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  #11  
Old 03-04-2021, 09:59 PM
Jake14 Jake14 is offline
 
Join Date: May 2014
Location: Seattle
Posts: 353
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here's a thread.....

https://vansairforce.net/community/s...d.php?t=150952
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  #12  
Old 03-05-2021, 06:52 AM
Crafting N112DR's Avatar
Crafting N112DR Crafting N112DR is offline
 
Join Date: Oct 2013
Location: Powell, OH
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Quote:
Originally Posted by RFSchaller View Post
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
I said nothing about the torque on the engine mount. I said airframe.


From Scott" The reason it is not recommended on the other RV models has nothing to do with fuselage strength (and it is not because of a fear of it rolling over). It is because of the inertial damping in roll that the wings provide.The majority of the shake induced by a Lyc. is in roll. Without wings installed, there is much less mass to limit the shake.
There are documented cases of RV's having elevators and rudder damaged because of an engine start/shut down without wings installed.
Can it be a problem with an RV-12? Probably not, but I cant' say for sure because we choose not to take the chance."
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Last edited by Crafting N112DR : 03-05-2021 at 06:56 AM.
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  #13  
Old 03-05-2021, 09:14 PM
RFSchaller RFSchaller is offline
 
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Location: Phoenix, AZ
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Can you point me to a discussion of those documented cases? I find it difficult to believe the tail feathers are that fragile, but I have an open mind to the data.
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  #14  
Old 03-06-2021, 06:37 AM
thiggins thiggins is offline
 
Join Date: Mar 2020
Location: Saluda,NC
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Quote:
Originally Posted by RFSchaller View Post
Can you point me to a discussion of those documented cases? I find it difficult to believe the tail feathers are that fragile, but I have an open mind to the data.
Look at the link in post #11 below. Vans (the kit manufacturer) says itís not recommended...So why would we think itís ok?!?

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  #15  
Old 03-06-2021, 07:29 PM
RFSchaller RFSchaller is offline
 
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Like I said, Iíd be interested in reading the documents on the documented cases to better understand exactly what happened. I have an open mind, I just like it when statements have some objective evidence to evaluate for myself.
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