Mailing List flyrotary@lancaironline.net Message #24152
From: Charlie England <ceengland@bellsouth.net>
Subject: Making progress on Chris n Dave's Velocity Engine (throttle return action)
Date: Sun, 19 Jun 2005 13:16:36 -0500
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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
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