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undoctor
Joined: 21 Oct 2008
Posts: 212
Location: Bethelhem, PA
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 Posted: Wed Aug 22, 2012 11:03 am Post subject: BRS soft pack and gap seal conundrum |
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OK Kolbers,
Got one for you! Brother Don built an aluminum gap seal when he built
my FlagFly. I bought a BRS soft pack, which fits in the gap and takes
the shape of the wing from the leading edge back about 10". In order
for the rocket, which is behind the gap seal, to pull the 'chute from
the soft pack, which is beneath the gap seal, I cut some of the aluminum
that covered it and replaced it with Dacron, held down with Velcro. If
the circumstance arose that I needed to use it, the rocket would blast
off and drag the 'chute through the Dacron, which would give way due to
the Velcro.
Unfortunately, the hot sun has melted the glue on the Velcro and it's
pretty much a gooey mess any more, so I got a sheet of plexiglass to
make another gap seal, and bent it to fit, intending to attach it with
short bungies to the BRS frame. Although the rocket is behind the
plexiglass, the 'chute is beneath it. What I'm figuring on doing is
tracing the area of the plexiglass that needs to give if the 'chute is
pulled and cut it almost completely off, but leaving a few tabs of uncut
material, like two in front and one on each side at the very rear. If
the 'chute is pulled the nylon strap that attaches the ballistic
projectile from the rocket to the 'chute should break off the rear tabs
and when the "trapdoor" opens the front two tabs will either hinge or
break away, as well. Then I can drift slowly back to earth.
If anyone has another idea, or has done it a different way, I'd really
like to hear from you.
Dave Kulp
Bethlehem, PA
FireFly 11DMK
PS Another consideration is that the nylon strap may easily lift and
bend the gap seal from the rear and to simply use small gauge bungies to
hold it down. It would likely remain in place with nothing holding it
since the wind actually pushes the gap seal tighter into place, and all
the bungies would do is hold the back edge down so it doesn't vibrate or
flap in the wind. Another way might be to cut slots from side to side
at the front of the soft pack to make a hinge in case the whole gap seal
doesn't detach from the leading edge of the wing...
I'd like more minds to mull this over. Thanks.
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John Hauck
Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)
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| Posted: Wed Aug 22, 2012 1:47 pm Post subject: BRS soft pack and gap seal conundrum |
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<undoctor(at)ptd.net>
I'd like more minds to mull this over. Thanks.
David K/Kolbers:
BRS has some material called frangible hair cell plastic.
It is black, about 1/8" thick. I have been using it for my
parachute exit for the last 12 years. Had to replace the
original about two or three years ago.
The plastic is scored on the bottom side with a utility
knife where the rocket will strike and where the deployment
bag will exit the pack tray.
I used a piece of 1/8" 6061 plate to drop the rocket 5" so
it would be inside my gap seal. I built the last gap seal
out of aluminum sheet, cutting a hole in the top the same
size as the pack tray plus the rocket. The frangible
plastic is secured to the top of the top of the gap seal
with hardware store aluminum pop after a bead of silicone
seal is placed around the perimeter of the plastic.
Last I heard, the BRS soft pack repack time is extended from
2 to 10 years as long as the parachute is stored in a
weather tight compartment.
john h
mkIII
Sargents, Colorado
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John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama |
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byoungplumbing(at)gmail.c
Guest
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| Posted: Wed Aug 22, 2012 6:26 pm Post subject: BRS soft pack and gap seal conundrum |
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Got one for you! Brother Don built an aluminum gap seal when he built
my FlagFly. I bought a BRS soft pack, which fits in the gap and takes
the shape of the wing from the leading edge back about 10". In order
for the rocket, which is behind the gap seal, to pull the 'chute from
the soft pack, which is beneath the gap seal, I cut some of the aluminum
that covered it and replaced it with Dacron, held down with Velcro. If
the circumstance arose that I needed to use it, the rocket would blast
off and drag the 'chute through the Dacron, which would give way due to
the Velcro.
clean up the gooey mess and top it all off with polly fabric,,, the rocket will rip through the fabric and drag the chute behind it. then the paint can be continuous. no bungies, no water leaking through.
boyd young
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Vic Peters
Joined: 30 Oct 2009
Posts: 54
Location: Millinocket, Maine
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| Posted: Thu Aug 23, 2012 8:08 am Post subject: BRS soft pack and gap seal conundrum |
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Dave
They make velcro for high heat. One is called Dashboard. Google it
Vic
[quote] ---
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Vic
912ul Xtra
Maine
Too old to cut the mustard but not the cheese. |
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ceengland7(at)gmail.com
Guest
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| Posted: Thu Aug 23, 2012 11:43 am Post subject: BRS soft pack and gap seal conundrum |
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Or just buy some without adhesive, & attach it to the frame with epoxy & the fabric with thread (sewing machine).
Charlie
On 08/23/2012 07:34 AM, vic wrote: [quote] Dave
They make velcro for high heat. One is called Dashboard. Google it
Vic
[quote] ---
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Fred Kerfoot
Joined: 11 Jan 2006
Posts: 14
Location: Tampa, FL
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| Posted: Fri Aug 24, 2012 12:09 am Post subject: BRS soft pack and gap seal conundrum |
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Just replace the "stick-on" Velcro with "sew-on" Velcro. Sew half of the Velcro to the Dacron and attach the mating half to the aluminum with a good glue.
FredK
do not archive
[quote][b]
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Fred K
Do Not Archive |
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rickofudall
Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA
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| Posted: Fri Aug 24, 2012 9:19 am Post subject: BRS soft pack and gap seal conundrum |
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When designing any cover for a BRS please read the manual closely about what the rocket motor can and cannot do. Unless BRS has changed their manuals since the BRS 4 and 5 came out, one thing the rocket CANNOT do is penetrate even the lightest polyester covering material, i.e. 1.7 oz. "ultralight" fabric. While the rocket may be powerful after it has traveled a few feet, in the first few inches it is relatively weak. If you were around in the 60's you may recall the Gyrojet pistol and carbine. Its rocket propelled round could reach 1250 feet per second, but it you put your finger over the barrel you could stop the round from coming out.
However you design your enclosure or cover, please take advantage of BRS's offer to evaluate your installation and send them some pictures and an explanation of your design.
Rick Girard
do not archive
On Fri, Aug 24, 2012 at 3:06 AM, Fred K <fredkt46(at)hotmail.com (fredkt46(at)hotmail.com)> wrote:
| Quote: | Just replace the "stick-on" Velcro with "sew-on" Velcro. Sew half of the Velcro to the Dacron and attach the mating half to the aluminum with a good glue.
FredK
do not archive
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Zulu Delta
Mk IIIC
Thanks, Homer GBYM
It isn't necessary to have relatives in Kansas City in order to be unhappy.
- Groucho Marx
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