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Home✈️Aircraft🚁HelicopterAlignT-REX 700N › 700n gear ratio
12-31-2012 11:56 PM  7 years ago
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rilopez825

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Pembroke Pines, FL

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700n gear ratio
Is anyone changing the gear ratio when going to the os105?
Richard
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01-01-2013 07:02 AM  7 years ago
Glenn Goodlett

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California

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8.0 with a YS 1.20 here.
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01-01-2013 09:31 AM  7 years ago
Wesley-G

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Elmont NY

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I have and the motor loves it running 2050 idle-up1 2100 idle-up2
edge 713 flybar blades the machine like a rocket ship. The heli will sound different that's from the slant gear breaking in pay it no
attention.
Team Minicopter-Team MKS-Team Byron fuels-Team Pulse Batteries
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01-01-2013 09:35 AM  7 years ago
rilopez825

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Pembroke Pines, FL

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@Wesley-G
Where did you find the gears to change the ratio?
Richard
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01-01-2013 11:48 AM  7 years ago
Flat Eric

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United Kingdom

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Is there a big difference flying with the 713 blades over the 690 blades?
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01-01-2013 02:10 PM  7 years ago
nickwap

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Berwick-upon-Tweed, Northumberland, England

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YS 120 on mine - I fitted the M1 Slant gears

H70020T - CNC SLANT THREAD MAIN DRIVE GEAR/112T (H70020B
HN7126T - Align T-Rex 700 M1 Engine Helical Gear Set / 14 Tooth
HN7125T - 700N 104T M1 Helical Auto Tail Gear Set

112/14 = 8.0

Also speeds the Tail up that also helps.

These are the Align parts, there are also KDE etc but these work ok for me all from Midland Heli

Nick
"Give me another one, this one's broke!"
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01-02-2013 02:53 AM  7 years ago
knightofcarnage

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chicago

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The new tail gear ratio is great.
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01-02-2013 12:32 PM  7 years ago
Richie Sabin

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Niagara Falls, NY

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If you want to change the gear ratio to 8.2 you have to use the older nitro main and pinion gear. These are straight cut not slant.

HN7019-4- 164t main gear
HN7037- Pinion gear
Rich Sabin
Team Align
Team Thunder Power
Morgan Fuels
Hatori Mufflers
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01-29-2013 05:42 PM  7 years ago
rilopez825

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Pembroke Pines, FL

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Thank you nickwap. I'm finally getting around to ordering the new gears.Richard
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02-13-2013 04:26 PM  7 years ago
BigMc70

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Abilene, Texas-USA

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Im running the align 91h with the 8.0 ratio @ 2025 headspeed and loving it.Raymond McFaul
Team Grand RC
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02-15-2013 08:16 PM  7 years ago
rilopez825

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Pembroke Pines, FL

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That 8.0 ratio really is awesome. The heli is really alive now.

I couldn't believe how much different it feels.

I am running 2100 RPM's on the OS.105
Richard
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04-18-2013 04:20 AM  7 years ago
towertsk

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Chula Vista, CA

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I'd like to try this. Any issues with gear mesh or mods needed?
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04-18-2013 02:18 PM  7 years ago
knightofcarnage

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chicago

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You need to replace the main gear at least. Also i would replace every gear to the new harden black gears, for 2 reasons. 1) the new nitro gear set gives a faster tail speed. 2) the new tail shaft is beefier. Also the tail shafe comes with a new tail hub.

Here is a full list from the new stuff:

HN7126
M1 Engine Helical Gear Set/14T

H70G002XXW
CNC Slant Thread Main Drive Gear/112T

H70G007XXW
104T M1 Autorotation tail drive gear set

H7NG001AXW
M1 Torque Tube Front Drive Gear Set/21T

H70G005XXW
Torque Tube Rear Drive Gear Set
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04-19-2013 06:47 PM  7 years ago
rilopez825

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Pembroke Pines, FL

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something wasn't happy on my heli. I was flying it with the 8.0 ratio and the align pinion gear broke.

what I found when I took everything apart was the bells threads or the pinion threads gave out. I will never know as they are stuck to each other but are completely worthless and the pinion free floats on the bells threads.
Richard
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04-19-2013 07:15 PM  7 years ago
Glenn Goodlett

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California

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I've never heard of that happening before.
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04-19-2013 08:50 PM  7 years ago
rilopez825

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Pembroke Pines, FL

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Leave it to me.
I also broke the tail shaft once before. Close to the right bearing.
Richard
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04-27-2013 10:10 PM  7 years ago
nitro-rc-heli

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Lebanon,OR

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yes i put the slant gears on main and auto to get 8.0 and also brought the tail up to 4.95. my OS105 loves to run at 2050

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04-28-2013 01:19 AM  7 years ago
NQNA

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USA

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I did
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