting.
Also . . . might want to check your numbers. Cross motor distance of 135mm will give you no more than 96mm (3.7") between the nearest motors. You'll need at least 145mm frame to support a 4" prop, and even then it needs to be perfectly square and the props will be tight . . . not to mention the body eating a quadrant out of each thrust coulmn.
. . . Legend in my own mind, maybe. So if you believe that, does that mean it's a shared delusion?
So a 190 quad. Ok, frame weight and sizing sounds a bit better, and the 1806 doesn't seem bad at all.
As for "best", that's a relative term. You've mentioned it's not going to have FPV gear -- no law against that -- So what do you envision doing with this quad? At under 200mm, this airframe will probably zip out of LoS range amazingly fast, even running sedate motors on 3S with pretty red arms (they do look nice). Lights can increase the LoS range, but even then you're looking at flying something that can be quite fast in a relatively small bubble of airspace.
The "what do I want to do with it" will help determine how sedate or aggressive your power system needs to be.
So a 190 quad. Ok, frame weight and sizing sounds a bit better, and the 1806 doesn't seem bad at all.
As for "best", that's a relative term. You've mentioned it's not going to have FPV gear -- no law against that
-- So what do you envision doing with this quad? At under 200mm, this airframe will probably zip out of LoS range amazingly fast, even running sedate motors on 3S with pretty red arms (they do look nice). Lights can increase the LoS range, but even then you're looking at flying something that can be quite fast in a relatively small bubble of airspace. The "what do I want to do with it" will help determine how sedate or aggressive your power system needs to be.
Makes perfect sense.
Going light on the power system should give you the power you need to fly and keep her tame. The lower thrust:weight will make her a bit more sluggish than a NanoQX, but should still have some aerobatic ability without getting too far away too fast.
Spitballing, but I'd expect with that frame and 1306/1407 motors and a 3S 1000mAh should get you in the neighborhood of 300g AUW. That means you'll want to target 150g/motor WOT minimum. 175-200g/motor would be a bit better. Look at the motor/prop spec's and find something at 3S with 4" prop putting out that kind of thrust. Just looking at the prop data, the 4" length, the kV in the high 2000's/ low 3000's for 3S will be up around 250-350g. Dropping those motors to 2S would help. Otherwise, kv in the low 2000's for 4" prop are near what you want for 3S.
So . . . more headroom but you've got to watch out for the aggressive punch, then 4", 3S, 3000-ish KV -- prop down or drop to 2S for a gentler ride. Less headroom but 3S is friendly-but-capable, 4", 3S, 2000ish kv.
Clear as mud?
Going light on the power system should give you the power you need to fly and keep her tame. The lower thrust:weight will make her a bit more sluggish than a NanoQX, but should still have some aerobatic ability without getting too far away too fast.
Spitballing, but I'd expect with that frame and 1306/1407 motors and a 3S 1000mAh should get you in the neighborhood of 300g AUW. That means you'll want to target 150g/motor WOT minimum. 175-200g/motor would be a bit better. Look at the motor/prop spec's and find something at 3S with 4" prop putting out that kind of thrust. Just looking at the prop data, the 4" length, the kV in the high 2000's/ low 3000's for 3S will be up around 250-350g. Dropping those motors to 2S would help. Otherwise, kv in the low 2000's for 4" prop are near what you want for 3S.
So . . . more headroom but you've got to watch out for the aggressive punch, then 4", 3S, 3000-ish KV -- prop down or drop to 2S for a gentler ride. Less headroom but 3S is friendly-but-capable, 4", 3S, 2000ish kv.
Clear as mud?
"Small" lends to higher kV. It's just the physics of the thing. It's not really as much an effect of "quality" as much as size and how it's wound.
The same motor can be rewound in a few different ways (more/less turns, Y vs Delta) to impact the kV, but the smaller the motor, the higher the middle kV will be. 22xx motors are going to be very high 1000's with hot windings typically in the low-mid 2000's. 18xx motors are going to be low-mid 2000's with hot windings in the high 2000's. 13xx/14xx's are going to be low-mid 3000's, with hot windings in the high 3000's (4000 is just about as hot as it will get). Hotter windings are a bit less efficient but allow you to dump tremendous power for the size . . . not quite what you're looking for. DYS's 1306 wound to 2300kv is actually a fairly cold winding -- you won't get much power through it, but it'll have a much wider efficient range. For 3S it looks fine . . . but 2s? probably not so much.
Keep in mind, the kV specs I've made are not for "getting the most", but "getting just enough" out of a 4" prop on 3S. You can bump up closer to "getting the most" out of this size motor and reduce your throttle, voltage, or prop to calm her back down. In the latter case, picking up the 3000-ish kv motors will give you more headroom.
The same motor can be rewound in a few different ways (more/less turns, Y vs Delta) to impact the kV, but the smaller the motor, the higher the middle kV will be. 22xx motors are going to be very high 1000's with hot windings typically in the low-mid 2000's. 18xx motors are going to be low-mid 2000's with hot windings in the high 2000's. 13xx/14xx's are going to be low-mid 3000's, with hot windings in the high 3000's (4000 is just about as hot as it will get). Hotter windings are a bit less efficient but allow you to dump tremendous power for the size . . . not quite what you're looking for. DYS's 1306 wound to 2300kv is actually a fairly cold winding -- you won't get much power through it, but it'll have a much wider efficient range. For 3S it looks fine . . . but 2s? probably not so much.
Keep in mind, the kV specs I've made are not for "getting the most", but "getting just enough" out of a 4" prop on 3S. You can bump up closer to "getting the most" out of this size motor and reduce your throttle, voltage, or prop to calm her back down. In the latter case, picking up the 3000-ish kv motors will give you more headroom.
