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  #11  
Old 08-23-2021, 12:20 AM
NinerBikes NinerBikes is offline
 
Join Date: Dec 2018
Location: Granada Hills
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Quote:
Originally Posted by CaptBob View Post
Great input WRT the RV-12 rib and spar aluminum thickness, NinerBikes! That's the kind of specific insight I'm looking for.

I believe I read on the website that the RV-12 is an aerobatic airplane -- I would assume it's pretty easy to exceed Vne on the backside of a loop if you aren't careful about holding in the G-loading, correct?

Bob Jackson
N2XF

PS I'm actually a lot more of an Electrical than an Aero engineer, and although I do have a MS in Aeronautical Systems (courtesy of the Navy) my aerodynamics theory is not that strong!
RV-6 7 and 8 are +6 G, -3G and rated mild aerobatic, not like an Extra 300. RV-9 and RV-12 models are rated "Utility"... No spin planes.


Spend some more time on Van's website to gain more familiarity with the various models and their capabilities, performance, and specifications.
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  #12  
Old 08-23-2021, 08:11 AM
Amadeus Amadeus is offline
 
Join Date: Nov 2020
Location: Basalt, CO/Lexington, KY
Posts: 85
Default RV-9A

The RV-12 was designed to meet the needs of a certain niche. Look at the RV-9A. Build costs are very similar so why try to make impossible changes to the -12 when the -9A has everything you are wanting to achieve?
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  #13  
Old 08-23-2021, 01:27 PM
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hamblin10 hamblin10 is offline
 
Join Date: Aug 2021
Location: Owasso, OK
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As a structural aerospace engineer I can tell you the Vne is more based on flutter response than actual airloads. If you exceed Vne and experience flutter your aircraft will come apart as if a bomb went off inside. You will not have time to even start throttling back. I recommend NOT placing a larger engine on. This is not a street rod.
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RV-12iS in progress. N993EZ
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  #14  
Old 08-23-2021, 01:31 PM
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rvbuilder2002 rvbuilder2002 is offline
 
Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,667
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Quote:
Originally Posted by NinerBikes View Post
RV-6 7 and 8 are +6 G, -3G and rated mild aerobatic, not like an Extra 300. RV-9 and RV-12 models are rated "Utility"... No spin planes.
Utility category is 4.4 G's
That is what the RV-9 was designed to meet.

For LSA it is 4.0 G's
That is what the RV-12 was designed to meet.
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  #15  
Old 08-23-2021, 02:20 PM
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Piper J3 Piper J3 is offline
 
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I would watch this... https://youtu.be/_OuNJ14RyaQ
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  #16  
Old 08-23-2021, 03:37 PM
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Bernardo Bernardo is offline
 
Join Date: Aug 2020
Location: Portland, OR
Posts: 21
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Quote:
Originally Posted by CaptBob View Post
... I see no reason why standard E-AB flight testing can’t be down with incremental flutter testing to extend the Vne well above even the cruising (and ‘downhill’) airspeeds achievable as configured with the bigger 915iS engine...
I see a reason: Flutter.

Watch this video:
https://www.youtube.com/watch?v=egDWh7jnNic#t=95
Do you really want to be the pilot of an airplane that is going through this?
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Worked on wind-tunnel research, on design & modeling of rocket & jet engines, control systems for UAVs & spacecraft, jetliner maintenance planning, lab tests & computer modeling of innovative aero structures, future airplane design… But I have always wanted to work for a small company, on airplanes optimized for fun rather than profit, and no airplane is more fun than an RV!
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  #17  
Old 08-23-2021, 05:59 PM
JosephineJ79 JosephineJ79 is offline
 
Join Date: Jul 2010
Location: OSH WI
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Well of course airfoils are supposed to flop up and down. Haven't you ever watched birds fly?
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