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Home✈️Aircraft🚁HelicopterBeginners Corner › Quick EP8 Setup?
05-21-2007 08:41 PM  13 years ago
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kohansey

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Sea Isle City, NJ

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Quick EP8 Setup?
Hello Forum,

I am still a beginner to r/c helicopters. The season for heli flying has come back, so I did a couple of flight tests over the weekend and ran into a couple of power problems, in which, I hope someone here came help me resolve.

My current setup:
Heli: Quick of Japan EP8v2 EX (around 1700 grams fully equipped)
Motor: Hacker A30-8XL, 1100 rpm/kv, 17t Pinion
Controller: Hacker MAS-O-40 Master Series, 40 amps, 2-5 cell lipo
Servos: HiTec HS-81, 0.11 sec/60° @ 4.8V, 0.09 sec/60° @ 6.0V
Receiver: JR R790

Last summer I attempted to fly with a 3s cell 2200 maH li-po battery, and at full throttle, I was only able to achieve enough power to skim across the ground. Because of this, I decide to use a 3s lipo and 2s lipo in series, my ESC can only handle upto 5s lipos. Both 3s and 2s packs are manufacturered from the same company and are both have the same rating of 2200 maH. This worked fine, and I was able to achieve hover speed around half throttle. I have two sets of 5s (3s & 2s) lipos. The first set lipos were hot to the touch after use, which is okay, but I would prefer them not to be so hot. After finishing the first set, I jumped right into the second set. The second set of lipos were extremely hot and the 3s lipo started to balloon after use.

Now my questions:
1. Did I choose the right motor for my heli? Is it too high/low powered?
1a. If it is high/low powered what should I be using (in rpm/kv)?
2. Is is ok to use a 3s lipo in series with a 2s lipo?
3. Am I supplying enough power to the heli with the 5s 2200 maH lipo?
3a. If not, what would someone recommended for a lipo, xSxP xxxx maH (fill in the x)?
4. Would more maH or more voltage have a longer flight time? I current flight time with the 5s 2200 maH lipo is about 10 minutes.
5. Is there anything I can do to prevent the lipos from getting so hot during use?
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05-21-2007 10:40 PM  13 years ago
airboss

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OC ,california

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quik
i had one of those helis and i ran mine on 850kv motor(quik)6s2100 battery and 13 pinion14 pinion 15 pinion.none of these combos were enough.only good for mild 3d 4-5 min.yes you can use 3s and 2s in series and you should balance every time.contact TOMIE (PM him) he helped me set up mine and is QUIK dist.
Urukay HPS3 KSE 700 HPS3
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05-22-2007 04:33 AM  13 years ago
kohansey

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Sea Isle City, NJ

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Battery setup
What about the overheating problem with the batteries? Is it normal for batteries to get hot after a run?
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05-22-2007 12:04 PM  13 years ago
romaink

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Columbia, SC USA

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Quick EP8 Setup
Hot Lipo batteries are not normal. In your case I think you are running the battery down too low. 10 min flight time is too long on 5S 2200mAh especially at that head speed. I get about 5 minutes on my EX with 5S 2100mAh.

If you want longer flight times you will need a larger capacity battery such as 3000 or 4000mAh at 5S. Bigger battery however means more weight which in turn hurts performance of this heli. You might be better off staying with the 2200mAh and living with the shorter flight time.

Get a flight data recorder so can measure power consumption and find out exactly how many mAh you heli is using per minute.

Romain
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05-22-2007 04:45 PM  13 years ago
kohansey

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Sea Isle City, NJ

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If i were to reduce the pinion size, would that reduce the current draw?
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05-22-2007 11:19 PM  13 years ago
romaink

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Columbia, SC USA

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Yes, using a lower number pinion will result in less Amp draw. It will also result in a lower headspeed. If you are not doing any 3D flying you could probably get by with a headspeed as low as 1900rpm.

Try several different size smaller pinions and see.

Romain
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05-24-2007 03:10 AM  13 years ago
kohansey

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Sea Isle City, NJ

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I don't know if anyone knows anything about hacker motors, but I was wondering if this particular hacker was the right choice. When I was looking at the A30 series motors, I noticed that there were 3 choices for the size I wanted, A30-12XL, A30-10XL, and A30-8XL. Now I got the 8XL thinking that is was the more powerful of the three because the rpm/kv was higher than the other two, however, its current draw at lower voltages is much higher than the other two.
For example with 3 lipos:

Motor - Operation - Peak
------------------------------
A30-12XL - 25A - 37A
A30-10XL - 30A - 42A
A39-8XL - 35A - 45A

My question is, did I pick the right size motor for what I am attempting to do (mainly hover)
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05-24-2007 12:13 PM  13 years ago
romaink

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Columbia, SC USA

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Those numbers posted at the Hacker site are the maximum Amps each motor can handle, not a prediction of Amp consumption. Your motor is fine.

If all you are doing is hovering why not buy a large capacity 10C or 15C 5S Lipo say between 4000 and 6000 mAh. You should be able to hover for about 10 minutes without pulling over discharging the battery.
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