In reply to Frank4short:
Spinward Fringe by Randolf L** something. It's like a book boxed set, found them online, loved the tech but like some of the good series on TV I found them quite challenging in that the main characters don't always get their way and sometimes die.
In fact here you go, free on kindle:
https://www.amazon.co.uk/Spinward-Fringe-Broadcast-0-Origins-ebook/dp/B004E...
Also the phoenix conspiracy another online one that may have been free for the first copy, not a bad read.
My favourites have been by E. R Mason and ex nasa engineer and test pilot, may not be to your taste but, adventure in space with happy endings, (not like the first suggestion). He has the experience and can write so it rings true but you may find it lacks some of the grit of the above but easier reading.
Also free on Kindle
https://www.amazon.co.uk/Fatal-Boarding-E-R-Mason-ebook/dp/B00LMKHT5Q
Finally this, the bastard child of sci-fi and mills and boon, not a bad story but every time the love interests meet it descends into a couple of pages of "his hard body pressed against her and he kissed her so hard her socks flew off". It made me smile and cringe equally, the guy who wrote it is either 15 or lives with his Mum but the theme of the story is entertaining.
https://www.amazon.co.uk/Last-Praetorian-Redemption-Trilogy-Book-ebook/dp/B...
Also free to kindle.
Enjoy
Toby