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HelicopterHIROBOOther › Pinion gear on XSpec, easy to change?
10-23-2004 07:31 AM  13 years agoPost 1
Henrik Engert

rrKey Veteran

Cedar Park, TX

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Hi,

I just noticed that the XSpec came with the 10t pinion gear already mounted on the clutch bell.

I would like to get 7.92 ratio, so therefore I would have to use th 12t pinion great that also came with the kit.

How easy is to switch? Is the pinion gear threaded on in a special way (Like reverse)?

Any tips?

I think I am correct on the gear ratio?! 95/12= 7.92

Was it a 93 or 95 main gear? (Now I am confused, I better count again)

Thanks

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10-23-2004 09:35 AM  13 years agoPost 2
mrNoodles

rrProfessor

Borlänge, Sweden

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95T maingear

No mumbo jumbo It got normal threads.

Just hold the bell and get a good grip with a pair of pliers on the pinion (wrap a cloth or equal around the pinion so it doesnt get damaged from the pliers jaws).
And the unscrew.
Clead the threads.
Apply Loctite.
And put back the correct pinion.

Good luck.

PS. Using a glove will give you a better grip at the bell, but Im not sure your familiar with winter clothing in the south of Sweden

/Fredrik
'Hm now I just have to find out where to connect the GV1 sensor to the Jazz80 ESC.

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10-23-2004 12:21 PM  13 years agoPost 3
z11355

rrMaster

New England

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make sure to clean the threads on the bell
and pinion. The threads are VERY fine so make
sure you align the pinion correctly before
starting to screw on the pinion. It's easy to
cross-thread the bell if you do not.

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10-23-2004 12:42 PM  13 years agoPost 4
Henrik Engert

rrKey Veteran

Cedar Park, TX

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Hepp

I just changed it with no problems at all. I just wanted to make sure if there was something special to think about. So now I have 7.92. Prefect for my YS91 and FAI flying.

Thanks.
-Hinke

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10-23-2004 01:19 PM  13 years agoPost 5
Alpine

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Lexington, Ky

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Hinke, what headspeed do FAI flyers would use with the setup like yours ? Hover and Foward fly ?

Thanks,
Roberto.

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10-23-2004 01:22 PM  13 years agoPost 6
Henrik Engert

rrKey Veteran

Cedar Park, TX

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Hi

I really don't know. I am a beginner FAI flyer, but I would think they fly something like 1500 - 1550 in hover. 1750 in forward flight.

All I know is that 7.92 is what is recommended for FAI with Freya.

-Hinke

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10-23-2004 01:24 PM  13 years agoPost 7
mrNoodles

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Borlänge, Sweden

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Some of the guys I fly with has the hover rpm set to 1400-1450 and around 1900-1950 for flying.
Thats with YS91 and 7.92 ratio.

/Fredrik
'Hm now I just have to find out where to connect the GV1 sensor to the Jazz80 ESC.

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10-23-2004 01:28 PM  13 years agoPost 8
Henrik Engert

rrKey Veteran

Cedar Park, TX

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See

I learn something new every day. 1900 -1950 sounds high, but it probably works great for 7.92. I know 8.45 you should run 1850.

-Hinke

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10-23-2004 01:29 PM  13 years agoPost 9
mrNoodles

rrProfessor

Borlänge, Sweden

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Or more around 1750.

I know that the figures dont match, but 1750-1800 seems to be what most guys (and girls) runs with 8.45.

1950 with 7,92 puts the engine at 15444rpm and that somewhere around 1000rpm where the YS91 has its power peak.

/Fredrik
'Hm now I just have to find out where to connect the GV1 sensor to the Jazz80 ESC.

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10-23-2004 01:35 PM  13 years agoPost 10
Alpine

rrVeteran

Lexington, Ky

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I figured FAI would require a slower head speed in foward fly and I though 1900 would be high. My Freya has the YS with the 12 pinion and they say the YS runs happiest at 1900 headspeed which makes the motor rpm correct .I just read about the 1900 headspeed and have not try it on the Freya(fairly new) but I will today. I ma just afraid it might become a beast and be too sensitive .

Roberto.

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10-23-2004 01:41 PM  13 years agoPost 11
mrNoodles

rrProfessor

Borlänge, Sweden

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My thoughts..

The higher headspeed compensates for the soft dampening in the head that many FAI fliers uses.
Softer dampening seems to be more forgiving during the hover manouvers (better in vindy conditions).

Keep in mind that Im NO FAI flier

/Fredrik
'Hm now I just have to find out where to connect the GV1 sensor to the Jazz80 ESC.

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10-23-2004 09:36 PM  13 years agoPost 12
I3DM

rrProfessor

Israel

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Yep, 1900 sounds good for YS91 \ 7.92 in F3C flying, the high headspeed \ lower pitch settings allow you to gather more speed in FFF and make your flying manuvers bigger, and like mentioned, it also works better since the head is soft and too low of a headspeed creates a slow response.

www.liorzahavi.com

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10-24-2004 08:37 AM  13 years agoPost 13
Henrik Engert

rrKey Veteran

Cedar Park, TX

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Hi

What pitch settings should be used for FAI? The high stability?

-Hinke

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10-24-2004 09:20 AM  13 years agoPost 14
mrNoodles

rrProfessor

Borlänge, Sweden

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Id say normal.

/Fredrik
'Hm now I just have to find out where to connect the GV1 sensor to the Jazz80 ESC.

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