okay never seen were u glue the pinion to the motor shaft. Does this hold? or does people use something else than the 48 retainer stuff that comes with the kit.

Would red locktite be better? or JB weld?

I use thin ca and it hasnt come loose

Dont use JB weld you will never get it off!
I fly pretty high head speed and knock it around pretty hard I have many flights like this and it has never come loose

okay just never seen this method, I know its small but dang thats a scary method

Green loctite has always worked for me. Just set the pinion height and let the loctite wick in.

I always use blue Loctite to hold my pinion to my motor shaft. It creates a very strong bond, and the only way to release it is to heat it with a heat gun. I clean both the pinion and the shaft with acetone, apply a thin layer of blue Loctite to the motor shaft, and then install the pinion. When it is correctly aligned, I tighten the grub screw (assuming you're using a pinion with a grub screw). Due to the dissimilarity of the two metals, the blue Loctite sets in about 30 seconds.

CA is not easily removable. JB weld is the same way. Green Loctite is harder to remove than the blue, so if you use decide to use green Loctite, don't put too much on. Red Loctite is unnecessary because the blue holds very, very tight. However, if you really want to use red Loctite (which I don't recommend), it can be removed if you heat it very, very hot with a heat gun. This might end up damaging the motor, however.

Avant RC
Scorpion Power Systems
Thunder Power RC
Kontronik Drives

interesting thanks guys good info

does anyone make a screw kit for this little thing?

Pinion with a set screw?

Innov8tive Designs sells a pinion set which is nice and has set screws for each pinion.

If you're talking about a screw kit for the entire heli, I searched everywhere. I finally bought the RCScrewz kit, and I had to send it back to the manufacturer twice. The 3rd RCScrews 250 kit I received in the mail was better, but I could still only use a few of the screws on the heli. It was, for all intensive purposes, a waste of $40. Whether it is the heads shearing off or the threads being the wrong pitch, RCScrews does NOT make a satisfactory screw kit for the Trex 250. (They make a good one for the 450, however).

The best thing you can do for screws is to buy the MIP drivers which fit so tightly into the stock Align screws that they cannot strip out. And of course you want to replace all of the 0.9mm screws (if your kit still has them) with the 1.3mm screws.

Avant RC
Scorpion Power Systems
Thunder Power RC
Kontronik Drives

Personally I never liked the idea of glueing the pinion and never used it. Pinion with set screws:

http://www.innov8tivedesigns.com/pr...products_id=543

& here:

http://www.fast-lad.co.uk/store/adv...d6e27929d709357

Duke

OOOPPS............

If you're talking about a screw kit for the entire heli, I searched everywhere. I finally bought the RCScrewz kit, and I had to send it back to the manufacturer twice. The 3rd RCScrews 250 kit I received in the mail was better, but I could still only use a few of the screws on the heli. It was, for all intensive purposes, a waste of $40. Whether it is the heads shearing off or the threads being the wrong pitch, RCScrews does NOT make a satisfactory screw kit for the Trex 250. (They make a good one for the 450, however).

The best thing you can do for screws is to buy the MIP drivers which fit so tightly into the stock Align screws that they cannot strip out. And of course you want to replace all of the 0.9mm screws (if your kit still has them) with the 1.3mm screws.

OOOO man you hit that on the head
Been saying that for 2 years now same thing with the 500 set
they should call themselves RC SCREWS U's

Hey,

I use the supplied R48 loctite Align give in the kits to secure my pinion to the motor shaft and it's not given me any trouble.

Only thing I would suggest is to lightly rough up the motor shaft with some fine wet and dry emery paper, this will remove the smooth surface of the shaft and give a key for the CA/Loctite to lock onto.
This is just the same as rubbing down a fibreglass canopy to give the paint something to stick to.
.

Ian Contessa
Team Robbe SchluterUK
Midland Helicopters

Personally I never liked the idea of glueing the pinion and never used it.

You've never had a pinion come loose? Had my first forced auto a few years ago when a pinion came loose. Since then I have always Loctited them on to the motor shaft.

Been saying that for 2 years now same thing with the 500 set
they should call themselves RC SCREWS U's

I've actually been pretty happy with the larger screw sets, just not the 250 set. What problems did you have with the 500 set? I just wish the owner of the company wasn't such so rude. He tried 3 times to deliver me a 250 set which would work correctly, and I sent him screw samples to examine and lots of documentation, but in the end it was just a waste of time and I gave up. He would say things like, "maybe there is metal filings inside the metal block" when in reality he just refused to cut the threads the correct pitch. You'd think a manufacturer would want to work with the buyers to get a product which everybody liked, but the owner of RCScrews justs likes to be thick headed and think he is always right.

Avant RC
Scorpion Power Systems
Thunder Power RC
Kontronik Drives

okay so i got the little bugger up flying today, and its not very stable.
I think i need a ball link resizing tool, does anyone know where i can get one that works on the 250.

I have a nice swashplate leveling tool but I can take the head off since my head bolt is stripped to use it.

Also can anyone tell me how they setup the gyro with the Dx7
do u use the gear atv or do u enable the gyro under the gear channel, if so how do u setup your gyro page. I am at 30 something on my gain, and it says I should try to get it around 70% but im not sure if thats possible. I guess I would have to shorten the control arm.

Heli Direct has a link tool for it.

cool thanks

just take your pilers and pinch them. That works great.

I just put some Tri-flow on my ball links and now they are smooth. There is not really enough material there to resize them.

Avant RC
Scorpion Power Systems
Thunder Power RC
Kontronik Drives

Hey,

Resizing the links is by far the best way to ease the links, squeezings ok but at this size of link a bit hit or miss.

There are dedicated sizing tools available, but if you have a spare steel ball and one of the hexagonal boom clamp bars spare you can make one.
What I did was loctite the steel ball into the hex bar and then usings a dremmel cut off wheel cut two slots in the steel ball to act as cutting edges.
Pop this steel ball into the plastic link end and rotate a few times, check fit on matching ball and keep sizing till just right.
Simple and cheap.
.

Ian Contessa
Team Robbe SchluterUK
Midland Helicopters

Also can anyone tell me how they setup the gyro with the Dx7
do u use the gear atv or do u enable the gyro under the gear channel, if so how do u setup your gyro page. I am at 30 something on my gain, and it says I should try to get it around 70% but im not sure if thats possible.

Everything you'd ever want to know about the DX7 and gyro control:

http://rc.runryder.com/helicopter/p4285239/

The link contains some GY401 specific info, but has a very good description of how to use the Gyro Sense mode, how to have it control the gyro using channel 7 OR channel 5, and if you need to, how to control it using channel 5 and the gear switch.

Make a ball-link sizer from a spare ball and hex-standoff found in your kit. I'll dig mine out later today and shoot/post some pics. Only takes a minute and costs nothing.

-----

As for the pinion, clean the bore of the pinion and the motor shaft. I used alcohol, and wiped it dry. Apply a small amount of the green R48 to the end of the shaft, install the pinion, twisting slightly to distribute the R48, let it sit overnight. Holds like a bear. When you need to remove it, heat the end of the shaft with a soldering iron or small torch. It doesn't take a lot of heat, pull the pinion off. Clean the shaft, you're ready to do whatever you want with a new pinion.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz