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HomeAircraftHelicopterAlignT-REX 700N › Mod 1 Update - What is it?
04-29-2010 12:53 AM  8 years agoPost 1
RockohaulicrrElite Veteran - Canyon Country, CA, USA, 3rd Rock from the Sun - My Posts: All  Forum  Topic

OK, I get it, the Mod 1 has beefier teeth.

But isn't that what the -1 main gear had???

So what is the Mod 1?

I've heard reference to the old -1 as "mod 0.7". So what is the "1" and the "0.7" refering to?

Is the gear ratio different with the Mod 1?

Do you have to get the Mod 1 front TT gearset too? Is this because the auto-rotation gear is smaller/bigger, and the TT gear has to match? Or is this because the autorotation gear has a different cut to the teeth, and the TT has to match?

Does anyone have close-up pictures of this Mod 1 gear?

Here is a pic of the stock gear (Lft) and the -1 gear (Rt):

How does the Mod 1 compare to these???

Saturday morning I flew my helicopter in my pajamas
How it got in my pajamas I'll never know

04-29-2010 01:00 AM  8 years agoPost 2

rrKey Veteran


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Mod 1= less teeth per inch
You can work the ratio out to be the same.

sorry, busy, im sure someone will give a a lot better explanation.

04-29-2010 04:18 AM  8 years agoPost 3


La Vista, NE.

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mod = "module". It refers to the cut of the teeth on the gears roughly equivelant in definition to the "threads per inch" on a bolt.

The stock 700 gears use a mod .7 tooth'd gear. Pinion = 20, main = 164 for a ratio of 8.2

The -1 part number was an update where Align made the 164 tooth main gear slightly beefier and slightly larger for a tighter mesh to help cope with the in-flight main gear stripping problem. Turns out it may have been at least partially due to the clutch pinion block flexing which is why many have installed the metal clutch bearing block (but I haven't because I haven't stripped a gear yet)

The mod 1 gear set is a completely new pinion (14T) and main (115T) based on module 1 teeth. These are bigger beefier teeth that can in theory take more load without stripping. They will also be nosier. Presumably this is roughly timed with the 700E where you can apply more power in a much harsher manner - e.g. slam full voltage from stand still, can't really do that with an I.C. engine.

Gear ratio for the mod 1 gear set = 8.21

Honestly I don't see any benefit unless you are stripping gears all the time. If you are doing that you might want to find out why because many are flying the mod .7 gears without stripping them.

The one part on the new mod 1 gear set that confuses me is why did Align change the tail drive gears to mod 1. I don't think anyone is having problems with that setup in mod .7 gear? Perhaps they lowered the tail drive gear ratio in anticipation of the higher headpseeds that some will run the 700E at. Wouldn't install that on a 700N, personally

04-29-2010 06:07 AM  8 years agoPost 4

rrElite Veteran

Seattle, WA

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The -1 gear is not MOD 1, it's the same as the stock gear which is MOD .7. The -1 gear was made a little different so it shrank less during production making it just a tad larger then the original gear. The purpose was to decrease the amount of gear back lash between the main hear and pinion. People still stripped -1 gears because the back lash was not the entire problem causing stripping.

MOD 1 is a larger pitch teeth and not compatible with MOD .7, in other words you can not mix and match them. If you look at every other 90 on the market, they have MOD 1 gears in them stock from day 1. Align finally got smart and released their own MOD 1 gears and I hope they start including them in kits.

Align makes the main gear and autorotation gear in MOD 1. You don't have to run both, you can run either one separately. However if you run the MOD 1 autorotation then you must also run the front vertical TT MOD 1 gear as well.

04-30-2010 01:47 AM  8 years agoPost 5


Auckland, New Zealand

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Maybe running the mod-1 tail drive gears will mean that the mod-.7 tail box gears will strip first if the tail hits the ground. Many Ppl always complain that the they wish the tail box gears would strip instead of the tail drive gears as the tail box ones are quicker to replace...


04-30-2010 03:41 AM  8 years agoPost 6

rrElite Veteran

Seattle, WA

My Posts: All  Forum  Topic

When you get the tail in the ground the first gears to go are always the front TT bevel gears. The new Align MOD 1 gears are only for the autorotation and straight cut TT gear so it won't help those bevel gears from stripping.

06-02-2014 10:30 PM  4 years agoPost 7


Concord ca USA

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what is mod 1
I bought a used airframe and built it up. It had a bad main gear, so when I went to find a replacement I was surprised at the 115t gear, and the only ones I could find were mod 1. I had never heard of them, but I bought the lynx 115t mod 1 gear and installed it. It worked great, but I never knew what mod 1 was. I searched it, and found this thread. Thanks for explaining it.

Hobby: Meet wallet!

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