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I have a question about spoiler/speed breaks for my IVP project and I'm
hoping some of you aerospace engineers or other helpful folks will give your
opinions.
I don't know how many of you recall Don Goetz's IVP with his hydraulic
spoilers that were controlled by an additional manual drum like the flaps
and gear. I copied his design for the most part except that I am using
electrical solenoids to actuate a spool valve and poppet valve to control
the spoilers. The spoilers themselves are pop up doors over the same bay
where the electrical speed breaks normally go. I think they are about 4"
high by 12" wide and fully deployed approach a 90 degree tangent to the wing
surface.
When I first designed this system several years ago I had friends in the
Washington Lancair builders group - one a test pilot and one a Boeing
aerodynamic engineer. Both thought the system made sense and to my
recollection neither seemed to have worries about safety of flight issues
with the system.
Now I have someone assisting with the final stages of building and he is
quite concerned that there could be split deployment, or some sort of
asymmetric forces introduced that would compromise safety of flight. He's
also wondering if deployment of these devices could lower the elevator
effectiveness and that could compromise safety.
I'm attaching a schematic of the system - it shows only one hydraulic
actuator but the plumbing is split to supply one on each side.
Thanks for your consideration and help.
Regards,
John Barrett, CEO
Leading Edge Composites
PO Box 428
Port Hadlock, WA 98339
www.carbinge.com
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