Helical pinion

[jaccojenkins72]

Ok are the Helical pinions any better than the straight groved ones? I just baught the 16 tooth and helixal main gear to match and im wondering if its going to be a positive change for my T rex 550

[ssproud]

Originally Posted by jaccojenkins72

Ok are the Helical pinions any better than the straight groved ones? I just baught the 16 tooth and helixal main gear to match and im wondering if its going to be a positive change for my T rex 550

Have you tried this setup yet? I was thinking about getting it also but with the 18t pinion. And also, Does anybody know why the Helical main gear is 188t? The stock main gear is 170t and if you put this 188t helical gear on there the gear ratio will be way off and have too step up your pinion. Does anybody know if this gear is the same pitch teeth also.

[LARRY2716]

From a Machinist point of view:
A helical gear should be quieter and more efficiant, but would need quality gear.
The pinion would create a lateral load on the gear. On a straight pinion the load is only transfered radially.

[weaselbean]

Yes,I to would like to hear some more info on this gear set?I have been looking at it for awhile now.From what I hear Mikado helicopters run these type of gear.I heard you have to turn them when you set the gear mesh and it has to be fairly tight or else it will strip?So if any one out there is flying these please coment on them?

[NRPY]

It's mainly what Larry said: quieter, and helical gears put an axial load on your setup in addition to the normal radial load, so you may also have to get a hub with a different bearing to handle this axial load.


I'll say this though, they are much quieter. All you hear is blade noise.

[1004ron]

Originally Posted by weaselbean

Yes,I to would like to hear some more info on this gear set?I have been looking at it for awhile now.From what I hear Mikado helicopters run these type of gear.I heard you have to turn them when you set the gear mesh and it has to be fairly tight or else it will strip?So if any one out there is flying these please coment on them?

The Mikado's actually use something very different, they use a herringbone gear, and that is most certainly very quiet.

http://en.wikipedia.org/wiki/Gear

Double helical gears, or herringbone gear, overcome the problem of axial thrust presented by "single" helical gears by having two sets of teeth that are set in a V shape

[JustinS]

I have installed the 18T helical pinion & Align 188T helical main, defintely sounds quieter & smoother, worth trying for sure. A bit harder to set a good mesh, might try the KDE mount soon. Not sure why Align made the helical main gear pale blue

[SidewaysLS4]

I threw together a comparison video between the 2 gear types. In person I think it sounds smoother with the Helical gear. Now for Align to make some Helical TT gears! Specs are 17T on the straight gear, 18T on the helical gear. 1700 headspeed on both

Not too smooth at times with the wind...but good enough to compare sound

[ame]http://www.youtube.com/watch?v=ElGfonGomKM[/ame]

[Discount_Bob]

Thanks for that video. There really is a pretty big difference.