Joseph M Berki wrote:

 I am concerned with the change in area do to the addition of the snorkel
 section.  The change occurs on the sides and bottom.  When I glass the
 inside I am thinking about placing foam wedges at those locations to
 provide an even taper to the restriction. The restriction is the

original

 opening.  The snorkel was added to get some clean air away from the
 fuselage bottom and any interaction from the main gear. These ramps will
 make the inside of the scoop like a funnel with no bumps or curves to

the

 wedge area just in front of the rad and oil cooler. Thanks

 Joe Berki
 Limo EZ

I am not following you here Joe. Got a sketch? There should be no

restriction

or change in internal duct cross sectional area  until you get to the

wedged shaped diffuser

above or below the rad in your case.


Paul Lamar

Paul,

Can I ask Joe a dumb question here? I'm working on a variant of a Cozy, as
Joe is, and was wondering if Joe has considered whether the change in the
airflow from the speed brake (just a belly board inserted into the airflow
midway down the fuselage bottom) is going to upset the cooling he's working
so hard to ensure. Does anyone have any data on that for running those P-51
style scoops under canard pushers?

I realize that the power is typically down when the landing/speed brake is
extended but had some concern that overheating the engine on final would be
bad thing to do and would limit options for fixing problems with an
approach.

Barry Gardner
Wheaton, IL

They usually cool too much on approach.

Paul Lamar

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Paul, While the landing brake very nearly blocks airflow to either air intake for the EZ canards, it's take off with the brake
inadvertently deployed that is the danger. According to the literature available, more than one engine has been fried by this.
Easiest way to avoid is make the brake actuated by a linear actuator switched by a DPDT switch with one momentary and one
latching pole. Position the switch so that full throttle will force the switch into the latched, landing brake up position.
Using the momentary pole for brake down gives some variability to the brake position. That way you can partially deploy the
brake to block FOD from getting thrown into the intake by the nose wheel at the start of the take off roll.

Rick Girard

What can I say other than aviation is a self cleaning oven :)

Paul Lamar
 
The AirCraft Rotary Engine NewsLetter.  Powered by Linux.
ACRE NL web site. http://home.earthlink.net/~rotaryeng/            
Copyright 1998-2003 All world wide rights reserved.