We doubled the pressure differential and hence the flow through
the rad by adding this cowl flap. The data report will
be along shortly. Coolant temp dropped 20 to 30 degrees
but it was a cooler day. For that reason the jury is still
out on whether the cooling is adequate yet.

The problem here is it is tough to install
adjustable cowl flaps as the bottom of the Pulsar cowl
opening is a compound curve. That means we need segmented
flapettes :) And a complicated control system in the bargain.

-----------------------------------------------------

Here is the first idea in the first two 3Ds.
Lots of little bits a pieces.
Watch like :) Yuck too much fabrication  work.


The third 3D is the easy way. You cut a rectangle out
of the bottom of the compound curved cowl, add side plates and it becomes
the flap. The hinges are trick but easy if you know how
to design them. More on the hinges later. The gap is sealed
with silcone rubber.

Paul Lamar


The Rotary Engine NewsLetter. Powered by Linux.
ACRE NL web site. http://www.rotaryeng.net
Copyright 1998-2005 All world wide rights reserved.