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Thunder Raptor 90/G4 Thunder Tiger Raptor 90/G4 Helicopters |
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04-22-2013, 10:54 AM | #1 (permalink) |
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Gear ratio/Headspeed - G4/.91hz-r
The gear ratio on the G4 is 7,929
The recomended rpm unloaded on the .91hz i've read is 16000 (so 15000 when loaded. Is this correct?). 16000/7,929 gives a headspeed of 2017 rpm. Is the optimal headspeed 2017 rpm from the governor?
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04-22-2013, 01:01 PM | #2 (permalink) |
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The recomended HS on the Trex 700n/.91hz is 1950 with a 8,2 gear ratio (16000/8,2=1951)
Higher HS pulls more power, that may influence on what works best.
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04-22-2013, 01:07 PM | #3 (permalink) |
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Gear ratio/Headspeed - G4/.91hz-r
Edit posted in wrong forum I don't have a raptor I don't like giving advice on something I don't fly.. Sorry 700n is also 8.2 and I got lost
I tried 2000rpm on that motor + Hatori pipe it doesn't sit in the sweet spot very well.. It does a better job at 1850 - 1950 than at 2000 and it seems to like 1950 the best.. I personally like very high headspeed but the motor doesn't on this gearing
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04-22-2013, 01:33 PM | #4 (permalink) |
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Gear ratio/Headspeed - Raptor G4/.91hz-r
The gear ratio on the G4 is 7,929
The recomended rpm unloaded on the .91hz i've read is 16000 (so 15000 when loaded. Is this correct?). 16000/7,929 gives a headspeed of 2017 rpm. Is the optimal headspeed 2017 rpm from the governor? The recomended HS on the Trex 700n/.91hz is 1950 with a 8,2 gear ratio (16000/8,2=1951) Higher HS pulls more power, that may influence on what works best. Anyone?
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04-22-2013, 02:06 PM | #5 (permalink) |
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Join Date: Sep 2006
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With that gear ratio I would run it at 2,000 headspeed, putting the engine right around 16,000. 1950 works great on the Trex 700 as you stated with the 8.2 to 1 gear ratio.
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04-23-2013, 04:11 PM | #6 (permalink) |
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Join Date: May 2011
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I run IU1 at 1850 and IU2 at 1990
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04-25-2013, 12:17 AM | #7 (permalink) |
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Gear ratio/Headspeed - G4/.91hz-r
I run mine in and around 1850 (sport flyer with a little 3D).
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04-25-2013, 03:59 PM | #8 (permalink) |
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My question is what headspeed will make the motor work at its peak performance
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05-05-2013, 02:54 AM | #10 (permalink) | |
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Join Date: Jan 2008
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Quote:
I would suggest to test it yourself for best results. Try different head speeds and see where the motor is happiest. Careful not too use too much pitch. 11 - 13 degrees should be ok depending on HS. I run 13 degrees at 1850 with the redline 11 motor. 2000 I go down to 11 degrees. |
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05-16-2013, 07:28 AM | #11 (permalink) | |
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Quote:
Thanks Marco!
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