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The reason I posted my question here is I wanted to know if anybody else had the similar problem and maybe there was a solution for it ... I am sending my receiver in for repairs.... It sucks though, I am left without a receiver for my new Twist as I am going to use the 6 channel Optima from the crashed Katana on my new heli...... |
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Not sure I understand your recommendation here. you are suggesting taking the output of the ESC and making a 'Y' out of it so as to plug in the receiver into a single ESC twice? If the ESC has a reduction in its output voltage due to load, both ports you are plugging into will see it. If you are saying tap power off the battery directly, I do not follow how that will solve the problem. This battery/ ESC combo cannot keep up with the load to begin with. Is it possible a bigger battery is needed? Would a second BEC into the SPC port help ? What if it is the battery that is dropping its input voltage, will it still help? Wouldn't the best senario be to get a secondary battery just to run the receiver? AS you can see I am rather confused. Clarification would help extensively. thanks Frank |
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"...This battery/ ESC combo cannot keep up with the load to begin with..."
Nope, the battery keep, is the BEC from ESC which is failing. For this reason the SPC port must be connected directly to battery. You can use for this purpose either the balancer plug of the battery, either solder a servo plug to the ESC * input * or the Deans, as Mike suggested. |
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Only through the SPC Port. The servo bus is limited to 2S Lipo (officially.)
Mike. |
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5 volts after a full charge is kinda low for a 4 cell nicad, should be closer to 6 volts. if the battery is that weak then the load from the servos might just be pulling the voltage down too low for the receiver....easy way to try and replicate the resulting brownout would be to put work the tail surfaces with the radio while giving them some resistance with your other hand....or if the plane is gone then just hold the servos in your hand...
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At this point I am sure of one thing -- I will test the hell out of my radio on the ground before I decide to fly my new Twist. |
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All of my planes flew great before they crashed too Not making fun of your loss, but I fail to see your logic. And yes, 5v is way too low for a 4.8v pack under no load. I would suggest your pack is past its best.
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Anyways, I have switched to a LiPo pack.... |
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All of these brown outs if that is what are really happening is strange to me.
A fully charged 4S Ni is only 5.6 at best so IMO 5V under load is fine, I have flow the Hitec 2.4 module in mt Eclipse7 with matching 2.4 6channel receivers(one at a time) with a Castle creations 25A ESC using on board BEC and 4 htec HS55 servos doing full 3D in some rather high gusty wind with no issues. Most of the time the reason for servos drawing massive current is simple. Poor installations,tight hinges, binding push rods , servos binding at their extremes when some mixs are turn one. Put a DVM in line with the battery / receiver and work the servos one at a time them try them in combos then in combos with mixes on. Dimension Engineering sells a Servo Sense (or did) that willl log servo current. Charles |
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The other person wasn't quoting the voltage is being under load, it was with no load. If it was under load, yes, I would agree with you, but 5v with no load is way too low. Once the servos starting drawing current, the pack will very quickly drop down to dangerous levels. This would be even more so if these cells are standard AA size Nimh which have a high internal resistance and are more subceptible to voltage drop under load. Personally, the only AA's I will use now are enerloops which apparently perform a bit better than most AA when under load. If I'm not using enerloops, I use 2/3 A size cells, which give way better performance than AA with virtually (couple of grams) no weight penalty. Going by the 5v under no load that the original poster quoted, I would guess that he has a duff cell in his pack although, that is just a guess.
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SPC port
I am setting up a glow airplane now and thinking to use the SPC port to supplement the power to the receiver.
Will it be fine to feed power into BAT/6 channel and SPC ports at the same time? The manual doesn't not say anything about using SPC port with glow engine planes. Has anybody done that? Thanks, Sergei |
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Optima Transceiver (RX) - SPC - SPC connection & Lead Detailed plus Optima Current Draw/Amps Optima Transceiver (RX) - Multiple Batteries may be installed Dual batteries for redundancy or even one for each servo. Aurora A9, Spectra Pro & Optima - FAQ & Undocumented Features - Mixes, Setups, Tips. {Individual Links often updated} Regards Alan T. Alan's Hobby, Model & RC FAQ Web Links |
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