mid-power launch pads at club launches

mid-power launch pads at club launches

Post by Beanbo » Fri, 07 Apr 2000 04:00:00



I'm the proud owner of some mid-power birds that fly on Econojets.  At the
two clubs I've launched at, there's been 2 and 3 groups of pads.  At both
clubs, my rockets have been much much farther than 30 feet away (min.
distance recommended by Aerotech) versus the low-power pads which were
15-20 feet away.  Of course, the reason being I've got 1/4 lugs on them.
One of the rockets is light enough (18 ounces or so) that I think a 3/16
rod would be fine, but then the whole safe minimum distance becomes an
issue.  

Any clubs out there have pads specifically set-up for mid-power birds?
How is it decided where a mid-power rocket should be launched from?

-Beanboy

 
 
 

mid-power launch pads at club launches

Post by John Marv » Fri, 07 Apr 2000 04:00:00


: I'm the proud owner of some mid-power birds that fly on Econojets.  At the
: two clubs I've launched at, there's been 2 and 3 groups of pads.  At both
: clubs, my rockets have been much much farther than 30 feet away (min.
: distance recommended by Aerotech) versus the low-power pads which were
: 15-20 feet away.  Of course, the reason being I've got 1/4 lugs on them.
: One of the rockets is light enough (18 ounces or so) that I think a 3/16
: rod would be fine, but then the whole safe minimum distance becomes an
: issue.  

: Any clubs out there have pads specifically set-up for mid-power birds?
: How is it decided where a mid-power rocket should be launched from?

I assume that the launches that you attended included the launching of
high power rockets. The minimum distance is determined by the model rocketry
and high power rocketry safety codes, and is based on the motor impulse. The
problem you are running into is that 1/4" rods are also used for a fair
number of H & I motor rockets. The minimum safe distance for those motors
is 100 ft. (200 ft. if more than one motor). The club is probably trying
to maximize use of their 1/4" pads, so they locate all of them 100 ft. or
more away, rather than locating some at the 30 ft. distance for mid power
rockets.

John Marvin

NAR 75392 L1

 
 
 

mid-power launch pads at club launches

Post by Dave Urbane » Fri, 07 Apr 2000 04:00:00


Quote:

> Any clubs out there have pads specifically set-up for mid-power birds?
> How is it decided where a mid-power rocket should be launched from?

UROC now runs launch pad banks at 50', 100' and 200'.  We have a
right-left range set up which allows us to fly off range left while range
right is loading and vice versa.  In March, we flew 234 rockets between
9:00 AM and 4:00 PM and this was with brand new equipment that had some
quirks to work out, a NAR contest and a killer dust-devil.

The 50' pads are for 1/4A through G rockets and complex rockets with 1/4A
through D motor.  They have 1/8", 3/16" and 1/4" rods.  When there's any
sort of a crowd, 50' is pretty good.  In fact, it's better for kids to be
further away than 20' because the increased distance from the rocket lets
them track it easier.

The 100' pads are for H through J rockets, and complex rocket with F-G
motors.  We have 3 blacksky rails in the club and these pads are usually
set up here too.

The 200' pads are for K motors and complex rockets with H-J motors.

If anyone wants to fly L or bigger motors, or clustered Ks we can
accommodate them by running wire out to 300' or 500' to their pad, but
prior arrangement (AKA a phone call) is necessary.

If some yo-yo showed up with an L or M powered rocket without prior notice
I don't think we'd turn them away.  However, since we'd have to suspend
flights while we laid out the wires, we'd probably make the person deal
with all the over-stimulated and restless kids (possibly a fate worse than
death).
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