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T-REX 500 › 8S Mod for Trex 500 with Scorpion 1210kv
06-06-2010 04:02 AM  7 years agoPost 1
NQNA

rrElite Veteran

USA

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What Mah batterys are you all running on your 8S Trex 500's?

I'm planning on running a Scorpion HK-3026-1000KV with a 16t. I want to buy some Turnigy 4S packs to make the 8s setup.

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06-06-2010 03:12 PM  7 years agoPost 2
NQNA

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USA

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No 8S guys out there?

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06-06-2010 03:13 PM  7 years agoPost 3
ttaylor63

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Floresville,Tx

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Most are running between 2650-3300 MAH 6s lipo's. I just ordered 2 2650's 6s 40c turnigy lipo's for my 500.
Guess you could run bigger but the CG will be off some with the additional weight. I'am running the stock motor 500M

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06-06-2010 03:16 PM  7 years agoPost 4
NQNA

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USA

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I have run the Hyperion 6S 2600 Mah with a Scorpion 1600kv and 14T.. but Really think 8S is the way to go.

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06-06-2010 04:39 PM  7 years agoPost 5
michael88997

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Lewisville,Tx

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I have the rhino 2150 30c packs and cg is perfect... There's also turnigy 2200 packs

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06-06-2010 09:20 PM  7 years agoPost 6
NQNA

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USA

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michael8897.. What are your flight times with the 2200's and what type of flying are you doing?

Thanks..

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06-06-2010 09:41 PM  7 years agoPost 7
michael88997

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Lewisville,Tx

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Well I'm still setting it up but 3 min of 100% hovering and some pitch pumping and sport flying used 400 mah in each pack so I'm thinking 5 min of hard hard 3d...

I had a 6s 500 and I would get 3 min and use 80% of a 2500 pack which is how hard I fly

I'm sure the fbl helps some but the scorpion 1000 and 15t has tons of power, doesn't bog, and everything came down 6 degrees above ambient temp

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06-06-2010 09:58 PM  7 years agoPost 8
NQNA

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Thanks for info Michael88997..

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06-06-2010 10:32 PM  7 years agoPost 9
NQNA

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USA

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I'm thinking maybe the Scorpion 1210KV on a 13t pinion or maybe 14t.. Anybody using this combo?

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06-06-2010 10:45 PM  7 years agoPost 10
michael88997

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Lewisville,Tx

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I talked to scorpion when I first build mine and they recommended the 1000 because it was designed for a t500 8s, the 1210 is the older version

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06-07-2010 12:52 AM  7 years agoPost 11
NQNA

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USA

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On the Scorpion site in the HK Series Application guide.. they say this..

"For a Trex 500 running on 8-cell Li-Po power, the HK-3026-1210 is the correct motor, with a 13 tooth pinion gear."

When I run the head speed numbers and when I consider running the Ice 100 in Governor Mode.. The 1210kv looks better to me. I'm thinking a 14t pinion. I'm shooting for 2850 - 2900 rpm.

Here is my planned Ice 100 setup.

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06-07-2010 02:48 AM  7 years agoPost 12
Hen3

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America

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Just converted my T-Rex 500 to 8S FBL.

Still sorting things but current setup is Scorpion 3026-1210, 14T, SetRPM, 2700 HS, Outrunner mode, Normal timing. Batteries are Hyperion G3VX 2200 mAH.

Here is an ICE graph of this combo. 4.5 Minutes of 3D = 1300 mA used. Efficient and ballistic setup - I like

According to my heaspeed calculator, for a target headspeed of around 2900 you'd need a 15T pinion at least.

michael88997,

Those are some really low numbers. Since you are running an ICE ESC, can you log and post a similar graph?

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06-07-2010 02:53 AM  7 years agoPost 13
NQNA

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USA

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Here are my calculations on the 1210kv..

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06-07-2010 03:35 AM  7 years agoPost 14
Hen3

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America

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Here are mine:

This little app has proven to be fairly accurate.

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06-08-2010 07:27 PM  7 years agoPost 15
blackbird

rrVeteran

thessaloniki-Greece

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Hi, i want to ask something about my trex500, i have hyperion 3026-1210, ice cc75 , 2 X 4s 2300mah lipo,i run in 8s and after 5 min of 3d my cells go down to 3.68v and i put back 3956 mah, what timing -pwm -gain etc. do you guys use?

Thank you ,george.

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06-08-2010 07:37 PM  7 years agoPost 16
NQNA

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USA

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I plan on using 1800Mah Turnigy 30C 4S packs x2 .. Timing will be set as "normal" I'm shooting for 2850 RPM on a 14T pinion.

Here is my planned Ice 100 settings.

Blackbird.. what pinion and head speed are you running?

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06-08-2010 07:57 PM  7 years agoPost 17
blackbird

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thessaloniki-Greece

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i have the gain set in 10, do you set yours at 25? I use 15t pinion and 2750 set rpm. i have low timing ,pwm 8khz.

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06-08-2010 08:58 PM  7 years agoPost 18
NQNA

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USA

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The gain sets how aggressive the Governor mode works to maintain the selected rpm.

IMHO your pinion is too large. 15T will give you too much head speed for this helicopter. It will also be very hard on your batteries.

See my calculations below. What do you think?

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06-08-2010 09:09 PM  7 years agoPost 19
blackbird

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thessaloniki-Greece

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I use 15t because i want the gov to have enough room for the 2750rpm that i want. Do you use outrunner mode or something else? Also i see in your graph that you don't use set rpm mode,why?

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06-08-2010 11:46 PM  7 years agoPost 20
NQNA

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USA

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I use 15t because i want the gov to have enough room for the 2750rpm that i want. Do you use outrunner mode or something else? Also i see in your graph that you don't use set rpm mode,why?
It looks to me with a 14t pinion, that even at min voltage of 29.6 the governor can still give a head speed of 2786.

I just prefer the Governor High Mode and the ease of setting a throttle curve based on the rpm/throttle value.

Yes, I run outrunner mode on the outrunner motors.

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T-REX 500 › 8S Mod for Trex 500 with Scorpion 1210kv
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