while getting back my skills in designing at RAF Gütersloh, I had a look at the CH-47 flightline of the 18Sqn stationed there.
While the real CH-47 have light hanging rotor blades, Nick Black's models come with straight rotors.
https://militaryaiworks.com/images/jdow ... t%2011.png
When some programmes were working with the scenery, I had some time to try to adjust the appearance of the rotors:

That looks good, but all experiments with the animations seem to fail. As soon as the push back mode starts, the still rotors disappear.

But once the push back mode stops, the animations appear correctly again with moving rotors after engine start:

So I need a little help to simply extend the part with the still rotors until the engine start...hopefully simple.
I can attach the mdl files if interested.