What,s a good RPM to launch a 4 speed?

What most have said rings true.
I wouldnt just straight dump the clutch.
Id load it up to point you can feel it about to creep then come
off it if that makes sense. You dont wanna shock the drivetrain,
you want to load it up.
Manuals break running gear more due to shocking it an automatics
less due to loading it up instead.

An id recommend dialing it to the rpm where max torque is.
Not power. But thats me.
You cant really say a given rpm,due to different engines
setups etc having different powerbands.
With stick shift,its all trial an error my freind as i learnt.

Best of luck!
Hope that all made sense!