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HelicopterAvant RC Avant Aurora - Mostro › FBL e-Aurora w/ Scorpion HK-4525-520LE (lots of pictures)...
01-15-2011 11:37 PM  7 years agoPost 21
OICU812

rrMaster

Edson, Alberta, Canada

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Justin you response was like a love story!

Great you are getting some time in to fly, very jealous of your skimp of snow!

...Once upon a time there were Nitros, flybars and frequency pins...

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01-16-2011 12:17 AM  7 years agoPost 22
yannick

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South Korea

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By my calculations, at 50 volts (12s lipo) this motor is pulling about 1250mAh per minute
This is amazing, mine with the 4035 / 500 has 7 minutes 3D (Soft) and I put back about 4000 mah max, this is 580 mah per minute... half of the 4525 according to your claculation.
The maximum I can pull from the packs (using the 80% rule) is 7000mAh.
This would mean that you are using 8750 mah 12s Pack? I am lost

Am I missing something?

Is it me or this time the ground was higher than last time??

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01-16-2011 12:36 AM  7 years agoPost 23
Justin Stuart (RIP)

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Plano, Texas

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This would mean that you are using 8750 mah 12s Pack? I am lost
I apologize. I had to go back and make a correction to my previous statement. I'm charging the 2 6s packs together in parallel as a single 8800mAh 6s pack, so based upon the output of the charger it appears that I am using 1250mAh per minute--yet this is incorrect.

A more accurate statement would be that on 12S (50 volts) with FAI style flying, I'm using 625mAh per minute.

With my 4035-500, I was pulling closer to 900mAh per minute. Then again, I wasn't doing too much "soft 3D" with the old motor either.

Avant RC
Scorpion Power Systems
Thunder Power RC
Kontronik Drives

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01-21-2011 03:47 PM  6 years agoPost 24
Azlum

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Limington, ME - USA

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It looks great Justin!!

All those pics made me feel like I really need to take pics of mine and post them. I'm going to try to do it this weekend

- Azlum

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01-22-2011 11:58 PM  6 years agoPost 25
Justin Stuart (RIP)

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Plano, Texas

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I flew today what I think is the 30th flight with my re-built e-Aurora and with this new Scorpion 4525 motor in it. I haven't tached it yet, but I think I'm running about 1900 head speed at the moment. I am pushing the helicopter harder and harder with each flight such that with an ambient temperature of 55F, the motor is now coming down somewhat hot (but not so hot that I can't keep my hand on it). I am presently able to get exactly 5.00 minutes of flight time at the 80% rule (with 12S 4400mAh batteries). I am still not running maximum pitch nor am I running the 2100 headspeed which the helicopter seems to like best, but I am certainly finding that this motor has a lot of torque. Having the Jive on "smooth +" does allow the headspeed to decay with pitch pump maneuvers a little bit, but it doesn't decay the same way you get with 30C batteries or with too small a motor. Rather the Jive simply allows the headspeed to drop a little bit when you feed in the pitch and then slowly ramps the rotor disc back up to the governed speed. I think using the "smooth +" setting does a lot to protect potentially vulnerable components of the drivetrain such as the one-way and the main gear. I am very happy with the performance of the motor, with the performance of the Jive, with the performance of the ThunderPower batteries, and with the performance of the helicopter.

Avant RC
Scorpion Power Systems
Thunder Power RC
Kontronik Drives

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01-23-2011 01:43 AM  6 years agoPost 26
Nasscar][

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Delaware

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Can you post a video?

thanks,

Nas,

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01-23-2011 02:00 AM  6 years agoPost 27
Justin Stuart (RIP)

rrMaster

Plano, Texas

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Let me see if I can get someone at the field to record a video for me.

Avant RC
Scorpion Power Systems
Thunder Power RC
Kontronik Drives

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01-31-2011 01:40 AM  6 years agoPost 28
Justin Stuart (RIP)

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Plano, Texas

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I finished flight #37 today on my rebuilt Avant Aurora 90E with the Scorpion HK-4525-520LE motor, V-bar 5.0, Jive 120HV, and ThunderPower 4400mAh 6s lipos.

The helicopter is still performing beautifully without a single problem. I am still getting 5 minute flights. I am not pulling maximum pitch, but I am pulling enough pitch to easily outperform the comparable 90 nitro at the field.

I had to do some routine maintenance on the helicopter today, namely that my horizontal stabilizer had rotated to the side enough that I needed to remove it and remount it. The secret to keeping the horizontal stabilizer on straight is to use double sided servo tape between the stabilizer boom clamp and the boom (thanks Bob00 for the hint).

I oil my Scorpion motor every time I get home with the Scorpion oil, so if this motor works like my other Scorpion motors, I should get several hundred flights before I need to even think about replacing the bearings. Everything else on the helicopter is working flawlessly. No overheating ESC. No vibrations. Nothing but good times. I can't wait until the nice weather returns and I can go fly it again.

For those of you who are curious about what kind of setup you need to fly a 700 electric swapping packs back-to-back without any down time waiting for batteries to charge, take a look at my thread here:

https://rc.runryder.com/helicopter/t629483p1/

Avant RC
Scorpion Power Systems
Thunder Power RC
Kontronik Drives

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02-04-2011 02:15 PM  6 years agoPost 29
Heliosprime

rrApprentice

NY,

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Sweet!

Machete, don't text!

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02-05-2011 03:29 AM  6 years agoPost 30
helicraze

rrElite Veteran

Victoria - Australia

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Hows the one way holding up?

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02-05-2011 03:32 AM  6 years agoPost 31
Justin Stuart (RIP)

rrMaster

Plano, Texas

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I have a one-way that I received from Avant to replace the one-way which came with an early e-Aurora kit and was damaged presumably due to me trying to pull too much pitch too violently. This new one-way is holding up fine so far. However I am not trying to destroy the helicopter. I am being gentle. I have the pitched dialed back to about 85%. I give collective gently. I have the governor on my Jive set to "smooth +". I am pretty sure I could strip out the one-way with this new Scorpion motor if I wanted, but I have not stripped it out yet. If the snow clears, I may push the helicopter a little bit harder, but since the Aurora is the only working helicopter I currently have in my fleet, I really don't want to break anything on it right now (if possible).

Avant RC
Scorpion Power Systems
Thunder Power RC
Kontronik Drives

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02-23-2011 05:19 AM  6 years agoPost 32
kenghock

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Singapore

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Hi Justin
Your use of the DC-UP2 in at begining of the thread got me thinking.

I'm keen to setup a dual redundant BEC to the RX at reasonable cost for my eAurora. Wanted to avoid Rx lipo for hassle reasons.

The only HV BEC that I'm aware of which runs dual BECs is the Dimension Engineering VHVBec. A pair of these supply 9A peak, 6A constant (customer support). However, their low Amp supply had kept me away. I'm not running HV servos, just Savox TGs on 6V.

A DC-UP2 in the circuit could as you explain support the momentary Amp spike without the BECs being overwhelmed This would allow me to safely use the above BEC.

Does the logic make sense? The other question is how many would be needed before weight takes a toll.
2 x VHVBEC = 1.2 Oz
1 x DC-UP2 = 0.9 oz

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02-23-2011 03:33 PM  6 years agoPost 33
Justin Stuart (RIP)

rrMaster

Plano, Texas

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I'm keen to setup a dual redundant BEC to the RX at reasonable cost for my eAurora. Wanted to avoid Rx lipo for hassle reasons.
I personally think a large capacitor bank such as I have described is the superior solution on an electric helicopter. Capacitors are not nearly as resistant to vibration as are other "battery" technologies, but electric helis don't make much vibration so a DC-UP should last a long time.

Besides, the DC-UP is just the right width to fit between the Aurora frames. For your needs, I would choose 2x DC-UP. It is a very neat solution.

As for the weight of the DC-UP, it is not very much. I'm not sure the 0.9oz you list is accurate. It feels like not more than a few grams to me.

The "theme" behind Avant engineering is to do more with less. The airframe is distilled down to its very essence with all of the extra stuff discarded. Why not do the same with your electronics? Getting rid of the separate lipo for the receiver fits with the theme of the helicopter. A capacitor bank is a very elegant solution to the problem of electronics brownouts, and I think fits very nicely with the overall theme of the heli.

Avant RC
Scorpion Power Systems
Thunder Power RC
Kontronik Drives

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02-24-2011 09:07 AM  6 years agoPost 34
kenghock

rrNovice

Singapore

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Thanks Justin, appreciate the advice
Ken

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02-27-2011 12:46 AM  6 years agoPost 35
Nasscar][

rrVeteran

Delaware

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Will the Fromenco DC-UP work with the Western Robotic BEC'?

Nas,

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02-27-2011 04:22 AM  6 years agoPost 36
Justin Stuart (RIP)

rrMaster

Plano, Texas

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Will the Fromenco DC-UP work with the Western Robotic BEC?
While I have not personally tested it with the Western Robotics BEC, I see absolutely no reason why it would not work fine with any BEC.

Avant RC
Scorpion Power Systems
Thunder Power RC
Kontronik Drives

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03-13-2011 06:40 PM  6 years agoPost 37
Justin Stuart (RIP)

rrMaster

Plano, Texas

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I had my first "hiccup" today with my e-Aurora since the rebuild. I think I'm on flight #45 now with the Scorpion HK-4525-520 motor and the new Kontronik Jive 120HV.

I spent the first hour of my day practicing with a high-powered 450. So when I took off with the e-Aurora, I was not as "gentle" as usual. The e-Aurora with 710mm blades has a lot more inertia than does a Trex 450 with 325mm blades. As a result I found myself getting the timing wrong and giving pretty extreme control inputs. But I was having fun and flying the Aurora almost like the 450. Then all-of-a-sudden the blades slowed down a little bit only to speed back up again. I landed immediately. At first I thought maybe I had inadvertently hit the low-voltage cutoff (like I did back in the day when I was first learning to fly electric helicopter). Yet upon landing I found the packs at 3.8V per cell so I don't think that was the problem.

Upon landing I was not able to visualize any flashes on the ESC as there is a piece of Velcro in the way. I don't believe I damaged the one-way bearing so I am ruling that out. On landing, the ESC was not hot at all so I don't think it overheated.

I think I overamped the ESC and as a result the Jive slowed the motor down a little bit. That's all I can think of because the next two flights (with more gentle control inputs) were flawless.

Moral of the story: It seems I can't fly my e-Aurora like I fly my 450 without causing some sort of problem. However with this Scorpion motor, the helicopter will fly (for awhile) like a 450.

Avant RC
Scorpion Power Systems
Thunder Power RC
Kontronik Drives

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03-13-2011 06:51 PM  6 years agoPost 38
Nasscar][

rrVeteran

Delaware

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Justin,

For test purposes why don't you try
Using a CC160HV ESC to see if you have the
Same results

Nas,

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03-13-2011 08:11 PM  6 years agoPost 39
Justin Stuart (RIP)rrMaster - Plano, Texas - My Posts: All  Forum  Topic

It's not worth the hassle for me to swap out ESCs for a single incident of what appears to be an overamp of the speed controller. I will fly the helicopter until something fails, and then assess the cause post-mortem (hopefully following an uneventful forced auto if that is what happens). I am also running a slightly modified set of the V1 frames (which I prefer to use because they offer a nice tight fit for the Kontronik ESC and for the 4400mAh ThunderPower lipos). But since I am flying this smaller frame set, even if I wanted to do an experiment swapping out speed controllers, I'm not even sure I could fit the 160A CC speed controller into the frame. The fact is, this motor can pull in excess of 200 amps. There are people on HF running this same motor in their Henseleits, and they are overamping their Jive 120HV as well. This is a really big motor capable of high amp draw. Supposedly with an overamp, the Jive ESC will only slow down. Other problems cause the ESC to shut off. I believe my ESC just slowed down (which is better than the alternative which is to catch fire). I will hopefully fly it again very soon.

Avant RC
Scorpion Power Systems
Thunder Power RC
Kontronik Drives

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03-13-2011 11:09 PM  6 years agoPost 40
helicraze

rrElite Veteran

Victoria - Australia

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Hi depends on your RPM. If there is any shutdown it will tell you via flashes, there are 3 types, overtemp (soft spool down), overamp (soft spool down), over current (hard cutoff).

I did the overtemp on a very hot day pitch pumping testing the tail (not something you ever worry about when flying) and also when testing the paddle simulation on a fresh pack with vbar. Again 2 things you won't experience normally in flight.

Best to check, if no flashing must be the one way.

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HelicopterAvant RC Avant Aurora - Mostro › FBL e-Aurora w/ Scorpion HK-4525-520LE (lots of pictures)...
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