----- Original Message -----
Sent: Sunday, February 29, 2004 8:16
PM
Subject: [FlyRotary] Re: EDDIE variable
Intake photos
I haven't weighed it yet,Finn, its going to
be around 25 lbs due to my use of the old "boat Anchor" lower slab aluminum
manifold. However, if the results are promising, the next version will
be quite a bit lighter. More use of plastic resin to lower
weight, etc.
Ed Anderson
RV-6A N494BW Rotary Powered
Matthews, NC
----- Original Message -----
Sent: Sunday, February 29, 2004 6:24
PM
Subject: [FlyRotary] Re: EDDIE variable
Intake photos
Work of art, Ed!
You're putting the rest of us (well,
at least me) to shame.
Total weight?
Finn
Ed
Anderson wrote:
Well, folks, the unveiling is
here.
Here are the first photos of my variable
length intake manifold designed based on the EDDIE analysis. The
primary and secondary of each rotor are merged into one runner (1 3/4"
dia). These two runners are composed of 1.854 dia tube in which the
1.75" dia tubes slide. One set for each rotor. There is a
small DC 50 rpm motor (turns out this is a bit slow) that turns a jack
screw. This jack screw drives the throttle body mount and the two
1.75" dia tubes and changes the length by 4" which is a range of approx
1500 rpm. I wanted to get a 6-7" change, but this is a prototype, so
I used what I had laying around in terms of manifold parts which put the
whole setup 3-4" higher than I want. So depending on OAT the 1500 rpm range could give me the
EDDIE from 5000 - 6500 rpm.
There is a controller with limit switches at
the upper and lower extension to independently stop the motor when limits
are reached. I have a small potentiometer with a gear on its
shaft. A rack is attached to the throttle body which moves up and
down with it. The teeth of the rack turn the pot which of course
changes the voltage which is indicated on the control box by 10 Red
LEDs. There is a dual color LED which is Green when the throttle
body is extending and is Red when it is retracting.
A few photos are attached. Hope to
install it on the aircraft tomorrow and within a day or two have it
running.
Ed Anderson
RV-6A N494BW Rotary
Powered
Matthews, NC
Archive: http://lancaironline.net/lists/flyrotary/List.html