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HelicopterHenseleit 3DNT - Rocket - 3DMP › micro cased SL560
10-21-2004 03:45 AM  13 years agoPost 1
GBNT

rrApprentice

uk

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Hi
Going to fit a micro cased SL560 gyro on my NT & would be gratefull if there are any tips on:
1/ Best way to mount gyro to avoid vibration issues
2/ Any gyro setup changes from standard that suits the NT
3/ Which of these servos would suit the 560 best,JR NES 8700G or Futaba 9254

Would appreciate any help to get the best out of this gyro

NT Spec:OS 91 FX,Hatori 700,Swash Futaba 9206 x 3,TJ Pro /Futaba 9253,Duralite batt 1900 mah,NHP Razor Pro Blades710mm,95mm Carbon Tail blades


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10-21-2004 08:49 AM  13 years agoPost 2
G.Man

rrProfessor

Bristol

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Mount the gyro at the rear with the stock pad and use the 8700G servo (its not as fast but gives a nicer feel and allows higher gain than the 9254)

The gyro setup is on RCmodels distribution website for the 3DNT as used by Russ Deakin on his 3dnt

Don't Email me as I wont reply - PM Only (spam countermeasures)

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10-21-2004 10:17 AM  13 years agoPost 3
NT2

rrApprentice

West Sussex UK

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I second the 8700 on the 560 - tried the faster ones and for some reason the superservo is nicer!

Whilst I am on it - the 8700 is a super servo, not a digital, yet is very expensive (worth it it seems as its my tail servo of choice) - what is the diffrence between a super and digital?

Nick t

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10-21-2004 01:01 PM  13 years agoPost 4
GBNT

rrApprentice

uk

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.
Whilst I am on it - the 8700 is a super servo, not a digital, yet is very expensive (worth it it seems as its my tail servo of choice) - what is the diffrence between a super and digital?
Super Servos
The term super servo is used to describe servos capable of running at high data frame rates (6ms per frame or less). Examples of this type of servo are the JR2700G and Futaba-S9250

To start with, a ‘digital servo’ is the same as a standard servo, except for a
microprocessor, which analyses the incoming receiver signals and controls
the motor. It is incorrect to believe that digital servos differ drastically in
physical design to standard ones. Digital servos have the same motors,
gears and cases as standard servos and they also, most importantly, have a
Feedback Potentiometer (Pot) just like their standard counterparts.
Where a digital servo differs, is in the way it processes the incoming receiver
information, and in turn controls the initial power to the servomotor, reducing
the deadband, increasing the resolution and generating tremendous holding
power.
In a conventional servo at idle, no power is being sent to the servomotor.
When a signal is then received for the servo to move, or pressure is applied
to the output arm, the servo responds by sending power/voltage to the
servomotor. This power, which is in fact the maximum voltage, is pulsed or
switched On/Off at a fixed rate of 50 cycles per second, creating small ‘blips’
of power. By increasing the length of each pulse/blip of power, a speed
controller effect is created, until full power/voltage is applied to the motor,
accelerating the servo arm towards its new position.
In turn, as the servo positioning pot tells the servo’s electronics it is reaching
its required position, the power blips are reduced in length to slow it down,
until no power is supplied and the servomotor stops.

More info on digital servos Here

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10-21-2004 03:27 PM  13 years agoPost 5
Nick T

rrApprentice

West Sussex, UK

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Thank you GBNT. Got the idea for digital and std now, but super - is this better than digital, seems different.

All I know is that my digis are more precise, need bigger battery packs and the super, well its super it seems and capable of recieving fast frame rates - any pot in the super and do they all have a pots?

Just spoke to Revo models - no news on the UK relase of the 3DMP, seems they may email his shortly and ask for an update. Not that the weather here (major winds and rain where I am) would allow any flying anyway.

Nick T

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10-21-2004 04:06 PM  13 years agoPost 6
BigChopper

rrKey Veteran

Cambridge, UK

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560 and 8700g

The 560micro & 8700g on my NT works very well indeed.. Worth going in with you PC for a quick tweak!

Mount it at the back, get some brass plate.. use standard CSM strip tape to mount the brass to the top of the boom clamps, then use thin double sided pad to mount the 560micro to the brass. This helps keep the gyro CofG down low.

Put these settings into it and work from here...

Look at this thread

It works!

Andy

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10-21-2004 05:38 PM  13 years agoPost 7
GBNT

rrApprentice

uk

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All I know is that my digis are more precise, need bigger battery packs and the super, well its super it seems and capable of recieving fast frame rates - any pot in the super and do they all have a pots?
Digital servos have the same motors,gears and cases as standard servos and they also, most importantly, have a
Feedback Potentiometer (Pot) just like the standard servo's have.

I'm no expert on this and maybe the likes of Galifrey or Bigchopper can shed more light on this, as I can only assume from what I have read, that all servos have a Feedback Potentiometer (Pot) and the difference between the super & a standard servo is, I presume (Help me out if I am wrong guys)
In a conventional servo, the motor has a steel core armature wrapped in wire that spins inside the magnets.

In a coreless servo( I think that the 8700 is), the armature uses a thin wire mesh that forms a cup that spins around the outside of the magnet eliminating the heavy steel core. A coreless motor does not have magnets as standard servo motors do, so they have a smoother, more constant, and stronger action. Regular servo motors have either 3 or 5 magnets (poles) which when the armature is between these, the servo motor is at its weakest.

I think the biggest difference between super & digital is down to the microprocessor in the digital, adding super fast electronic control.

If I,m wrong on this I apolagise and hope those in the know can put me right.

Thanks Galifrey found that info

Cheers BigChopper
Could'nt find any CSM strip tape, could you point me in the right direction for some.
Will use brass plate as prescribed

Cheers Guys

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10-21-2004 06:41 PM  13 years agoPost 8
DOKEY

rrProfessor

Northamptonshire UK

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Could'nt find any CSM strip tape, could you point me in the right direction for some.
http://www.modelhelicopters.co.uk/a...p_GyroAccs.html

CSM0017 : CSM Gyro Mounting Tape (360/400/420/540/560)
CSM Gyro Mounting Tape - 360/400/420/540/560 (10)
Price: £1.69 £1.99 Including VAT at 17.5%

Ryan.

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10-21-2004 07:36 PM  13 years agoPost 9
GBNT

rrApprentice

uk

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Cheers Ryan.
Jez

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10-21-2004 08:10 PM  13 years agoPost 10
BigChopper

rrKey Veteran

Cambridge, UK

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digital servo stuff?

yer sounds about right.. who cares eh.. the heli still flies. I never really knew what 'coreless' meant. and to be honest I never really cared anyway...

I think it's fair to say that in general you can get a bit more response and precision when flying with digital servos.. but this of course depends on what you are comparing..

Also depends on your flying style! stick banging will yeild the same carnage, regardless of servo.. unless of course the servo doesn't have enough torque to handle it... in which case the stick banging will soon end the flight. If you are flying precise/smooth accurate 3D, then thats when you can tell the difference between a great servo and an average servo. Probably the same with FAI, but I dont know as I dont fly FAI

Either way it'll still hurt yer wallet when the dumb thumbs kick in.

Andy

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