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Ark › AHAHAH She won't come off the ground!
11-23-2006 04:37 AM  11 years agoPost 1
ru-ready

rrNovice

Tulsa, OK - USA

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Everything I believe is correct! Pitch, Tracking, Radio, Gyro, All is balanced!

I spool it up and she begins to hummmm, and then I get about 1/2 throttle and the battery just falls off fast and power just falls off. I am running the RcExpert 40a esc, and the motor then sent with a 1700 and 1250 3 cell.

The battery is much hotter than I ever got it in my CP!

So is my battery not enough for the ESC or what might be the deal?

Thanks for the help!

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11-23-2006 07:07 AM  11 years agoPost 2
ru-ready

rrNovice

Tulsa, OK - USA

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DUH...
Negitive pitch won't get you very high off the ground... Ok I figured that out but I'm not happy with the servo travel...

Later.

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11-23-2006 02:56 PM  11 years agoPost 3
helimatt

rrElite Veteran

Lafayette, IN

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Hey, I never measured it, but based on flight times I've gotten with my RC Expert motor/esc package, the current draw is fairly high. If you batteries are getting hot, it may be that they cannot handle the current demand (I think you should have at least 12C batteries, 15C better, 20C for heavy 3D). Just spooling up to flight speeds should not get the batteries very warm. Some cells will give a large voltage drop with high current demand, which could be causing the ESC to cut-off due to input voltage dropping. This is designed/programmed into the ESC to avoid damaging the LiPo's by discharging them too low.

Anyhow, keep an eye on it. I think you wouldn't use the 1250 mAh battery for much other than set-up and system checkout. Flying on that battery will give short flight times at best, possible pre-mature motor cut out at worse.

Let us know how it goes!

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11-23-2006 03:54 PM  11 years agoPost 4
Darthdrk

rrVeteran

Munford, Tn

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I fly 1200-1300 3s batteries on my BCP/HBCP2. If the battery is getting hot you may want to discontinue use. The battery wont last long. for the 400 size helis you should be up in the 2000-2200 range of batteries 3s 11.1v. You also want to go with a battery with a C-rating 15C and up.
Using a small battery like those will quickly become unbalanced and die.(Learned from experience) I got a brand new 1800 MAH packThat now has a dead cell because it was used on a 400 size heli. It might have 10 charges on it now only reads about 8 volts. Even using a balance charger and a low charge rate wouldnt bring this one back. (Could be a cheap pack also)

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11-23-2006 05:21 PM  11 years agoPost 5
ru-ready

rrNovice

Tulsa, OK - USA

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Wow...
Ok things are better. I now have hovered for the frist time and things are holding very steady. But only about 3 minutes of run time, and 1 minute of flight on a 1250 3 cell!

One thing also is about 4 feet off the ground it gliches and I have to set it down.

Hopefully the 1700 will give me a little more time. I might be getting some stronger commonsence batteries.

Thanks all.

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11-23-2006 07:31 PM  11 years agoPost 6
BikeNBoatN

rrVeteran

Santa Ana, CA USA

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I wish HeliMax would change the labeling on the MX400 box that recommends using a 1320mah battery. That's way too small for a 400-size heli like the MX. Like other posters have said, a 1320 is a BladeCP-sized battery. 1800 is about as small as I'd go. I have several 2100's that give about 6-7 minutes of sport flying time.

Glitches....how do you have your electronics arranged? You want to keep the motor and esc as far away as possible from the rx and gyro. I have my esc strapped to the right front side of my frame, near the lipo. The rx is strapped to the left rear side of the frame, about as far away from the esc as possible. My GY240 is between the rear frame rails, under the boom mount, safe from flybar strikes.

What rx are you using? Many people, including myself, have encountered glitches with a Hitec Electron6 rx. Do you have a ferrite ring on the esc wires?

Brent
Slow and Smooth 2-D Scale Flyer
AMA #35431

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11-24-2006 03:21 AM  11 years agoPost 7
eyeflyhelis

rrElite Veteran

charlotte nc

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a pack that new can be save you need to charge each cell seperately with a lipo charger that has no cut off and only charge it for a short time (long enough to c you 3v back. then stick it on a good cahrger and a balancer-
this is from experiance
cheap charger like a walkera would be great & cut the connector and mod it to be ablie to charge only 1 cell

only you have the power to make no difference!

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11-24-2006 02:42 PM  11 years agoPost 8
ru-ready

rrNovice

Tulsa, OK - USA

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Thanks to everyone!
Looks like I need some bigger batteries!!!!

Love the sound of these heli's...

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11-27-2006 01:20 AM  11 years agoPost 9
ru-ready

rrNovice

Tulsa, OK - USA

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Hey new question
What should my throttle and pitch curves be? I have an Airtronics RD 6000 Super so I have 5 points available.

Thanks.

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11-27-2006 02:09 AM  11 years agoPost 10
helimatt

rrElite Veteran

Lafayette, IN

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I don't have an Airtronics, but my Futaba also has 5 points. For normal mode, have the throttle straight line from 0 to 100%, and start with pitch at 45, 45, 50, 75, 100. The slight negative pitch will help keep the heli planted as you shut down if it is breezy. You can tailor this to help the pitch not be too sensitive in hover after you have some flights.

Idle 1, throttle 100, 85, 70, 85, 100, and pitch straight line 0 to 100. (at 50, mid point, your pitch should measure 0°). Idle 2 could be more aggressive on the throttle 100, 95, 90, 95, 100; pitch same as Idle 1. Becareful that your setup of motor/esc/battery and blades won't overspeed the head or tail at flat pitch and 90% throttle

I don't have a ton of experience, so others may have better insight, but I've settled on these settings for my X400 and like them very much.

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11-29-2006 03:09 PM  11 years agoPost 11
ru-ready

rrNovice

Tulsa, OK - USA

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Again... Thanks.
Adjusted pitch points: Free
Adjusted throttle points: Free
Changed placement of ESC and Receiver: $11 Servo extensions
Upgraded to a Align tail slider: $12 (A must have)

Stable hover in garage after dark: PRICELESS

Thank you all for your help.

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