BD-5 crash in Australia

In a previous article, Richard Riley said:
On Sat, 26 May 2007 16:57:54 +0000 (UTC),
(Paul Tomblin) wrote:
In a previous article, Richard Riley said:
On Wed, 23 May 2007 19:09:31 -0300, "Dave"
wrote:
Funny, I've noticed over the years that for the most part the more a person
or group calls on God, the more they love their enemy dead.


Have you ever met a Buddhist?

Obviously you never have.

Buddhists don't call on god. They don't have a god.

Apparently you haven't met many either.

Some Buddhists believe in a single God, some believe in multiple Gods.
Some don't. Some don't know.

The ones who believe in a single God or multiple Gods are following a
religion as well as Buddhism. Buddhism is not a theist religion.

necessary. Nevertheless, today many lay people in East Asian countries
pray to the Buddha in ways that resemble Western prayer - asking for
intervention and offering devotion.

Then those people understand Buddhism about as well as Jerry Falwell
understood the teachings of Christ.


--
Paul Tomblin http://blog.xcski.com/
....if Paul's really talking about truly average people, then they'd probably
die in either case, because common sense isn't.
-- Derick Siddoway

Stealth Pilot wrote:

holding the aircraft low to the ground and accelerating in level
flight does two things.
it gets you to a safer climbout speed faster.
if the engine does quit you avoid the spine destroying thump into the
ground.

Stealth Pilot

Take-offs in a Dyke Delta requires the same technique. It doesn't want
to climb out solidly until it reaches 80mph. If you try to pull it out
of ground effect to early, the drag increases to the point that
acceleration stops. Pulling the gear up gives you 20mph. I'm to
understand that there have been accidents where the pilot ran out of
runway, trying to pull the craft into the sky without enough speed, or
enough power to overcome the drag.

Lift off into ground effect at 60, and hold level as the gear comes up.
Accelerate to 100 to get solid control authority, then head for the
heavens.

On Thu, 24 May 2007 11:13:47 -0700, "Richard Isakson"
wrote:

"Stealth Pilot" wrote ...
holding the aircraft low to the ground and accelerating in level
flight does two things.
it gets you to a safer climbout speed faster.
if the engine does quit you avoid the spine destroying thump into the
ground.

That wouldn't help on the BD-5. The BD-5 is a very poorly designed airplane
and your friend had the quintessential BD-5 accident. There have been
several accidents and deaths along these lines. These usually happen early
in the testing program. The pilot is new to the airplane and the airplane
has an engine cooling problem. That's inherent in the design and the
designer never solved the problem. The pilot taxis out to the runway as the
engine compartment overheats causing a new problem in the fuel system. Once
on the runway, the pilot applies power pouring more heat into the
compartment. The engine lasts long enough to get in the air and the engine
quits. On the BD-5 all the big weights are down low. The fuel is on the
bottom of the airplane, the pilots center of gravity is low and the engine
is fairly low. That makes the airplane center of gravity low but the thrust
line is up at that top of the airplane. The high thrust line wants to push
the nose down so the pilot has to compensate with aft stick. Now the engine
stops. The clutch disengages the engine and the prop and the prop sits out
there windmilling. A windmilling prop is like a parachute, now trying to
pull the nose up. The airplane controls are commanding nose up already so,
between the controls and the prop, up the nose goes. If the pilot's not
spring loaded to shove the nose down, it won't go down. It will pitch up
violently and the g-loading will go up. This causes the wing skins to
wrinkle and that destroys the wing aerodynamics. The airplane does a high
speed stall and, without altitude to recover, it slams into the runway. If
the pilot's lucky. If not, the airplane stalls asymmetrically and
half-snaps to the inverted position and slams into the runway with generally
fatal results. Your friend was lucky.

Rich


the differences between these aeroplanes and the originals are subtle
and many. I just have not had the opportunity to discuss the comments
with the two guys. soon hopefully.
Stealth Pilot