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Old Sep 25, 2011, 11:59 PM
Gonna need a bigger plane . .
FlopGun's Avatar
Kitsap County, WA, USA
Joined Jul 2007
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Originally Posted by TyeeFlyer View Post
Let's do it.
RF 5.5 sesh up now, called 'hoerdouvres and cocktails'
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Old Sep 26, 2011, 02:51 AM
Flarpy
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Kitsap County
Joined Nov 2010
763 Posts
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Originally Posted by FlopGun View Post
RF 5.5 sesh up now, called 'hoerdouvres and cocktails'
Wish I had 5.5.....wish I had a working sim. Maybe I should just pull trigger and buy one. Hummmm
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Old Sep 26, 2011, 12:56 PM
Gas Monkey Vic
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Snohomish, WA
Joined Jan 2005
1,515 Posts
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Originally Posted by racerxky View Post
bicyclechris, vitter (and who what the other person there, I'm bad with names!) thanks for the warm welcome at the field. My application will be headed in shortly. You guys are great pilots and have lots of the addict attitude :-)

I gotta get more stuff in flying shape. I need cans for my 100cc and my 50cc needs repairs and an electric conversion. I have foamy gear but no foamy and thats just no good!

vitter that raven has a silly amount of power. I was looking around and you posted that its got the Hacker Q80-8M in it. What esc are you running? How is that power system holding up?
Nice to have met you too and nice flying BTW.

It is the Hacker Q80-8M and MasterSPIN-125-OPTO ESC with a Xoar 24x10E prop. The system seems to be happy. The highest motor temperature on a hot day was 140 and the ESC was ambient temperature. The batteries do get on the warm side if I'm aggressive with the throttle. I have only checked the amps with a clamp on amp meter and with fresh packs slamming full power it peaks at 125 amp then settles down to around 120amps. The JetiBox recorded in flight max amps of 107 and I would guess under load my voltage is around 40 so 40x107= 4280 watts.

I wounder if my Eagle Tree can handle a power system like this? I would love to get some in flight data.

vitter
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Old Sep 26, 2011, 04:19 PM
Watts is where its at!
racerxky's Avatar
United States, WA, Seattle
Joined Oct 2004
1,748 Posts
Quote:
Originally Posted by Vitter View Post
Nice to have met you too and nice flying BTW.

It is the Hacker Q80-8M and MasterSPIN-125-OPTO ESC with a Xoar 24x10E prop. The system seems to be happy. The highest motor temperature on a hot day was 140 and the ESC was ambient temperature. The batteries do get on the warm side if I'm aggressive with the throttle. I have only checked the amps with a clamp on amp meter and with fresh packs slamming full power it peaks at 125 amp then settles down to around 120amps. The JetiBox recorded in flight max amps of 107 and I would guess under load my voltage is around 40 so 40x107= 4280 watts.

I wounder if my Eagle Tree can handle a power system like this? I would love to get some in flight data.

vitter
125A on 12S 5000mah right? So that's 107/5 = 21.4C. I would want to buy 35C packs for that, especially if they are Zippy packs.

My Vyper setup is pulling about 80A/16C which what that motor can handle before it gets too hot. I had more prop on it and the motor hit 180 in Oklahoma with an ambient temp of 100.
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Old Sep 26, 2011, 04:43 PM
Gas Monkey Vic
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Snohomish, WA
Joined Jan 2005
1,515 Posts
Quote:
Originally Posted by racerxky View Post
125A on 12S 5000mah right? So that's 107/5 = 21.4C. I would want to buy 35C packs for that, especially if they are Zippy packs.

My Vyper setup is pulling about 80A/16C which what that motor can handle before it gets too hot. I had more prop on it and the motor hit 180 in Oklahoma with an ambient temp of 100.
Yup, 12S 5000mah 25C packs. Some Zippy, Nano-Tech, & Blue Lipo's. I have a brand new set of four 6S 5000mah 30c Zippy's. I was saving them for the 100cc electric project.

180 yup that might be to much prop lol
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Old Sep 26, 2011, 06:24 PM
Watts is where its at!
racerxky's Avatar
United States, WA, Seattle
Joined Oct 2004
1,748 Posts
These might be the hot ticket:
http://www.hobbyking.com/hobbyking/s...idProduct=9935
6S 5800mah 30C, 838g $66

versus this:
http://www.hobbyking.com/hobbyking/s...dProduct=16794
6S 5000mah 40C, 834g $63

I love that. Basically the same weight and cost so how do you decide?

110A / 5.8 = 18.9C.
19C continuous out of a 30C pack is no problem (63% capacity).

110A / 5 = 22C.
22C out of a 40C pack is also no problem, at just 55% capacity some might say that's overkill.

If the 5000mah packs give you a 6 minute flight that's an extra minute on the 5800. A 7-8 minute 50cc electric? The dream is here!
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Old Sep 26, 2011, 06:32 PM
Gonna need a bigger plane . .
FlopGun's Avatar
Kitsap County, WA, USA
Joined Jul 2007
2,951 Posts
if anyone has a pair of 6S 5000mah 25c .... I'm interested...
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Old Sep 26, 2011, 11:00 PM
aka JetMan Joe
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Joined Feb 2010
2,773 Posts
Quote:
Originally Posted by racerxky View Post
I love that. Basically the same weight and cost so how do you decide?

110A / 5.8 = 18.9C.
19C continuous out of a 30C pack is no problem (63% capacity).

110A / 5 = 22C.
22C out of a 40C pack is also no problem, at just 55% capacity some might say that's overkill.

If the 5000mah packs give you a 6 minute flight that's an extra minute on the 5800. A 7-8 minute 50cc electric? The dream is here!
Hi Racer, looking forward to meeting you.

I've done a bunch of performance testing and I've noticed that when all things are equal (motor, prop, esc, full throttle setting) and the motor is heavily loaded a higher C rated battery will generate a higher amperage reading. You won't see this if the motor is not fully loaded, for example a Hacker A60 spinning a 9x6 prop. But when my hacker A60 6XS V2 is spinning a 22x10 in front of a 5800 Turnigy 25C 6 cell it starts off drawing 109A and settles out at ~96A. When I dropped in a 5000 Nano 45C the amps start at over 118A and settle out around 103A. The battery discharge capacity can act as the current limiter in the system.
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Old Sep 26, 2011, 11:47 PM
Quadrophenia
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Seattle
Joined Mar 2009
915 Posts
^^ That's what I'm talkin' about.
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Old Sep 26, 2011, 11:55 PM
Gas Monkey Vic
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Snohomish, WA
Joined Jan 2005
1,515 Posts
Quote:
Originally Posted by racerxky View Post
These might be the hot ticket:
http://www.hobbyking.com/hobbyking/s...idProduct=9935
6S 5800mah 30C, 838g $66

versus this:
http://www.hobbyking.com/hobbyking/s...dProduct=16794
6S 5000mah 40C, 834g $63

I love that. Basically the same weight and cost so how do you decide?

110A / 5.8 = 18.9C.
19C continuous out of a 30C pack is no problem (63% capacity).

110A / 5 = 22C.
22C out of a 40C pack is also no problem, at just 55% capacity some might say that's overkill.

If the 5000mah packs give you a 6 minute flight that's an extra minute on the 5800. A 7-8 minute 50cc electric? The dream is here!
I like the idea of the Zippy 5800mah 30c packs but I wonder how many more amps I would see with 30c vs 25c?

Quote:
Originally Posted by MCSGUY View Post
Hi Racer, looking forward to meeting you.

I've done a bunch of performance testing and I've noticed that when all things are equal (motor, prop, esc, full throttle setting) and the motor is heavily loaded a higher C rated battery will generate a higher amperage reading. You won't see this if the motor is not fully loaded, for example a Hacker A60 spinning a 9x6 prop. But when my hacker A60 6XS V2 is spinning a 22x10 in front of a 5800 Turnigy 25C 6 cell it starts off drawing 109A and settles out at ~96A. When I dropped in a 5000 Nano 45C the amps start at over 118A and settle out around 103A. The battery discharge capacity can act as the current limiter in the system.
I saw 107 max amps from the ESC with the Jetibox on old 25c Zippy's. How many more amps do you think I might see with new 30c Zippy's? I like the idea of more Mah.....humm. what do you guys think?
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Old Sep 27, 2011, 01:35 AM
Watts is where its at!
racerxky's Avatar
United States, WA, Seattle
Joined Oct 2004
1,748 Posts
Quote:
Originally Posted by MCSGUY View Post
Hi Racer, looking forward to meeting you.

I've done a bunch of performance testing and I've noticed that when all things are equal (motor, prop, esc, full throttle setting) and the motor is heavily loaded a higher C rated battery will generate a higher amperage reading. You won't see this if the motor is not fully loaded, for example a Hacker A60 spinning a 9x6 prop. But when my hacker A60 6XS V2 is spinning a 22x10 in front of a 5800 Turnigy 25C 6 cell it starts off drawing 109A and settles out at ~96A. When I dropped in a 5000 Nano 45C the amps start at over 118A and settle out around 103A. The battery discharge capacity can act as the current limiter in the system.
Your observation is absolutely right. You can check the math: 66% vs 45%. I should start calling that "duty cycle". The lower duty cycle setup is going to give you more absolute performance.

It's all about what you want out of the setup. Was the difference in those two setups really noticeable (7A more)? Was their a weight difference?
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Old Sep 27, 2011, 01:51 AM
I think I forgot how to fly RC
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United States, WA, Woodinville
Joined Mar 2007
8,063 Posts
Quote:
Originally Posted by Vitter View Post
I like the idea of the Zippy 5800mah 30c packs but I wonder how many more amps I would see with 30c vs 25c?



I saw 107 max amps from the ESC with the Jetibox on old 25c Zippy's. How many more amps do you think I might see with new 30c Zippy's? I like the idea of more Mah.....humm. what do you guys think?
I think a gallon of gas has enough stored energy to create alot of mAH's


So if the weather holds and the stars and planets align, I am going to shoot for a Wednesday maiden of the new slick 540 at Mar/c before the sun sets.
Just have to wait for Deanna to get done with her hair appointment and show up at the field.

I'll be bringing my new battery charging station for show and tell. Got it as an anniversary present
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Last edited by cryhavoc38; Sep 27, 2011 at 02:00 AM.
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Old Sep 27, 2011, 03:52 AM
aka JetMan Joe
MCSGUY's Avatar
Joined Feb 2010
2,773 Posts
Quote:
Originally Posted by racerxky View Post
Your observation is absolutely right. You can check the math: 66% vs 45%. I should start calling that "duty cycle". The lower duty cycle setup is going to give you more absolute performance.

It's all about what you want out of the setup. Was the difference in those two setups really noticeable (7A more)? Was their a weight difference?
The thing I noticed immediately with the 45c Nano was the heat of the motor. After ~30 sec WOT I could not touch it and it was obvious I would be smelling it soon if I continued. The 22x10 is the max prop allowed for by the factory but even with 25c it rose to 160F after a 60 sec WOT run. I think a 15c battery might have kept the temp at a reasonable level.

The interesting thing is the additional amps generated by the Nano went straight to heat. The starting thrust was 22.6 lbs which was identical to the 25c battery even though it was pushing ~9A less through the motor. That told me the 22x10 wasn't worth the reduced flight time. I settled on the 21x10 (80A/18.3lbs/6-7 min flight times) which feels performance wise not to be leaving anything on the table
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Last edited by MCSGUY; Sep 27, 2011 at 04:01 AM.
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Old Sep 27, 2011, 04:03 AM
aka JetMan Joe
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Joined Feb 2010
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Quote:
Originally Posted by cryhavoc38 View Post
i think a gallon of gas has enough stored energy to create alot of mah's


i'll be bringing my new battery charging station for show and tell. Got it as an anniversary present
lol!
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Old Sep 27, 2011, 10:01 AM
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Joined Aug 2007
548 Posts
That is an awesome recharger.....airplanes is fully charged in less than a minute....Must be a 1000 C charge rate!!!
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