|
Re: [FlyRotary] Re: 3rd flight
Bulent,
Thanks. I hadn't even considered that. I have a hershey kiss
sipper and flow guide on it, which I think will minimize it somewhat, but that
is a possibility.
I
haven't yet added any vortex generators in front of the NACA, and I checked with
john to see if he had, and if he had any photos. He sent me a link of Eric
Weslland who had done the testing of putting vortex generator on the
belly. Here is a link for the write up on it, if you're interested http://home1.gte.net/res08ahw/vg/cooling.doc.
I'm
going to give this a try first. If I even saw half of the results that he
saw, I'd be happy. I thought that it was very interesting that a 160 MPH,
he saw only 50 MPH air at the NACA inlet. He had to move the air speed
indicator inlet about 2" away before he saw his actual airspeed. With just
2 - 1" X 4" vortex generators located just behind the landing brake, he saw
actual airspeed at the NACA inlet. That is a significant
difference.
John
said that he had them on from day one, so I don't have any idea what difference
it will make until I try it.
I
didn't have any aluminum angle the right size, but I do still have plenty of
fiberglass, so 6 plies of BID, and a layer of peel ply later..... I'm waiting
for it to cure.
Steve
Brooks
Cozy
MKIV
Turbo
Rotary
On
6/2/04 7:29 AM, "Steve Brooks" <steve@tsisp.com>
wrote:
Rusty,
I had started with the stock Cozy cowling, and modified
it for the rotary. I left the original opening at the rear wide open
to start with. I figured that if cooling was good, I could start
closing it off. You can see the aft opening in the attached photo.
It is probably 2-3 times the sum of all 3
scoops.
Steve
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
|