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Old 10-30-2020, 08:59 AM   #1 (permalink)
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120 degree CCPM heli...
Geometry is as perfect as I'm worried about getting it... In other words, with servo arms at a perfect 90 (lego method baby!), swash is perfectly level and blades are a 0 degree pitch... full collective range is 27 degrees and I've got 13.3+ and 13.7- so my swash is as near center at 0 as I want to bother getting it...

So the FC6250HX wants a 0 to 100 pitch range on the transmitter... but I'm assuming it's still ok to tweak the travel?

In other words, after setting the AFR in forward programming, let's say I have 12 degrees positive and 12.4 degrees negative... I'm assuming it's not going to screw with the 6250 if I change the travel in the radio to get a perfect +/-12 degrees? I realize that as close as it is now I'd never feel the difference, but I'm a perfectionist...
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Old 10-30-2020, 04:48 PM   #2 (permalink)
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I've done this exactly, set the AFR pitch and then used pitch travel to fine tune both positive and negative pitch travel end points.
Everything has been working perfectly.
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Old 10-30-2020, 05:16 PM   #3 (permalink)
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v5.5 added setup->swashplate->afr->differential, adjust towards the direction you need more collective. In your case increase until you see +12.4 degrees. This just helps to keep the settings in the fc6250hx.

Tx epa's can be used for <=v5.4, center being 0 is very important epa's not so much.

Regards,
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Old 10-30-2020, 06:13 PM   #4 (permalink)
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That's a great tip, thanks Brian.

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Old 10-31-2020, 11:19 AM   #5 (permalink)
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So my 6250hx is on 5.5, i checked play store and ensured i am on the latest airware and i donít seem to have the differential option in the AFR menu?

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Old 11-02-2020, 12:43 PM   #6 (permalink)
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Actually, I added this to v5.5 for testing right after the 1st beta release.

I will post a v5.5 open stock beta 2 later this week that contains the parameter.

I do recommend double checking your setup before using this tweak as it is not needed very often in my experience over the last 5 months of testing. Always triple check the 0 position at center stick as digital pitch gauges do drift over time.

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Old 11-04-2020, 06:59 AM   #7 (permalink)
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With this afr setting, do you measure on the positive side or the negative side or doesnít it matter?

Also what about blade orientation, ie is roll measured over boom? Iím really use to vbar and measuring over the boom but that does not mean the same applies here.
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Old 11-04-2020, 11:50 PM   #8 (permalink)
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Quote:
Originally Posted by Simo71 View Post
With this afr setting, do you measure on the positive side or the negative side or doesnít it matter?

Also what about blade orientation, ie is roll measured over boom? Iím really use to vbar and measuring over the boom but that does not mean the same applies here.



For the AFR collective I did positive. Not sure if it matters but just following the "Tom video". Roll parallel to the boom and pitch perpendicular to the boom.



Part 4 - Swashplate Setup - Spektrum 6250HX Flybarless Controller Setup Series (10 min 14 sec)
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Old 11-05-2020, 01:29 AM   #9 (permalink)
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For the AFR collective I did positive. Not sure if it matters but just following the "Tom video". Roll parallel to the boom and pitch perpendicular to the boom.



https://www.youtube.com/watch?v=VJ0m2S42QPI
Yes, except the step for AFR seemed a bit vague. For roll he seemed to use negative and positive for pitch.

Iím getting a bit of drift in pirouettes, but it was a bit breezy.
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Old 11-05-2020, 08:10 AM   #10 (permalink)
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Quote:
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Yes, except the step for AFR seemed a bit vague. For roll he seemed to use negative and positive for pitch.

Iím getting a bit of drift in pirouettes, but it was a bit breezy.

What heli is this on and do you have you checked CG?
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Old 11-05-2020, 12:38 PM   #11 (permalink)
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Quote:
Originally Posted by Simo71 View Post
With this afr setting, do you measure on the positive side or the negative side or doesn’t it matter?

Also what about blade orientation, ie is roll measured over boom? I’m really use to vbar and measuring over the boom but that does not mean the same applies here.
I generally check with the blade over the boom out of convenience, does not really matter if mid stick is 0 collective and you reset the pitch gauge at the blades current location.

Always keep 100 or higher in the transmitter "PIT" AFR's so basically increase your low direction if needed.

This only applies to the collective pitch, all other transmitter AFR's must remain at 100/100.

v5.5 beta 2 with the differential setting is up on spektrumrc.com now.

Regards,
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Last edited by brianbremer; 11-06-2020 at 07:14 AM..
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Old 11-05-2020, 03:39 PM   #12 (permalink)
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What heli is this on and do you have you checked CG?
Goblin 380 Buddy, but it was fine with mini Vbar. Seems to be solid in a hover with no drift, but need to check it again with better weather.

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I generally check with the blade over the boom out of convenience, does not really matter if mid stick is 0 collective and you reset the pitch gauge at the blades current location.

Always keep 100 or higher in the transmitter "PIT" AFR's so basically increase your low direction if needed.

This only applies to the collective pitch, all other transmitter AFR's must remain at 100/100.

v5.5 beta 2 with the differential setting should be posted this afternoon along with brief notes describing how to use it. Update, this might occur next week as spektrumrc.com is currently not available.

Regards,
Ok, will look out for it.
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Old 11-06-2020, 07:17 AM   #13 (permalink)
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Beta 2 is now available on spektrumrc.com


Regards,
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Old 11-09-2020, 08:52 AM   #14 (permalink)
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Goblin 380 Buddy, but it was fine with mini Vbar. Seems to be solid in a hover with no drift, but need to check it again with better weather.

I'm setting one up on a Goblin 380 Buddy as well

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Old 11-09-2020, 08:58 AM   #15 (permalink)
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Question for Brian....
Is it not possible to add a derivative for Aileron & Elevator as well?


I ask because on almost all my helis I wind up with Aileron or Elevator 10.5 in one direction and 11.6 in the other. Always using caliper to check my link lengths and servos are always centered.
I fly with it like this anyways but it would be nice if I could nail it down.
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Old 11-09-2020, 10:39 AM   #16 (permalink)
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The fc6250hx outputs are symmetrical and any differential outputs being noted are due to the head / swashplate design, servo accuracy can impact this as well but in my experience the cause is the head / swashplate design.

In the case of collective since both blades are moving the same direction we can reduce the problem however in the case of cyclic the blades are moving opposite direction's so a similar fix would not work. Keep in mind you are only measuring one of the two blade during setup....

In the case of cyclic showing differential values all you can really do is average the variance around the recommended 12.5 degree setting. For example a left cyclic of 12.8 and a right cyclic of 12.2 is an average of 12.5 degrees.

Regards,
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Old 11-09-2020, 11:13 AM   #17 (permalink)
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Hi Brian, Thanks that makes a lot of sense regarding the cyclic moving in different directions. I'll be sure to do an average on the cyclic.

Now I just need it to warm up so I can get a maiden in!
Thanks again!
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