Loc IV Question ----need help

Loc IV Question ----need help

Post by Derrick MacDougal » Wed, 13 Aug 1997 04:00:00



I have build a Loc/Precision LOC IV rocket and have flown it on a
Aerotech G80-10. I was wondering if the rocket is too heavy for an
Aerotech F14-6J Single use motor??  My rocket weighs about 29oz.
Thanks in advance
Derrick

 
 
 

Loc IV Question ----need help

Post by Thomas Parke » Wed, 13 Aug 1997 04:00:00


Quote:

> I have build a Loc/Precision LOC IV rocket and have flown it on a
> Aerotech G80-10. I was wondering if the rocket is too heavy for an
> Aerotech F14-6J Single use motor??  My rocket weighs about 29oz.
> Thanks in advance
> DerrickFriend I have flown mine on a Vulcan H-100ss with a 7 sec delay to

certify Level 1. That was on July 5 this year. Flew it the next day on a
Aerotech G80-7 ; bad delay had a lawn dart then ejection. Crimped the top
10 inches of the tube and flattened the nose cone. Rebild complete. Will
fly on the 23rd 0f August. Only mods to kit was to fiberglass the fin
root. I think 10 sec might be a little long.
Best of luck on the flight,I'll be waiting for a report.

        By the way I forgot to mention that I fly at Whittakers NC,just
out side of Rocky Mount.

                                Thomas(Tommie) Parker
                                TRA# 5114       NAR# 69428sr
                                BAR after 25yrs

 
 
 

Loc IV Question ----need help

Post by Eric Steinber » Wed, 13 Aug 1997 04:00:00


Quote:

> I have build a Loc/Precision LOC IV rocket and have flown it on a
> Aerotech G80-10. I was wondering if the rocket is too heavy for an
> Aerotech F14-6J Single use motor??  My rocket weighs about 29oz.
> Thanks in advance
> Derrick

OK let's try the right Reply button this time:

DON'T DO IT!  It's a low-thrust long-burning motor.  Because of an error
in Aerotech's motor matrix I once flew a "Strong Arm" (18 oz) on an
F14-4J.  It made a great cruise missile for about 300 yds.  To AT's
credit, a new nose cone & upper body tube and it was good as new.  Use
at least an F52 with a short delay...  good luck

ES

 
 
 

Loc IV Question ----need help

Post by Tony Harrel » Wed, 13 Aug 1997 04:00:00


Quote:

> I have build a Loc/Precision LOC IV rocket and have flown it on a
> Aerotech G80-10. I was wondering if the rocket is too heavy for an
> Aerotech F14-6J Single use motor??  My rocket weighs about 29oz.
> Thanks in advance
> Derrick

I ran it on wRASP and I don't think you can. It only hit mach .09 max. I
don't know what the min. speed is before the fins stabilize.
Tony
 
 
 

Loc IV Question ----need help

Post by Bob Kapl » Thu, 14 Aug 1997 04:00:00


Quote:

> I have build a Loc/Precision LOC IV rocket and have flown it on a
> Aerotech G80-10. I was wondering if the rocket is too heavy for an
> Aerotech F14-6J Single use motor??  My rocket weighs about 29oz.

An F14 would be really marginal for this rocket. Better to use an F25 or an
F50.

        Bob Kaplow      NAR # 18L       TRA # "Abort, Retry, Fail?"

 
 
 

Loc IV Question ----need help

Post by The Silent Observe » Thu, 14 Aug 1997 04:00:00


Quote:


> > Use at least an F52 with a short delay...  good luck

> F52s remain uncertified...

>         Bob Kaplow      NAR # 18L       TRA # "Abort, Retry, Fail?"

Fortunately, the F50 will do much the same job...  B)

--
Take no thought for the morrow; that's your privilege.  But don't
complain if when it gets here you're off guard.  -- John Brunner

Donald Qualls, aka The Silent Observer           NAR # 70141-SR Insured
Rocket Pages             http://members.aol.com/silntobsvr/launches.htm

Opinions expressed are my own -- take them for what they're worth
and don't expect them to be perfect.

 
 
 

Loc IV Question ----need help

Post by Yves Lacom » Thu, 14 Aug 1997 04:00:00


On Tue, 12 Aug 1997 18:53:56 -0300, Derrick MacDougall

Quote:
>I have build a Loc/Precision LOC IV rocket and have flown it on a
>Aerotech G80-10. I was wondering if the rocket is too heavy for an
>Aerotech F14-6J Single use motor??  My rocket weighs about 29oz.

NO!!!  Forget it.  Last weekend, we launched a couple of rockets with
F14-4s and F14-6s (specifically, AT Wart Hogs) and in both cases, the
rockets weathercocked heavily and basically went into cruise missile
mode for god knows how far away.   The LOC IV is alot heavier and I
suspect the F14 wouldn't even get it off the pad.

Note: The F14 is a recommended motor in the motor matrix for the AT
Wart Hog.  Don't trust the matrix with the black jack motors!  

I flew my LOC IV twice with an F50-4 SU motor and the flights were
just peachy.  An F25-4 SU _might_ work, however it will probably have
a bigger tendency to weathercock.  

F14s are marginal in anything other than say, a very light LMR rocket
like the AT Cheetah/Mustang/Arreaux or a light-weight LOC kit like an
Aura, Legacy or Graduator.  Stick with F25s/F50s or their RMS
equivalents.

--
Yves

 
 
 

Loc IV Question ----need help

Post by Bob Kapl » Thu, 14 Aug 1997 04:00:00


Quote:


>> F52s remain uncertified...

> Right... I meant to say F50 ;)... BTW, what is the story on the F52?
> Did it lapse?  Is it a new product?  Is certification in the works?

For all the AT 18-24-29 motors that are not certified, they never were. They
were introduced and shipped without ever being tested by anyone. Eventually,
some were submitted for certification, but many failed because their delays
were way short. That's where things sit today. Nothing was ever fixed or
relabeled, and nothing was ever resubmitted.

        Bob Kaplow      NAR # 18L       TRA # "Abort, Retry, Fail?"

 
 
 

Loc IV Question ----need help

Post by Bob Kapl » Thu, 14 Aug 1997 04:00:00


Quote:

> Use at least an F52 with a short delay...  good luck

F52s remain uncertified...

        Bob Kaplow      NAR # 18L       TRA # "Abort, Retry, Fail?"

 
 
 

Loc IV Question ----need help

Post by Roy Gre » Thu, 14 Aug 1997 04:00:00


Quote:

>I have build a Loc/Precision LOC IV rocket and have flown it on a
>Aerotech G80-10. I was wondering if the rocket is too heavy for an
>Aerotech F14-6J Single use motor??  My rocket weighs about 29oz.
>Thanks in advance
>Derrick

it is MOST DEFINITELY too big for an F14-4, much less a -6.

besides being low average thrust, it is also only 65 NS total impulse.
It is also black-jack fuel, which can sometimes start slowly, which
would lead to either a power-prang or a land shark.

I have heard of someone flying a similar sized rocket on an F25-4 (a
full 80NS motor), but that it was a close call.   I never fly my NCR
Phantom (similar to the LOC IV) on anything less than an F50, though
an old friend insists he's flown his phantom on a E30.  hmm. might
work if only because of the thrust profile.
--------
Roy Green, Atlanta
NAR #12605
http://roygreen.home.mindspring.com/
to reply by E-mail, remove the 'xxx' from the address given

 
 
 

Loc IV Question ----need help

Post by The Silent Observe » Thu, 14 Aug 1997 04:00:00


Quote:

> I have build a Loc/Precision LOC IV rocket and have flown it on a
> Aerotech G80-10. I was wondering if the rocket is too heavy for an
> Aerotech F14-6J Single use motor??  My rocket weighs about 29oz.
> Thanks in advance
> Derrick

Yes, that rocket is too heavy for an F14 -- it'll come of the rod with
too little velocity, and will either weathercock terribly, or might
simply tip off at some random angle and take a cruise missle trajectory.
 If you can get an F40-6, you'll probably be closer to the mark, though
an F22 would be marginally acceptable.  Both of these are reloads for the
RMS 29/40-120 casing; in single-use, I'd suggest either the F25 or F50
with suitable delay.

--
Take no thought for the morrow; that's your privilege.  But don't
complain if when it gets here you're off guard.  -- John Brunner

Donald Qualls, aka The Silent Observer           NAR # 70141-SR Insured
Rocket Pages             http://members.aol.com/silntobsvr/launches.htm

Opinions expressed are my own -- take them for what they're worth
and don't expect them to be perfect.

 
 
 

Loc IV Question ----need help

Post by Eric Steinber » Thu, 14 Aug 1997 04:00:00


Quote:

> F52s remain uncertified...

Right... I meant to say F50 ;)... BTW, what is the story on the F52?
Did it lapse?  Is it a new product?  Is certification in the works?