Where To Find RMR FAQ and Other Newbie Questions

Where To Find RMR FAQ and Other Newbie Questions

Post by Matthew S Greenl » Thu, 25 Jul 1996 04:00:00



Quote:

>I'm still pretty new to rockets and have been flying Estes A thru D
>engines in a Wizard, Alpha 3, Big Bertha, Sidewinder, Bull Pup, Saturn
>1B, Black Brant, and Space Shuttle.  Any help with the following items
>would be appreciated.
>I'd like to get a copy of the r.m.r. FAQ.  I have web access and can
>get it from a web page.  Directions?

<SNIP>

   Check out http://hubcap.clemson.edu/~mgreenl/rocket.html

--
Matthew Greenlaw                         Mechanical Engineering

http://hubcap.clemson.edu/~mgreenl      

 
 
 

Where To Find RMR FAQ and Other Newbie Questions

Post by Dave Lyl » Thu, 25 Jul 1996 04:00:00


Quote:

>What I'd like to do is put a D engine in a Sidewinder.  I have seen
>notes on this that mentioned tube sizes, hence my question above about
>sources for tubes.

>The interest in Aerotech engines is to see if I can get one that fits
>in a C engine mount, but has more power - for my existing Sidewinder.

I'm real new to this too, probably newer than you.  AeroTech makes an
18mm "D" motor (D21 I think).  Don't know if it will fit in the same
mount as the Estes 18mm motor, though.  I've got a SkyWinder that I'd
like to try a "D" in.  Hopefully someone can answer that question for
both of us.

Quote:
>I read a recent letter about a multistage conversion of a Big Bertha.
>The writer used acronyms I could't decipher.  Can someone explain how
>to do this?

CHAD staging?  I had asked the same question.  It's CHeap And Dirty.
Just tape the booster motor onto the one installed in the rocket.
This will move the center of gravity quite a way aft, though, and
many models will not be stable in this configuration.

Quote:
>I also recently launched a Tornado into a light wind.  It just floated
>away - worse than a parachute recovery.  That was the second lost
>rocket in about 2 months.

My son took his Twister (aka Tornado) for a launch at school last Monday
(summer school enrichment science class).  It was short notice, and
I was unable to find any 1/2A engines locally, so I set him up with an
A8-3 and crossed my fingers.  He tells me it was a very impressive
flight (reportedly -into- the clouds) and with help from the rest of
the class, they recoved both pieces.  One was 3 blocks away in someones
back yard.

Dave

 
 
 

Where To Find RMR FAQ and Other Newbie Questions

Post by Mark W. How » Thu, 25 Jul 1996 04:00:00


<snip>

Quote:
>Any help with the following items would be appreciated.

>I'd like to find a source for Aerotech engines.

Try Mountainside Hobbies at:
http://msh.ptd.net/mshpage1.htm
also check the FAQ listing

Quote:
>The interest in Aerotech engines is to see if I can get one
>that fits in a C engine mount, but has more power - for my
>existing Sidewinder.

Aerotech makes both SU (Single Use) and RMS (Reloadable)
engines in the 18mm (C) motor size. They also make 24mm (D),
29mm, 38mm, 54mm, and 98mm sizes.  I recently put an 18mm SU
D21-4T in my Estes F14 Tomcat rocket glider....what a ride!

Quote:
>Anyways, thanks for any help with the above questions.

You're welcome.

Quote:

>Bob MacMillan


--
Regards,
M.Howe
"Eschew Obfuscation"

(Not affiliated with Mountainside Hobbies in any way...except
for being a VERY satisfied customer!)

 
 
 

Where To Find RMR FAQ and Other Newbie Questions

Post by Bob MacMill » Thu, 25 Jul 1996 04:00:00


I'm still pretty new to rockets and have been flying Estes A thru D
engines in a Wizard, Alpha 3, Big Bertha, Sidewinder, Bull Pup, Saturn
1B, Black Brant, and Space Shuttle.  Any help with the following items
would be appreciated.

I'd like to get a copy of the r.m.r. FAQ.  I have web access and can
get it from a web page.  Directions?

I have seen comments about custom making rocket bodies and motor
mounts.  I'd like to find a source for tubes for these in the Detroit
or Toronto areas.  I'd also like to find a source for Aerotech
engines.

What I'd like to do is put a D engine in a Sidewinder.  I have seen
notes on this that mentioned tube sizes, hence my question above about
sources for tubes.

The interest in Aerotech engines is to see if I can get one that fits
in a C engine mount, but has more power - for my existing Sidewinder.

I read a recent letter about a multistage conversion of a Big Bertha.
The writer used acronyms I could't decipher.  Can someone explain how
to do this?

I have a decent launch site, a park bordered on three sides by
farmers's fields.  Was there two nights ago on a perfect windless
evening and had no problem recovering the Alpha 3 and Bull Pup with
B6-4 engines to within 50 yards of the launch pad.  

On the same night, had the first flight of the D engined Black Brant.
Just as another poster mentioned, it goes out of sight until the chute
opens.  I can't measure altitude, but it was up very high.  It landed
about 300 yds away (must have been some wind higher up) in a field
where the corn was chest high.  I was able to recover it the next day
with the help of a very nice lady at the farm house who watched it
come down and wondered what the hell it was.  It was a relief to be
allowed into the field to find it.  Between my line of sight view from
the launch pad and her line of sight view, I found the intersecting
point and the rocket with no problem.

I also recently launched a Tornado into a light wind.  It just floated
away - worse than a parachute recovery.  That was the second lost
rocket in about 2 months.

Anyways, thanks for any help with the above questions.

Bob MacMillan

 
 
 

Where To Find RMR FAQ and Other Newbie Questions

Post by Mike Vande Bu » Fri, 26 Jul 1996 04:00:00



: >What I'd like to do is put a D engine in a Sidewinder.  I have seen
: >notes on this that mentioned tube sizes, hence my question above about
: >sources for tubes.
: >
: >The interest in Aerotech engines is to see if I can get one that fits
: >in a C engine mount, but has more power - for my existing Sidewinder.
: >

: I'm real new to this too, probably newer than you.  AeroTech makes an
: 18mm "D" motor (D21 I think).  Don't know if it will fit in the same
: mount as the Estes 18mm motor, though.  I've got a SkyWinder that I'd
: like to try a "D" in.  Hopefully someone can answer that question for
: both of us.

The Aerotech 18mm motors (both single use and reloadable) are exactly the
same size as the Estes/Quest 18mm A/B/C motors.  They not only are more
powerful than the black powder motors, they also have much stronger ejection
charges.  This _might_ be a problem for the Skywinder.  (Also, the delays
tend to be longer than marked, so get a shorter delay than you think you
need.)

I have flown Aerotech D21 and E25 motors in a stock Ectes Fire Streak
without any damage using only yellow glue.  (The through-the-wall fin mounts
really hold up to the extra stress of the composite propellant.)

--

 
 
 

Where To Find RMR FAQ and Other Newbie Questions

Post by Rick Taylo » Fri, 26 Jul 1996 04:00:00


Quote:

> I have a decent launch site, a park bordered on three sides by
> farmers's fields. [snip]

> On the same night, had the first flight of the D engined Black Brant.
> Just as another poster mentioned, it goes out of sight until the chute
> opens.  I can't measure altitude, but it was up very high.  It landed
> about 300 yds away (must have been some wind higher up) in a field
> where the corn was chest high. [snip]

Sounds like your launch site will improve greatly after harvest!  :-)
 
 
 

Where To Find RMR FAQ and Other Newbie Questions

Post by Brian D » Sat, 27 Jul 1996 04:00:00


Quote:

>I'm real new to this too, probably newer than you.  AeroTech makes an
>18mm "D" motor (D21 I think).  Don't know if it will fit in the same
>mount as the Estes 18mm motor, though.

Sure does.  So does the somewhat more powerful E25.

Quote:
>  I've got a SkyWinder that I'd
>like to try a "D" in.  Hopefully someone can answer that question for
>both of us.

It'll fit, but make sure you glue the front end on well, and
maybe increase the ejection venting.  As the AeroTech motors
have a somewhat "hotter" ejection charge, they're liable to
blow your nose cone halfway across the state.

--


Huntspatch, AL

 
 
 

Where To Find RMR FAQ and Other Newbie Questions

Post by Norman Heye » Sat, 27 Jul 1996 04:00:00



Quote:
> It'll fit, but make sure you glue the front end on well, and
> maybe increase the ejection venting.  As the AeroTech motors
> have a somewhat "hotter" ejection charge, they're liable to
> blow your nose cone halfway across the state.

One more thing to think about. The 'hotter' ejection charge has caused me
some problems as well. First, it seems to toast parachutes if I don't use
lots of wadding. More of a problem is that it tears the engine mount
tubes. Not from the forward thrust (use an engine block), but backwards
from the ejection. The Estes engine hooks with just the slit will tear
the Estes tubes when you use AeroTech engines. They need to be reinforced.

Later,
Norman


                             |   Even I don't know what I'm doing.