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HeliProz . ZoomsHobbies . HeliHobby

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e-Align T-REX 450-500-600 > Chili pepper 3600 / 1500 Kokam setup seems gutless :(
 
 
trexmike
Senior Heliman
Location: uk

Well I finally got to the field today and tried out my new T-Rex. The chili pepper 3600 motor is gutless to say the least on a 9 tooth pinion. I could only just about fly circuits because the motor was bogging so much.The governor was wide open, I tried to reduce the pitch right back but it still bogged. I think its either the lipo 1500 Kokam pack cannot supply enough juice or the motor is not up to the task with only an 9 tooth pinion.

Anyone else using this combo with any success???

12-27-2004 Over year old.
 
 
hpilotrc
Veteran
Location: NY--->>Mooresville, NC USA 8/2005

Gutless Chili Pepper 3600

Dynomo,

I am currently building a T-Rex for a friend with a Chili Pepper 3600 in it. That is not good news as he expected the motor to be very strong. We will be using it with a 9 tooth pinion and a TP2100 Gen 2 pack. Hopefully I will test fly it by this time next week.

Are you using a heat sink? Have you tried advancing the timing on the speed control? I am using a Phoenix 25 updated to the latest firmware.

Michael
12-27-2004 Over year old.
HOMEPAGE  
 
 
trexmike
Senior Heliman
Location: uk

Hi Michael

I am using a heatsink on my chili pepper, I found my zoom's SAB carbon blades fly better as they are shorter so less drag I guess. I thought the chili pepper would produce way more power than needed, but to be honest at the moment its not much better than a himax in power rating. I will work on it some more, it could well be the setup needs a bigger lipo like a 2100, but of course the bigger the lipo the more weight so you cant really win. I wish I had got the chili pepper 4200 as this probably would of produced alot more power with the right pinion.

I am using the phoenix 35 with standard timings, it has the latest firmware.
12-27-2004 Over year old.
 
 
dnam
Veteran
Location: Herndon, VA - USA

Dynomo,

The Kokam 1500mAH deffinately can not provide enough amps (will fly the T-rex though). I have some and they are not really good for this heli. Use TP2100mah.

9t pinion gives you too low a headspeed, try a 12t or 13t pinion.
12-27-2004 Over year old.
HOMEPAGE  
 
 
wildstallionuk
Key Veteran
Location: ENGLAND, FOLKESTONE (NR FRANCE), KENT,

I think if your intent on the 3 cell route and a 3600kv motor, half acceptable performance will only be achieved with 1320mah or less. And do everthing possible to keep the weight down.

I personally opted for 4 cell 1050mah and a 3000kv motor, the data looked much better for this combo.

Check out the items I have for sale in the clasifieds including a CSM 420
12-28-2004 Over year old.
 
 
trexmike
Senior Heliman
Location: uk

dnam, I tried the 11 tooth before going to a 9 tooth, head speed was faster but motor struggled like hell and ran red hot.

I think the best idea is to get a different motor with a lower kv and run 4 cell packs like wildstallionuk suggest. Running TP2100 increases the weight considerably.
12-28-2004 Over year old.
 
 
Lowell Foo
Senior Heliman
Location: Vancouver, BC, Canada

My Kokam 1500s make 25% less lift than TP1320s, definitely no good for anything but circuits. (and that's on a Hornet II)
12-28-2004 Over year old.
HOMEPAGE  
 
 
Jafa
Elite Veteran
Location: Sydney, Australia

Dynomo - I agree with dnam, the Kokam 1500 is not up to it.

I had a Zoom,
used a Hacker B20-15L (similar KV to your motor)
and Kokam 1500 LiPoly,
flew great

Put the same package into the TREX on a 11T pinion
and she was an absolute dog,
dropped to 10T, improvement but not viable.
Switched to LiIon 1900 pack, that sucked too,
that pack will deliver 13 amps but it gets real hot over 10amps.
Switched to TP2100 - hey presto, she had fire in her belly.
Still think I need to drop down to a 9T and it will really come to life.

The TREX needs substantial current due to it's weight and available lift.


Lepton | TRex600Nitro | Sceadu | Freya | Avant | Predator Carbon Max
12-28-2004 Over year old.
 
 
trexmike
Senior Heliman
Location: uk

great thanks for that, I will get a tp 2100 and see what happens from there, thanks for all the input guys.

I found this one in the Uk is this the right pack ?

TP2100-3S 2100 mAh, 3 cells (11.1V)

Thunder Power "Dynamic Power" LiPo Electric Flight Pack
2100 mAh, 3 cell (11.1V), 16 gauge wires
Rating: 10/12C Continuous Discharge
Output: 11.1V Nominal, 2100mAh
Applications: Speed 400, Brushless; 2/3A Sanyo, Kan
Dimensions (wt): 34mm x 98mm x 19mm (145gm
12-28-2004 Over year old.
 
 
dnam
Veteran
Location: Herndon, VA - USA

Yes, that's it. It will fit your T-rex perfectly. It fits snugly in between the two side frames. I am 100% sure you will get good results with this battery. (Kokam 1500mah are only rated for 8C).
12-28-2004 Over year old.
HOMEPAGE  
 
 
trexmike
Senior Heliman
Location: uk

Great thanks for that, I will order one up now.
12-28-2004 Over year old.
 
 
dnam
Veteran
Location: Herndon, VA - USA

While you are at it might as well order a heatsink for your motor too.

Someone just posted this in another thread. It is a great pinion/headspeed calculator:
http://dev.asdf.co.nz/RPM/

(T-rex main gear has 150 teeth, 3.7V-s per cell with LiPo)
12-28-2004 Over year old.
HOMEPAGE  
 
 
trexmike
Senior Heliman
Location: uk

I am using one already
12-28-2004 Over year old.
 
 
3 Mistakes High
Heliman
Location: Wilsonville, Oregon

CP20-4200

CP20 4200 with a 8 tooth pinion on kokam's 1500 was a total dog. Switched to a TP 2100 pack and we have a instant rocket ship. Temp on pack about 110 and the motor about 150 with heatsink. Feels like a hot 30 size bird. the extra mass of the Trex feels nice for smooth patterns and basic rolls and loops. Flight time is around 11min's with some reserve. Any other CP20-4200's out there?
12-29-2004 Over year old.
 
 
Modefo's Heli's
Senior Heliman
Location: Littlerock CA

I would say its the kokams and not get down on the chili Pepper

I have found the chili Pepper to have great feedback
12-29-2004 Over year old.
 
 
trexmike
Senior Heliman
Location: uk

I have just ordered a tp 2100 so we will see what happens.
12-29-2004 Over year old.
 
 
trexmike
Senior Heliman
Location: uk

Battery came in the post today, will try it out a little later today.
12-30-2004 Over year old.
 
 
trexmike
Senior Heliman
Location: uk

flight report on TP2100

Ok, I just flew the heli around the back yard on a test flight, did alot of climb outs ect, space is limiting to what I can do until I get to the field. The climbs outs are much more powerful, tail is holding great and gyro gain on the gy401 is at 70% and not a hint of a wag. The headspeed is much more constant, the Kokam 1500 could not hold the headspeed during a climb out or forward flight where as the tp2100 the T-Rex goes up like a rocket and I have put alot more pitch on as well. The battery temp is luke warm so thats better and the motor is still very hot but I guess it was doing alot of climb outs and no forwards flight. The 9 tooth pinion seems about right for this setup, plenty of headspeed and power from the chili pepper 3600. I seem to get around 12 minutes of flight, but will have to confirm that on the next run.

Overall I would say with the tp2100 lipo, the heli is 100% better and this is the way to go. Now if I could lighten this flying pig and get rid of the slop in the head, I am sure the T Rex would be better still.

Thanks for your help guys. Much appreciated
12-30-2004 Over year old.
 
 
rerazor
Elite Veteran
Location: Mich.

Do you have a heatsink on the CP motor?

I have a CP 3600 that I plan to use in the T-rex with a TP 3s 2100. I think I'm going to wait until Hubdave (heliworkz.com) releases his CF CCPM Frame. He thinks he should be able to save almost 100g with some help from Ti shafts.
12-30-2004 Over year old.
 
 
trexmike
Senior Heliman
Location: uk

Yep you 100% need to use a heatsink on the chili pepper 3600 in a
T-rex. If you do loose around 100g with a carbon frame, it will go like stink.
12-30-2004 Over year old.
 
 
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e-Align T-REX 450-500-600 > Chili pepper 3600 / 1500 Kokam setup seems gutless :(
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