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Yes, the nickel coating was to aid in the tubes sliding -
that turned out OK in the end and it did help the mechanism move the tubes in
and out easily. However, after experimenting with 4 tubes (ideal) and
unable to keep them aligned and sliding without binding, I merged the primary
and secondary of each rotor into one runner (using a Webber manifold) and so
ended up with only 2 tubes moving. While this solved the mechanical
problem, it killed the DIE effect I was trying to capitalize on because the
sharp 180 deg turn at the throttle body reflected most of the pulse
energy rather than permitting it to travel around the bend and pressurize
the other rotor's intake port.
Attached is a photo of the In-flight-adjustable intake at
its extended (left photo) and retracted (right photo) positions. The small
black box on the left was the controller with a motor on the bottom of the
intake and connected to a screw rod which ran through a nut on the upper portion
and move the top part up and down. It had limit switches so I wouldn't
unintentionally run the top part off of its interface with the lower
part.
If you are going to build a system that has tubes sliding
within tubes, make certain you use 6063-T832 Drawn
Aluminum Tubing (Round) which is drawn (rather than 6061 extruded tubing) which
makes it more dimensional precise and is designed for telescoping. Here is
a source I found for it http://www.texastowers.com/aluminum.htm
So in the end, I reverted back to my original DIE
design - often times referred to as the "Dynamic Chamber" intake, although I use
no dynamic chamber in my design as it is not needed for aircraft
rpm.
I get between 6000-6200 rpm static depending on OAT
with a 74x88" prop using my current manifold which gives me between 175 - 185 HP
for take off. Since I do not fly at max power during cruise, I decided the
benefit I was aiming for using the in-flight-adjustable manifold would be of
minimum benefit. So I terminated efforts on the in-flight adjustable
manifold. Now, I adjust my intake length twice a year, once for
summer month flying and one for winter. Works well for me.
Ed.
----- Original Message -----
Sent: Friday, October 05, 2007 9:00 AM
Subject: [FlyRotary] Re: ATTENTION YOU ARE AT
RISK...
*uncomfortable
silence*
Well....Ummmmmmm....Aaaaaa....
Hmmmmmmmm....
I thought it
didnt work very well, something with the nickel coating and motor drive...
So
you got everything worked out?
Understood about the plugs up, I was
interested in how the sliding tubes are sealed and the drive
mechanism...
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