Rocket Racing League First Exhibition Race August 1st and August 2nd, 2008

On Tue, 1 Jul 2008 07:33:47 -0700 (PDT), Harry K
wrote:

One of the big problems is teh pit stop plus short flying time. Even
if they get it down to 15 minutes, they have each plane on the ground
for as long, or longer, than they ar flying. I can see the announcers
hyping the pit stops..."looks like Jim Campbell is going to set a new
course record folks, he is almost ready to leave the pits in under....
13.56!!"

With two planes going head to head in the exhibition it will be 15
minutes flying and 15 minutes for the crowd to make their own pit
stops for muchies and p calls. If that is the way it goes, I will bet
the at least half the crowd will find something better to do after the
first pit.

Actually, I got email the other day that says the RRL will be able to better the
15 minutes I'd previously guessed. If what I hear is right, I figure five
minutes might be doable. However, since the planes can't taxi under their own
power, that time has to include towing them back to the takeoff point.

Traffic control might be an issue. The planes are practically identical in
design. If they take off at about the same time, they are likely to run out of
fuel at about the same time, too. How about four planes maneuvering for
simultaneous deadstick landings?

The only solution is to stagger the takeoffs by several minutes, to ensure there
are planes that keep flying when others pit and the conflicts for runway space
don't happen. But then you've lost the head-to-head racing aspect...a Rocket
Racer with half its fuel burned will out-accelerate a plane that still has most
of its takeoff load. You get lots of fast passes, but not the breathtaking
duels of unlimited racing.

I think the question you have to ask yourself is, "Will people find the *style*
of racing interesting if they were prop-powered planes, instead?" The short
flights, the relatively high flying, the long powerless glides, the "virtual"
course that a spectator has to watch a video monitor to see, etc. If the answer
is "no," then rocket racing will be successful until the novelty of seeing
rocket planes glide around wears off.

Ron Wanttaja

On Jul 1, 10:13*am, Ron Wanttaja wrote:
On Tue, 1 Jul 2008 07:33:47 -0700 (PDT), Harry K
wrote:

One of the big problems is teh pit stop plus short flying time. *Even
if they get it down to 15 minutes, they have each plane on the ground
for as long, or longer, than they ar flying. *I can see the announcers
hyping the pit stops..."looks like Jim Campbell is going to set a new
course record folks, he is almost ready to leave the pits in under....
13.56!!"

With two planes going head to head in the exhibition it will be 15
minutes flying and 15 minutes for the crowd to make their own pit
stops for muchies and p calls. *If that is the way it goes, I will bet
the at least half the crowd will find something better to do after the
first pit.

Actually, I got email the other day that says the RRL will be able to better the
15 minutes I'd previously guessed. *If what I hear is right, I figure five
minutes might be doable. *However, since the planes can't taxi under their own
power, that time has to include towing them back to the takeoff point.

Traffic control might be an issue. *The planes are practically identical in
design. *If they take off at about the same time, they are likely to run out of
fuel at about the same time, too. *How about four planes maneuvering for
simultaneous deadstick landings?

The only solution is to stagger the takeoffs by several minutes, to ensure there
are planes that keep flying when others pit and the conflicts for runway space
don't happen. *But then you've lost the head-to-head racing aspect...a Rocket
Racer with half its fuel burned will out-accelerate a plane that still has most
of its takeoff load. *You get lots of fast passes, but not the breathtaking
duels of unlimited racing. *

I think the question you have to ask yourself is, "Will people find the *style*
of racing interesting if they were prop-powered planes, instead?" *The short
flights, the relatively high flying, the long powerless glides, the "virtual"
course that a spectator has to watch a video monitor to see, etc. *If the answer
is "no," then rocket racing will be successful until the novelty of seeing
rocket planes glide around wears off.

Ron Wanttaja

Not sure why everyone keeps making the comment about dead stick
landings. Rutan demonstrated the rocket plane at Oshkosh a couple of
years back with the full ability to start, stop, and restart the
engines.

On Tue, 1 Jul 2008 14:55:40 -0700 (PDT), BobR wrote:

Not sure why everyone keeps making the comment about dead stick
landings. Rutan demonstrated the rocket plane at Oshkosh a couple of
years back with the full ability to start, stop, and restart the
engines.

When Rutan flew, he was the only plane up there. When he hit the "go" button,
all he was expected to do was fly around the airport at least once, then land.
He could keep some fuel back in case he had to go around, or "blip" the rocket
to correct for an undershoot.

In contrast, of course, the RRL pilots will be busy flying the invisible course
and keeping from running into up to nine other rocket planes. It's a little
different problem....

According to the RRL web page, they're going to stagger the takeoffs, so that
should reduce the chances for simultaneous deadsticks. However, it's going to be
interesting if (for instance) a landing gear collapses and the plane stops on
the runway. I'm sure they'll have a backup runway, but the guys aloft may have
to scramble a bit. Trouble is, unless there's a second backup runway, racing
will have to stop until they get the primary cleared.

I surfed around the RRL web page, and found some technical data that I hadn't
noticed the last time I checked, several months back.

"...1,500 pound thrust rocket engine burning liquid oxygen (LOX) and kerosene...
Each X-Racer will be a single-pilot vehicle with an empty weight of roughly
1,000 lbs and a propellant weight of 1,000 lbs..."

Lox/Kerosene has a Specific Impulse of about 300 seconds, so this comes out to
200 seconds of engine run time (web page says 4 minutes of intermittent powered
flight, so that ties in). Ten minutes of glide time, Pit times are listed as
5-10 minutes. So that makes less than four minutes of powered flight per
aircraft every twenty to twenty-five minutes.

"...the Rocket Racing League will feature multiple races pitting up to 10 Rocket
Racers going head to head in a 4-lap, multiple elimination heat format on a
5-mile "Formula One"-like closed circuit raceway in the sky."

It's a twenty-mile course (five miles around, four laps). The planes should be
able to complete the course WITHOUT a pit stop...the plane has to average just
80 MPH during that 15-minute flight.

However, the web page says they have to pit after "3-4 laps." They may be
requiring some sort of fuel reserve. But it seems weird to plan for a 5-10
minute pit stop when the plane could practically *coast* around the course for
that last lap. My guess is that the "pit stops" are more to get planes ready
quickly for the next heat before the spectators wander away.

Still didn't' find anything on the web page about flight altitudes. It might be
something they leave up to the teams to decide...either go up high and coast
downhill at high speeds, or stay low and run the engine in short blips.

Ron Wanttaja

"Ron Wanttaja" wrote in message
...

Still didn't' find anything on the web page about flight altitudes. It
might be
something they leave up to the teams to decide...either go up high and
coast
downhill at high speeds, or stay low and run the engine in short blips.

Something I saw indicated the course would be 3-D. They would have "gates"
with upper, lower, left and right boundaries. So, they would have to climb,
dive, left and right maneuvers. Only the vectors between the gates would be
left up to the pilots, as well as the use of power.

The racers wouldn't be aiming for the same gate. The computer would have
gates for each racer, perhaps laid out side-by-side (with spacing for
safety), so the planes would appear to be racing but in reality flying
parallel courses.

I think that was on a TV spot or perhaps an animated internet movie clip.

Rich S.