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04-25-2009 10:00 AM  10 years ago
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deafheliflyer

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Arizona

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Trex 250
Im building a Trex 250 ...

I know everyone is using 520 or spartan with 3400,3500 and 9257...

Im using the stock 750 Align gyro.. with the JR 290g running 6V...

Anyone using the 290 with good results?? mostly for loops, rolls, flips and slow backwards flights.. I have a JR 3400g laying around, I might put it on later on.. was just wondering if others are having good luck with stock gyro and 290g servo

Thanks

Michael
Crash-Prone and overcoming it!!!
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04-25-2009 12:35 PM  10 years ago
LONEWOLF2440

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MYRTLE BEACH S.C

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I think it will work fineMIKADO LOGO 600 TREX 550
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04-25-2009 01:37 PM  10 years ago
snjbird

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Kissimmee, Florida- USA

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+1 Have heard of a few guys having luck with that combo
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04-25-2009 01:49 PM  10 years ago
AltecLansing

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North Carolina

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A buddy of mine is using the 750 gyro with the 290 servo on a 250 and he likes it. He also has a spartan and said that he couldn't tell too much difference between the two gyros to justify the price difference.Man, I miss the eighties.
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04-25-2009 02:04 PM  10 years ago
snjbird

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Kissimmee, Florida- USA

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I have the GP750 that came with my 250, on one of my 500s, it performs very nice on than machine, when I built my 250 the lore was that the GP750 had issue on the small heli... As it turns out the gyro was not the issue, it was a combo of servo, and binding in the tail! If I were building a second 250 I would give the GP750 a try and use a DS290G I have, the same setup your using. I have a Spartan and a DS3500G on mine, and it is "off the hook" fun to fly. But I can still get it to blow out if you over load the head going backwards. But that is true of most helis, the 250 tail is a enigma, it wags if you get the gain high enough to keep the tail in line, and it blows out if it is to low, and that number that is in-between is hard to find, but when you do.... Holy cashnollys is it fun

I would try the 37mm tail blades to start with
I have my ball 5mm out from the center of the output shaft on the rudder servo arm.
Test you tail…with the main blades off, strap it down and use a second tail rod to push the slider from the rear, while you have it spooled up to like 50-70% it will have some resistance, but should not bind, your goal is to get that thing as smooth as you can while it is spinning, it can be smooth while it is static but then bind under load.
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04-25-2009 02:25 PM  10 years ago
cudaboy_71

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sacramento, ca, u.s.

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i'm flying mine with a basic 401/s3154 setup simply because i had both sitting on my shelf at the time. it is 'off the hook' fun, too. i've only gotten the tail to blow out once in extra hard backward flight since rebuilding the tail completely (before that it was crap).

+1 on the 37mm tails as well.

also, i had the plastic pully on the tail shaft spin after only a handful of flights. gluing it back together with CA did the trick. but, i installed the metal pulley as soon as it came out, for peace of mind.

in short, i'd say the combo setup will work fine. but, i'd tear down and rebuild the entire tail assembly just for grins. it really does need to be perfect....something the assemblers in taiwan probably don't have a feel for.

note: i have heard of two local instances of that particular servo being bad out of the box or burning up after only a couple of flights. so, fly with kid gloves for a few flights to make sure you got a good one.
if it ain't broke, break it.
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04-25-2009 03:38 PM  10 years ago
deafheliflyer

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Arizona

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T250
Thanks everyone for the suggestions..

I have the updated kit (with the upgraded tail hub but doesnt look like I have the metal pulley).. I will check again..

I have absobutely no binding in the tail whilst spooling up and whilst on bench.. I drilled a 5mm hole into the horn as well...

Im also sizing the links with the Microheli sizer because seems like my links were VERY tight...

Other than that.. I will report back after I maiden her.

Michael
Crash-Prone and overcoming it!!!
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04-25-2009 04:12 PM  10 years ago
cudaboy_71

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sacramento, ca, u.s.

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I have the updated kit (with the upgraded tail hub but doesnt look like I have the metal pulley).. I will check again..
if you didnt specifically put it on, then you don't have it. the metal pulley is an upgrade, as is the metal version on the front. i have that one in my toolbox too, but havent had occasion to tear down the frame to replace an otherwise fine part.

good luck. sounds like your setup will be solid.
if it ain't broke, break it.
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04-25-2009 05:40 PM  10 years ago
docjoe

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Stockton, CA United States

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I am using the Spartan with the DS290 servo and it seems to be working well for me. I can do most things with it such as hurricanes and flips/loops/rolls and piro flips. I will say that you have to do what you can to try to take out as much binding as you can. There's a lot of areas for binding in the tail. Even with the a silky smooth tail assembly, I found the links were also very tight and had to size the links to take out a lot of the binding due to tight links.

It should be a fine setup. Lots of guys are using that setup.
Joe
We haven't seen Colonel Angus around these parts for years!
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04-28-2009 06:44 AM  10 years ago
deafheliflyer

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Arizona

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yo
Here is an update..

Jr 290 is working pretty well.. I am able to do flips, rolls without the tail blowing out... I did, HOWEVER notice that the T250 is sensitive to gusts of winds.... I had tail wagging at 10 mph winds..

Is that normal? Or should I re-setup the tail in rate mode and try again?

Thanks

Fun little bird.. I am more confident flipping this and doing 3D than with my T500 and 600n among other birds in my fleet!!!
Crash-Prone and overcoming it!!!
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04-28-2009 10:02 AM  10 years ago
Heliguychris

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Perth, West Australia

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They will wag in the wind....

But on the plus side they are tough!..... heres a vid of me decking mine, then, doing a few flips straight after lol
cheers DHF

http://www.youtube.com/watch?v=8PVz...re=channel_page
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05-10-2009 09:19 PM  10 years ago
deafheliflyer

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Arizona

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hi
Update..

Im using the stock gyro with jr 290G on 6V..

Unless the wind is over 10 mph, tail is pretty solid...

I used 5.0mm out from center servo arm and 37mm tail blades (batman style)... My gain is about 29 using GEAR channel on Spektrum (using ATV's)

Im still tlc'ing in rate mode then switching back and seems to be a solid set up

It does bog when the pitch is over 13 -13 but at 11, seems to be a happier medium. Of course Im using Align 205D CF blades and 16t pinion using 100 curves (smiles)

Michael
Crash-Prone and overcoming it!!!
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05-10-2009 11:28 PM  10 years ago
helidevil

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Brunswick, ME

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the stock setup is great! its when the wind picks up that throws off the piro rate.
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