Goose(is dead...)
Heliman
Location: UK
| Fromeco no contest! (Maybe that's a little over the top...)| Quote |
| I´m using the Fromeco Arizona and a 4800 peerless, I can´t speak for the align, but the Fromeco it´s the best I´ve used
An yes the servos for the gyros are meant to work at most 5 V,
Correct me if I´m wrong
Alejandro,
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My Vibe is all JR except for the Gyro and tail servo which is the Futaba 611 combo. It continues to amaze me as I get myself on all sorts of trouble ! but the heading lock doesn't budge. One thing that is - perhaps - not considered in this issue is the difference between the volts & amps drawn by the gyro and servo. For example a JR - 8711 (which has 25kg/cm torque) can draw up to 3.8amps at 6volts. That is a hell of a lot of current. All IMACS run 'Power Boxes' or Expanders so the Rx is not subjected to 10+ digi servos with the potential to draw this amount of current. There is actually another cited element called a colomb which is essentially a packet of energy (I need hardcore Physist to explain it further as I may get it wrong, please help!!). The bottom line is the Futaba gear (on Futaba.com)explicitly stipulate that it can only handle 4.8 volts.
It's interesting how Futaba or JR really never give an explanation as to the intricate workings of the Gyro sensor. Except that the sensor measures the change in the angular velocity, not the physical displacement of the Gyro. At a guess, I'm tipping there are nth number of individual current streams running up a semi-conductor with parallel 'grooves' in it and when a rotation of the heli occurs these energy streams cross over the grooves and the result is sent to the amplifier and the gyro inputs a command to the servo to rectify. (Of possible interest, Futaba and Hi-Tec servos have a Frame Per Second (FPS)rating of 333. JR gyros has 250 FPS inputs. That is why you should never mix the two brands. Although I hear that Master Curtis in bringing out his Gyro will have a switch to define the output FPS.
I run exactly the same setup as Alejandro. The Fromeco regulator is very clever in that it delivers 4.8V to the Gyro and tail servo and delivers a variable voltage (4.8 - 6v)to the rest of the servos.
Admittadly, I have never used an Align but clearly I have no doubt what they offer is top quality.
The major point I like about the Fromco is that if you look at the IC board there are not as many elements and you adjust the variable voltage in a unique fashion - with no pots (which have the potential to fail, in a high load situation.
What is of interest to me is that Scott Grey is one of only a handful of the 'Top Guns' using a LiPo Rx Batt. The Pearless is a Lithium Ion.
I hope I haven't made things more confusing but the bottom line is you need to consider all your electronics and flying style, beit agressive or crusy in order to select the best gear.
I would love if someone could explain the relevance of the colomb measurement - I don't want to post anything I'm not 100% of.
All the best, please let us all know how you go
cheers from Down Under.. |
