Power systems discussion

[mk1spitfire]

My T Rex 500 barely goes off ground with 11.1V 2200 18 C what's my problem

try 22v

[mx400]

He said batteries in his first post so I assumed he was using 2x11.1v

[silverado777]

Hi, just got myself a T Rex 500 but can't get it to lift more than a foot?? Is it a setting issue or batteries, it came with C18 2200 batteries, I read a lot on the Evolite 2500 6s, I'm new at this stuff can you help me get this thing to go?

[Burg]

Hey brother, get yourself someone to help you out. It sounds like you may be new to this hobby (just speculating b/c of your join date and the nature of your question).
It's a great hobby but these machines are not toys. You could seriously hurt yourself.

To your flying problem, even with a bad set of lipos the 500 should lift off. Check your radio settings and your pitch.
Can you elaborate a bit more on the symptoms? How fast are your blades spinning? What pinion are you using and what is your throttle curve?

Good luck!

[Burg]

Hi,

With 11.1V you're only flying with 3 cells. The 500 is geared for at least a 4 cell lipo.
Most fly the 500 with 6S.

[EKIM]

my setup:
8s 2500 evolites
jazz 55 @ 75% gov mode
hacker A40 10L with a 15tooth pinion
medusa 6v bec pushing 9257s all around

I was able to get 4 minutes of 3D
the power absolutely blows away the 5s and 6s setups I tried. I couldn't get it to bog running 14* of pitch and 11* of cyclic. A smaller pinion may give me a bit more time tho.

[BobOD]

Does that motor feel heavy? 350 grams is pretty big!

[EKIM]

Here is the motor I'm using : http://www.espritmodel.com/index.asp?PageAction=VIEWPROD&ProdID=6470
Its 265 grams and the power makes up for the weight and then some. I just wish I could get more time out of it. I don't know what my head speed is but it is screaming and I had to lower the gyro gain from my 5s and 6s tests. a smaller pinion might help me but I'm really liking how quick it is with the high head speed.

[BobOD]

OOPS, I had looked up the A40 10L plank version.

[EKIM]

I flew the hacker some more with a 14 tooth pinion and it looks like I'm getting 4:15-4:30 of 3D. But my paks are getting too hot @ 130*F with a 40* ambient temp. The motor and esc are both around 75*F

[dieselracer]

I just got home from my Medusa maiden flight. I got the 36-050-16002v-5 with a CC80 and a 13t. It tached at 2850 with a 100% flat throttle curve. This heli had lots of power. This motor is unbogable. I was doing full collective -14/+14 tic tocs to see if i could bog it. And i couldnt. This Motor really woke up the 500. Motor temps with no head sink are the same as the 500L, in my case 125-135Fof hard 3D. And only 110F of easy smooth 3D with FF. Lipo temps were the same as the 500L at 125F. Flight times were also the same as the 500L, IN my case it was 4 minutes of smooth 3D or 3:30 of hard 3D with 2-2200 kongs. This motor is more effient and flys stronger then my friends Scorpion 1400KV. But as we all know its about set up too.

[DrDeath]

I really like the idea of using two 2100 3S in series, but I haven’t really read any specific pros or cons about the usage. I have a two planks and a 450 that use that size battery. My thought would be to just buy more and put them together so I can interchange them as needed. But, I really haven’t read anyone trying this. Any thoughts Finnless?

[michael503]

the packs need to be matched or you'll smoke the weaker one.
Useing a new pack and an identical one with say 100 flights on it is going to toast the older one it your not careful.
2 new ones should be NP.

[LoveMyTrex]

I dono why you guys would want to do 8s setups or scorpion motors. the stock setup on a single 6s 2500 is amazing, tons of power and headspeed, ticktocks soo easy. the align 6s 2500s with the stock motor and esc are sweet, and the batteries have an awesome price.

[DrDeath]

Thanks Michael. I have 3 older ones and just bought a new one about 3 weeks ago. I would probaly buy a few more new ones to keep in mind what you said. Only pair the older ones together and keep the newer ones together.

Thanks again.

[r40734]

I've read through this, and maybe I missed it somewhere, but has anybody tried the Thunder Power eXtreme V2 22OO 6S1P 25C setup on the stock motor?

[BobOD]

I dono why you guys would want to do 8s setups or scorpion motors. the stock setup on a single 6s 2500 is amazing, tons of power and headspeed, ticktocks soo easy. the align 6s 2500s with the stock motor and esc are sweet, and the batteries have an awesome price.

UM....ER...HMMM
Because we'd get bored. :D

[dieselracer]

I've read through this, and maybe I missed it somewhere, but has anybody tried the Thunder Power eXtreme V2 22OO 6S1P 25C setup on the stock motor?

I flew them. They felt the same as my two 2200 Kongs. The 6s 2200 TP V2 was very small and light compared to the 2 kongs. But they flew the same.

[chuckk]

i finally got around to tach'ing the headspeed on my 500 with the medusa 1600v2. stock 500l governed at 87% tach'ed at 2730 with a fresh pack. medusa 1600 v2 governed at 87% tach'ed at 2850 with a fresh pack. seems the 500l doesn't play well with a jazz esc. more power for me! Both were with a 13t pinion.

[Filby]

Is anyone using 4s setup? Im think 4s1800 packs in paraelle on a 17t pinion. Comments?

[dieselracer]

Hey the 600XL has TONS OF POWER!. Its a little hard on the pack. But its STRONG!. I just Put a Scorpion 1400 with a 15T at 100%. And its pretty weak IMHO, when Compared to the Medusa (36-50-1600) and the 600XL.......hmmmmm..... how about the 36-60-1600.. its designed for the 600.. but hey i did put a 600Xl in mine.. I may try it. :YeaBaby:

[LoveMyTrex]

man your crazy, I am loving the power of the stock 500L with 4:30 flight times, what are you getting with the 600l.

[dieselracer]

man your crazy, I am loving the power of the stock 500L with 4:30 flight times, what are you getting with the 600l.

I get 3:20 of hard flight out of the Stock L, the Medusa 50-1600, the 600L, and the Scorpion 1400kv. I Would get 3 minutes of hard flight out of the 600XL.

[Filby]

I tried out my 4s3600FP's today and theres just not enough power on 17t pinion. I cant seem to get any larger pinions in Australia either.

[lakespinner2]

Here's another data point for the 8s scorpion 1210 kv motor, 14T, two 4S 2100 FlightPower Evo Lite 20C packs, Jazz 55 in governor mode with a 74% flat throttle curve in IU2. Flight time seems to be around 3 and a half minutes, I might add 10 or 15 seconds if it's not being flown really hard.

This was a test flight in Huntsville this weekend (hence the landings and the gaps in the graph). We kept tweaking things and going up again; nearly flew too long, but the batteries are fine; I flew them again today. I only have about a dozen flights on the new 500 but I already like it. A lot ! :P Props to SmokenJoe50 for the 8s inspiration. Thanks to the Align pilot for flying it and doing the tweaking. :noteworthy

In other tests when playing with the throttle curves, the motor easily spun the blades above 3000 rpm; however, it just sounded too vicious for my taste. I can't wait to get some more flights on it. :thumbup: