Engine Ejectors

[louross]

Can you explain the engine ejectors- what they do and etc?
Thanks in advance.
louross

[alex94]

aviation.stackexchange.com/questions/37332/what-is-this-ring-shaped-device-behind-this-dc-8s-jet-engine/37333?utm_medium=organic&utm_source=google_rich_qa&utm_campaign=google_rich_qa#37333

[aerofoto - HJG Admin]

Can you explain the engine ejectors- what they do and etc?

This subject come up quite a lot

Typically referred to as "EJECTORS" .... but also .... sometimes referred to as "T-RINGS" or "TRANSLATION RINGS"

These apply to DC-8-11/12 through DC-8-43 series aircraft only .... but ....not to DC-8 SHIP ONE 1958 though (in its earliest configuration) or any of the later series DC-8's.

"TECHNICALLY SPEAKING" .... they had 2 functions ....


(1) To assist with noise reduction during T/O and landing .... although the extent of any noise reduction these facilitated has always been "debatable" despite what DOUGLAS promoted at the time..

(2) The inner part of the Ring/s also housed a pair of clam-shell type doors that rotated inwards/sideweays to redirect engine thrust forwards and sideways after the Ejectors/Translation Rings were extended ....when reverse was pulled on after landing.


The EJECTORS/T-RING were deployed for both T/O and landing only .... and used below 10,000 FT and within the maximum airspeed range for flap and landing gear deployment according to my R/W manuals..

With our DC-8-11/12 through -43 simulations these are simulated .... but .... they're just an animation only (engaged using the O/H sub panel switches on each of the respective DC-8-10 through -40 aircraft type panels .... or .... using keyboard commands "SHIFT + W") .... but .... they don't interact with sound/our soundpacks at all.

Mark C
AKL/NZ

[louross]

Thanks for that info! Sorry about the long delay in my response, but internet problems.
LR.