Protecting Recovery Devices

Protecting Recovery Devices

Post by Brad » Thu, 27 Aug 1998 04:00:00



Ive been reading that since Estes Wadding is QUITE expensive for 75 sheets
 like 2-3 $ ) people use different methods for protecting their chutes,
streamers, ect. I have bought a big bail of Cellulose ( Sp? ) insulation
that is fire-proof and have heard of people using this. My question is how
well does it work and how much are you supposed to use? If you use too much
will it cause the ejection charge to not push the chutes out? How much would
you use for lets say 5 squares of wadding? Any help would be greatly
appreciated!

Brad

 
 
 

Protecting Recovery Devices

Post by John H. Cato, Jr » Fri, 28 Aug 1998 04:00:00


Quote:

> I have bought a big bail of Cellulose ( Sp? ) insulation
> that is fire-proof and have heard of people using this. My question
> is how well does it work and how much are you supposed to use? If you
> use too much will it cause the ejection charge to not push the chutes
> out? How much would you use for lets say 5 squares of wadding? Any
> help would be greatly appreciated!

Brad, generally wadding quantities are measured in 'body diameters'
worth -- i.e. 2 body diameters of wadding on a 1 inch rocket would be
about 2" -- which is not a bad number to work with.

Cellulose wadding is pretty loose - unlike Estes sheets -- and can
settle pretty easily -- but, worse, will sometimes allow flame to 'blow
by' and trash your chute anyway.

What I've found to be the best is a 'hybrid' approach -- using some
wadding AND some cellulose: form a 'cup' of 1 square of Estes and fill
with the cellulose, insert in rocket and then a little more to get up to
about 1 to 2 body diameters.  As extra insurance, taking another square
of Estes to wrap around your chute never hurts.  This way, you've only
used TWO sheets of the expensive stuff instead of 5 or 6 -- cutting your
costs here by 2/3.

-- john.

 
 
 

Protecting Recovery Devices

Post by Bob Kapl » Sat, 29 Aug 1998 04:00:00


Quote:

> Ive been reading that since Estes Wadding is QUITE expensive for 75 sheets
>  like 2-3 $ ) people use different methods for protecting their chutes,
> streamers, ect. I have bought a big bail of Cellulose ( Sp? ) insulation
> that is fire-proof and have heard of people using this. My question is how
> well does it work and how much are you supposed to use? If you use too much
> will it cause the ejection charge to not push the chutes out? How much would
> you use for lets say 5 squares of wadding? Any help would be greatly
> appreciated!

Dog Barf as I like to call it just isn't too suitlabe for small diameter
rockets. I'd save it for BT-60 and above. For smaller stuff get crepe paper
from the local party supply store. I used to grab the leftovers from
parties, take down the used stuf, and use that in rockets. Or find surplus
places that sell rolls or sheets real cheap.

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

Kaplow Klips:   http://members.aol.com/myhprcato/KaplowKlips.html
NIRA:           http://www.nira.chicago.il.us

 
 
 

Protecting Recovery Devices

Post by Tom Emerso » Sat, 29 Aug 1998 04:00:00




Quote:

> > I have bought a big bail of Cellulose ( Sp? ) insulation
> > that is fire-proof and have heard of people using this. My question
> > is how well does it work and how much are you supposed to use? ...

> What I've found to be the best is a 'hybrid' approach -- using some
> wadding AND some cellulose: form a 'cup' of 1 square of Estes and fill
> with the cellulose, insert in rocket and then a little more to get up to
> about 1 to 2 body diameters.  As extra insurance, taking another square
> of Estes to wrap around your chute never hurts.  This way, you've only
> used TWO sheets of the expensive stuff instead of 5 or 6 -- cutting your
> costs here by 2/3.

True -- the "synergistic" approach here is perhaps best, but if you want to
cut out the cost of the two squares you DO end up using [well, perhaps only
one as the top sheet isn't truly neccessary in this case, it just makes
things "cleaner"] stop at any supermarket on the way to the launch and buy
a head of cabbage or lettuce -- ABSOLUTELY "bio-degradable", REALLY cheap
[like, maybe, <$1 / day of flying -- ALL DAY!] and anything not used
becomes a side dish at dinner... :)

one "leaf" of lettuce or cabbage may even be the size of two or more
squares in the first place...

Tom

 
 
 

Protecting Recovery Devices

Post by Stretc » Sat, 29 Aug 1998 04:00:00



Quote:

> True -- the "synergistic" approach here is perhaps best, but if you want to
> cut out the cost of the two squares you DO end up using [well, perhaps only
> one as the top sheet isn't truly neccessary in this case, it just makes
> things "cleaner"] stop at any supermarket on the way to the launch and buy
> a head of cabbage or lettuce -- ABSOLUTELY "bio-degradable", REALLY cheap
> [like, maybe, <$1 / day of flying -- ALL DAY!] and anything not used
> becomes a side dish at dinner... :)

> one "leaf" of lettuce or cabbage may even be the size of two or more
> squares in the first place...

LOL!  Are you serious about this??  Have you tried it??

I use and reuse a square of cut out of an oven bag, tied to the shock cord.

--
STRETCH PHOTOGRAPHY
"Photographing People in their Environments
Throughout North America and the Entire World"
http://www.GoStretch.com

 
 
 

Protecting Recovery Devices

Post by Michael Toell » Sun, 30 Aug 1998 04:00:00


Quote:

>Ive been reading that since Estes Wadding is QUITE expensive for 75 sheets
> like 2-3 $ ) people use different methods for protecting their chutes,
>streamers, ect. I have bought a big bail of Cellulose ( Sp? ) insulation
>that is fire-proof and have heard of people using this. My question is how
>well does it work and how much are you supposed to use? If you use too much
>will it cause the ejection charge to not push the chutes out? How much
would
>you use for lets say 5 squares of wadding? Any help would be greatly
>appreciated!

>Brad

Use enough to fill the tube 1.5x - 2x the body tube diameter.  I find that
cellulose works really well in larger diameter rockets (greater than 1.5").

Mike Toelle

NAR 31692
TRA 3562 L1