Throttle parts - Motorized by servos

[freddehboy]

Hi

I will be able to use fsuipc for my axes and buttons assagment, see: http://forum.avsim.net/topic/351903-...ated-controls/

For the physical screens (Outbound, Inbound and Engine) I will use the 2D frame of the display!

Ex: You click at the Outbound display in the Vcockpit and get up the 2D diskplay of the VC display. I will use this 2D frame for the physical screens for my owm MIP!

Do you understand?

Best Fredrik

[freddehboy]

Hi

I have decided to use the joystick cards from FDS "FDS-FC1" for trottle and my Yoke!

Since my aircraft is supported by fsuipc a need some hardware for servo or DC motor who can be programmed in fsuipc?

I know the diff... between servo and DC motor. DC motor is better than servo but how is it with the heat?

I like servo as they are simple to install and has good temp!

Phidgets has a great range of proucts but can the be interact with fsuipc?

If that is the case I have to alternative:
1
http://www.phidgets.com/products.php...duct_id=3200_0
http://www.phidgets.com/products.php?product_id=1061

2
A good DC motor choice!?

Instead to buy prosim737 or something else I, for the physical screens (Outbound, Inbound and Engine), will use the 2D frame of the display!

Ex: You click at the Outbound display in the Vcockpit and get up the 2D diskplay of the VC display. I will use this 2D frame for the physical screens for my owm MIP!

Do you understand?

Best Fredrik

[freddehboy]

Hi

Bellow is the answer I got from PMDG about to simulate the A/T:
"The SDK doesn't provide any throttle position data. However the NGX
autothrottle drives the standard FSX throttles. He can pull the throttle
position from the FSX and send it over to his physical servos.
He will need to introduce some damping into the throttle motion if he will
be doing this. The NGX AT controls the FSX throttle pretty fast, and the VC
thrust levers use a code like this to smooth their movement:
NewPosition = 0.95 * PreviousPosition + 0.05*FSXThrottlePosition
This code runs each NGX refresh cycle (18 times a second) and smoothly
drives the VC levers towards the actual FSX throttle position."

Best Fredrik

[freddehboy]

Hi

I have seen that I can use phidgets since it is supporting fsuipc like my aircraft so there is no probblem to use it together.

I have found the DC motor:
http://www.phidgets.com/products.php...duct_id=3257_0

Controll card:
http://www.phidgets.com/products.php?product_id=1065

Is this a good choice, if I can use it for fsuipc?

Best Fredrik

[fordgt40]

Are you sure that this motor has enough torque to move the levers and overcome friction. I needed circa 7.5 kg/cm torque when converting my Symulatory throttle. Also, if you want realism then the throttles take around 5 secs to move from idle to "firewall". You need to calculate your gearing accordingly to keep the necessary torque within the motors speed range

I should also check that Phidgets have easily accessible user coding for you to write the necessary programme to control the motor speed (as per the PMDG example) and access FSUIPC offsets.

David

[freddehboy]

Hi

No, I took this motor as an example Bad one

Are you sure that this motor has enough torque to move the levers and overcome friction. I needed circa 7.5 kg/cm torque when converting my Symulatory throttle. Also, if you want realism then the throttles take around 5 secs to move from idle to "firewall". You need to calculate your gearing accordingly to keep the necessary torque within the motors speed range

Do you mean that I should calculate the speed according to the range the throttle will travel and that will result it the correct torque!?
I think I understand correctly, in some way?

Best Fredrik

[fordgt40]

Torque is basically the force that the motor can provide, it will vary with speed and voltage
The steps you need to complete are

Establish the likely torque needed to move your throttle levers from either idle or max. You can do this by using a spring balance to pull on the end of the lever at 90 deg to its pivot point. Take a note of the value and then multiply it by the distance from the pivot point to where you applied the spring balance. This will give you the force ie "pull x distance".

Then look for a motor that has that torque and draws no more current than the controller card can provide. The motor needs gearing to get the speed down to circa 15 revs a minute, this will also give you more torque. Then calculate the throttle arc of movement, probably 75 deg. Given that you want the throttles to cover that 75 deg of arc in around 5 secs then from that you can calculate the necessary gearing between the motor pulley and the pulley on your throttle lever. Remember you can always slow down the motor by using the controller card

For example. If the throttle movement arc was 60 deg, then that is 1/6th of a circle. If your preferred motor has a speed of say 20 rpm, then it will move the levers across their full full range in 20rpm divided by 60 secs = 3 secs per revolution which equals 3 secs divded by 1/6th which equals 0.5 secs to move the throttle levers across their full range. Clearly, this is too quick, so you will need gearing between the motor pulley and throttle lever pulley of a ration of 10:1 to get the correct speed

David

[freddehboy]

For example. If the throttle movement arc was 60 deg, then that is 1/6th of a circle. If your preferred motor has a speed of say 20 rpm, then it will move the levers across their full full range in 20rpm divided by 60 secs = 3 secs per revolution which equals 3 secs divded by 1/6th which equals 0.5 secs to move the throttle levers across their full range. Clearly, this is too quick, so you will need gearing between the motor pulley and throttle lever pulley of a ration of 10:1 to get the correct speed

David

Hi

I am trying to follow your example but have you calculate correctly?

I got 20 / 60 = 0,333 sec 0,3333 / (1/6) = 2 sec?

Anyway it should take 5 sec for the lever to travel the whole range!

If I increase the rpm I get less time in sec and that cannot be correct!

Best Fredrik

[fordgt40]

Yes

Look at the logic and what I said.

If the motor rotates at 20 rpm then that is 3 secs per revolution - 20 revs x 3 secs = 1 minute

If your throttle arc is 1/6th of a revolution then the levers will move across their full travel in 1/6th of 3 secs which is 0.5 secs

David

[freddehboy]

Hi

I am trying to use the same calculation for 15rpm:

60 / 15 is about 4 sec, the range 1/6 of 4 ~6 sec

I am understand the logical but is unsoure at the result since someone here said 15rpm = 5 sec but it could been about 15rpm!?

Best Fredrik