10mm blade trim - HeliFreak
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120 SR Blade (eFlite) 120 SR Helicopters Information and Help


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Old 07-26-2012, 06:31 AM   #1 (permalink)
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Default 10mm blade trim

Does any one have instructions on how to do this or a link to a video showing how?
Edit: Nevermind. I should have dug a little deeper in the threads. I found this when I Googled.
https://www.helifreak.com/showthread.php?t=401091
Comes back to here. So now I have to try it out for myself. After the fire inspector leaves today that is.

Last edited by setishock; 07-26-2012 at 07:52 AM..
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Old 07-26-2012, 10:30 AM   #2 (permalink)
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I don't think shortening the blades creates any sort of fire hazard!...
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Old 07-26-2012, 12:37 PM   #3 (permalink)
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My hotel has a inspection by the fire marshall is what I meant to say. After she leaves I'm gonna try out the blade trim.
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Old 07-26-2012, 04:08 PM   #4 (permalink)
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try 7 mm first and see if you like the results then if you need more agility you can trim some more off but never go beyond 10 mm
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Old 07-29-2012, 08:38 AM   #5 (permalink)
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Not having metric measuring devices around my shop I had to convert to the closest American measurement. 3/8ths which when translated is 9.5mm.
Measured both blades and trimmed them down. Took it outside and got airborne.
It flys a little differently but not a real dramatic change. Indoors is a different story. It takes a lot more throttle to get off the counter. But once in the air it's a lot more stable.
Still it does have a tendency to drift toward the glass doors coming in to the lobby. I would venture she wants to go outside and really strut her stuff.
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Old 07-29-2012, 12:14 PM   #6 (permalink)
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The difference shows more in a light wind, you are able to fight the wind better because of the higher head speed and more responsive cyclic control.
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T-Rex 250 450x 300x 180CFX MCPX-BL B400 130X MCPX 230S NANO-CPX NANO-CPS MSRX 120 SR MSR MCX

IF IT CAN'T BE FIXED WITH DENTAL FLOSS, THEN IT CAN'T BE FIXED..LOL
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Old 07-30-2012, 05:05 PM   #7 (permalink)
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Hey guys, I did the 10mm blade cut today and tried it out. I can't seem to keep the heli in the air and it does not want to climb. I get about 2 feet off the ground and thats it. Any help or watch settings are you guys using? I have the dx6i tx. Thanks.
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Old 07-30-2012, 05:10 PM   #8 (permalink)
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Quote:
Originally Posted by NSFlyer12 View Post
Hey guys, I did the 10mm blade cut today and tried it out. I can't seem to keep the heli in the air and it does not want to climb. I get about 2 feet off the ground and thats it. Any help or watch settings are you guys using? I have the dx6i tx. Thanks.
Sounds like either a bad connection, or a bad motor or battery.

Every 120 I ever owned had 10mm cut off the blades, it does slightly reduce the amount of lift at a given rpm, but that's what raises the head speed, raising the head speed is what improves the stability and the cyclic response.

There should still be plenty of lift to hover and to climb.
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T-Rex 250 450x 300x 180CFX MCPX-BL B400 130X MCPX 230S NANO-CPX NANO-CPS MSRX 120 SR MSR MCX

IF IT CAN'T BE FIXED WITH DENTAL FLOSS, THEN IT CAN'T BE FIXED..LOL
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Old 07-30-2012, 05:13 PM   #9 (permalink)
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Quote:
Originally Posted by Liduno View Post
Sounds like either a bad connection, or a bad motor or battery.

Every 120 I ever owned had 10mm cut off the blades, it does slightly reduce the amount of lift at a given rpm, but that's what raises the head speed, raising the head speed is what improves the stability and the cyclic response.

There should still be plenty of lift to hover and to climb.
Thanks for the quick reply. It could be the batteries. I'm gonna give them a good charge before some more flight time.
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Old 07-30-2012, 05:16 PM   #10 (permalink)
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More than one of the many 120sr's that I have owned also had gear mesh issues, make sure there is a little bit of play between your pinion and main gear.

I had to open the motor mount screw holes in the frame to allow my motor to be moved back to get the mesh correct.
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T-Rex 250 450x 300x 180CFX MCPX-BL B400 130X MCPX 230S NANO-CPX NANO-CPS MSRX 120 SR MSR MCX

IF IT CAN'T BE FIXED WITH DENTAL FLOSS, THEN IT CAN'T BE FIXED..LOL
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Old 07-30-2012, 05:20 PM   #11 (permalink)
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Maybe you have trimmed off just a smidgen more than 10mm. Really anything beyond 10 starts to have negative effect. If your battery is good and If you have another set trim them to be a little bit longer .

For me trimming only 7mm gives the desired effect of increased head speed while retaining more lift
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Old 07-30-2012, 05:25 PM   #12 (permalink)
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Quote:
Originally Posted by jaybird111 View Post
Maybe you have trimmed off just a smidgen more than 10mm. Really anything beyond 10 starts to have negative effect. If your battery is good and If you have another set trim them to be a little bit longer .

For me trimming only 7mm gives the desired effect of increased head speed while retaining more lift
Even with 11 or 12 mm trimmed off he should still have no issues hovering or climbing, he says he can only get a few feet off the ground.
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T-Rex 250 450x 300x 180CFX MCPX-BL B400 130X MCPX 230S NANO-CPX NANO-CPS MSRX 120 SR MSR MCX

IF IT CAN'T BE FIXED WITH DENTAL FLOSS, THEN IT CAN'T BE FIXED..LOL
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Old 07-30-2012, 06:49 PM   #13 (permalink)
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It was the batteries. Charged them up fully and up she goes! I just got this 120 sr and I find it much easier to fly and control than my msrx. Having some fun.
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Old 07-30-2012, 06:57 PM   #14 (permalink)
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Quote:
Originally Posted by NSFlyer12 View Post
It was the batteries. Charged them up fully and up she goes! I just got this 120 sr and I find it much easier to fly and control than my msrx. Having some fun.
They are a great little heli, they take crash too.
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T-Rex 250 450x 300x 180CFX MCPX-BL B400 130X MCPX 230S NANO-CPX NANO-CPS MSRX 120 SR MSR MCX

IF IT CAN'T BE FIXED WITH DENTAL FLOSS, THEN IT CAN'T BE FIXED..LOL
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