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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 02-10-2014, 08:25 PM   #1 (permalink)
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Unhappy Major collective instability

So I just set up my 250 Plus DFC BNF and took it out to fly. I got it into a nice hover then I went to lower it down a bit and it almost crashed into the ground it fell so fast, added a tad of collective and it shot into the air, lowered collective just a bit and it almost fell again.

It feels like my first ever attempt at collective pitch flying. My swash plate halves have in my opinion way too much movement. More than all of my plastic horizon hobby products swash plates

I know people say these feel heavy around midstick but theres no way its this bad. Do I have a bad swash? I will upload a video of the swash play and post it in a bit.
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Old 02-10-2014, 08:28 PM   #2 (permalink)
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Trex 250 swash (0 min 18 sec)
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Old 02-10-2014, 10:34 PM   #3 (permalink)
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That amount of play is what all of my 250 swash plates have had. What you're feeling when you fly is the way the 250 flies. It's the heavy disc feeling. You can help by running 12-13 degrees of pitch or running an s curve on your pitch. Also, 100% throttle helps. Check out the lightweight 250 thread. Lots of good info there to lighten it up and help it fly snappier too.
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Old 02-10-2014, 10:55 PM   #4 (permalink)
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Quote:
Originally Posted by jimmy77611 View Post
That amount of play is what all of my 250 swash plates have had. What you're feeling when you fly is the way the 250 flies. It's the heavy disc feeling. You can help by running 12-13 degrees of pitch or running an s curve on your pitch. Also, 100% throttle helps. Check out the lightweight 250 thread. Lots of good info there to lighten it up and help it fly snappier too.
I'm currently running 12 degrees pitch and only ran it at 90% throttle till I get my scorpion pinion with the set screw. I fear of the pinion coming off lol

I will look into trying a S curve on the pitch and have seen quite a few of the lightweight options. I just had hoped it would have been a little more flyable. Its like a really fast yo-yo that is worse than 130x linear servos when they develop tons of slop.
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Old 02-10-2014, 11:06 PM   #5 (permalink)
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I also had a hard time getting used to the yo-yo effect. At first I could barely land mine without bouncing all over the place. I had a flybarred 250 also, and it seemed better. I think the little bit of extra lift from the paddles helped out a lot.

Try bumping the pitch up to 13 and try that. Couldn't hurt. Try the 100% throttle too.
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Old 02-10-2014, 11:08 PM   #6 (permalink)
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Sounds good I will play so more with it in a more open space. I maddened it in my very very small backyard where most of my test flights take places just hovering and doing piro checks.
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Old 02-10-2014, 11:10 PM   #7 (permalink)
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Also, an unrelated issue - 1 only 1 tail blade grip has all kinds of in and out and side to side play while the other is nice and tight. I'm not getting any wag or anything just don't think it should be like that.
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Old 02-11-2014, 12:46 AM   #8 (permalink)
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The other issues of this that I've found usually indicated binding in the head. Hopefully tomorrow's flight goes better
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Old 02-11-2014, 08:30 AM   #9 (permalink)
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Quote:
Originally Posted by jmtyndall View Post
The other issues of this that I've found usually indicated binding in the head. Hopefully tomorrow's flight goes better
Thanks for the advise!!

Trex 250 stuck blade grip (0 min 26 sec)


This was a BnF model after all and I should have looked it over but was too excited to fly it.

I KNEW this couldn't be how this thing was supposed to fly biased on all the flight videos I e watched. I test flew it this morning and now it is a bit heavy around mid stick like people say but it won't hit the ground or trim my trees without warning like before.

Can't wait to fly it at a park tomorrow now!!
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