Message
Steve, one possibility is
that the Ivo prop’s root section is creating back pressure in flight. Years ago
some canard flyers did testing in flight and found there was reverse flow around
the hub area. Ivo prop’s first 1/3section from the hub has very little pitch,
and the faster you go, it acts more like flat
disk.
Bulent
Steve,
I agree
that you should have enough exit area. Bulent may be onto
something with the prop theory. In tractor type planes, the IVO
is believed to create a lot of drag around the hub, which keeps the top
speed down. I always figured that canards were immune to this, since the
fuselage blocked the draggy area of the hub. Now that I think about it, I
believe Tracy mentioned that it had an adverse effect on his cooling
flow as well, and his inlet, is your
outlet.
If this
continues to be a problem, can you borrow a prop from someone else as a
test? This will be much easier for people using the -C box,
since it will be the same as a Lycoming. I guess a -B canard can exchange
with a tractor Lycoming. Man, starting to get dizzy thinking of this
:-)
Good
luck,
Rusty
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