View Full Version : Spektrum AR7100R Overview and Setup
CNCjunkie
06-10-2008, 10:29 PM
My understanding but please I have not confirmed this yet..... is that a Model Avionics magnet sensor will also work with the AR7100... I am going to get a REAL answer to this at some point but this is what I have heard so if you cant use the crank sensor it appears you might be able to use a Revmax/TJPro sensor....
Bob
Yes, I will wait for the official on that. If the Model Avionics sensor could function as the GV-1 sensor does when pointed at the flywheel on a gas engine, that would work for me, as I'm not a fan of drilling and glueing magnets to the fan hub.
On that note, I'm also wondering if the stator gator would provide the proper signal. Food for thought.
Thanks Bob.
dxtarl
06-10-2008, 11:16 PM
My understanding but please I have not confirmed this yet..... is that a Model Avionics magnet sensor will also work with the AR7100... I am going to get a REAL answer to this at some point but this is what I have heard so if you cant use the crank sensor it appears you might be able to use a Revmax/TJPro sensor....
Bob
Sow does that mean that the crank sensor will work on like a multigov?
VietVet
06-10-2008, 11:31 PM
Finless did a great Job on this AR7100R review.
I did read all of the four posts. My total understanding is limited. And I'll stick with Electric. But for those going up to Nitro, Bob did a great and detailed build video that should save hours for those guys who try to install a AR7100R with a JR X9303.
Keep up the good work.. !
Cheers VietVet :) - :)
torkboy
06-11-2008, 12:03 AM
Sow does that mean that the crank sensor will work on like a multigov?
Should...trying it out tomorrow.
Funky
06-11-2008, 01:43 AM
My Multigov sensor in my 600 is lighting the sensor light in my AR7100R when I rotate the fan. I am not sure if that means it will work since I haven't tried it, but on the bench it looks like the 7100 is reading the Mutligov sensor.
torkboy
06-11-2008, 02:59 AM
Should work the other way around then. Confirming this tomorrow.
Funky-are you going to try the limiter or use your MG? If you use your MG let me know how you did it.
Funky
06-11-2008, 03:24 AM
The sensor that came with the 7100R doesn't fit too good on the Redline in my 600N. I'll need to get some spacers/washers to go between the sensor mount and the motor or it won't fit. For tomorrow, I am going to try to use the built in limiter with my multigov sensor that is already mounted. Ill bring my Multigov too in case I can't get the limiter to work so I can try to bypass it. I don't know if I'll be able to use the bottom plate sensor at all unless I pick up some washers.
I am running a Multigov in my Stratus with a 7100 but it doesn't have the built in Rev limiter and it is just using a standard Multigov sensor. I'll be trying that setup tomorrow too.
Funky
06-11-2008, 03:43 AM
Based on this quick test, it looks like the Multigov will work with the backplate sensor :thumbup:
http://www.helifreak.com/attachment.php?attachmentid=51013&stc=1&d=1213170177
torkboy
06-11-2008, 10:15 AM
Yup Mine worked to, on the Multigov Pro as well.....everything is kosher!
That also means it will work on a Revmax, TJ, and ATG as well ;).
Finless
06-11-2008, 11:32 AM
Cool guys! Good detective work!
Bob
TheBum
06-11-2008, 12:32 PM
Do I see a run on Spektrum backplate sensors on the horizon? I'm assuming they'll be selling replacement sensors. It's sure a lot more protected from damage than the fan sensors.
JodyJ
06-11-2008, 05:57 PM
FYI - Just got back from Gyro Hobbies in Lake Forest, they have a few in stock:YeaBaby:
Nice vids Bob ! Now that i've decided to go nitro i can't get enough info.
P.S. On the 9303 if your adjusting a value and you want its default value just hit the CLR button.
tukkus
06-12-2008, 02:14 PM
Oh boy...I've got lots more ready to do and questions to ask.
Does this mean that magnets are no longer needed if I have the Multigov (V1) and just buy the Spekrum sensor?
creightoncarr
06-13-2008, 01:15 AM
Using the backplate sensor, as I spin the crankshaft by hand slowly, the sensor light on the receiver flashes twice as the rod goes by. I assume its sensing one side of the standoff on the crank for the rod, then the hollow in the middle of the standoff and then the other side. Is this what others are seeing? I would guess that when the engine is running at speed it goes by quickly enough it only registers once each revolution?
Time is relative, what seems very quick to us is a lifetime to a microcontroller.
Finless
06-13-2008, 05:41 AM
Using the backplate sensor, as I spin the crankshaft by hand slowly, the sensor light on the receiver flashes twice as the rod goes by. I assume its sensing one side of the standoff on the crank for the rod, then the hollow in the middle of the standoff and then the other side. Is this what others are seeing? I would guess that when the engine is running at speed it goes by quickly enough it only registers once each revolution?
Turning the unit by hand sometimes you will see an anomaly like this. In fact I have seen the light stay ON and turn off when the crank goes buy. I especially noticed this when first powering up and turning the motor the opposite way! Take a few minutes to rotate the motor a few extra times and this weirdness will go away AND make sure to turn the motor the right diection.
Bob
LoveMyTrex
06-13-2008, 09:57 AM
do you guys know if the backplate sensor will work with the align G600 gov, if so that would be sweet, its my first nitro build and I don't want to fuss about with magnets.
TooLy
06-13-2008, 01:55 PM
Anyone tried to power the reciever with 6V from regulator ?
Does the 5.2V regulator for the tail works ?
I would like to power the AR7100R unit from a 6V regulator and use the 5.2V regulator built in for tha tail.
I afraid it will be too limited.
Finless
06-13-2008, 02:00 PM
Here is what the manual says for power requirements.
IMPORTANT: Do not use a 4-cell 4.8-volt battery to power
the AR7100/AR7100R. Because of the built-in regulator the
AR7100/AR7100R has a minimum recommended operational battery
voltage of 5.5 volts and is designed to use 6-volt 5-cell NiMH,
7.2-volts 7-cell NiMH or 7.4-volt 2-cell LiPo batteries. (Higher
voltage should be used only if the servos are compatible.) While
the AR7100 will continue to operate down to 3.5 volts, the AR7100/
AR7100R features a built-in 5.2-volt regulator for the Rudder, Aux
2, Gear 2, Throttle 2 channels output. A 4-cell 4.8-volt battery will
not provide sufficient head room (voltage margin) to maintain a 5.2
regulated voltage. Regulated outputs are provided to allow the gyro,
gyro gain and throttle to be operated at the necessary lower voltage
while the cyclic servos (aileron, elevator and pitch) are powered
directly by the pack voltage (typically 5-cell 6-volt NiMH or if high
voltage compatible servos are used 2-cell 7.4-volt LiPo batteries).
So yes a 6 volt regulator can be used in front of the RX hooked to the LIPO. Just make sure it is a REGULATED 6V as if it can drop below 5.5 volts it could be a problem.
Bob
TooLy
06-13-2008, 02:09 PM
Good to hear that.
I just found that info from their VR-3 regulator.
Thanks Bob.
LoveMyTrex
06-13-2008, 04:52 PM
you might want to use this badass looking reg from spektrum
http://www.spektrumrc.com/Products/Default.aspx?ProdID=SPMVR6010
Finless
06-13-2008, 08:08 PM
Naaa... that is totally over kill for a heli! It's made for giant scale stuff tha runs WAY more servos than we use...
Bob
torkboy
06-13-2008, 08:13 PM
But it looks soo cool!
I would run one in mine! :P
warpspeed
06-13-2008, 08:26 PM
Wait a minute... are you saying we're going to have to run nimh rx packs? A 2s pack is too much for oh, say a 9452 someone may be planning to run in his oh, say Freya.:thumbup:
Not that it's a big deal to me, but I'm kinda used to my little foil covered fire bombs.