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Esprit Model . Thunder Power RC . Real Raptors

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Radio - Servo - Gyro - Gov - Batt > MultiGov Pro with Spektrum Backplate Sensor
 
 
ErichF
Key Veteran
Location: Odessa, FL 33556 (Tampa Area)

I heard a rumor that the new back plate sensor will work with the Multigov.

1, is this true, and
2, has anyone been able to get the new sensor yet?

I just got a MGP on the way, and expect to have this unit in place on my Caliber 90 for the Nats.

Also, 12Z-12FG owners with the MGP...what's your setup? Is it fairly similar to a GV-1? I expect to still be able to trim the RPM from the TX like I do my GV-1.
06-24-2008 02:52 AM
 
 
tchavei
rrProfessor
Location: Portugal

AR7100 uses revmax
revmax sensor is 100% compatible with multigov
So one can assume that the ar7100 sensor is compatible with the multigov.

On another thread someone hooked up the sensor on a multigov and it appeared to work on the bench.

If the sensor will endure and prove reliable in the real world is another story. Give it 3-6 months and only then change.

Tony


--------------------
"Perfection and patience usually walk side by side..."
06-24-2008 03:33 AM
HOMEPAGE  
 
 
Zaneman007
Key Veteran
Location: Texas - USA

Although I don't have the multigov pro, you don't need to trim the RPM with the multigov. You set the RPM to the speed you want, say 1950rpm. The RPM is set and your done.

I'd rather be flying
06-24-2008 03:40 AM
 
 
Jason Bell
Elite Veteran
Location: San Diego, Ca

Erich,

Yes it will work, but when mounted up against the case of a YS91SR the sensor will pick up the crank pin twice, and needs to be backed down a tad bit. This is because the YS has a bigger crank pin diameter I believe. With an OS it works fine flush.

Team Avant
Team ElyQ
Flight Power USA
Aerospire
Vblades
06-24-2008 05:02 AM
HOMEPAGE  
 
 
ErichF
Key Veteran
Location: Odessa, FL 33556 (Tampa Area)

Zaneman:

Quote 
Although I don't have the multigov pro, you don't need to trim the RPM with the multigov. You set the RPM to the speed you want, say 1950rpm. The RPM is set and your done.

Sorry, Zane, you don't understand what I mean. Sometimes when performing the hovering manuevers in a contest schedule, it's nice to trim your RPM for the best feel given the conditions. Setting and forgeting RPMs in the governor is what I used to do before I got a 12FG. Now, I can adjust my rpms +/-200 rpm either way in hover by a simple turn of a knob, without having to re-set the governor. I found this to be a great advantage to up the RPM in gusty conditions, and lower the rpm for calm/no wind flights, without having to preset a bunch of flight modes. Right now, I only use three flight modes, Normal (startup), Idle-1 at 1430 (hovering), and Idle-2 at 1950 (upstairs aerobatics).

This is what I meant by trimming RPM.
06-24-2008 12:31 PM
 
 
ErichF
Key Veteran
Location: Odessa, FL 33556 (Tampa Area)

Jason:

Thanks for that tidbit... If/when I can get one of those sensors, I will be sure to pull it back a ways from the backplate as you suggest. What's the minimum sensor value the MGP accepts?
06-24-2008 12:33 PM
 
 
JKos
Elite Veteran
Location: City of California in the state of Maryland

> What's the minimum sensor value the MGP accepts?

There won't be a useful "sensor value" associated with the new Spektrum sensor as the output of the sensor is a logic level signal... either high or low. Back the sensor off just enough to eliminate the double detect. You also have to turn the crank several times for the sensor to "learn" before it will give an output.

- John

Protos -- Logo 10
06-24-2008 03:16 PM
 
 
Andy from Sandy
Veteran
Location: UK

Unless the MGP has been changed from how the V2 works you cannot set the RPM from the TX like you can with say a Revlock or TJ Pro. The 3 speeds are set using the LCD panel and then you select which speed you want to use from your TX.

ErichF, I know what you want to do but I don't think the MultiGov does it.
06-25-2008 05:49 PM
 
 
ErichF
Key Veteran
Location: Odessa, FL 33556 (Tampa Area)

OK then, well I guess I'll find out for sure, soon enough. I can live with it...I've been flying like that for three years with my 9303, so no biggy if it don't trim RPM.
06-25-2008 07:36 PM
 
 
tchavei
rrProfessor
Location: Portugal

Eric, you will like it. I promise.

I was a hardnecked user of other systems mentioned in this thread until I started to get picky on little issues I didn't like. For example some governors although they keep the rpm steady are too "mean" to the engine. They will overshoot, realise the mistake, close the carb even further etc etc. In practical terms you will feel and hear a hick during disc unloading phases. This is specially true for YS engines that don't like being told what to do.

One REALLY nice feature of the Multigov that I appreciate VERY much is the forward read feature. Imagine this:

You enter a tight loop with poor collective management. The engine starts to bogg. A normal governor detects this and will open the throttle further. However, you've now at the top of the loop and you reduce pitch. At this precise moment the rotordisc will overshoot target rpm because a) you reduced the load and b) the governor opened the throttle fully because the engine was bogging.

Now lets imagine the same situation with the multigov:

You enter the same tight loop and your engine starts to bog. The multigov will try to compensate by opening throttle BUT as you've reached the top of the loop and reduced the pitch, the multigov will think "hey, engine is under target rpm but the guy down there just reduced pitch so lets not lets not be too agressive because God knows what that guy is trying to do". The result is that the MG will open the throttle just enough and just right to keep head rpm with minimum overshooting.

Now lets imagine a different scenario... you started to bog the engine right when you entered the loop (keep in mind that the multigov reacts in miliseconds). The MG will detect the bogging but it also "sees" that you're jamming the pitch stick so it thinks "Engine is bogging, the guy down there is jamming the stick forward, this is going to get bad, lets open the throttle fully and hope he has strong engine"

So basically the whole thing of the "read forward" is to try to antecipate rpm drops that will happen a few miliseconds later and generally optimise the whole thing. Obiviously there are limits and its impossible to predict everything accurately but in a scale from 1 to 10 I would give the MG a 9

Hope that clears some things up

Tony

PS - Thats one of the reasons one should follow the manual and use a 100-80-100 curve for 3D. A flat 100 line will make the feed forward feature useless as the multigov will always "see" a full forward stick. It will still try to keep rpm steady but will overshoot easier than with the suggested curve


--------------------
"Perfection and patience usually walk side by side..."
06-25-2008 08:06 PM
HOMEPAGE  
 
 
ErichF
Key Veteran
Location: Odessa, FL 33556 (Tampa Area)

Tony, that was a fun read!

I, too, have witnessed what you say about "mean" governors. I think the RevLock or TJ are like that. I can tell when someone goes into Idle-up, cause the throttle just jams into high speed instantly. One of the best things about the GV-1 is it's smooth, steady throttle take-over. It's very much like the smooth start on a good ESC, as long as your throttle is in the ballpark of the target rpm. Obviously, you can't be at idle and flip to Idle-2 and not burn out your clutch...but it does a good throttle take-up, once you're spooled up.

Is this similar to your experience with the MGP?
06-25-2008 08:13 PM
 
 
JKos
Elite Veteran
Location: City of California in the state of Maryland

> The MG will detect the bogging but it also "sees" that you're
> jamming the pitch stick

How does the MG Pro know what you are doing with the pitch? It is connected to the throttle channel and thus only knows what the throttle curve is doing. Other products also make use of the throttle curve. But you are saying the MG Pro is somehow different in its use of the throttle information, right?

Thanks,
John

Protos -- Logo 10
06-25-2008 08:14 PM
 
 
Jason Bell
Elite Veteran
Location: San Diego, Ca

Yes the multigov has a touch of a delay before your headspeed builds up to its set value.

Tony, that was pretty funny!

Team Avant
Team ElyQ
Flight Power USA
Aerospire
Vblades
06-25-2008 08:17 PM
HOMEPAGE  
 
 
tchavei
rrProfessor
Location: Portugal

Jkos: I edited my post. Thats why Aerospire recommends a throttle curve. Its interesting when you start experimenting with the feed forward values (you can do that in the advanced menu). The lower the feed, the more the governor ignores where your stick is and behaves like other governors. The more feed you have the more it will try to predict what will happen to the rpm based on your stick position. However, too much feed and it will start working more on curves than trying to keep rpm under control.

Tony

EDit: JKos... the "other governors" that say that read the throttle curve don't do it in fact. One curious detail is that if you search old RR posts, Colin Mill assured that the revlock 10 would read the curves and try to predict but a few weeks later the "talk" changed as csm started to defend that it didn't matter how you had setup the throttle curve because the revlock would ignore them. YOu only should have a good throttle curve in case the revlock failed.


--------------------
"Perfection and patience usually walk side by side..."
06-25-2008 08:19 PM
HOMEPAGE  
 
 
JKos
Elite Veteran
Location: City of California in the state of Maryland

> the "other governors" that say that read the throttle curve don't
> do it in fact.

The TJ Pro certainly does read the throttle curve. It was also proven that the GV-1 reacts to the throttle curve. Anyways, it sounds like the user has more control of it with the MG Pro and that should certainly help.

- John

Protos -- Logo 10
06-25-2008 08:39 PM
 
 
tchavei
rrProfessor
Location: Portugal

I should have said "some of the others"

Tony


--------------------
"Perfection and patience usually walk side by side..."
06-25-2008 08:45 PM
HOMEPAGE  
 
 
1 page338 viewsPOST REPLY
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Radio - Servo - Gyro - Gov - Batt > MultiGov Pro with Spektrum Backplate Sensor
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