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Old 06-15-2012, 01:55 PM   #1 (permalink)
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Default maybe motor or ESC???

So i recently crashed one of my SR's. i just rebuilt it, it wasnt to bad in damages. so i just took it to the park to test it out and it was acting strange. i would spool up and i could have it at full throttle and it would just sit there and the blades are spinning way fast but no take off. then all of the sudden after a few seconds of sitting there it would jump into the air real fast and after that it would fly fine. it seemed like i had to give it a little more throttle for everything tho. so what do you all think is wrong? the only thing i did differently on rebuild was i stiffend up the head with the dampeners and put extra rings in there. is my pitch way off now?
any ideas?

Last edited by Orangephoner; 06-16-2012 at 04:54 PM..
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Old 06-15-2012, 03:26 PM   #2 (permalink)
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I too have 2 sr's one flies great the onther one doe's exactlly what you describe i'm currently going trough and redoing setup from servos up, centering servo arms checking links leveling swash i have found a lot of things way off. You may want to do the same thing, i did it with my other one because i bought it wrecked for $65.00 so when i got done it flies great!
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Old 06-15-2012, 03:30 PM   #3 (permalink)
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Ill have to go thru and check. That's funny tho cause I bought my 2 nd sr on ebay wrecked for 70 and it flys the best. Ha very similar

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Old 06-15-2012, 04:30 PM   #4 (permalink)
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Make sure your main shaft collar is tight and installed correctly, aka you can't grab the head and pull the main shaft up and down. Also make sure your mixer arms and blade grips are installed properly and not binding. Unplug your main and tail motors and cycle your throttle up and down to see what is going on. I included a pic of what your mixer arms should look like.

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Old 06-15-2012, 06:34 PM   #5 (permalink)
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+1 to the main shaft collar!
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Old 06-15-2012, 09:23 PM   #6 (permalink)
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Well I checked the collar and I had to move it down more. But it still isn't taking off or flying well. I'm going to check the flybar paddles and the pitch. Mayb it doesn't have enough positive pitch?

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Old 06-15-2012, 09:31 PM   #7 (permalink)
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Get yourself a pitch gauge if you don't have one already. You can eyeball it for zero and see if high/low look equivalent, but a gauge is so much better. +/- 10 is good.
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Old 06-15-2012, 09:42 PM   #8 (permalink)
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What is a good pitch gauge for the sr?

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Old 06-16-2012, 05:38 AM   #9 (permalink)
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If you want to spend the money, this is a well built gauge and has an insert to use on smaller blades like the SR.
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Old 06-16-2012, 06:32 AM   #10 (permalink)
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http://www.hobbyking.com/hobbyking/s...dProduct=11044

1.50$ for the same thing, I have one and works fine.
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Old 06-16-2012, 06:47 AM   #11 (permalink)
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So the one from hk fits the sr good? How is the quality of it?

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Old 06-16-2012, 07:17 AM   #12 (permalink)
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I have one in my Heli tool kit that looks like the one from HK and it fits the standard SR blades fine.
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Old 06-16-2012, 04:52 PM   #13 (permalink)
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so i am still super stumped about my SR. i just tryed flying it agian and its doing the same thing i was adjusting the pitch to see if that helped but it didnt. but this time while flying the tail went crazy and pushed to the right. i toned it down but its still not flying right. it will start hovering about an inch above the ground at almost full throttle and then later it will shoot up in the air and it will only need about half throttle to hover at 6 feet up. the crash i mentioned earlyer was pretty much all on the nose. it actually broke the nose of the heli off and put my battery out of use. i had to buy a new battery. do you think the esc somehow got messed up? or the motor?
thank you for any replies.
this can be stressful
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Old 06-16-2012, 05:18 PM   #14 (permalink)
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A hard crash can cause the ESC to fail or act erratic according to HH. However, I really would be looking at a mechanical issue though based on what you are saying. It almost sounds like the swash plate is losing it's inner plate position causing swash separation and then reseating itself when in the air. I would closely check that swashplate.
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Old 06-16-2012, 05:24 PM   #15 (permalink)
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Look at the swash & the servo movements, if the main gear doesn't have any play. It's possible the main gear's screw is busted & it's slipping there, or even maybe a loose motor pinion gear....
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Old 06-16-2012, 06:10 PM   #16 (permalink)
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So when the SR jumps into the air, does the head or motor speed change or is it just a change in the linkage (pitch)? That should eliminate any thoughts of the ESC being bad or pinion slipping, but if something sounds like it is changing rpms, you have more work to do for sure.
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Old 06-16-2012, 06:12 PM   #17 (permalink)
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Quote:
Originally Posted by Velislide View Post
http://www.hobbyking.com/hobbyking/s...dProduct=11044

1.50$ for the same thing, I have one and works fine.
Just to clarify, the two gauges both check the blade pitch but they are not the same thing.
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Last edited by olemil; 06-17-2012 at 05:32 AM..
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Old 06-16-2012, 09:48 PM   #18 (permalink)
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No it doesn't change rpms I don't think. Its almost sounding like the swash. Ill have to check when I get home. But more suggestions always welcome

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Old 06-16-2012, 09:58 PM   #19 (permalink)
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you can go into swash menu go to pitch unplug motor and tail motor then plug in battery, then dial in more neg in pitch and you can watch the swash move down all three servos will move. It sounds like your swash is too high possibly hitting the top anyway i have had to do this before after a rebuild because it wanted to lift off the ground at 3/4 stick and i like mine to rise at 1/4 stick. a lot of guys run at -36 i'm running at about -43. Good luck!!
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Old 06-16-2012, 11:38 PM   #20 (permalink)
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+1 to checking the swash, but if it IS a swash problem, I don't see how it would suddenly sandwich itself together to give you lift. If it's suddenly jumping into the air it would mean the swash halves would have to be pressing back together? Still, swash issues are always suspect. And if this is a rebuild from a crash, check to make sure the servos move through their full travel with no binding or jumping when not powered up (move them by hand). Sounds like the servos are hunting and have missing gear teeth and when they DO grab it launches. To be certain, you can push collective stick almost full up, get no lift and then with no further input on any stick it'll jump in the air? If that's the case, definitely a mechanical thing, look for cracked or binding links/mixer arms and any links that aren't set right on the balls or have pushed onto the inside of the ball.
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