the 250

[Eric Lewis]

i flew a couple of batteries through it today and i have to say, i dont know why i sold it inthe first place!!!! i might have to upgrade the tail servo though, that servo is a little slow

[mflander]

I have heard a lot of people having good luck with the 9257 on the tail.

Do you have a slight wag in the tail at hover? Most of them do. Supposedly gets better with a better tail servo.

I really like the way mine flies, but I am sick and tired of waiting for parts for it lol.

Also, if you haven't already, put in the balls on the main grips with permanent thread lock. If they loosen up at all during flight they will round the holes out and never stay tight again. The main grip set is $20, one of the most expensive parts on the entire heli.

Bring yours with tonight will ya? I want to fly it at the church to see how it feels.

[Jake]

you're kidding about the 9257 right? I know you already run 1320 packs; with a 9257 it might as well be a 400... :)

[MikeB]

Actually I just moved the GP750 to my 500 and I'm putting a GY401/9257 on my 250.

Sick of the tail problems on it.

[mflander]

you're kidding about the 9257 right? I know you already run 1320 packs; with a 9257 it might as well be a 400... :)

the 1320 pack is strickly for hovering etc. I run the tenergy 850 packs for 3d flight.

Most of the guys running 250's are running larger tail servo's. Szabo uses a align 520. 9257's, ds520's, and 3500g's seem to be the servo's of choice for the 250.

[MikeB]

actually I'm going to try a 3400G.

[mflander]

So the problem with my tail was binding. Got it fixed and decided to put the 9257 on it anyways. Went out and flew it at 11:00pm. HOLY CRAP. Completely differently heli. The tail is ROCK solid. I increased my gain by 10% and still could have gone more. That tail isn't budging anymore.

So anyways I hovered around for 2-3 minutes and did some backwards flight with it.

Then I decided to roll it with the increased negative pitch I put in to see how it did. Unfortunately I was not in idle up.
Busted the feathering shaft and broke the blades and gear.

I would love this helicopter a lot more if I could it to last more than 1 day lol.

Seriously Eric, put a better tail servo on it. You won't believe the difference it makes. Solid.

[MikeB]

Just spool it up on the ground and put it in Idle 2 before you lift off.

No reason to fly that heli in normal. You know you'll have it upside down.

[mflander]

Yeah well I was flying in the dark just testing the tail and was bouncing back and forth between normal and idle up. It was really too dark to even be flipping it but I talked myself into it. Wish I hadn't now lol.

[Eric Lewis]

you took the last 9257 mike...i guess i will have to be the tail servo until more come in

[MikeB]

I'm still wiring the GY401/3400G combo. Try it later tonight. It won't be anything as nice as the GP750/9257 but I think it will be enough for me (for now). The GP750's working very well so far on the 500.

[MikeB]

Well I refrained from putting a larger servo on the back. Tried the gy401/DS420 combo. Held without problems in one hell of a cross wind so I'm happy.

[Eric Lewis]

but mike...will it do a tail slide from out of sight? (about 40 feet)


lol

[MikeB]

That's assuming I can do a tail slide without crashing it :D I'd rather loose the tail on the 250 than the 500 hehe. When my significant other finds a job :arrrggghhh: I'll get a Mini G for it :) So maybe in a couple years at the rate she's going. :words:

[mflander]

Well I got my 250 going again last night and put a pack through it. The 205 blades are definitely not as poppy as the 205d's but they work well enough. I have some cheapo frp fiberglass and cf blades on the way so we'll see if they make a difference or not.

Managed to actually fly the thing and it lived to fight another day. Success! I even remembered to put it in idle up before I flipped it lol.

[MikeB]

After flying the Align 325 fibers, I vote that fiber blades are just bad. The wooden blades felt so much better and the CF even better than the woodies. I'm betting the fiber blades feel alot like the plastic blades and may even feel heavier.

Curious to find out.

[Eric Lewis]

just flew 3 more batteries into the little guy and i think i am getting over confident..i managed to do about 3 backwards hurricanes but the tail is definately not fast...might need to get a 9257 soon

[MikeB]

I'm replacing the servo after all. I think the crosswind was actually hiding my wag hehe.

[MikeB]

How did you change the linkage for the servo? Did you use the small ball on the larger arm or change it to use a larger ball link? :confused::)

[Eric Lewis]

most people are using the same ball. Some are taking carbon tubes and putting them over the stock tail linkage also to stiffen it up and you dont need the guides then either

[mflander]

I used the same ball and cut all the arms off of a horn. Leave enough material to make a hole 4.5mm from center. I then mounted the horn. Heat up a t-pin and push it through the horn to make a hole on the top 90 degrees to the tail. Thread the ball in, take it out, ca the hole, and thread it back in.

I then put some carbon over the linkage. Like Eric said, you no longer use the guide. I had some carbon here that fit over the ends of the ball links. So I cut the carbon to size and glued it directly to the ball links(the metal rod is still inside).You will have to cut a couple mm off each end of the rod and thread the ball links all the way on to the linkage to make it work.

With the 750 gyro you do not have to set it up in rate mode for it to work well in HH. So all you need to do is make sure the slider is close to center and your done. Set the limits on your gyro and go fly.

If you have to set the gyro up in rate mode to work right in HH you will have to do the linkage differently because you will need to be able to adjust it.

[MikeB]

Thanks, much better than my solution. I used the super small arm that comes with the JR servo's. Put a standard ball on it. Removed the existing link and threaded a 450 link in the rod with some CA. I checked and the 450 link actually catches some threats supprisingly. I left the guide and let the rod bend a bit, servo has plently of torque and doesn't seem to mind. I need to play with the delay a lil I think but it's for sure the first time I've ever seen the tail stay that still.

Prolly fix it later but I wanted a fast solution to try it out.

edit: Forgot to mention my rods too long so I had to skew the geometry, 90 degree's not so much lol. The limits came out perfect tho.

[MikeB]

3400G servo is working like a champ, throw that DS420 away even if it's working for you. I'm actually enjoying the 250 now.

[Eric Lewis]

i am probably going to throw on a 9257, i like it when the tail doesnt hold, cant even imagine it holding. will be interesting