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marks73
Extreme 3D
Extreme 3D


Joined: 08 Apr 2015
Posts: 86
Location: Leland, NC. USA

PostPosted: Sun Apr 19, 2015 6:38 pm
PostPost subject: Wierd ESC
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I installed an Align 35A ESC in my 450 Pro build I'm doing and when I activated the throttle cut switch the motor ran even though I was at bottom stick. When I look at it in my software it shows about 30% throttle (but my stick is at the bottom).
I have the throttle curve at 0,25,50,75,100 and endpoints all at 100 in normal mode. It's a used esc and I'm going to look at the programming today but my concern is that 30% throttle showing in the software. The programming guide says be sure to have it at zero before programming. Is this just a bad esc?

Update:
The esc is set up as follows
1-Brake disabled 1 beep
2-Electronic timing is set Mid 2 beeps
3-Battery protection set a high cutoff 1 beep
4-Aircraft set to Heli 1, 2 beeps
5-Throttle response speed set to medium speed 2 beeps

I don't want to try to change any settings since they appear to be correct until I can resolve the 30% power issue(if possible)
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Burgess
Extreme 3D
Extreme 3D


Joined: 27 Mar 2012
Posts: 1074
Location: Wales

PostPosted: Sun Apr 19, 2015 11:44 pm
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Hi Mark, did you calibrate the throttle stick to the ESC?

Do the following without the main blades attached.
The ESC should only arm if the throttle stick is in the lowest position when the battery is connected, however, proceed with caution.

Set Throttle Trim all the way down.
Set Sub Trim to ‘00'
Throttle hold Off
Position Throttle Stick at 100%
Connect the Battery
The Esc will emit a warning denoting upper end of the throttle range.
Lower the throttle stick all the way down,
The ESC will emit another warning denoting lower end of the throttle.

Disconnect the battery.
Flip Throttle Hold switch to On.
Now reconnect and the ESC should go through initialisation, now test throttle response to throttle stick movement.



Burgess
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marks73
Extreme 3D
Extreme 3D


Joined: 08 Apr 2015
Posts: 86
Location: Leland, NC. USA

PostPosted: Mon Apr 20, 2015 7:22 pm
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That got it. Where in the mystic world of RC helicopter information do they hide that bit of information?
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Burgess
Extreme 3D
Extreme 3D


Joined: 27 Mar 2012
Posts: 1074
Location: Wales

PostPosted: Mon Apr 20, 2015 9:04 pm
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It's all great fun with RC electronics.
Here's pfd manual for an Align RCE-BL75G ESC (not for your ESC but still useful info).

See page 2 the second section entitled "Set up Mode"
One would think they'd have made that the very first piece of information.

http://www.readytowin.org/Download/Manuali/Align/Align_RCE-BL75G.pdf

Which motor are you going to install what kv, and watts
also pinion size -tooth count.
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marks73
Extreme 3D
Extreme 3D


Joined: 08 Apr 2015
Posts: 86
Location: Leland, NC. USA

PostPosted: Tue Apr 21, 2015 12:12 am
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I'm using an Align Trex 450 RCM-BL450M 3500Kv with a 14 tooth pinion and a 150 gear. I considered using a 121 tooth slant style gear with a 12 tooth slant pinion. Any recommendations will be greatly appreciated.
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admiral
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Extreme 3D


Joined: 20 Mar 2009
Posts: 1100
Location: Brisbane, Australia

PostPosted: Tue Apr 21, 2015 2:49 am
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Hi Mark,
I have a HK 450 Pro V2 with a Turnigy 3500 KV motor and was running 14:150 gears I went to 12:121 and while it flew well, I found the extra couple of hundred rpm head speed intimidating. I dropped to 11:121 and feel a lot happier with it. I always had the feeling that the slightest problem would probably cause it blow apart.
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Burgess
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Joined: 27 Mar 2012
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Location: Wales

PostPosted: Tue Apr 21, 2015 11:33 pm
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Here's a comparison of pinion/main gear, head speeds, and rotor tip speeds, using a fully charged 3 cell LiPO:

450 SEV2 3800kv 11:150....head speed 3160 RPM
450 Sports V2 3400kv 15:150...head speed 3856 RPM

Straight teeth
3500kv 11:150....head speed 2911 RPM, blade tip speed 238 mph
3500kv 12:150....head speed 3175 RPM, blade tip speed 249 mph
3500kv 13:150....head speed 3440 RPM, blade tip speed 249 mph
3500kv 14:150....head speed 4022 RPM, blade tip speed 295 mph

Helical teeth
3500kv 11:121....head speed 3608 RPM, blade tip speed 295 mph
3500kv 14:121....head speed 4592 RPM, blade tip speed 376 mph

12:150 set-up would produce would seem more than adequate for learning.

Ensure the main blades have a nicely defined leading radius, some have a narrow flat right along the leading edge of the blades; this flat may not seem much but the edges top and bottom will create localised airflow separation. Use a fine grade wet-n-dry say about 800 to 1000 grit do this wet with some soap.

Burgess
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marks73
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Joined: 08 Apr 2015
Posts: 86
Location: Leland, NC. USA

PostPosted: Wed Apr 22, 2015 5:18 am
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Wow! Great info. I agree with the 12:150 suggestion since I'm barely beyond hovering experience. . I'll give it a shot. Landing with this unstable Hausler has led to 3 bent tail booms and 1 bent flybar on the last run.
I'm thinking the Hausler was seriously bent somewhere that I haven't discovered yet when it hit the floor on initial power up.
I've been very careful on the pro build and hope to see it produce a much more stable flight.
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marks73
Extreme 3D
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Joined: 08 Apr 2015
Posts: 86
Location: Leland, NC. USA

PostPosted: Fri Apr 24, 2015 9:54 pm
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As far as a gyro goes for this project. I have a gy240 here I was thinking of trying. Any pros or cons?
I'm also watching an Logitech LTG-2100T on Ebay for $70 US
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Burgess
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Joined: 27 Mar 2012
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Location: Wales

PostPosted: Sat Apr 25, 2015 6:55 am
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Futaba GY240 (SMM gyro), the gain (delay) can only be adjusted on the gyro so too switching between Rates and head hold, so not programable from the transmitter.

Rather than that Logitech LTG-2100T on ebay, consider getting an Assan GA-250 (MEMS gyro) for around $10, a great little gyro, all settings are accomplished via the transmitter. I have them on three of my helicopters, two T-rex 450SEV2s and one Walkera 36B they're small, fast, and inexpensive.
available from hobbyking.com

Acronyms
SMM = Silicone Micro Machine.
MEMS = Micro Electro-Mechanical Systems


Burgess
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marks73
Extreme 3D
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Joined: 08 Apr 2015
Posts: 86
Location: Leland, NC. USA

PostPosted: Sat Apr 25, 2015 7:03 pm
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Excellent! I ordered 1 for this build and will probably get another for a trex 250 clone a man gave me. I'm going to let my 12 year old grandson do a main shaft replacement on it (bent) and then show him the set up techniques you've explained to me and see if he gets the bug as well.
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