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Old 10-11-2018, 07:13 AM
Awd2gen Awd2gen is offline
Join Date: Dec 2013
Location: Frederick, MD
Posts: 34

I've had similar thoughts as the original poster. Not so much as a "How can I work around the LSA requirements" but rather, if the rules changed and I was say in the middle of building a 12iS would I be able to upgrade with say a different power plant and wings or would it require an entirely new build all together..

I love the 12 for the simplicity and its abilities but if I could have 150kts instead of 120kts in the same platform I'd happily accept and make accommodations
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Old 10-11-2018, 12:56 PM
sblack sblack is offline
Join Date: Dec 2009
Location: Montreal
Posts: 1,321

Flutter would be the issue here. Not static loads due to skin thickness. In fact in level flight the loads would not really change, you are still flying 1g. If the vans folks cleared the airplane to 120 plus an allowable margin, then that's the envelope. Could it do more without coming apart? Good question. I doubt very much that they looked at it nor was there any reason to.

In the immortal words of Clint Eastwood: "do you feel lucky punk?".
Scott Black
RV 4, O-320, wood prop, MGL iEfis Lite
VAF dues 2019
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Old 10-11-2018, 05:32 PM
rvbuilder2002 rvbuilder2002 is offline
Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 8,114

Airplanes are designed to meet many requirements that are influenced by speed.

One of them is flutter, but there are numerous others.

One important one is design considerations for gust loads.
Likely all pilots know that in turbulence, slowing down reduces how rough the ride is. Inversely, the faster you go, the worse the ride is.

Airplanes are designed to tolerate a specific gust load at max structural cruise speed. If you make modifications that change the max. speed capability, but nothing is done to the structure, you would be at risk of structural damage or failure because of gust loading while flying at the higher speed.
Any opinions expressed in this message are my own and not necessarily those of my employer.

Scott McDaniels
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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Old 10-11-2018, 06:36 PM
rocketman1988 rocketman1988 is offline
Join Date: Jun 2010
Location: Sunman, IN
Posts: 1,487
Default In other words...

Trust the Engineers
Aerospace Engineer '88

Structure - 90% Done
Cabin Top - Aaarrghhh...
EFII System 32 - Done
290 HP Barrett Hung
ShowPlanes Cowl with Skybolts Fitted - Beautiful

Dues Paid 2018,...Thanks DR+
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