Yorkman
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Posts posted by Yorkman
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Blimey guys, can we stop squabbling?
I understand the functions of both the BEC circuitry and the LVC circuitry, and perhaps am guilty of mixing my acronyms....
,so will try again and hopefully not offend anyone this time!Frank-you seem to have missed my point-yes, I am running brushed ESCs, which is why I was advised to use a Lipo saver...carefully now....which is in effect another LVC, (perhaps 'autothrottle' more accurately describes its function) upstream of the ESCs rx connection, linked to the balance lead of the lipo, so able to read the pack voltage and an appropriate shut off/voltage reduction point for that pack? At which time it reduces voltage to the ESCs to give a noticeable reduction in power as a physical indication. I've got that right?
However, having introduced a UBEC into the setup, I have disconnected the red power lead from the ESCs to the Rx (which had the lipo saver in series with it) which has rendered the lipo saver non-functioning, hence I am left with being careful as my way of preventing over-discharge..
That is my understanding of the situation-I stand ready to be corrected!
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Thanks guys-will carry on as I am, then....well, I will when we get some flying weather...
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Apologies if this has been covered elsewhere...when I 'converted' to lipos from nicads, I was advised I needed a 'lipo saver' which plugged in line with the ESC(s) (the model has two), which would reduce power to the motors well before the lipos approached their critical voltage (I presume this is well above the voltage of the normal bec motor shutdown)-all fitted, tested, performs as advertised.
However, as we know!, the accepted wisdom (especially with 2.4ghz) is to run a separate 6v UBEC for rx/servos, and disable the bec function of the esc, which I have now done....but which of course now renders the 'lipo saver' inoperable
...Sooooo, is there a way round this? Or do I simply ensure my flight times are short enough to stay well clear of discharging the flight pack too far-which is my approach at the moment.
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"Yorkman, The lower (‘unbendable’) part of the unit is more than likely a series resonator (coil) with a tapped series capacitor and will have no effect on the actual radiation pattern of the antenna. The effect is to make the antenna behave better than it physically is. Again this is an assumption but more or less confirmed by the diode ‘test’."
I kind of guessed that would be the case!
So-what if the upper 70mm of aerial was banana shaped? I know this is nothing to do with the original thread (well, much) but just throwing out a few ideas, wondering why, with all this technology, we still accept the 'DOD's existence?
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thanks Tim-just looking at my Tx and thinking-if it was possible to angle the aerial 45dgress away from oneself, and assuming, as you say, holding the tx flattish, that puts the DOD either in the ground about 30 feet away, or somewhere behind your head...neither places one intentionally flies ones model...
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all this talk about antenna outputs and the doughnut of death-as the spektrum tx aerial is bent halfway up its length, doesn't this remove said confection? Aren't there two 'tubes' -for want of a better word-of transmission waves? (you can tell I'm no expert on this!) overlapping and cancelling any 'blind spot'?
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'do you bench run your model at WOT until the LVC shuts down the motor and record the time? Do you then use that as a safe flight time '
well, that's what i do.
And you don't drive about at full throttle the whole time, either. Well, I don't...
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Following this thread with interest, as pretty relevant to my concerns with the York (if you've seen my thread 'any thoughts'), just to say, fiddling around with it on the table last night, i discovered that 'wiggling' the elevator servo lead near the rx would occasionally cause the servo to move..disconnected, 'thinned' the plug on some wet and dry, reconnected, won't do it now.
Just to reinforce Timbo's line about 'dry' connections-electrics can do funny things-maybe Shaun the ubec/rx plug was just that little bit dodgy...and decided at that moment to quit?
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well the spektrum Ar6200 has two separate rx joined by about 6 inches of wire-and the two rx should be positioned at 9 to one another-definitely no talk of bending wires.
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is the 6100 a single receiver then? I assumed this talk of putting aerials at 90 to one another was referring to the 2 receivers as in the 6200?
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looking forward to some reassurance!
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Shaun Chant wrote (see)
I'd be happier if they'd replace the model too.
look on the positive side-at least you can go to the shop and buy a new one. If I stuff the York then that's it-my dad's not going to build another one.Am even thinking about making a trip to the ex-in-laws' and digging my old twinstar out of their shed for radio testing purposes....
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i may be wrong here, but didn't the very early 'wright flyer' type things have a system where you pushed down on the relevant pedal to warp and therefore lower the wing on that side? And the wheel on the stick was connected to the rudder? That could be the start of 'right pedal, right turn'
And also very early 'mode1'
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what a bummer
getting nervous about flying the spektrum again now...until this gets an answer...might put my ancient JR back in and try to remember not to point the aerial at the model...
commiserations Shaun
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glad to hear it went ok Matt.
hope to be out on tuesday now, weather permitting, and hope to be back here with a similar positive report!
Martin
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i guess if no-one tells you any different....
i remember 'piloting' a Falke motor glider at about 15 and pushing the rudder pedals as if they were the steering front axle of my go-kart
...got the instructor's attention... -
guilty as charged of picking thru the bones of this-just got my attention that both Matt and I suffered uncommanded elevator output, and are both running the same tx/rx setup...i DO hope it's just coincidence,and that replacing the servo has fixed it!
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depends what you mean by full travel?
i've reduced the throw on the elevator considerably, using the facility on the tx, to 60% of the available. and i was 'cycling' the control up and down,full stick movement, so when it stopped it was at 'full' up-but it didn't move any further than i had moved it with my control input, if you understand me!
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well, the radio maintained good contact to a distance of 60 paces-twice what's recommended.
only thing noticeable was that if signal loss occurred while elevator was up, it would stay in that position for about a second before returning to neutral. no sign of any uncommanded control movements.
hoping for the best!
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thanks for that.
just going to have a little trip to the park with my Tx and fuz, do a range check and see if i can get my elevator to do anything strange.
keep you posted
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' Assuming I have a plane left in one piece after it happens again!
'My concern exactly!
Did you speak to Horizon Hobby in the uk? Have you got a number?
Fingers crossed for sunday-let me know how it goes?
Cheers
Martin
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it's the AR6200-bought last week, with the transmitter, the Tx/Rx package is out there for sale at £100, this was its first flight, range checked satis, etc.
Have changed the elevator servo, despite being unable to replicate the fault. Hope to try again Monday-are you flying again before then?
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I don't think the rubber bands are involved-try holdin the wing and seeing if you can get the fuse to move just by 'bouncing' the wing-bet you can't.
I'm intrigued because we both have Dx6i and we've both suffered involuntary loops...coincidence?
UBECs and lipo savers
in General Electric Flight Chat
Posted
exactly!