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250 Class Electric Helicopters 250 Class Electric Helicopters manufactured by Align, Tarot, SYMA, Airhog, Chaos, HK and similar.


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Old 12-24-2013, 09:35 PM   #1 (permalink)
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Default Trex 250 DFC Plus...just in!!

Just received mine yesterday and no flight yet. Just a few questions:
1. Does this heli need a swasplate leveller?
2. The tail rotor are quiet tight...is this ok or need to be loosen a bit just like the main blade?
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Old 12-24-2013, 11:38 PM   #2 (permalink)
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Do this at your own risk of course !!

My tail blades & the plastic fantastic mains were too tight for me on my first install. I chose to use 300/ or. 600 grit sand paper( I forget which) to take off just enough material off of the root area to make them fit to my liking.

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Old 12-25-2013, 12:46 AM   #3 (permalink)
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Thought so.....
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Old 12-25-2013, 01:41 AM   #4 (permalink)
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Default Trex 250 DFC Plus...just in!!

1. No one needs a swash leveling tool if they own a digital pitch gauge. Do you?

2. You can leave them tight.

FYI. If you fly inverted? you are going to have to double check the roll rate pot on the controller. Mine was all the down from the factory. So you can make it have crazy fast response with expo and it will not want to roll over. Cool feature for a beginner[wish I had it when I was]!!!
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Old 12-25-2013, 02:12 AM   #5 (permalink)
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Yup, I have one (DP)...just maiden it for couples of minutes, I just leave the tail blades as it is, everything stock in the tx except the expo (all 0%, Im used to that with my mcpx & 450s...from my very 1st maiden, its not because I don't need it but I don't lnow the function of expo at that time .......but no 3D for me he he..Im more to scale flying). I must say, this little bugger is quiet stable and already have good settings out of the box, at least for non 3D pilot like me. Now as usuall, Im gonna do some small xmas shopping for needed parts (& mini tools) for the little guy. And...I also looking for alternative hex screws for the 250 (same as my 450 pro, its kinda weak at the head). I replaced all my 450 pro frame (only) hex screws with screws I bought from RCScrewz. Its strong, nice to look at but o boy, it makes my pro weight like a tank. I wonder if theres other alternatives?.......
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Old 12-25-2013, 07:44 AM   #6 (permalink)
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Default Trex 250 DFC Plus...just in!!

It's actually very (very!) crash worthy as it sits! I'm blown away I've hit hard enough to actually bend and twist motor mounts prior to any parts of the frame breaking which have yet to break.
The boom supports break like a twig. But I'm not sure I would even change that, as any boom hits haven't transferred into the frame. Honestly I don't know what I would change at all other than a FG canopy which protects the front very well and will snap the canopy mounts if needed with no other damage.

You asked about swash leaving tool. To adjust the swash and tracking. Level copter on both axis. Set 0 pitch. The blade angle should remain 0 throughout 360 degrees. Stop at each servo link and adjust to achieve 0/360. Move pitch gauge to other blade and adjust blade link to achieve 0 degrees/perfect tracking. As you continue with the rest of the controller setup and radio settings make sure the adjustments made are repeatable. Check em once again after fly'n. If ya crash you can use the same method to see exactly what broke, bent or misaligned effectively.

Expo (+ numbers) moves the sensitivity away from mid stick positions. Negative (very rarely used) will add it. Expo does this without changing servo travel. Or the overall speed of the servo from start to finish as the graph reflects.

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Old 12-25-2013, 08:09 AM   #7 (permalink)
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thanks mate...i think im gonna enjoy this little bugger
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Old 12-25-2013, 08:44 AM   #8 (permalink)
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Default Re: Trex 250 DFC Plus...just in!!

My tail blades were too tight to be flyable. I could barely move them by hand. I have been really happy with my 250 plus.
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Old 12-25-2013, 10:17 AM   #9 (permalink)
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Default Trex 250 DFC Plus...just in!!

Quote:
Originally Posted by Vaeloron View Post
My tail blades were too tight to be flyable. I could barely move them by hand. I have been really happy with my 250 plus.

Huh. So there is not enough centripetal force to center the blades in the grips? You running on 2s or something? The vibration was too much for it huh?


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Old 12-25-2013, 10:27 AM   #10 (permalink)
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Quote:
Originally Posted by Vaeloron View Post
My tail blades were too tight to be flyable. I could barely move them by hand. I have been really happy with my 250 plus.
so you still flying with those tight tail blades or you loosened them?
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Old 12-25-2013, 11:51 AM   #11 (permalink)
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Default Trex 250 DFC Plus...just in!!

There is no harm in flying them tight. They are also on a OWB so there is even less of a reason to run them loose.
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Old 12-25-2013, 12:17 PM   #12 (permalink)
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Quote:
Originally Posted by audacity View Post
There is no harm in flying them tight. They are also on a OWB so there is even less of a reason to run them loose.
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What do you mean "also on a OWB"? I don't follow, sorry.


When I shaved them slightly, it only took a few mins and they now fit much more nicely IMO!
Plus, harm or not, I just prefer any , ESP my tail blades to have a little give in them if I can incase of a blade strike! For me, this seems extra needed with a TT system!

I am admittedly still new to the TT system, having only owned a 130x, and now a 250 pro dfc. Feels like good reasoning to me tho!!
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Old 12-25-2013, 01:00 PM   #13 (permalink)
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Default Re: Trex 250 DFC Plus...just in!!

They were too tight to fly. I could barely move them by hand and there was no way centripetal force was going to move them. I loosened them. Audacity your comment comes off rather rude. Not sure what was wrong with my statement.
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Old 12-25-2013, 01:28 PM   #14 (permalink)
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Default Trex 250 DFC Plus...just in!!

OWB=One way bearing.
The tail blades are only connected to the main blades in one direction. If the motor is not spinning the tail blades are not spinning. Unlike a 130 or any other normal Heli.
The tail blades on this 250 can be set up just like any other full size Heli.
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Old 12-25-2013, 06:47 PM   #15 (permalink)
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Ahh, yea agreed. I see what ya meant now, I knew what a OWB is but was slightly confused by how it was stated I guess. Lol

Merry Christmas all!!,

Seth
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Old 12-25-2013, 07:46 PM   #16 (permalink)
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Merry belated Xmas everyone.....
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Old 12-27-2013, 07:00 AM   #17 (permalink)
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Need your guys input,
At the moment, Im flying in normal mode only, will try IU mode next flight. Im using all stock setup as in the manual (except I put no expo and I change the TT curve a bit). Ok, it is like this:
1. When I do punch, the heli was very lame (ascending) in response and...
2. When I drop the throttle down (descending) then quickly counter it, the response was also lame (almost like a FP heli), I had to throttled up about almost 3/4.
Is this normal with the stock setup (for normal mode) or maybe I have to up the roll rate in the MRS?....
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Old 12-27-2013, 12:37 PM   #18 (permalink)
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Default Re: Trex 250 DFC Plus...just in!!

Thats the infamous heavy disc loading you are feeling. Disc loading is the ratio of heli weight to rotor disc diameter and the 250 is very heavy for its tiny rotor, it has plenty of power to cope with the weight but it's always going to drop like a brick when power is removed. Idle up will help with that a lot. This is one of the reasons that the 250 is such a difficult heli to fly. Understand that this heli just flies differently from every other heli out there. There is nothing wrong with it and very little that can be done about it. When you do start using idle up DO NOT switch to idle up in flight. While on the ground set throttle hold. Go to just below mid stick. Turn on idle up and then switch off throttle hold. The soft start will gently spool the heli up. If you switch to idle up in flight you will likely strip your pinion off of the motor shaft. The 250 does not ease into idle up and the instant headspeed change is too much for the pinion that is essentially glued to the motor shaft.
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Old 12-27-2013, 02:33 PM   #19 (permalink)
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Default Trex 250 DFC Plus...just in!!

Roll rate does some VERY strange things! Never had a mrs. Only beastx's in 450's-goblins's.
While I thought it was set to just above 1/2 way. It was basically off. Pulling all expo and even negative expo made it quick in response but any large input; it wasn't having it. This is even after going to 100% TC. It wAs doing everything it could not to go inverted. Our weather has been rotten. High winds and freezing rain and snow. So I haven't fully found the best setting yet.

O, just adjust the servo speed of the throttle to soft'n the hit if using IU in flight! It will behave more like a programable esc.
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Last edited by audacity; 12-27-2013 at 05:12 PM..
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Old 12-27-2013, 02:40 PM   #20 (permalink)
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Default Re: Trex 250 DFC Plus...just in!!

Quote:
Originally Posted by audacity View Post
O, just adjust the servo speed of the throttle to soft'n the hit if using IU in flight! It will behave more like a programable esc.
Never thought to try that. Might be a good idea. I will have to play with it.
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