Flybynight47

My Feedback: (11)

I've seen the term "preload" in several threads concerning turbines. What does that mean, please?? Still learning. BTW, is there a book that tells all about turbines, ie, how they work and how the ecu works, start up, etc....what to do and what not to do. Or is all that type info gained from just experience. Thanks, Tom in Ga.

Dave03B

Hi, I am in the same boat (newbie to turbine)

I was recommended to get the following two books to familiarise myself with the do's and dont's, and how turbines work.

Will be ordering them soon

[link=https://www.traplet.com/pages/store/action.lasso?-token.cust=12860336&-database=Products.fp3&-layout=CGI&-response=/pages/store/detail.html&id=116&-search]Mike's Jet book[/link]
[link=https://www.traplet.com/pages/store/action.lasso?-token.cust=12860336&-database=Products.fp3&-layout=CGI&-response=/pages/store/detail.html&id=2081&-search]Radio Controlled Model Jet Guide[/link]

ajcoholic

My Feedback: (10)

The full compliment, cageless bearings in the turbines today have tapered races, and are required to have some axial force (in the direction that tends to keep the bearing races together) for them to operate properaly at the speeds the engines run at. The "preload" is a spring or springs that act on the bearings to give this force.

I may not be the best at clearly explaining this, but think of it as a spring acting on the outer races of the bearings, that keep the bearings races properly positioned and prevent them from coming apart.

Much information is available by joining the Gas Turbine Builders Association, and also buy Thomas Kamps' 2nd edition of his book on building model turbines, available through Traplet Publishing

AJC

ajcoholic

My Feedback: (10)

Dave, Mikes Jet Book is 99% ducted fan JFYI and Kamps covers turbine jets exclusively. The book I meant to get is:

https://www.traplet.com/pages/store/...d=3581&-search

Dave03B

thanks for pointing that out. I really want to stay clear of DF now, as they do seem to be fiddly, and tempremental (or is it just my luck)