Bob,
You are correct about that wing drop. I ran your video several
times to see if the wing tip had hit. It was good that you were only a
couple of feet off the ground when it did that roll. Be sure and keep the
speed up till you are ready to touch down. Do wheel landings with that
tail dragger. Plant it on the ground still flying. You say you have
modified the wing some already??
4800 rpm with that 84 pitch should work out to about 176 mph with no
slippage, so you are right in the ballpark. That means that you would get
close to 220 mph at 6K rpm! That is going to be a really fast plane!
Where are your radiator and oil cooler located? Do you have any
pictures of that install?
Bill B
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Rogers, Bob J.
Sent: Monday, March 30, 2009 12:08
PM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Re: Video of
First Flight - Mustang II w/ 13B Rotary Engine
Ed,
On takeoff, the turbo engine was producing
38 inches of manifold pressure and I still had 1/3 of my throttle left.
Because I have an aggressively pitched prop (68x 84), I think there was a
little blade stall until I got more speed. I climbed out at 120 mph and
over 1,000 fpm. I did not feel any “P” effect, but I may have
been too excited to notice. The controls are well balanced and the plane
will stay wherever you point it, hands off. My only problem so far is
that the right wing stalls first and causes a sharp wing drop. The
published fix is to make the outer leading edge more rounded on the right
wing. After some re-shaping, the stall was much improved on the second
flight, but I still need to do a little more work on the right wing to get it
to stall at the same time as the left wing.
The nose is longer than usual. I moved the
seats back some and added additional baggage space behind the seats, which
called for more weight on the nose. Based on my original W&B
estimates, that is where the engine should have been placed. It gave me
enough room to place the radiator and oil cooler between the engine and
firewall. As it turned out, the plane was slightly nose heavy with
the battery on the firewall, so I repositioned the battery in the tail.
Now the W&B is perfect. As a bonus, the battery is out of the engine
compartment where it would have gotten a lot of heat and there is more room on
the firewall for cooling air to exit. So far, I have been able to idle on
the ground for over 25 minutes without any overheating. My cowl flap can
be opened wide or closed to adjust for temperature needs. Even on climb
out, the engine barely got up to operating temp (180 degrees) with the cowl
flap half open. Yesterday, on the second flight, I closed the cowl flap
completely and ran the engine up to about 32 inches of manifold pressure and
got 190 on water temp after about five minutes. Speed was only 170 mph
(4800 rpm) at 3,500 feet and OAT was 55 degrees F. When it gets hot
during the summer months, cooling may be marginal at high power settings.
With the turbo, I should be able to fly at higher altitudes where it is cooler
and I can go faster. Time will tell. Right now, I am happy just to
be flying instead of building.
Bob
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Ed Anderson
Sent: Monday, March 30, 2009 9:32
AM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Re: Video of
First Flight - Mustang II w/ 13B Rotary Engine
Great looking flight, Bob!!
Looks like you took off less than WOT
during initial roll and then applied more power near/after lift off based on
the sound track I heard. I presume appreciable “P”
effect? Let us know what the numbers look like on your next flights
– temps as well as performance.
Great to see a project get airborne,
congratulations again!!
Best Regards
Ed
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Rogers, Bob J.
Sent: Monday, March 30, 2009 10:13
AM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Video of
First Flight - Mustang II w/ 13B Rotary Engine
If you are interested, there is a video of my first flight
at this link. http://www.eaa1246.org/videodisplay.asp?id=36
I have a lot of good friends who helped me make the event a
success. They took pictures and video and were there to support me.
I did my second flight yesterday and all went well.
The landing was much better.
Bob
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