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As much stuff as you've got in this plane you may want to consider a payload tray something like this guy has done:
http://diydrones.com/photo/album/sho...ntPage=&page=1 Paul |
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I do believe RF was the problem, please see photo for component proximity; my ESC is about 4 inches from base of V.Tx ; I wish I had disconnected the V.Tx during the problem solving on the ground, it would have been the easiest differential diagnosis....unplugging one wire would have done it ! damn I know better next time....I just do not know that many people that fly SkyS with full ET FPV to ask about their component positioning.... |
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*Back in the days when it was like a real swap meet, rather'n the "just-another-retail outlet' + scam-o'-the-day thing it is now. Quote:
Meanwhile, I'm in process of constructing (there I go again!) a small set of 'stilts' on 2mm basswood platform backed with velcro for mounting, so's I can mount the jacketless 20A ESC bare ass naked 'in the wind' & hoping that'll keep it cool until I can get the 30A unit rigged up (was 1 connector short; on order). First testing a patch of epoxy (curing right now) to make sure it's not conductive : |
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Last edited by StarHopper44; Aug 20, 2011 at 09:45 PM.
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I had a similar event with a Gaui 330x and interference from the video tx and the four ESCs on it. It range-checked well, but once about 50 feet up and under full load the rx went into fail-safe. We determined that it was the 900mHz tx bleeding over and knocking out the Futaba FASST's reception. Fortunately, we set the fail-safe with throttle hold. It just stayed in GPS hold until the batteries wore down and since we set the ESCs to avoid drop-out it just came down gently. Once you sort this out, you may want to keep some throttle present during fail-safe if your RX can do that. |
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Epoxies (except aluminum loaded ones) are excellent insulators (non-conductive). The reason for the heat-shrink on the ESC is to keep the metal heat-sink in firm contact with the top of the driver FETs. I hope you plan on keeping the heat-shrink in place. Most epoxies are lousy thermal conductors. The inexpensive ones that are good are also electrically conductive.
I've used that BEC, it works pretty good. Paul Quote:
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RootCanalGuy,
From an engineering point of view and from an FPV point of view, you never want to add it all on at once and expect it to just work. You'll never know what caused your problems. You have not only RF equipment in your vTx but you added an OSD, stabilization, pan/tilt, and a noisy UBEC. First off, change BEC's. The CC UBEC is really nice and I've used it for FPV before but there have been many reports that is it very RF noisy compared to the HK UBEC's you can get for <$5. Once you get an airworthy airplane and maiden and make sure all is well, you need to take it one step at a time. First, add on the video transmitter and camera on a fixed mount. Don't do anything with your OSD, FY-whatever, or pan/tilt. Do a ground range test and if that checks out, fly that around LOS with a ground recording and see if there are dropouts anywhere. If the range test fails, then reposition until it works, otherwise, don't fly. Once that works without issue, then you can add the OSD and do the same thing. Ground range test, then LOS with recording, then if all pans out, have fun with it. Then add pan/tilt and do the exact same thing as before. The FY-whatever can be right after your re-maiden and before any video gear with the exact same steps, but if you are using the full ET OSD Pro, why the FY? It'll do RTH for you and with the Guardian, it'll stabilize itself too. I personally have no idea what could have caused your crash. You have too many unknowns since you went from maiden to FPV flight so any number of things could have gone wrong. 900Mhz video gear doesn't play well with GPS sometimes too so that doesn't help. One rule of thumb is use video gear that is at a higher frequency than your control gear so in your case, you should be using 5.8GHz so you might start there but before you do, just use what you have and add one thing at a time and you'll find any problems that way. From reading the FPV forums a long time (and I've quit lately), don't go asking for help there yet until you do the steps, otherwise, some will just get upset that you tried to jump in feet first when you should have waded in with floaties on. Once you go through each step, I'm confident you'll find your problem and when you find your problem, figure out why it's an issue by checking the forums and 99% of the time, there will have been many that had the same issue and it'll usually be something simple that will fix it. If not, they'll help you out, but usually only if you've done the steps. They can be a snobby group sometimes but they're really helpful if you do things in a methodical way. |
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[ADDENDUM:] Hey, looky what I just found. This is the EXACT one I told you about - just not 'Shack' branded. (Note edge view showing combo 'Alligator Clamp' / Stand / Magnetized strip on back.) Guessy what I just bought one of! http://www.amazon.com/distributed-by.../dp/B0007LNEO6 |
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Last edited by StarHopper44; Aug 20, 2011 at 10:52 PM.
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Talking countdown timerQuote:
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(You oughta hear his burps!) |
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The tip is on the first page of this thread.
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Latest blog entry: Eagletree Guardian vs. Eagletree Vector
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