KR> Wide Open Throttle (WOT) Spring

2015-06-18 Thread Tinyauto at aol.com
Grumman Tr2s have a WOT spring on them and thank goodness they do.   Years 
ago, shortly after coming out of an annual inspection that included  a carb 
rebuild the throttle push/pull came unhooked due to the nut falling  off of 
the swivel.  The throttle went wide open and allowed me to go to my  home 
airport.  Once I knew the field was made, I pulled mixture and  landed.  If it 
didn't have a spring on it, I would have had to land  somewhere in the 
weeds.  I never took my airplane back to that  mechanic.

The Throttle on 2 strokes almost exclusively have the throttle slide to go  
closed if the throttle breaks.  I don't like that, but that is the way it  
is by design.  

Maybe install a lighter spring as it shouldn't take much at all to bias to  
WOT.  The one on the Marvel Schebler carb is a big round spring surrounding 
 the throttle shaft and twists to open.

Kevin Golden
Harrisonville, MO




In a message dated 6/18/2015 6:57:00 P.M. Central Daylight Time,  
krnet at list.krnet.org writes:

I have a  Zenith carburetor on my 2180 VW.  I installed a WOT spring on the 

throttle plate shaft that would open the throttle in  case the the  
throttle 
control linkage disconnected for whatever reason.  The logic  is to have 
the 
engine run full RPM rather than idle for a forced landing  with no throttle 
control.  Engine operation could be managed by  switching the ignition on 
and 
off.  Backfires something terrible when  I do that.
Question:  How often do throttle linkages break?
What  prompts the question is: The WOT spring on my carb is holding the 
throttle  plate a little open so that I cannot get down to 800 RPM idle.  I 

disconnected the spring and everything works OK.

Sid  Wood
Tri-gear KR-2 N6242
Mechanicsville, MD,  USA





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KR> Wide Open Throttle (WOT) Spring

2015-06-18 Thread Sid Wood
I have a Zenith carburetor on my 2180 VW.  I installed a WOT spring on the 
throttle plate shaft that would open the throttle in  case the the throttle 
control linkage disconnected for whatever reason.  The logic is to have the 
engine run full RPM rather than idle for a forced landing with no throttle 
control.  Engine operation could be managed by switching the ignition on and 
off.  Backfires something terrible when I do that.
Question:  How often do throttle linkages break?
What prompts the question is: The WOT spring on my carb is holding the 
throttle plate a little open so that I cannot get down to 800 RPM idle.  I 
disconnected the spring and everything works OK.

Sid Wood
Tri-gear KR-2 N6242
Mechanicsville, MD, USA







KR> Wide Open Throttle (WOT) Spring

2015-06-18 Thread brian.kraut at eamanufacturing.com
My theory is that no certified plane I know of has a spring to open the
throttle, so I don't need one on my experimental either.  If I did put
on a spring it would be a weak one and connect to the throttle linkage
arm.  I also believe in good aircraft type of throttle controls with no
play in the system so the throttle stays where I put it.


 Original Message 
Subject: KR> Wide Open Throttle (WOT) Spring
From: Sid Wood via KRnet 
List-Post: krnet@list.krnet.org
Date: Thu, June 18, 2015 4:56 pm
To: 
Cc: Sid Wood 

I have a Zenith carburetor on my 2180 VW. I installed a WOT spring on
the 
throttle plate shaft that would open the throttle in case the the
throttle 
control linkage disconnected for whatever reason. The logic is to have
the 
engine run full RPM rather than idle for a forced landing with no
throttle 
control. Engine operation could be managed by switching the ignition on
and 
off. Backfires something terrible when I do that.
Question: How often do throttle linkages break?
What prompts the question is: The WOT spring on my carb is holding the 
throttle plate a little open so that I cannot get down to 800 RPM idle.
I 
disconnected the spring and everything works OK.

Sid Wood
Tri-gear KR-2 N6242
Mechanicsville, MD, USA





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