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From: "Mike Wills" <rv-4mike@cox.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] Re: FLIGHT DATA 1
Date: Mon, 29 Mar 2010 19:29:30 -0700
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I used a couple of short lengths (maybe 2"?) of sched 40 PVC pipe, pipe 
caps, and brass tubing for the hose connections. I'm not sure that the 
packing Don used is necessary - the goal is to add some volume to get some 
damping. A more elegant way would be to electrically filter/damp the MAP 
sensor outputs, but this is cheap, easy, and works.

Mike Wills

--------------------------------------------------
From: "Bill Bradburry" <bbradburry@bellsouth.net>
Sent: Monday, March 29, 2010 9:50 AM
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: [FlyRotary] Re: FLIGHT DATA 1

> Don,
> Thanks for the quick reply.  One and a half tenths you say.  I suppose it
> should be rock steady especially with the engine off.  I will have to 
> check
> that.  It appears that we could all benefit from trying to remove the 
> pulses
> from the MP line.  I will visit Home Depot.
>
> Bill B
>
> -----Original Message-----
> From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
> Behalf Of Don Walker
> Sent: Monday, March 29, 2010 12:36 PM
> To: Rotary motors in aircraft
> Subject: [FlyRotary] FLIGHT DATA 1
>
> I have no idea how to compute power at different altitudes and my WAG is
> that different props and engines would make any comparison inexact at 
> best.
> Ed probably would know best.
> The best way that I know of to determine if you need this is to look at 
> your
> MP on the EM-2 at a steady RPM and see if it varies.  Mine varied plus or
> minus 1 and a half tenths.  If it varies with the engine OFF, you have a
> EC-map sensor problem.
> I went to Home Depot and got a Zoom oiler  from the Swamp cooler 
> department
> or where they sell oil for those of you who are lucky enough to live in 
> hot
> humid places. Probably next to the WD-40.  It has a small  plastic cap and 
> a
> spout that pulls out Several inches.  I cut it off and inserted about 2
> inches of it into the vacuum line going to the map sensor on the EC-2 then
> locked it in place using several nylon wire
> ties. It's about 1/16th inch ID, I never measured it.   Greatly improved
> things, on the display and I got more RPMs.  Then I made 2 accumulators
> using 2 inches of 1/2 ID tubing, rolled up green scubby pad tightly and
> inserted it into the tubing.  Went to the hardware store and got  4, 1/8th
> inch barbed  fittings (brass) x 1/4 MPT and inserted it into both sides of
> the tubing, hose clamp it tight and inserted it into the vacuum line. 
> Don't
> remember if before or after the restriction.  Even better now.  Works 
> great!
> Try it! Experiment!  I love these cheap, quick hardware store fixes!
>
> Don Walker
> Flying N113BR
>
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