RE: Upgrade CP or get a T-Rex?  
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All Forums >> RC Helicopters >> Electric RC Helis >> T-Rex heli >> RE: Upgrade CP or get a T-Rex?
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RE: Upgrade CP or get a T-Rex? - 8/31/2007 5:06:04 AM   
KCinNC



Posts: 431
Joined: 8/4/2007
From: LKN, NC, USA
Status: offline 		this single thread answered so many questions....actually feels like a big weight is off my shoulders !!!


is buying one of the combo kits. copter/esc/motor a good deal...or should i go with the seperates ????


< Message edited by KCinNC -- 8/31/2007 5:10:17 AM >

(in reply to heartofmadnes)
       Post #: 26

RE: Upgrade CP or get a T-Rex? - 8/31/2007 3:16:12 PM   
Steve Collins


 

Posts: 2152
Joined: 12/21/2001
From: St.Charles, MO, USA
Status: offline 		Go with the separates. Most of the combos use equipment that isn't really the best for the application.

_____________________________

Steve Collins

(in reply to KCinNC)
       Post #: 27

RE: Upgrade CP or get a T-Rex? - 8/31/2007 4:10:22 PM   
BoysToys



Posts: 554
Joined: 3/17/2006
From: Bakersfield, CA, USA
Status: offline 		I went with the V2 kit. It came with the heli, ESC (BL35X), motor (430XL), and a battery. I don't think that you can get a SE or V2 model without it coming with the ESC and motor. I then purchased the servos (HS-65mgs), gyro(GY401/9650), receiver(AR6100) and transmitter (DX7)seperately. The Align motor works great. The Align ESC worked great until I had a major crash and did not hit the throttle-hold until after I saw smoke coming from it. I am now running a Castle Creations Phoenix 35 and really like how you can program it via a USB cable and your computer.

On a side note, the battery is JUNK. My Align pack puffed after about 10 cycles. I sent it back and got a replacement and sold it unopened on ebay then bought a FlightPower Evo25 pack.


_____________________________

T-Rex 600CF~T-Rex 500CF~T-Rex 450SE V2~3DHS Extra 300 SHP~Extra Stiffy~E-Flite Mini Pulse XT~Parkzone T-28 Tojan

(in reply to Steve Collins)
       Post #: 28

RE: Upgrade CP or get a T-Rex? - 9/1/2007 1:55:20 AM   
Puckhead


 

Posts: 4
Joined: 2/3/2007
From: , CA, USA
Status: offline 		I hear everyone on here saying the same thing. I will add another comment, buy the TREX, I did the blade thing and wish I would have just paid for the REX in the first place. The money sort of creeps up on you as it leaves your wallet in chunks of 20, 30, 40 bucks at a time. It adds up fast, and Blades are VERY fragile. HOWEVER, I know how to fly now and I have never flown a TREX before, but I would think it is much easier. The simulator doesn't hurt either.

(in reply to BoysToys)
       Post #: 29

RE: Upgrade CP or get a T-Rex? - 9/1/2007 1:30:07 PM   
stevennh


 

Posts: 814
Joined: 6/5/2003
From: Portsmouth, NH,
Status: offline 		Get a used T-Rex SA or SE/SE-V2. It's a great way to get started for shorter money than building new. Lots of folks with more money than patience get these setups and give up on them after a few flights (leaving a bargain on eBay!). I picked up a used SA with decent electronics and some SE upgrades on eBay for less than $600.00 used (metal tail). It's flown like a complete dream for over a year now with only crash related repairs. I went from the CP to the Falcon-3d (the Falcon-3d was a big mistake, complete crap after a few months of flights). I learned to fly on the CP and did not invest much in it. It was a good learning investment, but it's too small to fly well outside in significant wind. The T-Rex handles quite a bit of wind very well and is very, very stable. It even carries a small video setup (200mw 2.4Ghz downlink with camera and battery).

Trex 450-SA
Align Gyro, Futaba 3701 on Tail
HS65HB's on cyclic
Align 430L motor, Align 35A ESC
Spectrum DX6, 6000
Thunder Power Extreme 25C 3s Lipo's
Metal Tail (SE)
Home Made LiPo Alarm (audible)

Steve


< Message edited by stevennh -- 9/1/2007 1:32:18 PM >

(in reply to taylorcoleman)
       Post #: 30

RE: Upgrade CP or get a T-Rex? - 9/2/2007 3:08:08 AM   
KCinNC



Posts: 431
Joined: 8/4/2007
From: LKN, NC, USA
Status: offline 		is there a significant advantage of the DX7 vs. the DX6?? i mean would a DX6 be totally capable for the Trex 450

(in reply to stevennh)
       Post #: 31

RE: Upgrade CP or get a T-Rex? - 9/2/2007 4:55:37 AM   
ezveedub



Posts: 428
Joined: 6/8/2007
From: Davie, FL, USA
Status: offline 		I beleive the DX7 is a full range 2.4 Ghz, while the DX6 is park flier range limited. Also the DX7 has the setup screen which makes setting much easier to see and work with. The DX7 has more setting points also. Most usually find someone selling the Tx only with the charger and battery and then get the servos & Rx as needed. I run the AR6100 Rx with mine.


_____________________________

Hornet X-3D, Trex 450SE, Mini-Z
MP777, MBX5R , MBX5T, Inferno & Spada 09, MBX6, MP9

(in reply to KCinNC)
       Post #: 32

RE: Upgrade CP or get a T-Rex? - 9/2/2007 7:13:48 AM   
jh4db536


 

Posts: 530
Joined: 5/22/2005
From: Monterey Park, CA, USA
Status: offline 		DX6 sucks for the trex...the ECCPM 120* swash doesnt mix correctly. It's something you wont notice unless youve flown both or know setup really well. i have attempted to prove this from when it was first released and now people are starting to believe me now that it can be compared with something that works Right like the dx7,

the DX7 doesnt have this problem, but it isnt a perfect either. i think the software/firmware in it has some bugs; however, nothing that will cause you to lose control of the model.
i still recommend the DX7 despite the issues.

im not even going to bother with the range issue. the DX6 has enough range for a trex450...600 is a different story. the DX6 faults in the ECCPM area and that is the fundamental controls of the model therefore i would stay clear of it.

< Message edited by jh4db536 -- 9/2/2007 7:15:59 AM >

(in reply to ezveedub)
       Post #: 33

RE: Upgrade CP or get a T-Rex? - 9/2/2007 12:51:00 PM   
stevennh


 

Posts: 814
Joined: 6/5/2003
From: Portsmouth, NH,
Status: offline 		jh4db536,

I have been really happy with the DX6 on my SA. This is the first I have heard about mixing issues on the cyclic. I went from a Futaba 6EXH to the DX6 and the DX6 seems to control the cyclic the same as far as I can tell. The only thing I don't like on the DX6 is the 3 point throttle/pitch curves, I would rather have the 5 point curves available on the DX7. Oh, and the stock battery on the Tx could last longer. This is the first time I have ever heard anyone say "The DX6 sucks for the T-Rex". The servos that came with the DX6 would not be appropriate for the T-Rex (slow and poor centering), I sold them on eBay with my 6EXH system but that was painless. What is the issue with mixing on the DX6, accuracy, travel...?

Steve

(in reply to jh4db536)
       Post #: 34

RE: Upgrade CP or get a T-Rex? - 9/3/2007 8:13:57 AM   
jh4db536


 

Posts: 530
Joined: 5/22/2005
From: Monterey Park, CA, USA
Status: offline 		INTERACTION

it happens regardless of the servos used and trust me it wasnt my setup because i was able to reproduce it over and over and make the problem go away simply by switching to a different TX (also used different DX6 systems). you can use digital DS285's or HS65mgs and it will do it the same. i believe it is software limitations related to the DX6 that cause the problem. people actually did scientific studies using high tech instruments to prove it. most people shrugged off the results as something an average pilot wouldnt notice in flight, but i can SEE the interaction when im rolling the cyclic and it's Disgusting. Just roll the cyclic around and the washout will be bouncing up and down especially if you are using a lot of throw and collective (the washout should should not move when you are pounding the cyclic at ANY collective range). The effect in flight is everytime you hit the cyclic, the heli will not maintain altitude. (there are other factors that contribute to this such as wind, cyclic friction, and shift in vector causing a loss of lift) this error prevents it from being perfect, but can be Prevented and thus my argument against the Dx6. a well designed mechanical mixed heli will not have this issue. Even the Trex HDE isnt perfect on the elevator at extreme collective (hence they use that compensating arm between the colective lever and the frame)...elevator will pull forward at extreme negative pitch and push backward at extreme positive pitch due to geometry of the linkages and servo positions.

IMO the Futaba 9C has one of the most accurate mixes JR9303 is probably the best overall for features and ease of use.

< Message edited by jh4db536 -- 9/3/2007 8:26:25 AM >

(in reply to stevennh)
       Post #: 35

RE: Upgrade CP or get a T-Rex? - 9/3/2007 12:51:38 PM   
stevennh


 

Posts: 814
Joined: 6/5/2003
From: Portsmouth, NH,
Status: offline 		jh5db536,

That does'nt sound good. I guess I would never see this with my mild flying around (FF, hovering, figure-8's) but will run into it when (if) I start to do 3d. It sounds like an easy enough problem for the Spectrum guys to fix with a firmware update, I wonder if the DX6 radios have updatable firmware? Thanks for the detail...

Steve

(in reply to jh4db536)
       Post #: 36

RE: Upgrade CP or get a T-Rex? - 9/3/2007 8:22:42 PM   
C5m7b4



Posts: 101
Joined: 6/16/2007
From: Nashville, TN, USA
Status: offline 		Trust me, with the T-Rex, it wont take all that long to get to 3D. Especially if you are using a flight sim.

C5

_____________________________

Blade CX2, Blade CP Pro, and a beautiful T-REX 450SA

(in reply to stevennh)
       Post #: 37

RE: Upgrade CP or get a T-Rex? - 9/3/2007 10:44:32 PM   
stevennh


 

Posts: 814
Joined: 6/5/2003
From: Portsmouth, NH,
Status: offline 		It's just a matter of guts for me and 3d. I can flip and roll all day long on the simulator, I just have not yet built up the nerve to flip the real thing.

Steve

(in reply to C5m7b4)
       Post #: 38

RE: Upgrade CP or get a T-Rex? - 9/3/2007 10:52:09 PM   
truraza


 

Posts: 5
Joined: 3/24/2007
From: Los Lunas, NM, USA
Status: offline 		Buy my V2... I have no time to learn to fly it.

(in reply to ezveedub)
       Post #: 39

RE: Upgrade CP or get a T-Rex? - 9/6/2007 1:50:29 AM   
heartofmadnes


 

Posts: 185
Joined: 3/2/2006
From: Camp Hill, PA, USA
Status: offline
quote:

ORIGINAL: jh4db536

INTERACTION

it happens regardless of the servos used and trust me it wasnt my setup because i was able to reproduce it over and over and make the problem go away simply by switching to a different TX (also used different DX6 systems). you can use digital DS285's or HS65mgs and it will do it the same. i believe it is software limitations related to the DX6 that cause the problem. people actually did scientific studies using high tech instruments to prove it. most people shrugged off the results as something an average pilot wouldnt notice in flight, but i can SEE the interaction when im rolling the cyclic and it's Disgusting. Just roll the cyclic around and the washout will be bouncing up and down especially if you are using a lot of throw and collective (the washout should should not move when you are pounding the cyclic at ANY collective range). The effect in flight is everytime you hit the cyclic, the heli will not maintain altitude. (there are other factors that contribute to this such as wind, cyclic friction, and shift in vector causing a loss of lift) this error prevents it from being perfect, but can be Prevented and thus my argument against the Dx6. a well designed mechanical mixed heli will not have this issue. Even the Trex HDE isnt perfect on the elevator at extreme collective (hence they use that compensating arm between the colective lever and the frame)...elevator will pull forward at extreme negative pitch and push backward at extreme positive pitch due to geometry of the linkages and servo positions.

IMO the Futaba 9C has one of the most accurate mixes JR9303 is probably the best overall for features and ease of use.


You stated that it was tested and scientific studies where done? Is it listed on any site you could send a link? I would like to read more on this since I have been doing 3d with my DX6 for sometime and have not noticed any problems. So I would like to see this fact finding information for my own knowledge...

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Y