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450 PRO Class Electric Helicopters 450 PRO Class Electric Helicopters manufactured by Align, Tarot, SYMA, Airhog, Chaos, HK and similar. |
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09-20-2012, 07:29 AM | #1 (permalink) |
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Join Date: Sep 2012
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slanted pinion/main gear upgrade question?
So what is the reason that the slanted pinion/main gear is better than the standard straight gears on the older Helis? Any better performance etc....?
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09-20-2012, 07:52 AM | #2 (permalink) |
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There is debate as to if there is a performance improvement or not.
One thing is certain: all other things equal (inc correct mesh), helical gears generate less noise than straight cut. Keep in mind sound is energy, so you could say the helical gears are marginally more efficient just for that fact. Aside from that there is a big can of worms to be opened on this topic
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09-20-2012, 08:03 AM | #3 (permalink) | |
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Quote:
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09-20-2012, 08:28 AM | #4 (permalink) |
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Join Date: Apr 2012
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They both wind up being 10 to 1 ratio. I have a scopion 2221-6 with 4400kv, when running a 12 tooth pinion I could of got head speeds well over 4000rpm. Not that it would of stayed together very long. lol
But I went to a 10t because the 2221-6 likes high rpms and I can still get about 3450 hs which is more than enough. The motor was pulling way to much amps with the 12t on a governor so that's why I went to the 10t. I also tried an 11t but the amp draw was still a little high, but I was trying to govern it at 3250. If I would of pushed it up to 3500-3600 it probably wouldn't have drawn that much amps, but that is a hs I don't really need to use right now with my flying ablility, maybe someday when I become a pro i'll put the 11t back on. lol |
09-20-2012, 11:05 AM | #5 (permalink) | |
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Straight cut main gear has 150 teeth so using a 15 tooth pinion gives a 10/1 ratio Helical/slant cut main gear has 121 teeth so using a 12 tooth pinion would also produce nearly 10/1 ratio
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09-20-2012, 02:31 PM | #6 (permalink) |
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Join Date: Apr 2012
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And the only reason I went that route was because that's what came on my 600, I got the 450 afterwards. So I don't know if their better or not, I just know its working for me with this motor gear combination.
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09-20-2012, 03:15 PM | #7 (permalink) | |
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For example, drop a golf ball on hard concrete, it will bounce several times, making noise each time. Then say you drop a ball of silly putty and it'll just land flat, absorbing all the energy (inefficient), but make less noise than the golf ball. I doubt the performance difference is huge enough to really notice either way, and the noise reduction is a plus.
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09-20-2012, 03:36 PM | #8 (permalink) |
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Join Date: Feb 2012
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And not to forget is the axial load on the motor shaft that comes with the slant cut gear. I'm running slant cut now, but to be honest I think the old straight cut is better. Also, the material in the slant cut pinion is aluminum which I believe has higher friction than the old straight cut steel(?) pinion. Hope they start making herringbone gears and bronze pinions.
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09-20-2012, 06:11 PM | #9 (permalink) |
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Hi, just got my Pro DFC
Do you set the mesh on the helical gears with a similar amount of lash to straight cut gears? Thanks in advance |
09-21-2012, 03:52 AM | #10 (permalink) | |
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We are talking about efficient energy transfer, in your senario with the concrete the golf ball was very inefficient at transferring energy to the other surface and rebounded with a large noise, every time it rebounds it wastes energy that could be transferred to the other surface generating sound, with the silly putty almost all the energy is efficiently transfered from the falling golf ball to the silly putty with little noise.
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09-21-2012, 03:53 AM | #11 (permalink) |
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same
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09-21-2012, 05:30 AM | #13 (permalink) |
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Join Date: May 2012
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Noise is the only difference. Buy ear plugs, easy to setup lol.
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09-21-2012, 10:27 PM | #14 (permalink) |
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Join Date: Aug 2012
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I have the KDE straight cut 150 main and 15 pinion and they actually run very quietly. I never ran them directly back to back with the slants but I didn't notice hardly any increase in noise. When its airborne I mostly just hear the rotor blades in the wind... my buddy's 450 SE on the other hand has some noisy gears.
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10-20-2015, 10:00 PM | #15 (permalink) |
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Join Date: Sep 2015
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So, with the slant pinion, you need to get slant main gear as well? Sorry if this has been adressed, I'm pretty new to larger helis.
I ask because I am about to build 2 new 450's (one 450L 6S and a regular 3S 450). |
10-23-2015, 04:22 PM | #16 (permalink) |
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Join Date: May 2012
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Yes you need the slant pinion if you have a slant main gear. The 450L Kit should have a slant gear. The regular may or may not depending on what version kit you bought.
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11-07-2015, 09:08 PM | #17 (permalink) |
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Join Date: Apr 2015
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The slanted or helical cut gear gives you more tooth contact. Taking the same thickness gear and giving you up to 10 to 20 percent more tooth contact equals stronger mesh.
The old Road ranger truck transmissions were straight cut gear. In the late seventies they came out with the helical cut gears to take the higher torque from the ever increasing horse power diesels. As a side note, the straight cut transmissions were quieter than the helical cut gear trannys. Old truck mechanic. Pete
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