Originally Posted by
Slatye
Could someone explain to me why the augmentor tubes make a difference?
I would have thought that over-priming any hot engine would result in fuel vapour being ejected, and with a suitable wind direction that could well end up inside the cowling.
https://www.google.com.au/search?q=c...G0h21m3DQY8BM:
As can be seen from the above image, the C310H has an even larger area for a tailwind to blow back up the nacelle. Augmenters work by using the flow of exhaust gases into a much larger tube (augmenter - typically at least 2” larger diameter than the exhaust outlet) to draw additional air around the engine and through the augmenter. Especially when hot, any excess fuel vapours can be forced back into the nacelle by any tailwind, igniting by anything from a generator spark to the engine exhaust and potentially creating spherical cowlings and blowing the side inspection panels completely off.
A “normal” exhaust is closed (think blowing into a test tube) and a much smaller diameter, whereas the augmenter system is open and has much larger potential to allow vapour to flood the entire nacelle.