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  #1  
Old 10-09-2018, 04:43 PM
rolick22's Avatar
rolick22 rolick22 is offline
 
Join Date: Oct 2013
Location: Powell, OH
Posts: 108
Default Legal max speed verses max structural speed.

First let me say I’m not endorsing anyone exceed the manufacturers Vne speed. I’m just putting out this question as a thought experiment, after all we are building experimental aircraft. Why not have experimental thoughts to.

What if the RV-12iS was designed for a higher max speed then published (say 150 Knots) then it is current certified max speed of 120 knots. So with that in mind is this max speed being restricted by the FAA LSA rule or is it a hard design max speed?
The reason I ask this is due to the FAA possibility rumors of increasing there max LSA speed to 150 knots and max weight to 3200.
Anyone who built a EAB RV12 flown over 120 knots?

okay now that’s enough experimental thought. Everyone back to reality.
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Last edited by rolick22 : 10-09-2018 at 05:35 PM. Reason: Typo
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  #2  
Old 10-09-2018, 05:31 PM
Mich48041 Mich48041 is offline
 
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Default

Does the FAA set the never exceed speed or maximum continuous cruise speed? Do not count on those FAA rumors coming true.
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  #3  
Old 10-09-2018, 05:52 PM
DBRuth DBRuth is offline
 
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Location: Cumming,GA
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Default Never exceed speed

The RV-12 has a 136knot TAS never exceed speed if I remember correctly.
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  #4  
Old 10-09-2018, 05:58 PM
Dave12 Dave12 is offline
 
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Default

Quote:
Originally Posted by Mich48041 View Post
Do not count on those FAA rumors coming true.
Couldn’t have said it better!
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  #5  
Old 10-09-2018, 06:10 PM
rocketman1988 rocketman1988 is offline
 
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Default And...

That “thought” experiment could end in disaster if not just a “thought” experiment...
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  #6  
Old 10-10-2018, 10:30 AM
rcarsey rcarsey is offline
 
Join Date: Jul 2012
Location: North Brunswick, NJ
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Default

Right.. 120kt CAS is the maximum permitted cruising speed in level flight at sea level. Vne is set by Vans (by the engineers / design limits). You could definitely make some speed mods and get your cruise speed higher.. I think maybe what the real question is "what did vans do to slow the plane down [for meeting the LSA requirements] that i can [easily] undo?"

Quote:
Originally Posted by Mich48041 View Post
Does the FAA set the never exceed speed or maximum continuous cruise speed? Do not count on those FAA rumors coming true.

Last edited by rcarsey : 10-10-2018 at 02:59 PM.
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  #7  
Old 10-10-2018, 11:39 AM
David Paule David Paule is offline
 
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Location: Boulder, CO
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Default

All the loads are determined, in part, by the speeds that the airplane is designed for. So while the FAA might establish something like the LSA rules, the designer, while keeping to them, designs the plane for the loads that those limitations impose.

Once the plane's design is frozen, they are very real things and really not a matter of the governmet's whim.

If you want a faster airplane, get a faster airplane.

Dave
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  #8  
Old 10-10-2018, 01:32 PM
AirHound AirHound is offline
 
Join Date: Oct 2006
Location: OFallon IL now, everywhere before
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Quote:
Originally Posted by rcarsey View Post
Right.. 120kt CAS is the maximum permitted cruising speed in level flight at sea level. Vne is set by Vans. You could definitely make some speed mods and get your cruise speed higher.. I think maybe what the real question is "what did vans do to slow the plane down that i can [easily] undo?"
Do the rest of the RV models have thicker skins? If so, would that be a significant factor for + speeds and weights?
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  #9  
Old 10-10-2018, 01:33 PM
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Piper J3 Piper J3 is offline
 
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Default

Quote:
Originally Posted by David Paule View Post

If you want a faster airplane, get a faster airplane.

Dave
That’s funny... Last week we were flying the RV-12 back from a small airport 15 miles south. C172 departed ahead of us and announced right turnout and destination same as us. We scooted right behind him and turned inside his right-crosswind and set the GPS for home. End of story is we were on the ground and taxiing to the hanger when he was just showing up on downwind. We heard him say he was on downwind and then a pause… “I need to get a faster airplane”.
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  #10  
Old 10-10-2018, 01:55 PM
rocketman1988 rocketman1988 is offline
 
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Location: Sunman, IN
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Default Speed

When it comes to max speeds, trust the engineers. TLAR engineering isn’t a good plan when dealing with potential flutter issues...
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RV-10
Structure - 90% Done
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Doors - Done
On Gear
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ShowPlanes Cowl with Skybolts Fitted - Beautiful

Dues Paid 2017,...Thanks DR+
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