Quieting down a T600/T550 scaler with a Helical main gear - RC Groups
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May 01, 2011, 07:12 PM
Redjestird Youser
SidewaysLS4's Avatar

Quieting down a T600/T550 scaler with a Helical main gear

I put the Align T600 Helical main gear on my T550 Jet Ranger to see if I could quiet things down a bit. It seems to have in the main gear noise department, but the TT tail is another noise maker, lol. Anyway, here's some sound comparisons between the 2 gear types. Listening in person, I'd say it is worthwhile converting over, smoother sounding. Specs are straight gear-170T/17T, helical gear-188T/18T, headspeed 1700rpm on both. Pardon the crappy looking flying, too much wind lately, lol.

T600 Straight and Helical gear comparison.wmv (1 min 36 sec)
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May 01, 2011, 11:58 PM
Registered User
Not much difference to me .... may be I need a hearing test.
May 02, 2011, 07:00 AM
Redjestird Youser
SidewaysLS4's Avatar
I know, in person you can pick up the sound difference better. The TT gears are pretty noisy, but the screech of the main gear is reduced. The slant gear is a smaller modulus which helps, and the angle cut assumably helps also. Converting to a belt tail I would imagine would really make things quiet, but the TT sure is simple to assemble...loosen 2 screws and the whole tail comes off . One thing I did notice quickly after converting was tail rotor/fuselage noise. I dont think I'll try to extend that tail shaft, but I'll look into possibly damping some fuselage resonance. The tail noise was quickly noticable directly from the rear spooling up the first time with the slant gear for some reason
Last edited by SidewaysLS4; May 02, 2011 at 07:07 AM.

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