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Old 10-02-2019, 10:05 AM   #1 (permalink)
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So again loving the Mini for several years. Flies really good - so good I don't really mind the little reliability sniggles it has every now and then.

Sure I could get the new XL380, and probably will. But for now, in the 2lb range all-up, the slightly smaller ~350 size is nice to have with my 1300 lipos.

The only thing missing is a proper "engine". Sure the 28xx is a killer motor, but here with my slightly more delicate specs, I am fortunate that Xnova made a 2618 motor (rated almost 1hp) with "B-spec" shaft that is a direct replacement for the undersized 2221ish Scorpion motor that came stock.

However, two issues need to be addressed. One, the motor is a little wider than the frame and so some cut-outs need to be made to accommodate. Two, the kv is higher at 1360 vs 1300, more than likely requiring dropping a tooth.

1. Bolt both frame halves together and place in vice.
2. Jig the area with some metal hard stops to prevent over-travel.
3. Use a flat file (this one from Harbor Freight ~20mm perfect size)
4. File down about 2mm of frame. Position squarely in the center between the two motor mtg holes.


Kinda like sticking a 350ci V8 into a Chevy Vega or for Mike, a Triumph Stag.
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Old 10-02-2019, 10:57 AM   #2 (permalink)
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Nice work, I don't think you'll need to re-gear for the extra 60kV - you should be fine on 15T (I was running my MSH 1300 kV on 16T)
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Old 10-02-2019, 11:12 AM   #3 (permalink)
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Thanks. You're right. We're talking small gearing percentages either way.
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Old 10-23-2019, 07:10 PM   #4 (permalink)
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A few quick flights with the new pumper shows it to be significantly more cool running, a wee-bit more power efficient, and more grunt at pitch pops. Also the one-way pinion seems to work better on this shaft over the stock motor, with no lock-ups so far. On the down side, there does seem to be a high-pitched bearing noise from the motor that the latter did not have.
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Old 10-23-2019, 09:42 PM   #5 (permalink)
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Try changing the motor timing,maybe a little less
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Old 10-24-2019, 05:55 PM   #6 (permalink)
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Thanks. I tried moving pwm and timing up and down with no affect on the noise. Strange it does go away at idle up 1 and 2. Can't really tell at this stage whether it's winding noise or some kind of mechanical. It's a high pitched wine/whistle at my lowest rpm gov setting on the Talon 35.
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Old 10-25-2019, 12:20 AM   #7 (permalink)
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I was going to ask what ESC brand - I have used many brands including CC and I have often had squeaky noises from the ESC / motor.

Do you have another ESC that you can try?
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Old 10-25-2019, 10:40 AM   #8 (permalink)
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Thanks. In this case, different than that esc noise of the windings resonating at the lower human audible range.

You know, a wild guess is that this noise might actually be from the motor fan itself (literally whistling) at this curious rpm. No biggie really, since I don't run much in normal mode anyhow. Will have to some day take-off the belt and run'er up and get close to find the mystery.

If it is something say a bearing then I'm sure this will get much worse with time.
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