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Home✈️Aircraft🚁Helicoptere-AlignOther › Trex or MX400
01-16-2006 01:19 AM  13 years ago
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Anderman

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Thornton, CO

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Trex or MX400
I was wanting to get one of these electric helis I have a raptor 60 now but I am getting burnt out of traveling to the flying fields I thought if got one of these the park could become my new field. Any thoughts or suggestions on what to buy? I would like to keep the price around $400 but I want qaulity. I was looking at the blade but that looks pretty cheap and not real fun to fly. Thanks for the feedback. Also is it necassary to use the 401 gyro or will any HH gyro work?
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01-16-2006 01:36 AM  13 years ago
The_Widowmaker

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Bear Valley Springs, CA

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I can't speak from ownership experience but just from looking at the Blades built and setting out for display, and ones brought into the stores while I was there, I do not see quality. The MX400 or the Trex XL would be good choices but how close to you keep it to $400 is going to depend on what stuff you already have."I'm a Virgin.. I'm just not very good at it. "
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01-16-2006 02:12 AM  13 years ago
magicmalik

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Bayonne, NJ

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i would go with a trex 450xl. You would need all the electronics (motor and esc you can get with the kit), 4 mini servos, gyro, lipo and charger. You dont need a 401, any gyro will work as long as its small but the 401 is what most run because it works very well. The 401 with the 9650 is the best set up for tail i think. Its gonna come out to cost more then 400 tho, 4 good servos (hs56) are gonna cost about 100 alone. Then the gyro depending on which one u get will run anywhere from 75-140. Plus lipo and charger.. the initial investment will be over 400. I would stick with the trex tho, the mx400 is decent but i dont think it is as good as the trex in my opinion. It has a shorter boom so the tail prob wont feel right. Forget the blades. The blade cp and the trex are completely different machines. The blade can not handle wind and although it can be fun to fly, it feels more like a toy i think than an actual heli. The blade can be cool if you have a big indoor place to fly, but if ur gonna go to a park to fly around and do some 3d then your better with the trex.
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01-16-2006 02:31 AM  13 years ago
Anderman

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Thornton, CO

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From I what I have been reading they (TREX and MX400) both seem like ok helis. I was going to try and piece some stuff together and try and get deals. The Trex is about 70 more dollars for the kit. Are the ESC and Motors that come in the combos good or they a waste of time. I have the super brain charger already and I think it con charge the lithium batteries.
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01-16-2006 02:36 AM  13 years ago
TMoore

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Cookeville, TN

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Buy the Rex. It may be more money on the front end but you'll reap the benefits on the back end by having access to more upgrade parts, more parts in general and a better kit right out of the box, IMHO. Depending on the Combo it may be a good deal or it may not. It depends on what you get.

TM
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01-16-2006 02:42 AM  13 years ago
The_Widowmaker

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Bear Valley Springs, CA

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Not sure about the xl ESC and Motor but the SE ESC and Motor need a little attention before using. The heatsink is stuck on the outside of the heatshrink and there are reports of it falling off. finless has posted instructions on how to fix that and make the heatsink actually useful. The motor on the SE 430L is great but there are reports of it coming apart during flight. finless also has instructions on how to fix this.

In addition to these issues it is also my understanding that all trex swashplates have reputation of seperation during flight but again the fix is easy and worth the time.

Read the threads concering the swashplate, tail rotor, motor and esc and unless told othewise I would apply these to the XL as well.

Don't let these comments sway your from the Trex. Once these are fixed I think its a top notch heli and there are some that will say they have done nothing to theres in regards to the fixes and they are still flying. I would just rather take the extra step to be sure.
"I'm a Virgin.. I'm just not very good at it. "
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01-16-2006 02:50 AM  13 years ago
polyhedron

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Amite, Louisiana, USA

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I guess it boils down to you get what you pay for.

Stock, the MX is cheaper, the T-Rex is better. So if budget is a real issue ...

--Matt
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01-16-2006 03:19 AM  13 years ago
leejax01

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Jax. Fl.

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Had Both
I had both helis and I highly recommend the T-rex over the Mx400. You will be frustrated in the aluminum frame, short boom,head design and overall stability. The links are weak and bend easily...not to mention the slop from Z bends. The tail grips have molded ball pivots that is a source of binding, not to mention being weak. The skids are weak as the front has a large notch missing where the frame sits lower...might be the back but you get the picture. Basically, the overall performance is below par when compared to a T-rex.

The T-rex has a better head, larger blades and longer boom equals more stability. Stronger parts and ball pivots in most major points, just add one at the tail horn. I too had a Raptor 60 and the T-rex flies as good as that does. I was tired of all the support equipment and 30 minute drive just to fly. Got a T-rex and 5 T-rex's later I am glad I did it. For 400, you can get a descent Xl(I recommend the CDE, but that is my preference). Seen them with motor/esc for about 200 and you get the servos/gyro/receiver for the remaining 200...well a little bit over 200

I would highly recommend the Gy401 or be sorry that you will be buying one later. Others work, but the Gy401 works the best. The T-rex has tons of online parts with easy availability, while the MX400 seems to get the backing of more hobby stores because of their distributors. Get the T-rex, because most Mx400's I see that are modded, have T-rex parts anyways.
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01-16-2006 03:35 AM  13 years ago
mountaindr3wz

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chula vista califorina

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trex all the way. have you seen the mx400 they tried to beat the trex heck no trex wins! go with the rex im telling you. you will have lots of help if you need it from fellow runryder members
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01-16-2006 03:49 AM  13 years ago
Anderman

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Thornton, CO

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It sounds like the TREX is the way to go. I have a R700 rx in an airplane I can use will that fit?. I am concerned about my superbrain 969 it says it will charge Li. I think that is Lithium Polymer is that correct? Also what kind of servos and what is the difference between the hde and cde XL's. What is the best choice for the motors and how do you shop for them? The higher the number the more power it has? How much are replacement blades and can you get carbon blades? Thanks for the advice guys my wife has given me the go ahead to buy so I want to make sure I get the right stuff. How much dialing in is needed on curves and heli setup? Is it like the nitro helis?
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01-16-2006 04:35 AM  13 years ago
dkshema

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Cedar Rapids, IA

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The T-Rex. Definitely. The MX is a bit less heli than the T-Rex at the moment performance-wise. The MX is playing catch-up to the current leader, the T-Rex.

A T-Rex XL is pretty darn good out of the box. HDE is standard one-servo per axis swashplate control, CDE is three servo, 120 degree CCPM swashplate control. Either will fly exceptionally well, you most likely wouldn't be able to tell the difference between the two in the air.

ALL T-Rexes suffer from poorly assembled swashplates -- look at the sticky note at the top of this forum for a quick and useful "how to", to fix the swashplate so it doesn't come apart in the air.

The R700 will work great. No problems.

For servos, most people choose either the Hitec HS 55 for the swash control, consider the Hitec HS 56 as the upgrade. There are all sorts of choices for the TR servo -- again a popular choice is the Hitec HS 50, some are now putting small Airtronics (94091) or Futaba (9650) digital servos on the tail and teaming them up with the GY401 gyro.

The GY240 works well as a gyro, but doesn't have the features of the 401.

For motors, there are a ton. Some of the most popular are the Align 430L/3550 KV motor (though there have been reports of the end-bells separating, and of smoking the guts), the Just Go Fly 400DH or 450TH, and the Mega 16/15/3.

The size of the pinion gear that you choose will depend upon the motor, though the 430L is happy with a 13-tooth, the 400DH with either an 8- or 9- tooth pinion, the 450TH with a 13 tooth. I don't recall what people are using for the Mega 16/15/3. The actual pinion chosen is a compromise between Head RPM, motor efficiency, the ESC you're using, and the battery's ability to supply the current needed to run the motor. You can read through previous posts on this forum to find what most people seem to have gravitated to with regard to motors, pinions, batteries, ESCs.

The generally accepted number for comparing motors is the KV rating -- thousands of RPMs/volt. A 3000KV motor will turn 30,000 RPM with 10 volts, a 3550 KV motor will turn 35,500 with 10 volts applied. These are assuming no losses, so figure about 85% efficiency to get a good ball park number.

The KV number doesn't necessarily have anything to do with the power the motor can deliver.

Carbon Fiber blades are available from all over, including Align, the T-Rex manufacturer. You can find replacement parts cost by visiting some of the advertisers here on RR -- Modefo's Heli, HeliProz, FX Aeromodels, or you can go to the Align RC website and see what parts go for. Prices are no secret when it comes to the T-Rex.

You're going to want a 3S LiPo pack, at least 2000 mah capacity, and at least rated for 15C continuous discharge (30 amps) or greater.

The ESC should be rated for at least 35 amps, and have a battery eliminator circuit (BEC) that will power four servos, the RX, and the gyro without shutting down or going up in smoke. The more popular ESCs are the Castle Creations Phoenix 35, the Align 35A ESCs, and the Kontronik Jazz. If you get the Phoenix 35, buy the Phoenix Link cable so you can program the features easily, as well as upload new ESC software from time to time.

Pitch and throttle curves are easily set up using standard tools such as pitch gauges (but you'll need one that works on these small helis). The stock ones used on the larger nitro birds are just too big and bulky.

If you get an ESC with a decent governor mode, throttle curves are dirt simple -- you just set a flat curve to give you the head speed you're looking for. Set the pitch curves as you would any helicopter.

I don't know about your Superbrain 969..maybe others can help here.

Dave
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01-16-2006 05:20 AM  13 years ago
magicmalik

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Bayonne, NJ

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when did you buy ur superbrain 969? I have both a superbrain and a triton. The earlier 969 models can charge lipo batteries but after a few months MRC realized there was a problem with the programing in the charger that made the 969 discharge lipo's too much ( i think this was the issue). The newer models have this problem corrected. I still use my older 969 to charge lipo's from time to time, i just have to manually keep an eye on the voltage when im discharging and charging my lipos. If you bought your 969 last summer, chances are you have an older model but contact MRC and they can tell you and if you have the older model charger, you can send it to them and they will update it for you for free. I didnt bother with that however because I dont really use the 969 anymore as I have my triton.. i just use the DC power supply the 969 came with to hook up my triton to a wall outlet at home.
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01-16-2006 04:37 PM  13 years ago
mountaindr3wz

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chula vista califorina

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the r700 is a great reciver i have its great! i also use it in my foamy.
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01-18-2006 03:54 PM  13 years ago
Anderman

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Thornton, CO

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Thanks for the help guys I Bought the cde version will ask more questions on radio setup later. Thanks.
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01-18-2006 04:08 PM  13 years ago
cosh

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Leeds

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I have CDE and verry happy with it

this link should help a lot http://www.runryder.com/t226567p1/

and perhaps http://www.runryder.com/t227150p1/

Laterz
-matt
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01-18-2006 05:08 PM  13 years ago
blueline

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Eastern NC

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Wow, dkshema...that was a nice post...you said in relatively few words what it took me days to find on here by reading old posts. That was a very informative post that I feel anyone new or considering a T-Rex should read. Thank You.
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