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  #1  
Old 03-03-2021, 02:02 PM
rileyspoon rileyspoon is offline
 
Join Date: Oct 2020
Location: WINSTON SALEM
Posts: 20
Default Run engine w/o wings

Seems like I saw a thread where it was being discussed if it were advisable to run the 912iS without the wings attached? Can't seem to find it now though.
Anyone remember such a discussion? I've seen a video of someone testing their engine on an RV-12 build and the wings were not attached.

Thoughts?
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  #2  
Old 03-03-2021, 02:53 PM
PhatRV PhatRV is offline
 
Join Date: Mar 2018
Location: Buena Park, California
Posts: 436
Default

I read early on that the RV12 has a safety switch to prevent the starting of the engine unless both of the wings are installed onto the fuselage.
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  #3  
Old 03-03-2021, 03:12 PM
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DaleB DaleB is offline
 
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Location: Omaha, NE (KMLE)
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Yes, and there's also a big red lighted button to override it, if you must.
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  #4  
Old 03-03-2021, 03:30 PM
SuperDave SuperDave is offline
 
Join Date: Feb 2011
Location: Brandon, FL
Posts: 69
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Yeah, I remember reading somewhere that they started installing those switches after somebody forgot to put their wings on and went off the end of the runway at over 100 mph.
I read it on the internet so it must be true...
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  #5  
Old 03-03-2021, 04:16 PM
Jamesey Jamesey is offline
 
Join Date: Feb 2008
Location: Hartlepool, England
Posts: 195
Default Engine Start

Quote:
Originally Posted by PhatRV View Post
I read early on that the RV12 has a safety switch to prevent the starting of the engine unless both of the wings are installed onto the fuselage.
Not quite correct. The wings pins must be in place. They can be in place without the wings being installed.
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  #6  
Old 03-03-2021, 04:27 PM
funflying funflying is offline
 
Join Date: Oct 2006
Location: arvada, co
Posts: 481
Default

Mine has the override button next the the starter which I hold down to start without the wings on.
Just did a wingless start, warm up, and run up to check things after changing the coolant hoses, and condition inspection. Also did a carb sync.
Didnít taxi around without the wings and climbing in and without the wing to step on makes me pay closer attention so as not to miss the step.
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  #7  
Old 03-03-2021, 05:23 PM
rileyspoon rileyspoon is offline
 
Join Date: Oct 2020
Location: WINSTON SALEM
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Yes I knew about the wing pin disconnect and override but I thought I had seen a post that express some concern about torque load on the fuselage when the wings were not attached?
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  #8  
Old 03-03-2021, 07:07 PM
RFSchaller RFSchaller is offline
 
Join Date: Oct 2010
Location: Phoenix, AZ
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I did my first few runs without the wings. No issues, but I got some funny looks as I taxied around the airport.😜
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  #9  
Old 03-04-2021, 07:38 PM
Crafting N112DR's Avatar
Crafting N112DR Crafting N112DR is offline
 
Join Date: Oct 2013
Location: Powell, OH
Posts: 289
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What you are speaking of is the twisting force (torsion) put on the airframe when the engine is starting. Without the wings on you put a higher twisting force (torsion) on the airframe without the wings to counter act the mass of the twisting airframe.
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  #10  
Old 03-04-2021, 09:47 PM
RFSchaller RFSchaller is offline
 
Join Date: Oct 2010
Location: Phoenix, AZ
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Dave,

Having the wings on would increase the moment of inertia, but the torque on the engine mount is the same with and without wings. The wings just make it less obvious when looking out the windo.

Rich
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