Earlier, (B2431) wrote:

Can anyone provide a site or advice on placement a details of construction and
design of spoilers?

What I'd recommend:

Go visit a gliderport and look at the spoilers and airbrakes fitted to
various gliders.

If you like the look of the hinged panels fitted to Schweizer gliders
(except SGS 1-35, which uses flaps), just copy what you see there.
There's not much to the system that you can't see; and the loads ought
to be pretty easy to reverse-engineer from the sizes of the panels,
fittings, hinges, metal guages, and performance numbers.

If you like the look of the airbrakes fitted to most european
composite sailplanes, your best bet is either find a broken-open
example or to look up the manufacturer's service bulletins on the Web.
For example, see the airbrake work instructions on the bottom of this
page:

http://www.solairecanada.com/technotes.htm

I'm not an engineer, aero or otherwise, so I adopted a pretty
simplistic approach to sizing the components of the airbrakes on my
project. What I did was to start with the assumptions that my glider
would glide at about ~10:1 at Vne, and that the airbrakes would
conform to JAR-22 for aerobatics and keep the speed at or below Vne in
a 45-degree dive.

Since I know the weight of the aircraft and its glide angle in both
conditions, it's a simple sine function to find the total drag in each
condition. The drag difference between the two conditions must be due
to the airbrakes. So I size the airbrake mechanicals to support the
resulting drag, plus about 50% for safety margin.

That might not be the best way to approach the problem, but when I
work through the numbers, I end up with mechanical components of about
the same size and arrangement as I see on the European racers.

Thanks, and best regards to all

Bob K.
http://www.hpaircraft.com