FUNCTIONAL THRUST REVERSER - TRENT 900

I’ve given it a lot of effort. Problem is it requires 50mm stroke which is a lot for anything but the largest servo. A large servo won’t fit. Even one of the smallest micro servos would be difficult to merge into the design without detracting a great deal from the appearance. I’ve thought about deg my own actuator but so far nothing feasible. I haven’t given up though.

Hm, I see your point. What if you use some electrical linear actuators then?

I’ve looked at nearly everything available including linear actuators. Anything with 50mm stroke is just too big.

Ok, one last idea - I haven't printed/assembled these yet, but could you maybe fit something in the pylon that could actuate the thrust reversers? That would probably be too big of a re-design though.

I’ve considered that too.mount a linear actuator in the pylon then use a series of flexible pushrods to move the cowls. It’s possible but the only reason I haven’t done it is it becomes difficult for the average modeler to install and adjust the pushrods. It could get quite complicated.

Yes, touche. Well, if you do make something like that, I would be more than happy to purchase the model. I think what I want to do is put a battery and some electronics in the base/stand (along with a dial to control the speed), and have it connect to the jet engine through some magnetic connections (so I can still easily take it off the stand). This will let me get a stronger motor in there that would allow for a slightly higher speed. So given that the battery would be in the base, I could use that for any actuators needed for the thrust reversers as well.

Thanks for your replies!

The top and bottom thickness isn’t really critical. But I would follow my guidelines on wall thickness for sure.

RTWILEYRC
The key to printing these parts is the s.
I used Cura. I'm sure other slicers have similar settings.

Keep the speed down. I used a nominal speed of 60 mm/s. More importantly I used an acceleration of 200 mm/s^2.
I used a layer height of 0.15 mm
Use a overhang angle no greater than 27 degrees.
Enable brim: yes
brim width: 8.0 mm
top distance: 0.2 mm
X/Y distance: 0.15 mm
distance priority: XY overrides Z
distance: 2.0 mm
horizontal expansion 0.5 mm
Enable roof: Yes
roof thickness: 1.5 mm
roof density 100%

I strongly suggest you do a test print of just the chevroned area. Stop, and remove the print. Test the s for adequate adhesion and to make sure you can remove them without damage. The X/Y distance is the one parameter you will have to adjust. A little change makes a big difference. The " top distance" won't have much effect since there is so little horizontal area for the s to . Repeat test prints of the chevron area until you get the s right. You don't want to commit to a 30+ hour print until you get it right.