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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 08-12-2018, 05:53 PM   #1 (permalink)
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Default A first time CP heli owner in less than 18h

Yup, ordered my first CP heli, a second hand flybar, all Align Trex 250. Going to pair it up with my Taranis X9D that I use for my quads and whoops. This will be a sleepless night waiting for the heli to arrive 😃
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Old 08-12-2018, 06:51 PM   #2 (permalink)
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With the flybar'd version I very much encourage you to use training gear until you get it setup correctly. This helicopter comes across as twitchy and it isn't the easiest tail to get dialed in. This combination can lead to a little frustration from a tip over landing.

I have used 400 size on a 250 before it has plenty of power to lift them.
https://www.amazon.com/Helicopter-Tr...P95E5XZK8RNSXF
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Old 08-12-2018, 09:11 PM   #3 (permalink)
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This is how I have my training gear set up. It keeps the machine from pogo’ing but prevents a tip over. Quite frankly I don’t see ever taking the training gear off because it is so tippy.

For just basic flight I am using the normal curves from the manual. I limited my full range pitch to 10 degrees and the cyclic pitch on the low side at 5 degrees. If your new to CP and don’t know what those are do some research it’s important. I’m running -30% expo and I’ve gotten it to where it’s very controllable. When you first spoil it up don’t be surprised that the tail wants to make it slide to the left on the floor. You need to pop it into the air and put a little right aileron then get it trimmed so your close to center. It will never be hands off hovering but you don’t want to be off in a quadrant just to hold a spot in a hover.
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Old 08-12-2018, 09:15 PM   #4 (permalink)
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Quote:
Originally Posted by Launch 1 View Post
Yup, ordered my first CP heli, a second hand flybar, all Align Trex 250. Going to pair it up with my Taranis X9D that I use for my quads and whoops. This will be a sleepless night waiting for the heli to arrive 😃
Don’t get frustrated trying to work on it. I had the guys at align tell me I couldn’t have picked a worse first cp heli because it’s so skiddish. These are very difficult to work on because of the size, and you need special tools. Buy a good set of MiP thorp 0.9mm and 1.3mm Allen drivers. Don’t try to use cheap L wrenches the fit is too sloppy and it will ruin the screw heads.

Good luck!
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Old 08-14-2018, 04:58 PM   #5 (permalink)
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Thanks guys for all the info and encouragement. I fly tiny whoops and ~130mm drones (fpv), so working on the Rex is luxury 😃 I set up the chopper with no expo, 12 mode and two lower pitch and expo modes.m

I tried the heli in the bedroom, while hiding behind the door, just to get it light on the skids to make sure everything works.

My plan for the first flight is to get off the ground quickly and then slowly figure it out. If tomorrow there is no wind, I'll maiden it. 🚀
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Old 08-15-2018, 06:40 AM   #6 (permalink)
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Thanks guys for all the info and encouragement. I fly tiny whoops and ~130mm drones (fpv), so working on the Rex is luxury 😃 I set up the chopper with no expo, 12 mode and two lower pitch and expo modes.m

I tried the heli in the bedroom, while hiding behind the door, just to get it light on the skids to make sure everything works.

My plan for the first flight is to get off the ground quickly and then slowly figure it out. If tomorrow there is no wind, I'll maiden it. 🚀
I would highly recommend you watch a finless bob setup video on the 250 rotor head and servos then use the curve from the manual for normal hovering flight, with maximum pitch set at 10 degrees instead of 11. If you have 10 degrees of cyclic pitch that thing will be completely uncontrollable you will be chasing it all over the place.

The 2 pitches you need to check are collective (from the throttle stick) and cyclic (aileron and eleavator). Collective pitch is how much you have when the throttle stick is at high travel and adjusted by pitch in your swash mixing. Cyclic pitch is measured with the collective pitch at zero and full aileron then eleavator and adjusted with the aileron and elevator limits in your swash mixing. Those are the two adjustments you need to make to get yourself down to a reasonable amount of cyclic pitch between 5 and 6 but no more than 6. These things are skiddish and you’ll chase it all over the place and right into something.

T-Rex 250SE (1 min 57 sec)

That’s my 250 before I got it tamed down, I had a moderate amount of control but it was still very intense. Personally I’d say buy a leftover Nine Eagles Solo Pro 228 and practice on that first. I had the helimax version it’s a 45 degree offset flybar and you can spend your flights getting use to the stick mechanics before destroying the 250 chasing it all over the place.
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Old 08-18-2018, 12:10 PM   #7 (permalink)
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All right, so first flight done --> time for new main blades.
ook off, hovered and landed few times. The tail felt horrible, at the end I overcorrected and not being the best in LOS, I managed to land it but rolled over.
Post flight inspecting everything, I noticed that the motor pinion is very loose and that the gyro was set up very wrong. I hadn't noticed it before flying the heli.
Oh well, going to order new blades and time for new flights 👍
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