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Nov 03, 2015, 10:02 PM
Registered User
Thread OP
Ronaldo you may be onto something.
I ran the motor up like you suggested but without the prop on it though and only to full throttle for a spit second as I don't like running motors that high without a load on them.
As the motor was spinning down to idle I increased the throttle back to about half power
and the motor gave the entire fuselage a torque jolt as it re-engaged.
It made the same sound we heard on the flight but in the flight I was still at idle coming off
the down line.
This may be an intermittent power loss to the motor with power coming suddenly back on.
Having the negative torque prop load on the motor as it was slowing down may have
amplified the sound we heard as the throttle was at idle.
Not sure yet..
Could engine timing cause this too?
After the flight the engine was hot but I could hold my fingers on it.
The ESC was pretty warm too.
It was about 78 degrees air temp at the field.

For those interested- negative torque is when the prop is driving the motor instead of the
motor driving the prop.
In the motorsports world it's called engine braking.
I was a C-130 engine and prop specialist during my six years in the USAF in the 1980's.
The Hamilton Standard propeller system used on the C-130 has a built in safeguard to
handle negative torque situations which could damage the gearbox and possibly
overspeed the Allison T-56 turbine engine.

Hobby People G91 motor and HP 80A ESC (0 min 47 sec)
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Nov 04, 2015, 06:01 AM
Ronaldo Nogueira
ronaldopn's Avatar
I had a similar issue once, it looks like a re-synchroning issue of the ESC. Check the manual and see if you can increase timing, it may help.
One thing I recommend: create a throttle curve on your transmitter so throttle never goes to zero (like an idle for gas or glow).
Every time you bring the throttle stick to zero the ESC has to re-synch with the motor, this takes time and may cause issues like this if the ESC/motor timing is not perfect.
The main benefit of this "electric idle" is instant throttle response, you'll love that (make sure you already have a throttle cut switch).
You can do a quick test by clicking throttle trim up until motor starts spinning smoothly. Check if the noise remains.
Last edited by ronaldopn; Nov 04, 2015 at 07:49 AM.
Nov 06, 2015, 02:07 PM
Registered User
Thread OP
Ronaldo, the idle adjustment took care of all of the torque jolt issues.
She's smooth as glass no matter what I do with the throttle now.
Definitely instant throttle response too.
I'm going to set up all of my electric birds now with a low idle working off the throttle cut switch
Thanks again for the help brother!

We get by with a little help from our friends
Nov 06, 2015, 02:22 PM
Ronaldo Nogueira
ronaldopn's Avatar
That's awesome man!! I'm really glad I could help, that's what these forums are for. Right now I'm enjoying the success which was only accomplished with the great help of friends from another forum. Just came back from the first flight test with a re-wound (by me) brushless motor.
https://www.rcgroups.com/forums/show....php?t=2495946
BTW, love this song too
Nov 06, 2015, 07:15 PM
Altitude is my friend...
Depronicus's Avatar
Quote:
Originally Posted by ronaldopn
...The main benefit of this "electric idle" is instant throttle response, you'll love that (make sure you already have a throttle cut switch)...
Yes, I have a throttle cut switch, but here's my problem with the "electric idle":

I use delicate wood props, and I fly off a very rough, gopher-damaged flying field. I must make dead-stick landings every time. If I would have to flip the throttle cut switch to do that, it means that I would have to find it again and flip it off if I'm coming in too slow and need to apply power to get to the field's very small smoothed runway.

There's no way I would be able to that in the very short time I would have to do it. I would then have to flip it again to make the dead-stick landing.

Yes, I would really like to have the better throttle response you get from power off with the electric idle, but given my conditions, I don't see a way to do it. Any other suggestions?
Nov 06, 2015, 07:53 PM
Ronaldo Nogueira
ronaldopn's Avatar
Quote:
Originally Posted by DesolationAngels
I'm going to set up all of my electric birds now with a low idle working off the throttle cut switch
One thing I forgot, if you have a 3 position switch (or any available switch) use it to set the idle curve. This way you have to flip 2 switches (throttle cut + idle switch) before the prop starts to spin which is a nice safety measure.
Nov 06, 2015, 08:00 PM
Ronaldo Nogueira
ronaldopn's Avatar
Quote:
Originally Posted by Depronicus
Any other suggestions?
Yes, set 2 curves (C0, idle1) and assign them to a switch. C0 has no idle and motor stops when stick is at lowest position, idle1 is your normal flying mode. Before landing flip to C0, if you need to abort a dead stick landing you can power up as normal.
Nov 07, 2015, 12:23 AM
Altitude is my friend...
Depronicus's Avatar
Quote:
Originally Posted by ronaldopn
Yes, set 2 curves...
Nice. That should do it. I'll set them up on one of my planes right away and check it out.
Nov 29, 2015, 10:18 PM
Registered User
dcwwcp's Avatar
awesome thread. I have been looking at getting one of these. the problem I have with pulling the trigger is the lack of parts available.

Anyhow, hey what servo arms did you use ? what size are they? You said you were getting plenty of throw.

Thank you very much in advance.

~don
Nov 30, 2015, 11:12 AM
How low can you go?
buildcrashrepair's Avatar
Quote:
Originally Posted by dcwwcp
awesome thread. I have been looking at getting one of these. the problem I have with pulling the trigger is the lack of parts available.
Same thing here. I have been eyeing one since they came out since I love the corvus.
Dec 02, 2015, 10:40 AM
Registered User
Thread OP
Quote:
Originally Posted by dcwwcp
awesome thread. I have been looking at getting one of these. the problem I have with pulling the trigger is the lack of parts available.

Anyhow, hey what servo arms did you use ? what size are they? You said you were getting plenty of throw.

Thank you very much in advance.

~don
Sorry for the late response Don, just spotted it.
I'm using the stock Savox and Spektrum servo arms that came with the servos.
The aircraft is supplied with long servo arms but I didn't use them yet as I'm just flying sport and pattern right now.
Feb 11, 2016, 09:04 PM
Registered User
Thank you for starting this build thread!! I appreciate seeing the ins and outs of this kit.

Not terrible.......after reading the review of GH, I really didn't want to buy.....was going to go with 3DHS or EF......but the price of admission.....

I ordered this one.....
http://www.generalhobby.com/images/p...ine-red-20.jpg

A friend has the 60" Matt Hall, and that's a decent aircraft

Your build thread tipped the scale

Randy W
Feb 11, 2016, 09:29 PM
Ronaldo Nogueira
ronaldopn's Avatar
Funny that you revived this thread now, Randy as I was revisiting it a few minutes ago too.
I'm really tempted to order one even if I still haven't crashed anything to get space
Feb 11, 2016, 09:40 PM
How low can you go?
buildcrashrepair's Avatar
I also really want one of these It would be pretty ballistic with a Torque 4016t
Feb 12, 2016, 09:05 AM
Ronaldo Nogueira
ronaldopn's Avatar
Well, pulled the trigger and ordered the yellow one.
It was cheap, specially when compared to the price I'll have to pay at home to the wife


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