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120 SR Blade (eFlite) 120 SR Helicopters Information and Help


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Old 01-23-2012, 06:32 PM   #1 (permalink)
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Default 120SR Blade Balancer

The stud that screws into plastic pushrods for aircraft fit 120SR and MCPX Blades.
Had 2 small washers from a car and the binding nuts for the snap links.

Work like a charm. And available at about any hobby shop for about a buck!!!!
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Old 01-23-2012, 07:17 PM   #2 (permalink)
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Nice idea, got a pic?

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Old 01-24-2012, 09:17 PM   #3 (permalink)
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Default How to go about making the balancer

Scrounged up on old helicopter for some parts.


Removed a pushrod.


Put nut on pushrod all the way to end of thread.


Snip off excess. Leave at least 1/4" unthreaded rod. De burr with file!


Balancer complete.


Install blades and set on 2 inverted pill bottles.


A little red tape so you can see it! I use regular tape on the bottom side of the blades.




MCPX Blades
http://i796.photobucket.com/albums/y...ldblade003.jpg

Top view


Works great and did not cost a penny.
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Old 01-25-2012, 10:29 AM   #4 (permalink)
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Default First pic

What in the world is the first pic of?

Quote:
Originally Posted by Imzzaudae View Post
Scrounged up on old helicopter for some parts.


Removed a pushrod.


Put nut on pushrod all the way to end of thread.


Snip off excess. Leave at least 1/4" unthreaded rod. De burr with file!


Balancer complete.


Install blades and set on 2 inverted pill bottles.


A little red tape so you can see it! I use regular tape on the bottom side of the blades.




MCPX Blades
http://i796.photobucket.com/albums/y...ldblade003.jpg

Top view


Works great and did not cost a penny.
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Old 01-25-2012, 12:22 PM   #5 (permalink)
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Default It's

It's the upper cowl and rotor head off a very old 90 size, Nitro powered Jet Ranger.
I was given the complete helicopter TX and all 20 years ago. may even re build it eventually.
The fuse is fiberglass 5' long The Blades are each 1 meter long and 2" wide.
It's a wall hanging conversation peace in my shop.
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Old 01-25-2012, 07:07 PM   #6 (permalink)
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Very nice little project!! Thanks for all the pics and step by step info....

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Old 01-26-2012, 12:03 AM   #7 (permalink)
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Default Your welcome

Had a good time playing with my shiny new digital camera.
This was my 1st project post. Had a good time doing it. It's surprising the difference a little peace of tape can make to a helicopter. Get it to balance perfectly and the helicopter will not even shutter.
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Old 01-08-2013, 11:42 PM   #8 (permalink)
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Default The Jet Ranger

I said it was 90 power. I lied it's powered buy a .61
Who knows maybe one day it will fly again!
Yes they are floats!

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Old 01-09-2013, 04:15 AM   #9 (permalink)
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Quote:
Originally Posted by Imzzaudae View Post
I said it was 90 power. I lied it's powered buy a .61
Who knows maybe one day it will fly again!
Yes they are floats!

Back when Men were Men!!!!
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Old 01-13-2013, 03:06 PM   #10 (permalink)
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why not just weigh each blade...then you know there balanced
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Old 01-13-2013, 03:34 PM   #11 (permalink)
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Quote:
Originally Posted by Helihellraiser View Post
why not just weigh each blade...then you know there balanced
That doesn't work because extra weight can be carried at different parts of the blade. 2 blades could weigh exactly the same but if the weight is further out on one blade, it'll track differently. Use a gym scale as an example. You slide a weight across a bar in increments of 50 pounds, but that slide weight still weighs the same but is exponential depending where it is on the scale.
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180 CFX, Nano Cpx, Mcpx v2, Mcpx BL, 300X W/ Savox Servos and Don's Wicked, Trex 450L Dominator W/Skookum 720BE and GPS, DX9, (Retired Schluter Scout 60 and Junior 50)
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Old 01-13-2013, 03:41 PM   #12 (permalink)
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Quote:
Originally Posted by whatevva View Post
That doesn't work because extra weight can be carried at different parts of the blade.
Exactly.

Nice explanation!
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Old 01-13-2013, 06:03 PM   #13 (permalink)
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ok...how do you balance them....were do you know where to place the weight?
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Old 01-13-2013, 06:10 PM   #14 (permalink)
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the weight should be the lenght of the blade im assuming?
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Old 01-13-2013, 07:51 PM   #15 (permalink)
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ok...how do you balance them....were do you know where to place the weight?
If you want to do it properly, like they do for "real" rc helis, you find the COG of each blade first and make them equal that way before balancing. Then you add or remove weight at the COG to balance them.
Not really practical on these blades, but that's the ideal way to do it.
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Old 01-21-2013, 12:58 PM   #16 (permalink)
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Can someone please advise how important is it with these smaller helis to balance the blades?

I am still learning and I have smashed one blade but as the other was fine(ish) i only replaced one blade. A few days later and both blades now look a bit worse for wear, but in my inexperienced opinion it does not seem to have any effect at all on the flying (unless im such a novice i am just used to it).

I have a spare set of blades but i was waiting until i can confidently get a nose in hover before i put them on so as not to trash them while still learning.
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Old 01-21-2013, 01:12 PM   #17 (permalink)
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Quote:
Originally Posted by PaulRobo View Post
Can someone please advise how important is it with these smaller helis to balance the blades?

I am still learning and I have smashed one blade but as the other was fine(ish) i only replaced one blade. A few days later and both blades now look a bit worse for wear, but in my inexperienced opinion it does not seem to have any effect at all on the flying (unless im such a novice i am just used to it).

I have a spare set of blades but i was waiting until i can confidently get a nose in hover before i put them on so as not to trash them while still learning.
Honestly, with this heli it's not that important...I've flown with a big chunk out of the blade.

it's when you have a FL gyro that you really have to watch for vibration
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Old 01-21-2013, 02:43 PM   #18 (permalink)
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Thank you whatevva, i'll hold off on putting on the new set of blades untill i know i wont wreck them straight away!!
Forgive my ignorance.... but 'FL gyro' ???
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Old 01-21-2013, 02:49 PM   #19 (permalink)
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Quote:
Originally Posted by PaulRobo View Post
Thank you whatevva, i'll hold off on putting on the new set of blades untill i know i wont wreck them straight away!!
Forgive my ignorance.... but 'FL gyro' ???
FlyBarLess Gyro ...3 axis ...they don't like vibrations at all!
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180 CFX, Nano Cpx, Mcpx v2, Mcpx BL, 300X W/ Savox Servos and Don's Wicked, Trex 450L Dominator W/Skookum 720BE and GPS, DX9, (Retired Schluter Scout 60 and Junior 50)
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Old 01-21-2013, 03:18 PM   #20 (permalink)
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Gotcha!
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