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T-REX 250 › Buying a Trex 250
03-19-2009 01:37 AM  8 years agoPost 1
contest10

rrApprentice

England

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Hi, I currently fly a 90 Helicopter and I'm thinking of buying a Trex 250 (possibly the 450, but unlikely).

I want something I can really throw around, learn fast on but not be afraid to smash up.

So far from what I've read (and I have checked every thread I could but my brain is kind of overloaded with information at the moment) I will need to/might benefit from:

Changing the rotor blades at some point for performance (this isn't top priority).

Change from 15T to 16T pinion (preferably when building. I can probably get away with just thread locking this and may not have to drill and pin it. This seems essential.

Change the skids, or add more skids (looking rather like a caterpillar).

I've also read about an upgraded tail design, I live in England and I've looked around but I can't seem to find such a thing.

Now I'm considering the 450 but its parts are twice the price (for the most common parts that get broken when crashing).

I didn't want to spend loads on this machine at first, but now I'm thinking of it more like a project, so I might go with an expensive Gyro (I'm looking at the Spartan). I quite like the logictech gyros, I use the bigger one, I'm considering one of them too.

I haven't found the specs of the align servos that it comes with, I rather think they are quite good but it would be nice to know if there's another viable option. At the moment I'm thinking of just buying the 'combo kit' and then adding to that. Some people have stated they use bigger tail servos than others, do you need to mod the mount for it to fit in or?

I'm also a believer that you make part A strong and part B get's hit instead. So I will be thinking hard about what parts I do upgrade. For the parts I have mentioned do you know of a website that will sell these?

Regarding batteries... I have an Align Charger so I'll be buying some reasonable batteries but I'm honestly not too fussed. I won't buy the best/most expensive nor the heaviest and cheapest.

I'd like to upgrade the motor (I know it flies well but I want it faster, I might be able to cut a deal with a shop that they keep the original and I buy a better one). Again, the motor isn't of super high priority but would you be able to recommend one that is available in English shops? A lot of the things I notice that are easily available in America are harder to find here. I looked up some 'TonicX' motor, I couldn't find it. Then I read scorpion aren't that good compared to the stock motor...

I'm using a spektrum dx7, I'm thinking of just buying a 6 channel receiver. I don't want to spend more than I have to.

I understand you've probably seen a lot of topics like this, my apologies.

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03-19-2009 02:28 AM  8 years agoPost 2
caseyjholmes

rrElite Veteran

Portland, Oregon

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Hi, I currently fly a 90 Helicopter and I'm thinking of buying a Trex 250 (possibly the 450, but unlikely).

I want something I can really throw around, learn fast on but not be afraid to smash up.
This heli will teach you quick, and in a small area. But be patient, it can be frustrating to set up, even for the experienced. It's much smaller than your 90 and you can break stuff just by looking at it wrong. Take your time, and realize this will require lots of patience.
So far from what I've read (and I have checked every thread I could but my brain is kind of overloaded with information at the moment) I will need to/might benefit from:

Changing the rotor blades at some point for performance (this isn't top priority).

Change from 15T to 16T pinion (preferably when building. I can probably get away with just thread locking this and may not have to drill and pin it. This seems essential.

Change the skids, or add more skids (looking rather like a caterpillar).
I would recommend 2.5mm 16T set screw pinion first thing. Then the 205D carbons. I have never broken my landing gear yet after two crashes and a few rough landings. I do not see this as an essential upgrade like the pinion or carbon mains.
I've also read about an upgraded tail design, I live in England and I've looked around but I can't seem to find such a thing.

Now I'm considering the 450 but its parts are twice the price (for the most common parts that get broken when crashing).
The new kits come with the new bearings in the tail.
There are several tail upgrades on their way out now to increase tail performance as well.
I didn't want to spend loads on this machine at first, but now I'm thinking of it more like a project, so I might go with an expensive Gyro (I'm looking at the Spartan). I quite like the logictech gyros, I use the bigger one, I'm considering one of them too.
I hear nothing but good things about Spartan but have not tried them yet myself.
I haven't found the specs of the align servos that it comes with, I rather think they are quite good but it would be nice to know if there's another viable option. At the moment I'm thinking of just buying the 'combo kit' and then adding to that. Some people have stated they use bigger tail servos than others, do you need to mod the mount for it to fit in or?
Buy the basic kit (includes cyclic servos, motor and ESC) and add a spartan and a JRDS290G tail servo. Stock cyclic servos are fine but pass on stock tail servo (420?)
I'm also a believer that you make part A strong and part B get's hit instead. So I will be thinking hard about what parts I do upgrade. For the parts I have mentioned do you know of a website that will sell these?

Regarding batteries... I have an Align Charger so I'll be buying some reasonable batteries but I'm honestly not too fussed. I won't buy the best/most expensive nor the heaviest and cheapest.
Buy the align packs then. $25 bucks and average bang for your buck.
I'd like to upgrade the motor (I know it flies well but I want it faster, I might be able to cut a deal with a shop that they keep the original and I buy a better one). Again, the motor isn't of super high priority but would you be able to recommend one that is available in English shops? A lot of the things I notice that are easily available in America are harder to find here. I looked up some 'TonicX' motor, I couldn't find it. Then I read scorpion aren't that good compared to the stock motor...
The stock motor is excellent IMO. Upgrade motors are experimental at this point in time. Shortly, we will see more upgrade motors for drop in replacement.
I'm using a spektrum dx7, I'm thinking of just buying a 6 channel receiver. I don't want to spend more than I have to.
Should be good to go!
I understand you've probably seen a lot of topics like this, my apologies.
No worries. Enjoy your new purchase.
I love my Trex 250 and am glad to help out anyone who is interested in one. This is a great heli if you can handle it's setup.

P.S..
Don't forget an MIP/Thorpe .9mm hex driver. It will save you from pulling your hair out for sure.

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03-19-2009 04:15 AM  8 years agoPost 3
Drew7601

rrApprentice

N.M.

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yup this little heli is a blast to fly!! great heli

Loving life! Flying helis.

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03-19-2009 12:36 PM  8 years agoPost 4
gmcullan

rrKey Veteran

Southbridge, MA

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I have two of them, one over a hundred flights and the other nearing that count. My only issue to date is that I broke one landing skid leg. I always switch back to Idle "0" prior to landing and for some reason, one time, I left the heli in Idle "1". I definitely plunked the heli down much firmer than I intended.

While these are the smallest helis in my fleet, they are becoming the most flown. There is severe "fun-factor" in these little machines.

Gerry Cullan,
Gaui 200, 255; T-Rex 250, 450 SE & SA, Mini-Titan, Blade 450

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03-19-2009 12:50 PM  8 years agoPost 5
contest10

rrApprentice

England

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Thanks for all the replies, I am going to go the Spartan/JR route me thinks. I'll leave the main blades for now, they are considerably more expensive and I'll probably dent it a bit when I'm first setting it up.

The tail has been changed in newer models as I am lead to understand which is great. I will keep most things stock then for now.

I noticed some people mentioned the ball links not being great or something. Do I just have to make them a bit bigger? Do they fit too tight or?

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03-19-2009 06:38 PM  8 years agoPost 6
gmcullan

rrKey Veteran

Southbridge, MA

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The ball links tend to be very tight. I bought a re-sizing tool from a RR advertiser and it has worked very well. Having built two of the 'Rex 250's, I'd say this tool is a must-have. The links on my two helis are smooth and slop-free. I would even think of trying to fly this heli with the stock, tight links.

Gerry Cullan,
Gaui 200, 255; T-Rex 250, 450 SE & SA, Mini-Titan, Blade 450

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03-19-2009 06:55 PM  8 years agoPost 7
inkspot1967

rrProfessor

Cranston Ri

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you have to size them but dont bother buying a sizer you can make one with the extra parts included. just take the extra ball and aluminium post put them together then dremel 2 slots in the ball and done.

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03-19-2009 07:50 PM  8 years agoPost 8
contest10

rrApprentice

England

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Yeah I've just cut the ball a bit with a knife and stuck in a drill . I should really buy a screwdriver with a torque gauge on at some point. I'm surprised at how well things are machined, I had heard some bad things about Align before.

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03-20-2009 12:23 AM  8 years agoPost 9
flyboy907

rrVeteran

woodstock, ga

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just a quick chime in , carbon blades in my opinion are a must, the plastic ones are really crappy to do any 3d at all, the carbons make flying it easier in my opinion, only 20

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03-20-2009 02:15 AM  8 years agoPost 10
lugnutz

rrApprentice

trenton,nj

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i agree with casey on everything,but i do have the spertan gyro on mine and love it so have fun and get one

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03-20-2009 02:19 AM  8 years agoPost 11
FS+

rrApprentice

BKK

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carbon blade first

just a quick chime in , carbon blades in my opinion are a must, the plastic ones are really crappy to do any 3d at all, the carbons make flying it easier in my opinion, only 20
+1 yes yes

Happy helicopter

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03-20-2009 02:59 PM  8 years agoPost 12
contest10

rrApprentice

England

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I can not find the JR servo in English websites, do you know if the logictech servo will work just as good?

http://www.fast-lad.co.uk/store/log...rvo-p-3765.html

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03-24-2009 08:42 PM  8 years agoPost 13
contest10

rrApprentice

England

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I'm ready to buy the gyro and servo very shortly, one thing I am a bit confused on, will I be able to set the Gyro up for the logictech servo without buying a lead to connect to a computer/laptop etc?

You have to change the pulse rate or something, can I do that with buttons on the gyro itself?

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03-24-2009 08:47 PM  8 years agoPost 14
Jag72

rrProfessor

South of Boston

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Yes...

You can program the logitech with the sticks...it's fine...

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03-24-2009 08:49 PM  8 years agoPost 15
contest10

rrApprentice

England

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I mean program the spartan gyro for the logictech servo. Not the logictech gyro.

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03-24-2009 08:53 PM  8 years agoPost 16
Jag72

rrProfessor

South of Boston

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Yes....

I just programmed my new Spartan last night...done with sticks only...

The Spartan is VERY simple to set up...

you get 3 choices for servos...for the Spartan...

Funny thing...I happen to have a NIP Spartan on my desk right now...so I opened up the instruction book and snapped a pic for you...here are the servos compatable with the Spartan

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03-24-2009 09:04 PM  8 years agoPost 17
contest10

rrApprentice

England

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Thanks, I understand the servo is compatible but I wasn't sure how I would know what setting I was on without the use of a computer. Does the Gyro have a little screen on it or something?

Also, the ESC runs at 6V by default, the spartan gyro and 3100G Logictech servo and the Align servos should ALL be compatible with that correct (just making doubly sure)?

I've read the thread here : http://www.helifreak.com/showthread.php?t=82587

Angelos states 760uSec/333Hz. Which did you use for your logictech servo?

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03-24-2009 09:28 PM  8 years agoPost 18
Jag72

rrProfessor

South of Boston

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tail drop down reg...

You need to get a 5.1 volt drop down reg to put in line with the servo....

When you get the Spartan it will all make sense...the manual explains it clearly...basically there is a bluel ed that blinks a certain amount of times to show you what servo you have selected..

Here's a couple more pics for you ..


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03-24-2009 09:37 PM  8 years agoPost 19
contest10

rrApprentice

England

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Thanks, I understand now. About the step down. So the align servos work at 6v but the Logictech doesn't? Hmm I thought they would all work at 6v, that's a bit of a shame .

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03-24-2009 09:43 PM  8 years agoPost 20
Jag72

rrProfessor

South of Boston

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6Volts on tail servos

It's not good overall to run the tail servos on 6volts...tends to burn them up faster as most are only rated for 4.8-5.3volts.

Trust me...you're better off just dropping an inline 5.1volt reg on it and you'll be happy...

I do it on all of my machines...

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