Planning e-conversion for 33% extra

[jbm]

Resurrecting this old thread - I finally kicked my friend's ass to get a motor mount made, so now the 33% extra is alive Cheap hobbycity components used, but the motor has been stripped and reassembled with a couple of mods.

(Side note: On another motor of the same type it arrived with loose screws holding the can to the shaft, and the circlip holding the shaft in not seated. Neither problem was very noticeable to the naked eye, and would have resulted in failure in no time at all. Combine that with a design that won't let you wrench on the standard prop nut very hard, and I think 90% of the reports of failure can be covered- poor factory assembly and one design flaw. Fix the flaw and check it over with a careful eye and you're home free.)

I'll be re-maidening the old girl at the weekend, and ground running at the club field tonight to check rpm and current draw. Everything runs smooth and clean in the workshop, but full throttle was in danger of rearranging my tools LOL

The spec is:

EMP 80-100 130kv motor (basically a slightly evolved version of the good old turnigy magnet dropper / bearing wrecker)
Custom DA50 style prop hub, doubled up grub screws for shaft to can. Custom mount to match DA-85 pattern for convenience.
120A K force controller
26 x 12 wood prop
12s 6500 or 12s 5000 packs

I'll keep you all posted.

[jbm]

On freshly charged packs, after the 10 seconds of wide open throttle it settles to 90A and 44V on the 26x12 - just under 4kw input, which should be OK for starters. On the ground it feels like it pulls every bit as hard as it needs to

I've room to prop it up a bit further if I feel like it needs it. Flight report at the weekend

[jclaude]

Hi JBM,

Could you post some pictures of your home made prop hub?
I waiting for your flight report.

Regards,

JClaude

[jbm]

I'll take some pics tomorrow - I'm expecting a larger prop to arrive so I'll be taking things apart

I've only flown it on a 26x10 so far, as I didn't notice that my 26x12 was drilled for a different spinner... the 26x10 is a bit lacking in power, drawing only 75 amps, but the plane flies OK for pattern on it. I'll test a 28x12 - hoping it'll draw about 110 amps.

The sound of the plane in the air is lovely- its as loud on a down line as on the way up LOL

[gdryer]

In case you missed this in my Sukhoi thread. Here are the numbers for my ESC test on basically the same motor.

HXT 80-100-130 motor
Xoar 27x12 propeller
4- 6S Zippy 4000 (20C) 12S-2P
Ambient Temperature 35C at sea level

[jbm]

Well my ESC died on the ground... a shame but I think there was an inherent problem of some sort, as I was monitoring the voltage and current closely on running up a hotter motor for the first time. (180kv instead of 130kv).

At 42v and 70 amps the magic smoke came out of the K Force 120A controller... closely followed by the magic bloody great flames - fortunately everything survived, except the paint on my cowl which bubbled from the momentary heat!

I've been happy with the HXT motor, but having seen the new version Hobbycity are selling I'm going to be much more comfortable throwing the plane around. It looks the same, but really isn't. Huge great rear bearing, no more reliance on a tiny retaining circlip and even a standard gas style prop adapter to get away from torquing against the bearings when fitting your prop. The windings are nice and tight and well done too, where some of the old ones were very lazily produced.

HC are now also selling an ESC that truly opens up the potential of the motor: 200 A HV esc It seems to come from a respectable manufacturer too.

I might yet get close to the crazy vertical that I get with my 27% / Hacker A60 setup.