Idle Hands Do The Devils Work

[Russ McC]

Scoty,

I don’t know the shaft size. I don’t know the other gears either. Rob (Helirob) counted them all the other day maybe he will tell us, he did say the final ratio was 20.8 to 1 I think, making the motor rpm 41600 at 2000 on the head. :)

[Tom Fiddler]

Russ don't forget to mix that tail rotor in too.
ESC's governors are limited at this time as they are reactive and not proactive
You will soon see ESC's with 2 inputs one for headspeeds and one for throttle curves.
I can tell you from my testing of the GV-1 that it does read the throttle curve and opens the throttle as soon as you move the stick, but I'm about the only one in the country that knows that :D

[Russ McC]

I was thinking of mixing in the tail also. Yes the governor mode on the ESC does not work well so it is not being used. I also know that you are correct that the GV-1 is looking at the throttle position/curve; I have investigated this a tad bit also :)

[Tom Fiddler]

Well that makes 2 people who know. :D :D :D
I mentioned this before and people said if that were true Futaba would have mentioned in the manual.
They don't know Futaba very well! :shock:
I had a GV-1 on my leaf blower and learned alot :lol:

I'm out there.....and loving it!!!!

[carey shurley]

Gee I gotta ask this:

If the GV1 was NOT reading the throttle curve, how would it operate? There are a number of functions that REQUIRE knowing the current throttle position from the Tx to work at all.

I must be missing something.

[ChrisS]

Just a few words of caution guys: watch those speed control temps, as you (or the GV-1) drop the percentages down, especially during hard maneuvering, the conntrol will heat up. It WILL protect itself, by shutting down. This will not occure untill it gets pretty warm, but that happens quickly once you get past a certain point...kind of a thermal run away.

Chris

[Shannon Davis]

the sec. gears are 15/52 if I remember correctly.

Sorry for the delayed responce- I got a little sick yesterday and went to bed at 6:00pm :shock:


Also, do watch the ESC temp. I started this little exp. by checkig the head speed at 0 deg @ 60% throttle. It was around 1570-1600. I have my lowest HS on the GV-1 at 1650rpm. So far temps seem fine after a few minutes of hovering at 1650. I also tried 1600 w/ no problem. I haven't seen the temp over 105f yet but it was only in the low 70's here this weekend.

[misskimo]

hey , yep , better watch that , below 80 % is a no no in my own little rule book , like Chris says , thermal shut down comes quickly once you do alittle acro , reason why , voltage is low and amps rise , voltage high , amps are low which heat is genarated with amps , if it stays in that sweet spot like Chris designed to run at with the gearing then both even out just right , Alot of the fellows on ezone run theres at 100 gov mod , and get cooler temps and longer run times , thats with the gov on the esc . but I dont know what it will do with the ion , I run my fury conversion at 100% though , basic flying around though and temps are stable , 14 min. at 100% , but soon I will see what this bird will do with someone at the sticks other than ME :oops: with this kind of HV setup . I do have a 32-3 coming and 2 sets of 13s3ps new gen cells , with the 32-3 I can go with 10s3p if the heat rises to much , the schulze dont care one bit about the high voltage , its under 100 f .


Tony

[misskimo]

also , I have a tempest head Im about to put on my heli Chris , what do you think about how it acts ? I sure like it , and since I cant do all that fancy upside down, tumbling, flipping , rolling , ticktocking , slinging out of control incontrol flying , maybe it will fit me huh?



Tony

[ChrisS]

Tony
Try that head, you'll love it. It makes the heli feel like it's on rails when your flying across the sky...like a plane as Cliff says. For most it can be setup plenty fast for 3D use too.
Chris

P.S. I guess I should have chimed in a little sooner, the gears are 52/15 and 90/15 for 20.8:1.

[ScotY]

Thanks for the gear info, guys. Chris, what's the diameter of the counter gear shaft? Are both of those 15T pinions interchangable (i.e same part number)?

[ChrisS]

Hi Scot
No, the shafts are different, motor pinion is a 5mm and layshaft is 6mm.
Chris

[bob00]

Thanks for the gearing info guys.

Shannon - Any more GV-1 sensor mounting pictures? I'd like to benefit from your research (actually I'm just plan lazy and want to copy what you did :mrgreen: )

- Rob

[GGoodrum]

I'm not sure how the GV-1s and or TJ operate (never had a gasser, proud to say! :D), but for all the ESC governors, the only input IS the TCs. It does "know" what the motor rpm is but Tom is right, all are pretty much reactive. There has been an ongoing discussion on eZone about this, and some tests have been done with adding a TJ to a Joker.

Until ESC controllers add an input for an optical sensor mounted to read rotor speed, somehow, I suspect performance will not improve much. I'm not sure why this is, however, because as I understand how the GV-1/TJ work, the sensor monitors motor rpm. All brushless motor ESCs have to know where the stator is at any given moment, which means they also know motor rpm. You would think then, that "better" software would be able to do a better job of "anticipating" load requirements. Interesting stuff!

[Shannon Davis]

I don't know about all of the technical stuff- but I sure like my Ion-X, especially w/ a GV-1 on it. :P I seem to be getting much longer run times- like 20 mins. w/ the last 5-8 at a 1600 rpm hover. Haven't fully drained the batts since the first flight :shock: , so I really don't have a true time till dead yet. I will try to do some controlled testing this weekend. I will post the results.

[Shannon Davis]

bob00- what other pics would you like??

[bob00]

More showing how the sensor's mounted.

- Seems you were able to use an existing frame screw. Did you have to make any additional holes?
- There seems to be a metal plate sandwiching the sensor to the plate - curious about this too
- What's the wire tie for?

Lots of questions - I'm still waiting for my kit to show up and want the build to go REAL fast when it arrives.

One or 2 more pictures of the sensor assembly should make things really clear.
Thanks man, appreciate it.
- Rob

[Shannon Davis]

No new holes in the frame-- I did have to slot the sensor a little more to get it to clear the gear. The plate is the GV-1's 30 size bracket- I used it to strengthen the mount. I was afraid the single screw would not hold and if I tightened it more it would split the sensor.

I always wrap my sensors w/ safety wire- it keeps them from falling apart. The sensors have a prob. w/ thw case coming apart.

[bob00]

Got it - thanks.

We use heatshrink to keep the sensor together. Never figured out why Futaba chose to just snap the sensor halves together instead of using glue or molding the whole thing as one piece.

Thanks again,
- Rob

[Ed]

Noticed that these posts were from the end of April, first of May. Any update on using the GV-1 on the Ion? Any problems with the controller overheating at slower headspeeds, say around 1650? I am a sport flier and just finished my Ion. First time up and the headspeed was way too high for my liking. Would like to use a GV-1 as I have them on all 3 of my glow helis if no one using them has had any overheating problems. Thanks for the help.
Ed