New (?) Tail gears for the Trex 700/800s

[james_2k]

Hi guys,

Was having a look on the (internet) stores for any new goodies. I saw these;

https://www.align-trex.co.uk/helicop...e1g005xxt.html

Basically new front and rear gear sets for the 700 and 800s.

Only thing i noticed that stood out was the fact that the front gear is a 19T as opposed to the 22/23 normally seen. It has to be used with the newer style 102T auto rotation gear (H70G012XXT)


Doesnt that mean a rather excessive tail speed?

Would like to use these new fancy high durability gears but that's a bit of a change from what i currently have installed of 104T/22

Or am i just being dense?

Hope you are all staying safe

[trillian]

Well, it looks like a larger modulus, 1.25 vs 1.0. If both umbrella gears are the same then even if they are less teeth, it won't change the ratio - the ratio will be determined by the auto gear and the gear that is driven by it.

I have the highest tail ratio I could get (5 to 1) as I'm running low headspeeds.

Have the umbrella gears been known to fail ? I had not heard anything.

[james_2k]

Cheers Trillian,

Yeah the umbrellas seem to have larger teeth but i was more meaning the fact that they are to be used with the 102T Auto rotation gear and that would connect with the 19T linked above, giving a ratio of 5.368? Which seems like a fast tail.

So in fairness it may be useful to you if it is indeed the case as it would jack up your tail speed.

I think its a durability thing, but i do like to tinker and upgrade even if its slightly pointless

[trillian]

The front drive gear on that one is 23 tooth mod 1. Only the umbrella gears are 19T 1.25.

I'm pretty sure what I have now is a 105 / 20 tooth. (don't know what the umbrella gears are, I think those stay the same among the various front drive gear options)

[james_2k]

Ohh thats right! I cant read, cheers for that!

Not sure 23T would be much use in my 800 with lowish HS. But i do like the blueness. hmmm

[trillian]

Ohh thats right! I cant read, cheers for that!

Not sure 23T would be much use in my 800 with lowish HS. But i do like the blueness. hmmm

This is the first I have heard about them, so right now I only see the one with the 23 tooth front drive gear. I assume that's the most popular. But maybe they'll also do them for the other gear options. I suppose there's a way to change out the drive gear if you really want to .

I'm running my 800 at about 1300 headspeed with 115 tails, which appeared to work well. But I didn't get much stick time with it last year before the winter set in.

[james_2k]

Sure is Maj, they seem to be keeping the industry going in these hard times!