Can I reduce the delay in Aerotech motors?

Can I reduce the delay in Aerotech motors?

Post by 10 coun » Mon, 12 Nov 2001 23:18:48



I've got several Aerotech single-use "G" motors with 10 second delays.
I need delays of around 4-7 seconds. Any way to reduce the delay on
these?

Thanks.

 
 
 

Can I reduce the delay in Aerotech motors?

Post by Jerry Irvi » Mon, 12 Nov 2001 23:53:31



Quote:

> I've got several Aerotech single-use "G" motors with 10 second delays.
> I need delays of around 4-7 seconds. Any way to reduce the delay on
> these?

> Thanks.

remove the ejection and save it, drill out 1/32" of delay material (grey)
for every 1 second of delay to reduce.  Reinstall ejection and a cap.

Drill by hand.  Mark depth by a piece of masking tape or something indexed
to the bulkhead epoxy.

It works reliably and used to be recommended by the manufacturer.

Jerry

--
Jerry Irvine, Box 1242, Claremont, California USA

Bring common sense back to rocketry administration.

 
 
 

Can I reduce the delay in Aerotech motors?

Post by Joel » Mon, 12 Nov 2001 23:57:47


I didnt know you could remove the delay in a single use without ruining the
case...

JR 77267
L1

.

Quote:


> > I've got several Aerotech single-use "G" motors with 10 second delays.
> > I need delays of around 4-7 seconds. Any way to reduce the delay on
> > these?

> > Thanks.

> remove the ejection and save it, drill out 1/32" of delay material (grey)
> for every 1 second of delay to reduce.  Reinstall ejection and a cap.

> Drill by hand.  Mark depth by a piece of masking tape or something indexed
> to the bulkhead epoxy.

> It works reliably and used to be recommended by the manufacturer.

> Jerry

> --
> Jerry Irvine, Box 1242, Claremont, California USA

> Bring common sense back to rocketry administration.

 
 
 

Can I reduce the delay in Aerotech motors?

Post by buff.. » Tue, 13 Nov 2001 01:06:49


You do it through the touch hole, that's why Jerry said, "indexed to
the bulkhead epoxy"



Quote:
>I didnt know you could remove the delay in a single use without ruining the
>case...

>JR 77267
>L1


>.


>> > I've got several Aerotech single-use "G" motors with 10 second delays.
>> > I need delays of around 4-7 seconds. Any way to reduce the delay on
>> > these?

>> > Thanks.

>> remove the ejection and save it, drill out 1/32" of delay material (grey)
>> for every 1 second of delay to reduce.  Reinstall ejection and a cap.

>> Drill by hand.  Mark depth by a piece of masking tape or something indexed
>> to the bulkhead epoxy.

>> It works reliably and used to be recommended by the manufacturer.

>> Jerry

>> --
>> Jerry Irvine, Box 1242, Claremont, California USA

>> Bring common sense back to rocketry administration.

 
 
 

Can I reduce the delay in Aerotech motors?

Post by Greg Cisk » Tue, 13 Nov 2001 01:26:23



.

Quote:
> remove the ejection and save it, drill out 1/32" of delay material (grey)
> for every 1 second of delay to reduce.  Reinstall ejection and a cap.

Huh.

Quote:
> Drill by hand.  Mark depth by a piece of masking tape or something indexed
> to the bulkhead epoxy.

> It works reliably and used to be recommended by the manufacturer.

And it will make your motors uncertified. You should not be able to
launch them at NAR certified events. I presume the same for TRA.

It doesn't really matter if it was reccomended by the MFR. What does
NAR and TRA think?

You are not really making your own rocket engines are you? Wow.

--


Quote:
> Jerry

> --
> Jerry Irvine, Box 1242, Claremont, California USA

> Bring common sense back to rocketry administration.

 
 
 

Can I reduce the delay in Aerotech motors?

Post by 10 coun » Tue, 13 Nov 2001 01:29:09




Quote:
>>You are not really making your own rocket engines are you? Wow.

No mommy I am not.
 
 
 

Can I reduce the delay in Aerotech motors?

Post by Jerry Irvi » Tue, 13 Nov 2001 01:36:22



Quote:



> .
> > remove the ejection and save it, drill out 1/32" of delay material (grey)
> > for every 1 second of delay to reduce.  Reinstall ejection and a cap.

> Huh.

> > Drill by hand.  Mark depth by a piece of masking tape or something indexed
> > to the bulkhead epoxy.

> > It works reliably and used to be recommended by the manufacturer.

> And it will make your motors uncertified. You should not be able to
> launch them at NAR certified events. I presume the same for TRA.

> It doesn't really matter if it was reccomended by the MFR. What does
> NAR and TRA think?

They ALLOW it when recommended by the manufacturer.  Aerotech stopped
recommending it when they learned over 20% of their customers were "too
stupid" (insert your own characterization) to do it right.  On the one
hand Aerotech was right.  On the other hand allowing it makes it legal for
the 80% of the people who are not "too stupid" (same comment).

Jerry

Quote:

> You are not really making your own rocket engines are you? Wow.

> --


> > Jerry

> > --
> > Jerry Irvine, Box 1242, Claremont, California USA

> > Bring common sense back to rocketry administration.

--
Jerry Irvine, Box 1242, Claremont, California USA

Bring common sense back to rocketry administration.
 
 
 

Can I reduce the delay in Aerotech motors?

Post by Bobby » Tue, 13 Nov 2001 03:12:15


What is the Bottom Line?  Is it currently permitted by NAR and / or Tripoli
for a user to modify the delay element of a motor and still remain legal by
their rules? Given the fact that AT is no longer recommending it for what
ever the reason.

--
Bobby B
NAR 79350 L1

.

Quote:





Quote:
> > .
> > > remove the ejection and save it, drill out 1/32" of delay material
(grey)
> > > for every 1 second of delay to reduce.  Reinstall ejection and a cap.

> > Huh.

> > > Drill by hand.  Mark depth by a piece of masking tape or something
indexed
> > > to the bulkhead epoxy.

> > > It works reliably and used to be recommended by the manufacturer.

> > And it will make your motors uncertified. You should not be able to
> > launch them at NAR certified events. I presume the same for TRA.

> > It doesn't really matter if it was reccomended by the MFR. What does
> > NAR and TRA think?

> They ALLOW it when recommended by the manufacturer.  Aerotech stopped
> recommending it when they learned over 20% of their customers were "too
> stupid" (insert your own characterization) to do it right.  On the one
> hand Aerotech was right.  On the other hand allowing it makes it legal for
> the 80% of the people who are not "too stupid" (same comment).

> Jerry

> > You are not really making your own rocket engines are you? Wow.

> > --


> > > Jerry

> > > --
> > > Jerry Irvine, Box 1242, Claremont, California USA

> > > Bring common sense back to rocketry administration.

> --
> Jerry Irvine, Box 1242, Claremont, California USA

> Bring common sense back to rocketry administration.

 
 
 

Can I reduce the delay in Aerotech motors?

Post by Jerry Irvi » Tue, 13 Nov 2001 03:24:46



Quote:

> What is the Bottom Line?  Is it currently permitted by NAR and / or Tripoli
> for a user to modify the delay element of a motor and still remain legal by
> their rules? Given the fact that AT is no longer recommending it for what
> ever the reason.

No but Aerotech can change that unilaterally.

--
Jerry Irvine, Box 1242, Claremont, California USA

Bring common sense back to rocketry administration.

 
 
 

Can I reduce the delay in Aerotech motors?

Post by Joel » Tue, 13 Nov 2001 03:48:41


Sorry,
erong message
JR
77267
L1

Quote:
> Why not go with a Pro 38???

> JR
> 77267
> L1


> > I've got several Aerotech single-use "G" motors with 10 second delays.
> > I need delays of around 4-7 seconds. Any way to reduce the delay on
> > these?

> > Thanks.

 
 
 

Can I reduce the delay in Aerotech motors?

Post by Joel » Tue, 13 Nov 2001 03:47:49


Why not go with a Pro 38???

JR
77267
L1

Quote:
> I've got several Aerotech single-use "G" motors with 10 second delays.
> I need delays of around 4-7 seconds. Any way to reduce the delay on
> these?

> Thanks.

 
 
 

Can I reduce the delay in Aerotech motors?

Post by Bob Kapl » Tue, 13 Nov 2001 08:24:44


Quote:

> What is the Bottom Line?  Is it currently permitted by NAR and / or Tripoli
> for a user to modify the delay element of a motor and still remain legal by
> their rules? Given the fact that AT is no longer recommending it for what
> ever the reason.

NO! Not for Aerotehc motors. I can only recall 2 manufacturers ever
endorsing changing motor delays: Synerjet and now Cessaroni. But with
Cessaroni you can't just choose any value, you have to select one of 4 and
use their rather neat tool that works for those 4 values and nothing else.

        Bob Kaplow      NAR # 18L       TRA # "Ctrl-Alt-Del"

Kaplow Klips & Baffle:      http://www.nira.chicago.il.us/Leading_Edge/MayJun00.pdf
NIRA:   http://www.nira.chicago.il.us  NAR:    http://www.nar.org

        We have awakened a sleeping giant and instilled in it a terrible
        resolve. -- Admiral Isoroku Yamamoto, WWII.

        Support Freedom: http://www.indefenseoffreedom.org/

 
 
 

Can I reduce the delay in Aerotech motors?

Post by The Silent Observe » Tue, 13 Nov 2001 08:27:32


Quote:

> What is the Bottom Line?  Is it currently permitted by NAR and / or Tripoli
> for a user to modify the delay element of a motor and still remain legal by
> their rules? Given the fact that AT is no longer recommending it for what
> ever the reason.

Bottom line: this procedure is permitted by NAR only on Pro38 motors,
when undertaken in accordance with Ceasaroni's instructions for delay
adjustment.  Any other modification of the delay converts the motor from
a certified, legal model or HRP motor into either an illegal firework or
an amateur/experimental motor, depending on who you believe.

--
This space temporarily vacant.  Look for more wit and wisdom in the
next iteration.

Donald Qualls, aka The Silent Observer           NAR # 70141-SR Insured
Rocket Pages                http://silent1.home.netcom.com/launches.htm
Telescope Pages            http://silent1.home.netcom.com/astronomy.htm
Lathe Pages           http://silent1.home.netcom.com/HomebuiltLathe.htm

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

 
 
 

Can I reduce the delay in Aerotech motors?

Post by Jerry Irvi » Tue, 13 Nov 2001 08:28:12



Quote:



> > What is the Bottom Line?  Is it currently permitted by NAR and / or Tripoli
> > for a user to modify the delay element of a motor and still remain legal by
> > their rules? Given the fact that AT is no longer recommending it for what
> > ever the reason.

> NO! Not for Aerotehc motors. I can only recall 2 manufacturers ever
> endorsing changing motor delays: Synerjet and now Cessaroni. But with

And USR and AT

Quote:
> Cessaroni you can't just choose any value, you have to select one of 4 and
> use their rather neat tool that works for those 4 values and nothing else.

>         Bob Kaplow      NAR # 18L       TRA # "Ctrl-Alt-Del"

> Kaplow Klips & Baffle:

http://www.nira.chicago.il.us/Leading_Edge/MayJun00.pdf

Quote:
> NIRA:   http://www.nira.chicago.il.us   NAR:    http://www.nar.org

>         We have awakened a sleeping giant and instilled in it a terrible
>         resolve. -- Admiral Isoroku Yamamoto, WWII.

>         Support Freedom: http://www.indefenseoffreedom.org/

--
Jerry Irvine, Box 1242, Claremont, California USA

Bring common sense back to rocketry administration.
 
 
 

Can I reduce the delay in Aerotech motors?

Post by RayDunak » Tue, 13 Nov 2001 12:07:28


<<What is the Bottom Line?>>

Adjusting the delay is a Very Bad Thing, no matter how safe and reliable it
actually is. Why, if you were to adjust the delay, the stars would fall from
the sky, the mountains would crumble, all life would be snuffed out and the
universe would implode!

At least, that's what some would have you believe.