Throttle curve settings
11-30-2010, 03:48 PM
#1
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Throttle curve settings
Has anyone experimented with running any throttle curve setting other than full expo - ie half expo or linear?
It seems like having a more linear throttle would be a good thing, but it seems like full expo is the default and what most are using, so I guess I need to understand why it is preferable to have more of the throttle range crammed into less travel of the stick.
It seems like having a more linear throttle would be a good thing, but it seems like full expo is the default and what most are using, so I guess I need to understand why it is preferable to have more of the throttle range crammed into less travel of the stick.
11-30-2010, 06:51 PM
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RE: Throttle curve settings
ORIGINAL: gruntled
Has anyone experimented with running any throttle curve setting other than full expo - ie half expo or linear?
It seems like having a more linear throttle would be a good thing, but it seems like full expo is the default and what most are using, so I guess I need to understand why it is preferable to have more of the throttle range crammed into less travel of the stick.
Has anyone experimented with running any throttle curve setting other than full expo - ie half expo or linear?
It seems like having a more linear throttle would be a good thing, but it seems like full expo is the default and what most are using, so I guess I need to understand why it is preferable to have more of the throttle range crammed into less travel of the stick.
12-01-2010, 05:28 AM
#6
RE: Throttle curve settings
As I understand it the reason to run expo is to make the thrust range be more linear. In linear mode you need to have the stick over three quarters up to get half thrust. In full expo when the stick is at halfway, you get about half thrust. The reason is because of the thrust to RPM curve as shown in your manual (half RPM only gives one quarter thrust). Expo does not cram more throttle into less travel, it spreads the thrust curve out to make the effective throttle more linear.
12-01-2010, 07:05 AM
#7
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RE: Throttle curve settings
ORIGINAL: Hot Rod Todd
As I understand it the reason to run expo is to make the thrust range be more linear. In linear mode you need to have the stick over three quarters up to get half thrust. In full expo when the stick is at halfway, you get about half thrust. The reason is because of the thrust to RPM curve as shown in your manual (half RPM only gives one quarter thrust). Expo does not cram more throttle into less travel, it spreads the thrust curve out to make the effective throttle more linear.
As I understand it the reason to run expo is to make the thrust range be more linear. In linear mode you need to have the stick over three quarters up to get half thrust. In full expo when the stick is at halfway, you get about half thrust. The reason is because of the thrust to RPM curve as shown in your manual (half RPM only gives one quarter thrust). Expo does not cram more throttle into less travel, it spreads the thrust curve out to make the effective throttle more linear.
.
12-01-2010, 11:57 AM
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RE: Throttle curve settings
Half, Full or Linear Expo. . .that is the question.
Factory default setting is Full Expo. . .
Linear is suggested (my suggestion) for heavy jets and Turbo Props where the sensitivity below 1/2 stick is less of an issue. . .
Half Expo is just that. . .1/2 of the full Expo setting but less than the Linear setting.
I fly Full Expo with most all my jets (currently 3) and like it. My good friend Andy Kane uses Full Expo but adjusts the throttle curve to his liking within the 12X programs.
The three throttle curves built into the I.C.S. (ECU) were developed as a result of many, many requests from customers.
So, if flying a BVM BobCat, you would not be happy with Linear. . .due to sensitivity and the airframe weight it is pushing. I suggest you experiment and arrive at your desired setting. Remember, once running you can menu up to the "Start Info Run Radio" screen, click on Run and change expo. You can do this all during the same flight (not while in flight !) but while running.
Last, ONLY change throttle curve in your Tx AFTER you train the Tx and ECU.
Have a great Holiday. . .
Eric
Factory default setting is Full Expo. . .
Linear is suggested (my suggestion) for heavy jets and Turbo Props where the sensitivity below 1/2 stick is less of an issue. . .
Half Expo is just that. . .1/2 of the full Expo setting but less than the Linear setting.
I fly Full Expo with most all my jets (currently 3) and like it. My good friend Andy Kane uses Full Expo but adjusts the throttle curve to his liking within the 12X programs.
The three throttle curves built into the I.C.S. (ECU) were developed as a result of many, many requests from customers.
So, if flying a BVM BobCat, you would not be happy with Linear. . .due to sensitivity and the airframe weight it is pushing. I suggest you experiment and arrive at your desired setting. Remember, once running you can menu up to the "Start Info Run Radio" screen, click on Run and change expo. You can do this all during the same flight (not while in flight !) but while running.
Last, ONLY change throttle curve in your Tx AFTER you train the Tx and ECU.
Have a great Holiday. . .
Eric
12-01-2010, 12:27 PM
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RE: Throttle curve settings
ORIGINAL: gruntled
I took almost the opposite from the graph in the manual, but I am probably not interpreting it correctly. To me this says that full expo is cramming 46% of total thrust into the top 25% of stick travel.
.
ORIGINAL: Hot Rod Todd
As I understand it the reason to run expo is to make the thrust range be more linear. In linear mode you need to have the stick over three quarters up to get half thrust. In full expo when the stick is at halfway, you get about half thrust. The reason is because of the thrust to RPM curve as shown in your manual (half RPM only gives one quarter thrust). Expo does not cram more throttle into less travel, it spreads the thrust curve out to make the effective throttle more linear.
As I understand it the reason to run expo is to make the thrust range be more linear. In linear mode you need to have the stick over three quarters up to get half thrust. In full expo when the stick is at halfway, you get about half thrust. The reason is because of the thrust to RPM curve as shown in your manual (half RPM only gives one quarter thrust). Expo does not cram more throttle into less travel, it spreads the thrust curve out to make the effective throttle more linear.
.
To clarify the chart, the top yellow part is the throttle stick position, so at 25% of the stick travel you will have 6% of the thrust at full expo, 16% at half expo and 25% at linear
Hope this helps
Regards
