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Gohbee Aviation Stinger 30-90 > My Phazor 600 build progress
 
 
ddierking
Senior Heliman
Location: O'Fallon, MO - USA

I got her in the air today, not really, but I did get the Predator Condor in the air today. The weather has been pretty crappy around here lately. We had a break in the the weather long enough for me to get the yard mowed and a couple test flights in on my new Condor. I did program the CC85 the other night and set the blade pitch. Did you guys use the same settings and techniques that finless did to setup the CC85?

Dan Dierking
05-11-2008 12:48 AM
HOMEPAGE  
 
 
centuryman
Veteran
Location: deerriver,mn usa

same technics,slightly different settings.
I beleive I'm useing 59% govener gain,on high govener mode.
And 21 volts on cutoff.Just be carefull if you set your cutoff below 2.9 volts per cell.as you can take your battery past 80% and damage it.but set at 2.9 volts per witch would be 23.8 you can hiut the soft cut when doing hard manuvers.I've talked to some guys who run theres at 12 volts to prevent this.
The reason i run mine lower is because i have a a123 pack for it and it requires a lower cutoff.
I talked to clint akins about the throttle settings and he said you can run a little above 85%,but not much. your goal is 80 to 85%.
05-11-2008 03:05 AM
 
 
litespeed600
Senior Heliman
Location: St. Charles, Missouri

Quote 
And 21 volts on cutoff.Just be carefull if you set your cutoff below 2.9 volts per cell.as you can take your battery past 80% and damage it.but set at 2.9 volts per witch would be 23.8 you can hiut the soft cut when doing hard manuvers.I've talked to some guys who run theres at 12 volts to prevent this.

No offence but NEVER use a low voltage cut off on a electric heli!

That is horrible advice! Again I'm sorry to point this out at you but non the less bad advice.

Why would you take a chance on loosing an entire heli to the power being cut off. It would be bad enough to loose a pack but the whole heli? Either turn it off or set it to the lowest voltage setting possible. You should always time your flights starting at 5 mins (on a new heli or power system that you haven't flown!) and keep going up. Less if you think that is too much. When you charge see how much you but back, if it's under 80% then fly longer next time till you get to the 80% mark in steps. Min at a time till you get close to 80%. Guessing is bad here! Then just always set the timer on the TX.

Enjoy your heli's guys!

Tom

I'm married so you know I am no stranger to pain!
05-17-2008 08:16 PM
 
 
centuryman
Veteran
Location: deerriver,mn usa

you ever heard of soft cut and or autoing in?

I use the same system to find my flight times and used to turn off the voltage cuttoff untill i had a couple times where I pushed it harder then normal and use up your battery faster.I've come close to ruining some $400.00 batteries doing that,I've seen as high as 180 on battery temps.So since then i use the soft cut and if need be auto it in.
I've only had 1 very minor crash from a scewed up auto on a soft cut.

The worst crash i've ever had was still half the price of a $400.00 lipo.
Then there's always the possibility of catching your pack on fire from over discharge,and i've been told that they burn at 3,000 degrees , and will most likely destroy you're whole heli.

Way i see it it's all a matter of what you worry about more,crashing or you're battery.
For me it's a $400.00 battery, for some that are not comfortable with autoing it would be crashing.
05-17-2008 10:34 PM
 
 
litespeed600
Senior Heliman
Location: St. Charles, Missouri

Ever heard of soft cut inverted at 2 feet off the ground? What are the odds your going to be 30+ feet off the ground and facing into the wind whilst the soft-cut kicks in. Wanna place some odds on that statement?

You posted you use a123's batteries so 400 bux worth would be a 12s3p or a 18s2p pack I guess with a few left over?

If you packs are getting that hot after a flight that you just "flew a bit harder" then there are a couple things wrong with your set-up. You are prolly over geared or under powered. If you hit 180 flying a bit harder than normal you have to be hitting quite a bit over 140 normally unless your comparing a normal flight of FFF and flying a bit harder as stick banging 3D.

Comparing to burning you lipos and 3000 degree burn then your really way off on gearing or power. There are many rules to obey whilst setting up an electric heli. I just can't imagine your that "close" to the edge of a melt down.

My whole point was to time your flights, period. Voltage cutoff has no place in a helicopter, period. If you normally run 8 mins of sport flight and today you want to try some stick banging amp eating tic tocks then maybe common sense would prevail and we would limit our flight to 5 mins?

Common sense is the key and I have had my share of leaving mine at home when I went to the field. I don't wish that apon another.

Tom

I'm married so you know I am no stranger to pain!
05-18-2008 07:58 PM
 
 
centuryman
Veteran
Location: deerriver,mn usa

You got me on the inverted hover thing.Although there are pilots that could pull that off.I'm not one of them of course

I run A123 packs in only one of my 600e heli's and they never over heat.

As for lipos overheating, it has to do with running past 80% on your battery.I normaly gear my helis to run 120 to 130 degrees during a normal flight.

I am very carefull with timeing my flights and keeping in the 80% rule but OCASIONALLY i have left my commensense at home and gotten carried away with out realizeing it and used up my batteries befor my timer went off.Some times you just get on a roll and it just happens.Any ways the soft cut saves me from damaging some very expensive batteries in that case.

Me thinks that if you need to remove your voltage cutoff then maybye YOUR setup is faulty.

Or you are one hell of a pilot,Personally i have only had the low voltage cut kick in a couple of times prematurelly and that was due to batteries not up to temp yet, and as soon as i zeroed the pitch they came back and i continued on.

Another rule i imploy is to keep the heli in a good autoing positoin near the end of the battery,just in case.Witch only means upright and with in a couple hundred feet of a landing spot.
05-19-2008 04:32 AM
 
 
litespeed600
Senior Heliman
Location: St. Charles, Missouri

Some of the other issues with the LVCO are developing a bad sell during flight, loosing a wind on a motor where amp draw gets exssesive for just a few second or running concurrent flights with a hot system which isn't quite as effecient as before all lead to voltage drop. Not to mention different weather conditions and such, the list goes on.

Again I ment no dissrespect, that you can be assured. For the average novice, until he knows enough to make a educational decision he should leave the LVCO (low voltage cut off) off or at it's lowest voltage so that is one less thing he has to repair his heli for.

Enjoy the toys!

Tom

I'm married so you know I am no stranger to pain!
05-19-2008 05:35 AM
 
 
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Gohbee Aviation Stinger 30-90 > My Phazor 600 build progress
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