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But the delay will burn at different rates DURING the motor burn depending on propellant type.
For instance the stock delay length for the E28-7T (Blue Thunder) is 0.438" whereas the E18-7W (White...

If you still have the remains, you could check if it included the correct delay.
An H242T-M (10sec) should have an RDK 10+. The element length is .469" and the spacer would be .375" long and black...

Here is my response to a previous thread on this matter:

http://www.rocketryforum.com/showthread.php?21121-Semroc-Saturn-1B-build&p=190111#post190111

Too late for yours, but for future builds.

In what may become a White House tradition (like pardoning turkeys) the President has released his picks for 2013.
He has Indiana, Florida, Louisville and Ohio State in the final four and Indiana...

Three years.
3.14159 rounds to 3.1416

Here is the original range of the American Bison:

http://en.wikipedia.org/wiki/File:Bison_original_range_map.svg

Central N.C. is at the eastern edge.
I remember from elementary history that...

I have to chime in on this discussion and agree with Luke.
You can't have too big a battery. Sure, you don't want to lug a bus battery into the middle of a cow field.
But, the Estes 4 X AA system...

I remember a stretch when there was a guy at every show with a sign reading something like - "842 days since the last Darkstar", updated as necessary.
They finally played it, I hope he didn't miss...

I saw 40+ shows from '76 through the 80s.
Before the 'tapers' section and the tossed out mix board feeds, a friend would bring in a Sony and later a Nakamichi and tape up front with mics on...

Here is an XLS file with 29, 38 and 54mm RDKs and HDK (hobbyline) motor delays.
Tabs for each are at the bottom.
105189

I haven't yet found the HDK chart Bob mentioned.
This is the RDK (HPR style) chart for 29mm and 38mm.
It is old and doesn't include the newer motors.105185
Tim

It's deja vu all over again.
A similiar poll came up before:
http://www.rocketryforum.com/showthread.php?23990-Real-Miracle&highlight=mayonaise

Here's my post from then:

To be labeled...

The PML packing instructions are here:

https://publicmissiles.com/secure/parachutepacking.asp

This is pretty much what I've been doing for years except for the smaller diameter rockets where I...

I never wear a hat, unless it's part of a costume.
However, I was brought up that men remove a hat indoors. This was in the fifties when hats were much more prevalent.

Here's a link to the Emily...

I wonder what's the premium on a 10 million dollar policy for a satellitite on a fairly new launch system.
If anyone gets paid it will be lawyers. On both sides.

From the link:
"It is important...

I don't see it mentioned in the hobby instructions, but I knew I had seen a reference to greasing the liner somewhere.

Here are the instructions for 38/120-360W motors (ex. - H123W):

...

For ease of use and reliability, the interlock clip is the way to go. Just drag a piece of folded sandpaper through the contacts between flights to keep them clean.
The problem with the...

The 50th anniversary refers to the U.K. release where it went to number 17 (or was it 7?) on the 'charts'.
Two years later it was released in the states and went to #1. Ed Sullivan, Shea and the...

Here's a link to the RCS drawing for nozzle #01350:

http://static.fw1.biz/templates//170652/myimages/rcs_01350_nozzle_dwg.pdf

It shows the undrilled throat to be 0.141" (+/- 0.002")
(9/64" is...

Commonwealth shows one Rouse-Tech 29/40-120 in stock at $35.99
http://www.cdimodelrocketry.com/products.php?cat=Rouse-Tech
He also has the AeroTech version at $50something.

HobbyLinc generally...

Well, after all, it is "Vintage" rocket fuel.
They are the fuel containers which came with the Scientific Products 'Alpha-1' rocket.
Here is a PDF of the Life magazine article from 1958:...

Turner Classic Movies is running Elvis films (14 of them) all day.
At least 2 with a young Terry Garr as a backup dancer.

50 years ago everyone would have had a tie and most would be smoking a cigarette. I don't see either in this group, now it's bananas and peanuts.

Here's a graphic of the landing process:...

The Rocketry On Line auctions had a system called (I think) Sniper Guard.
If you were the leading bidder and were outbid at the last moment, without time to respond, you were given a couple of...

Fans may want to make a note.
Turner Classic Movies is having an evening of Griffith's films on Wednesday, July 18th.
Beginning at 8:00 PM.
A Face in the Crowd (1957)
No Time for Sergeants (1958)...

Me too on the H165. That is, if you're sure it fits the 29/180.
The H165-M (10 sec.) is the only motor for the 29/180 with a .500" long delay grain.
The H165-M assembly drawing shows the nozzle to...

"All the plugged motors have smoke grains.'
Most do.
But, the long burn 38mm I49N (38/360) and I59WN (38/460) don't.
There maybe more in the larger motors.
These two require the use of the...

You can change the material thickness and the rectangular representation will change accordingly.
However, the component mass will change too.
Not a problem as long as you use the actual weight in...

"Compressor Question from a guy who would have trouble just dipping a rocket in a bucket of paint:
If I had a pressure regulating valve, would a plain compressor from Lowes, made for running nail...

That's what I'd say. The delay insulator for the E18 should be .613" long versus .75" long for the 29 mm hobby loads.