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From: "Greg Ward" <gregw@onestopdesign.biz>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-2734351@logan.com>
Subject: Re: [FlyRotary] Re: staging
Date: Sun, 17 Feb 2008 22:31:39 -0800
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Y'know, not meaning to offend anyone, but I am trying to mate a 400 hp 20B 
to a 250 knot+ Lancair, and after hearing how successful some of these 
installations have been, I am getting a little nervous.  Are these 
firing/grounding/running problems common?  What am I missing here?  How 
about some straight answers from some people in the know?  My life depends 
on this stuff.  Although my budget isn't unlimited, I am willing to spend 
what is necessary to guarantee that at least I can get on the ground if 
something goes wrong, but what do I buy????   I could sure use some input 
from Tracy, and guys like Tom Parkes, etc. (who won't return a query), about 
what they are experiencing with this genesis of rotary installations.  I 
just want to get to 18,000 feet, cut back to 70%, and relax.  Again, if I 
offend, I apologize.
Greg Ward
650-766-1480


----- Original Message ----- 
From: "cbeazley" <cbeazley@innovista.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Monday, February 18, 2008 12:54 AM
Subject: [FlyRotary] Re: staging


> Hi Don;
> I don't have one of Tracy's EC-2's or a Renesis CAS so take this with a 
> grain of salt.
>
> A noisy CAS signal / bad ground is the bane of 2nd gen CAS with RX7's.
> A search for a 3800rpm hesitation on the RX7 will yield a lot of hits.  It 
> is grounding related.
> Are the CAS wires shielded?
> Is the shielded wire grounded to the EC-2 end only?
> Is the EC-2 grounded to the engine or battery?
> I am not sure what Tracy is using for signal conditioners- a small 
> capacitor across the
> CAS G+/- wires has helped on the Megasquirt.
> Have you scoped the signal?
>
> You won't want to hear this either, but, most fuel pumps are only good for 
> a small number of air sucking/overheat events.
> Also applies if you uncover the inlet doing hard sideslips on empty tanks 
> or whatever.  Your current pumps are one step closer to dying.
>
> Cheers
> Cary
>
> --
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