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HelicopterFlybarless Rotor Head SystemsFutaba CGY › Futaba 750 setup help on Scale / AP helicopter
12-03-2011 10:41 PM  5 years agoPost 1
tabbytabb

rrElite Veteran

seattle

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For your futaba 750 experts out there I could use a little help in optimizing my setup. I am putting a 750 on a AP ship that formerly had a Vbar on it. It was flying great with the Vbar and some very minor tweaks. I am having a hard time getting the same level of performance out of the 750. I am sure it is just my lack of familiarity with the system as I have a 750 flying great on a normal helicopter.

The main thing I am having an issue with is nodding in the elevator axis. Right now the helicopter flies great with no nodding when in rate mode. Switch to AVCS and I get a bit of nodding (very slow frequency bounce / bobble on elevator axis) I am assuming due to the very high inertia on elevator axis I need to customize my setup a bit.

Right now my setup is:

Futaba BLS252
Ele gain 100%
Ail Gain 90%
flight mode 4
DLY in 0
Stock AVCS dmp
Head response 2

any tips would be much appreciated! Photo of heli attached

Thanks!

Tabb

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12-04-2011 04:28 PM  5 years agoPost 2
Yeehaanow

rrApprentice

Vermont

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What happens when you turn the elev gain down?

-Tim

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12-04-2011 05:19 PM  5 years agoPost 3
cdrking

rrElite Veteran

Seattle

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Tabb,

My son says your heli looks like a machine gun. Hope you are well.

DrBen is the 750 guru for sure.

Jeff

To hover is divine, the alternative is rather PLANE.

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12-04-2011 05:20 PM  5 years agoPost 4
tabbytabb

rrElite Veteran

seattle

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Hey Tim,

I made some progress yesterday. It just needed the I gain brought down a bit. I could cure the problem by bringing down the overall gain as well but then it would start to feel a bit loose on the elevator.

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12-04-2011 05:20 PM  5 years agoPost 5
modtron

rrKey Veteran

Oxford. UK

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On my scale machines I have mine set to flight mode 2 or 3 using either 2 or 3 blade, 2.5 mtr heads.

My elevator gain is around 80% - 85%.

Even with these values, I have expo dialed in from the transmitter and the values in the 750 expert menu set to zero.

Could be that mode 4 is to high for a scale type flying set-up ?

modtron
Oxford UK

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12-04-2011 05:22 PM  5 years agoPost 6
tabbytabb

rrElite Veteran

seattle

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Hey Jeff! Yeah the big carbon tubes on that machine are pretty hilarious looking! Makes it easy to balance the machine though when you show up for a job and they want to use a 4lb lens instead of the 1 lb one I like to fly with

Hope you are doing well also!

Hopefully Dr.Ben will chime in at some point. I have been reading his posts and getting lots of useful tips along the way!

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12-04-2011 05:24 PM  5 years agoPost 7
tabbytabb

rrElite Veteran

seattle

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Modtron - good point! I will give the lower settings a try. I started at 4 because people reported it felt more 'precise' which is what I am after.

Any vids of you 2.5mtr flying? Would love to see them!

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12-04-2011 05:25 PM  5 years agoPost 8
modtron

rrKey Veteran

Oxford. UK

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No vids as yet, but we are working on it.

Weather here is tooooooo cold at the moment !

modtron
Oxford UK

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12-04-2011 10:28 PM  5 years agoPost 9
Dr.Ben

rrMaster

Richmond, VA, USA

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Which firmware version is in the camera ship?

Ben Minor

Team Synergy Team Futaba Team Kontronik USA
Progressive RC

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12-04-2011 11:11 PM  5 years agoPost 10
tabbytabb

rrElite Veteran

seattle

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Hey Ben,

This is a brand new 750, so I think it has 4.2. Let me check.

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12-05-2011 04:59 AM  5 years agoPost 11
tabbytabb

rrElite Veteran

seattle

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Beginning to think there might be more to the difficulty I have been having, I just went to power up the unit and got a "SENSOR ER" indication.

Looks like this one is headed back to Futaba.

Anyone else had a SENSOR ER on a 750? I did a search and could not find many instances.

Tabb

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12-05-2011 05:31 AM  5 years agoPost 12
Dr.Ben

rrMaster

Richmond, VA, USA

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Fortunately, it's an uncommon occurrence. Hobby Services will take care of it for you.

Ben Minor

Team Synergy Team Futaba Team Kontronik USA
Progressive RC

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12-05-2011 07:38 PM  5 years agoPost 13
hgh001

rrApprentice

South Africa

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The 3 axis gyro is not functional. Send it back as a warranty claim.

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12-05-2011 08:50 PM  5 years agoPost 14
tabbytabb

rrElite Veteran

seattle

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Headed back for replacement.

Can anyone confirm which sensor is in a 750? Are they using silicon sensing pinpoint gyros like the 701?

Thanks

Tabb

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12-05-2011 09:39 PM  5 years agoPost 15
Phaedrus

rrKey Veteran

S. Orange County,​California

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Just a reminder, the sensor and box are a matched set calibrated for use with each other. Send them both in.

AMA Leader Member
Go FASST, or Go Home!!
Team Futaba

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