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Atom 6HV › 6HV lower KV motor??
04-20-2011 12:14 AM  7 years agoPost 1
Razz

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Louisville, KY

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Hello All,

I'm test flying a new 6HV and am looking to use a lower KV motor with my 12S TP 3300 65C batts, Jive 80HV. I'm looking to get my ESC throttle settings in a higher % area, I'm now running at 30% for HS at 2060, if I run a throttle setting at 50% I'm pushing 2250 + HS. I feel the sweet spot is 2150, so I would like to find a motor that will put me in that rpm area, then also run a lazy 3D at 1950 rpm. I can't go down on pinion size, already at smallest 10T.

Has anyone tried any other motors? It looks like a scorpion 4035-500 may fit, would like to try a Xera -470...not sure if they will fit the 6HV. The spacing is 25mm, 3mm bolts...the 6HV frame cutout may be too small at top.

I actually was able to get 7:00 minutes of flying in the 2200 rpm area with the Jive 80HV....but I do see a head speed drop which is significant after 5:00 min. Even if I run a lower throttle setting of 30%, HS of 2050, I still get a drop in HS after the 5:00 min. This is strange, as my Furion 6 running 10S 5000, will not show a HS drop near the end of flight...maybe it's the larger capacity batts. I guess the 6HV is not all that efficient with those low ESC settings, and that 540 KV motor.

I was expecting a governed HS on the 6HV to be more consistent after 3/4 of flight time, it acts more like a straight throttle curve ESC. Even after 7:00 minutes, my batts are 3.80V per cell, but since the HS really lowers after 5:00 min., it's not worth it to fly longer.

Can I get a lower KV motor to fit? Also not sure what KV would be best. Using a HS calculator doesn't even get my head speed correct, it shows a lot lower than what I'm actually getting.

Help!

Brian

DX8, Ballistic FSO, Gaui X5, Warp 360, Vbar

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04-20-2011 03:30 AM  7 years agoPost 2
hornet dave

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Cedar Rapids, IA USA

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If your headspeed is dropping at the 5:00 mark, your ESC is no longer governing at that point and is outputting full throttle. Which makes sense, because the stock setup w/ 10 tooth pinion is good governed up to around 2000 - 2050 rpm. If you want 2100-2200 governed, an 11 tooth pinion is pretty typical.

A lower KV motor would make things worse for you I'm afraid.

I got a fever! The only prescription is MORE 6HV

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04-20-2011 04:18 PM  7 years agoPost 3
Razz

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Louisville, KY

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OK, doesn't it seem odd that I'm only using a throttle setting of 30% on my Jive 80HV, and getting this higher headspeed.

I've been told that running a throttle setting lower than 50% on a Jive will not be effient, and it will not govern properly...I'm at 30%.

So, don't I need a lower KV motor so that I can get my ESC throttle % increased to the 50 - 80% range, while keeping the HS around 2000-2150.

Appreciate your thoughts,

Brian

DX8, Ballistic FSO, Gaui X5, Warp 360, Vbar

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04-20-2011 11:50 PM  7 years agoPost 4
hornet dave

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Cedar Rapids, IA USA

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Welcome to the interweb where there's 5 wrong answers for every correct one.

There's a few different control schemes when it comes to governors, and only with one of the schemes is there any direct correlation between the TX throttle output and the governor's throttle output. This would be Castle's "Simple Gov" and on a kontronics there is a mode where you simply set ~80% on your TX and it then runs the motor at the speed which corresponds to that 80% on your throttle.

Then there is the control scheme which I think you are using. This would be Castle's High/Low Gov or the gov mode on Hobbywing ESC's. Using this scheme, there is a chart which correlates the TX throttle position to a certain 'electrical rpm'. So, for sake of discussion, 10% throttle could correlate to 100,000 electrical rpm, 50% = 200,000 electrical rpm, 100% = 400,000 electrical rpm (hobbywing and castle actually publish these graphs if you are curious). So, using this mode, your throttle curve could very well be at 20% to get your desired headspeed, and at the same time the throttle output FROM THE GOVERNOR is up in the 90+% range which does not give the governor enough headroom for effective governing.

So, in short, I believe you have your governor modes confused. You are using a mode in which a very low throttle curve can be entirely appropriate for your application.

I got a fever! The only prescription is MORE 6HV

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04-21-2011 01:19 AM  7 years agoPost 5
Razz

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Louisville, KY

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Interesting, I asked Mrmel about my Jive. He thought there was an issue with ESC programing, so I reprogramed and will test fly tomorrow.

We'll see what happens!

Brian

DX8, Ballistic FSO, Gaui X5, Warp 360, Vbar

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04-22-2011 02:37 AM  7 years agoPost 6
Razz

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Louisville, KY

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Well I got a couple flights in today, and my Jive ESC was not in the gov mode....this is good news, the gov is working like it should now.

I'm using 70, 76, 86% throttle now for 1960, 2060, 2190 headspeeds. I may even try an 11 tooth pinion and see what that feels like.

Thanks Mrmel for the programing help with the Jive 80HV.

DX8, Ballistic FSO, Gaui X5, Warp 360, Vbar

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04-27-2011 10:55 PM  7 years agoPost 7
Razz

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Louisville, KY

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6HV with 11T pinion, Jive 80HV
I just tried an 11T pinion, and with the Jive 80HV, it's a very good match. The power delivery is just perfect and very smooth. I prefer a headspeed of 2170 at 65% throttle, and I'm able to run 2250 at 73% throttle. I'm using TP 3300 65C's, they run just slightly warm, along with motor after a 6:30 flight, my cell voltage is 3.78 after flying, 1/2 larger 3D, 1/2 tight 3D.

I'm flying the Outrage FBL head with red 80 Duro dampers. I get no shaking of airframe during spooldown, but get some inflight if headspeed is less than around 2050.

DX8, Ballistic FSO, Gaui X5, Warp 360, Vbar

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04-28-2011 12:50 AM  7 years agoPost 8
hornet dave

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Cedar Rapids, IA USA

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Glad you got it sorted out. Now go fly the snot out of it!

I got a fever! The only prescription is MORE 6HV

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