Hi Sylvain
Currently you are trying to understand the issue in the post: This, I think shows great maturity in an engineering sense. I will try to helpl you undrstand.
We have been discussing:
“Clutch_maximum_torque_down misnamed and not working”
But, there is also this post, which is the same issue from a different perspective:
The following is a post on the "Sprag clutch for Helicopters "
Currently, helicopter developers are hindered seriously by the lack of a ‘Sprag clutch’.
Current ‘workarounds’ are unsatisfactory.
What is a "sprag clutch’.
A sprag clutch is a one-way It resembles a roller bearing but, instead of cylindrical rollers, non-revolving asymmetric figure-eight shaped sprags or other elements allowing single direction rotation, are used. When the unit rotates in one direction the rollers slip or free-wheel, but when a torque is applied in the opposite direction, the sprags tilt slightly, producing a wedging action and binding because of friction.
Helicopters
A sprag clutch is used in many designs to transfer power from the engine to the main rotor. In the event of an engine failure, the sprag clutch allows the main rotor to continue rotating faster than the engine so that the helicopter can enter autorotation.
Wikipedia.
In a nutshell.
The engine can power the rotor.
The rotor cannot power the engine.
In the event of an engine or gearbox seizure, the rotor doesn’t seize up as well.
After starting the engine, it is a ‘checklist item’ that is NO-GO if it doesn’t function. Functionality is checked by looking for a needle split, when the throttle is rolled off from 100% towards idle.
Solution for Asobo.
parameter
sprag_clutch =
description
When this parameter is set to 1 (TRUE) engine torque drives the rotor. The rotor cannot drive the engine.
Default value is 0 (FALSE).
parameter
sprag_clutch_direction =
description
A value of 0 (FALSE) here will maintain the default rotational direction of the helicopter blades, which is clockwise (when viewed from above). Setting this to 1 (TRUE) will reverse that rotation, so anti-clockwise.
Default value is 0…
Please take the time to click the ‘VOTE’ button and show interest in heli sim developement towards realism.
Stu
Please note that this is the same problem explained 2 ways.
The first way is the current parameters should emulate a ‘sprag clutch’. using maximum torque up/down.
The second post is about a sprag clutch
Adding a working sprag clutch is one solution.
Fixing the current clutch torque up/down sdk is another.
Rgards
Stuart