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Message-ID: <42B5B684.7060000@bellsouth.net>
Date: Sun, 19 Jun 2005 13:16:36 -0500
From: Charlie England <ceengland@bellsouth.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Making progress on Chris n Dave's Velocity Engine (throttle return
 action)
References: <list-1006750@logan.com>
In-Reply-To: <list-1006750@logan.com>
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David Staten wrote:

<snipped>

> operating spectrum and can result in higher minimum idle speeds. 
> Another plus that I re-discovered today was that there are essentially 
> TWO separate methods to actuate the throttle. I am presuming one is 
> for the stock "cruise control" feature and the other for the 
> traditional foot pedal. While I dont envision running two throttle 
> cables, the ability exists. Given that if a throttle cable fails, the 
> failure mode is for the throttle to close, a second throttle can be 
> used to hold open the throttle if need be. Again, this may be 
> overkill, but the ability to do so is built in to the TB. The other 
> nice thing is, the contraption is
>
> Dave Staten
>
<snipped>

Dave,

Most a/c applications use reversed 'logic' on throttle return. They are 
set up spring loaded to open 75% or more if a cable breaks. You can 
always reduce power with mixture or ignition switches,  but you can't 
add power if the cable fails & the throttle snaps shut. Most guys doing 
auto conversions find a way to reverse the action of the return spring.

FWIW,

Charlie