I discussed the split-flap thing with Mark Drela a while back while
doing the prototype build for Denny's EZ Bubble Dancer:
Mark said:
...
The other argument -- the stock spoiler is too powerful --
is sorta like saying my Maserati has too much braking power.
It usually comes from people who think of the spoiler
as an on/off device, rather than something you modulate.
About the only advantage of the split spoiler is that it
reduces the required elevator compensation. This was
attractive in the days of dumb radios, but not now.
Small compensation is also an issue with hinged stabs:
If the BD had a conventional hinged stab, then it would need
about 9-10 degrees of elevator compensation, which would
indeed degrade its control power on landing. But with the
all-moving tail this is a non-issue.
Ed Anderson wrote:
3) Split spoilers - I can't say how it works with one big spoiler but mine
comes down very nicely and I don't feel I have a pitch problem. I do use
elevator comp mix but it works very smoothly.
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