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hobbywing quattro comment from sept 2012
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installed on a 600MM quad. Took off 4 esc's and a power distribution board and assorted wiring and connectors which weighted 168 grams and put this on with connectors and hold downs which weights 122 grams and what a difference. More response, quiet, longer flight time and runs cool, after 7 minutes temp measured 120F. Worth the effort to install. Had to use M3 on M4 and M4 on M3 but thats not rocket science. Cheap as buying 4 esc's and PD board. Motor wires come with female gold connectors September 13 2012 |
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I connected the QBrain leads directly to the motors (2211 1700kv) but even if the QBrain weighed the same or a little more, I would still use it over the ESCs. For one, it's cheaper than the ESCs, more compact, neater install, and I never had a DOA, or one go bad out of the 8 I have been using. One thing I noticed is that the 20A and 25A weigh the same. Go figure. Now, like Jose says, I would like to see them make some in the 10A size. I'm sure you will see them soon. |
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The way I do it, is to remove the white wire for the BEC plug and swap it for the red wire on the other plug. So you will have the BEC and the red sig wire on M1, and orange on M2, white on M3 and brown on M4. Now if you mount the QBrain face down, all the leads go to the right motors. With the cylinder thingies facing fwd. any questions?
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The HK F-20 and F-30 are also identical apart from the FET's, yet HK list the F-20A as 30g and the F-30A as 32g. If you take the heat shrink off both you wouldn't know which is which. A lot of ESC's are like this for good reason. |
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I just weighed a new F30-a 30A (not 20 or 25A Qbrain rating), 26.4g out of the package, so 105.6g for 4, less than qbrain before I chuck the 2g ferrite bead on the servo lead (saving 8g) and then shorten the wires. Maybe you believe what you read on the internet, I dont, I like science, aka testing. With drilling the heat sink, light weight shrink wrap (with ventilation holes), shorter wires, all solder (no stupid bullets) and a few other mods (caps, lin regs,etc), I could take off ~15% to 20% weight (it will come sooner or later). After racing RC on-road for 21 years being sponsored, I know all about saving weight to shave a few ms off lap times. I am not worried about weight (yet) with my current quad at 7:1 PTW, as most quads don't break the 4:1 PTW After many 2 minutes runs of WOT flying with this quad, I am ready for my HP and am ready to build my next quad shooting for 10:1+ PTW, so yes weight will be a top concern on that build, but it is slowly coming together and back burner to other projects (APM2.5, FPV, Z1 glider, 1.6m P51 and personal record mission attempt). BTW, if you have a problem with one channel on the qbrain (bad crash, water, etc), does that cost 4 times as much to fix (aka = brain-fart)? (I seen how they grind the P/N off the uBEC IC, so if it goes, it's done) |
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Last edited by --Oz--; Oct 22, 2013 at 11:56 PM.
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Edit: first and only time that I've had any sort of problem with it in over a year of flying. I'd hazard a quess about 125 flights it did a slow down not a cut. It drifted down at about 1/2 power. |
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I wonder if HK is actually putting a 20A sticker on the 30A version in some cases; like they ran out of 20A's. |
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