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United States, MD
Joined Apr 2011
301 Posts
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I have owned many helis, including coaxial, fixed pitch and collective pitch. Looking back, comparing what you get from a Walkera product, Blade does not match it. Maybe you are correct in that the 450X will be the one Horizon wants to market the most and provide the money worth. But still, you will be dealing with a plastic heli versus a cnc one (V450). The electronics on the 450X will be better, but not the mechanics. |
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Okay, so i had posted recently about the tail rocker screw sheering on me. It happened again. The 1mm screw is just not taking the stress and i think it may have had something to do with the wagging and not holding the tail too. I didn't take a lot of pictures, but you can get the main idea.
#19: 4f200 Tail rocker screw upgrade to 2mm |
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Joined Aug 2011
214 Posts
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Recently just found out why my 4f200 tail is not holding as good as hk250clone with upgrade of Rx2618 new receiver.
Until today I was trying to do some checking on the tail servo ball hole. I was thinking to relocate the lingkage ball closer to servo drive gear may improve the tail holding. To my surprise when I closer inspect the horn travel for Align DS420 rudder servo, the Align servo was jitter at 10% rudder stick input. With gyro holding mode same jitter happen when servo is travel around 10%. This is really surprise me with the reputation Align digital servo use for rudder. I had bought 2 DS420 servo, first one got burn on 250 clone and this is the 2nd pcs fail with jitter ouput. The Align servo was install together with Rx2618 upgrade. It was first holding ok only but not as good as other 250clone. Then the tail start having some little soft wagging after some flights. Will never bought Align servo again, cost so much yet poor performance. I had 4 inolab install on all clones, none of them has fail yet. Will see how does it perform on 4f200 with rx2618 receiver. |
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Align servos are made by Savox. I prefer to buy direct from Savox. Regardless, i find these brands to be the minimum requirements. They are not great, they simply work. In the bigger size 500+ servos. Savox is pretty good. But the 450 size Savox / Align potentiometer is very cheap and ends up developing unfixable slop, which will eventually effect flight. Probably more so on the tail. I think the Savox servo i used on my tail had the same issue. The ino-lab servo is working great for me now. But the speed and torque of it broke the 1mm screw that holds the pitch rocker, two times. |
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Oh yeah, metal gear servos are absolutely useless on a tail servo. With Align/Savox servos. The slop is not from the metal gears though. But metal gears usually do have more slop. The align/Savox servo just have a very cheap potentiometer. The potentiometer goes bad at one point or even whole section's of the sensor's contact path. Those bad parts on the contact path will jitter the servo. I have not, and i don't know anyone who has stripped a tail servo in a crash. It's pretty damn rare. You'd have to stick the blade grip in the ground and twist or something, it wouldn't be easy. Not to mention metal gears are heavy, no point in having that either, right?
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Well, i finally got to go out yesterday after work and put 3 packs though the 4f200C at the field. It was gusting up to around 17 mph at times. But it was pretty calm compared to the last few days prior. The tail on my heli is basically setup for near zero pitch. I don't think i needed too anymore, but i have it a few twists so the tail is mechanically pitched slightly to the right. So far the 2mm tail rocker bolt is holding and the heli is flying great. I have to say the 2702V is working pretty decent. But it still doesn't fly as smooth as my beastX helis. But it's ripping pretty good now.
And then later on, after a flight i slapped the tail on my X5 and had to fix 1 of the gears. Could be worse, but i got in two flights before it happened. The irony is flight 199 went fine, but right at the end of flight 200 i take the tail gear out! |
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United States, MD
Joined Apr 2011
301 Posts
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Last few times I thought I would have stripped a tail servo. Instead of the servo stripping the plastic tip on the linkage rod broke first. one time I even had the rocker break on my 450. No servo damage. it always seems to be absorbed by the rudder rod or other parts break first. It's not impossible, it's just so unlikely it's just not worth worrying about. like terrorist attacks, or gun violence.
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Joined Sep 2012
319 Posts
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I just found out why my tail of the 4f200 was wagging:
The tail servos seems a little to slow. I mounted the ball-link 1 hole closer to the servo, tail wags more (servo needs to move more for same tail-pitch than ball-link in mid-posititon). Now mounted the ball link 1 hole to the outside and tail much better (only had a few minutes in the back-garden before it became to dark to test). Servo needs to move less than mid or inner position, so is quicker.... Of course you alway have to change the tail-ext pod on the rx. At the inner position i had to go to max position at tail ext. Perhaps this could help you to reduce tail-wag on your 4f200 |
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Joined Nov 2011
612 Posts
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