EagleTree Advise

[Cralis]

Hi guys,

I got my EagleTree today. I also got:


Temp Sensor X 2
Optical RPM Sensor
LCD Display
Engine Temp Sensor (Loop)Now, I have ideas on placement thanks to you guys. Phoinix - thanks.

Now, setup.

I'm still learning about the electrics of a heli. So, I'll have a few questions in this thread. Can I start with this one: How is the best way to setup the panel to display details about how much you have used on your packs? I hear it's good at being used as a fuel guage. So, what do I need it to display in order to be able to say, 'Ah, time to stop!'? And what would it be showing me?

Attached, some shots of my current settings... but, would like some advise on what I should be showing, on the panel AND the PC.

[mysticmead]

I don't have one (yet) but, looking at the second screen, include cumulative Mah, that should be what you're looking for. it will show how much you have used out of the batteries.

[GatoVolador]

Correct. I think you should have gone for the brushless motor sensor instead of the optical one though -- much easier to setup. Somehow everyone thinks it's harder to setup but it's not (in fact it's probably easier) -- you just connect it to any two motor wires. You then tell the software how many poles your motor has and your final gear reduction ratio. With the optical sensor you have to worry about where to best place the sensor to get an accurate reading, gluing it on, etc.

[mjdee14]

Your also going to find you will like the 2D graph better than the gauges.

The gauges run the whole flight and although it's fun in the beginning, the graph shows the whole flight and you can change it severl times to read whatever you want....

You are going to love it....and Ihope you got the display panel....because you stick that on the side of the heli and it's a perfect "gas gauge"...shows how many mAh used..and you can fly to the max...

[mysticmead]

think I'm gonna tell my wife/kids/dad/sisters/brother that I want an eagle tree for my birthday this year :D

[Cralis]

Thanks guys. OK, so I must use the cumulative MaH to get (an accurate?) reading of how much I am draining from the packs, right? So, lets say I am flying with 2 * 2200mah 25C 3Cell packs.. would I be happy to and when the cumulative MaH reads say, 1760 (80%)? Or do you double it (2 packs)?

People have mentioned the brushless sensor. Maybe I should have gone for it, but to me, painting the main gear and then attaching the sensor where Phenix has his placed - seems simple, enough no? No working with wires and stuff. Just not sure how to work out the ratio....

mjdee14, I did get the panel.. Hope it's at least a WEE bit crash proof!? :)

[Phoinix]

Hey Cralis,

1760 is correct for 80% capacity on your 2x 3S1P.

I have also brushless RPM sensor and the one thing that bothers me the most is, it shows motor rpm and calculates headspeed. When do you want your head speed to be read as an actual reading? Well, try practicing autorotations, and tell me what was the lowest RPM, and at what stages should i be carefull. With brushless RPM sensor, it's going to read 0. If your one way bearing is slipping, you will know that. Not with brushless sensor you're not...

The ratio you have to enter is for calculation of motor RPM from head speed. It's the other way around with brushless RPM sensor.

You can calculate your ratio like that (14T motor pinnion, 42T FWD gear, 20T one way and 61T AFT gear):
(42/14) * (61/20) = 9,15 :1

Thus you enter 9,15 as your ratio. Change the numbers to fit your setup.

[Cralis]

Thanks again! I am not sure of my other gears, but I have a 13T pinion. Going to be a mission counting the teeth.... But looking forward to getting it all working....

[mjdee14]

Just not sure how to work out the ratio....

mjdee14, I did get the panel.. Hope it's at least a WEE bit crash proof!? :)

The ratio with the optical should be 1 : 1 since every revolution of the gear is one revolution of the blades.

Mount the panel up as high as possible....and don't crash !!:thumbup:

[Cralis]

Of course.. one revolution of the main gear is one revolution of the head. :arggg:

hehe

And yeah, thanks for the 'don't crash' one. :) Never thought of that either! :YeaBaby:

[mjdee14]

Hey Cralis,

1760 is correct for 80% capacity on your 2x 3S1P.

I have also brushless RPM sensor and the one thing that bothers me the most is, it shows motor rpm and calculates headspeed. When do you want your head speed to be read as an actual reading? Well, try practicing autorotations, and tell me what was the lowest RPM, and at what stages should i be carefull. With brushless RPM sensor, it's going to read 0. If your one way bearing is slipping, you will know that. Not with brushless sensor you're not...

.

I need to check but I believe Eagle tree came out with a software update that lets you have more than one speed sensor....so you could the brushless and the optical....

Would be good to see if they both were reading the same....I tried both butthe optical had glitches in the readings....so I went back to the Brushless. The PIA about the brushless I kept forgetting to change the ratio in the program when changing pinions or OWB and had all bogus readings till I did. :arggg:

[worldofmaya]

Hi... no they didn't... but of course you can use it if they're the same type and you reconnect some cables on your sensor. Have a look at their forum at rcgroups.com. I think they'll announce an update if available there... I'm also waiting for this update to use my brushless and optical sensor.
-> http://www.rcgroups.com/forums/showpost.php?p=9479945&postcount=10
-klaus

[bugdozer]

The brush-less sensor works very well but is not too accurate if you just enter you gearing ratio. I run mine up on the ground with an optical tach and get a good RPM reading. Then I download the info from the E-Logger and tweak the ratio settings in the software until the RPM's on the graph match what I read on the optical tach. You only have to do this one time unless you change you gearing then the brush-less sensor is very accurate.

I also calibrated the voltage and current on the logger on my T-Rex but have not do it on my Hurri. I may get around to it soon but is was quite close in default from EagleTree.

[Madedon]

Thanks guys. OK, so I must use the cumulative MaH to get (an accurate?) reading of how much I am draining from the packs, right? So, lets say I am flying with 2 * 2200mah 25C 3Cell packs.. would I be happy to and when the cumulative MaH reads say, 1760 (80%)? Or do you double it (2 packs)?

People have mentioned the brushless sensor. Maybe I should have gone for it, but to me, painting the main gear and then attaching the sensor where Phenix has his placed - seems simple, enough no? No working with wires and stuff. Just not sure how to work out the ratio....

mjdee14, I did get the panel.. Hope it's at least a WEE bit crash proof!? :)

Last weekend I had a major crash as I was taking a tight left turn I ve lost the orintation and hit the ground really hard. I had to replease almost all the head parts broken speed Controler, Blades, canopy etc. Nothing happen to the display.

Anyway I have
Brushless RPM Sensor
LCD Display
Engine Temp Sensor (Loop)

Please see pictures attached my setup

46802

46803