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Home✈️Aircraft🚁HelicopterHIROBOHirobo SDX › SDX Delrin Tail Gear Question
06-20-2009 11:41 PM  11 years ago
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Mr.Green

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Kaysville, Utah

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SDX Delrin Tail Gear Question
I have an SDX on the way and I want to build it with the delrin main gears and tail gear. I checked and see two different delrin tail gears - one with 17 teeth and the other with 18 teeth. Does anybody know how many teeth the stock SDX tail gear has? I am guessing it's a 17 tooth and the 18 tooth is an option I just want to make sure and order the correct parts.

Doug Green
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06-21-2009 12:10 AM  11 years ago
Quickster

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Victoria, Australia

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The SDX has the 17t as stock. I would stick with this ratio. The 18t is for the Evo 90.
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06-21-2009 03:09 AM  11 years ago
John Benario

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Las Vegas

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The cut gears run a bit truer than the molded gears, but there isn't much benefit to paying the money for the cut gears. If you are looking for beter tail rotor response the thing to do is replace the 16 tooth pulley up front with the Freya 18 tooth pulley.

John Benario
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06-21-2009 03:19 AM  11 years ago
Paul Woodcock

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Dubai - United Arab Emirates

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Hi guys

It is 17t. Just checked the on-line manual.

Regards
Paul
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06-21-2009 01:19 PM  11 years ago
Leif

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USA

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I found that the speedup pulley (the 18T one from the Freya) results in excessive speed on the tail. During high RPM maneuvers the tail RPM gets so high that it results in vibrations, tail hunting and belt noise.

The SDX uses a 90-class tail hub/grips. There is no need to speed up the tail beyond the standard gear ratio.

The 17T delrin counter gear lasts much longer than the stock plastic one. It is a good upgrade for lower noise and increased durability.

Leif
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06-21-2009 04:10 PM  11 years ago
davidevo50

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Montreal, PQ, Canada

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I second that Leif, that's what I've done to my Evo 50 a couple of years ago and when I got my SDX I transferred the gear on it... Works great.LIVE IN THE NOW!
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06-21-2009 04:47 PM  11 years ago
Dr.Ben

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Richmond, VA, USA

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Leif,

Help me with my mental block here:

Since the t/r drives off the OD of the second gear assembly, the FEWER teeth the counter gear has, the FASTER the t/r will be driven. Thus the 17 or even 18 T counter gears should be expected to turn the t/r slower than a 16T variant.

Am I confused?

Ben Minor
Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA
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06-21-2009 05:12 PM  11 years ago
Paul Woodcock

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Dubai - United Arab Emirates

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Hi guys

I think the confusion is gears vs pulleys.

The original question was about the gear. It's 17t.
The thread then jumped to speed up pulleys....

I was confused for a while.

Regards
Paul
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06-21-2009 06:25 PM  11 years ago
Dr.Ben

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Richmond, VA, USA

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Oh.........

More better Paul <g>. I was thinking I needed more coffee<g>.

Ben
Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA
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06-22-2009 04:50 AM  11 years ago
Mr.Green

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Kaysville, Utah

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Thank you for all the inforamtion, it's greatly appreciated.
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