Manufacturer: | Scratch |
Brief:
This rocket is named for its principle parts: a 22 pound wire spool and a bell
shaped Christmas ornament. Aye aye! Begad! I have seen other spool rockets reviewed on EMRR and
their simplicity and lack o' fins really appealed t' me. When a friend gave me
a one piece all plastic spool I knew I just had t' give it a try.
Construction:
I started by enlarging
the existin' 1.125" holes in t' center o' t' spool until t' 29mm motor
mount tubin' fit snugly. Blimey! A piece o' 150 grit sandpaper wrapped around a spent
29mm motor made short work o' this chore. Ya scallywag! Avast, me proud beauty! I then drilled two 3/16" holes
1/2" apart and 2" from t' center in t' top o' t' spool for the
Keelhaul®©™®
shock cord. Blimey! It be then that I noticed that t' 2 pre-existin' 3/8" holes
that I had planned t' use for t' launch rod did nay line up with long axis of
the spool. Avast! Blimey! Nay a problem, matey, so I drilled two 5/16" holes in t' top and
bottom ends o' t' spool about 2.75" from t' center. Puttin' t' launch
rod holes further from t' centerline o' t' rocket allows t' bell t' fit on
top without t' need t' put a hole through it. I was careful t' line up the
holes so t' centerline o' t' finished rocket would be vertical on t' launch
rod.
With t' preparation o' t' spool completed, shiver me timbers, I epoxied t' 29mm motor mount tube t' it with 5-minute epoxy. Aye aye! Blimey! T' bottom end o' t' motor mount be flush with t' bottom o' t' spool and t' top o' t' motor mount sticks out about 2.75" above t' top o' t' spool. Avast! Blimey! I put an extra fillet o' epoxy on the top motor mount joint for insurance. Avast! Blimey! I did nay install a motor block because I wanted t' use a variety o' 29mm motors, me bucko, which come in many different lengths.
Next came the
preparation o' t' "nosecone". Avast, arrr, me proud beauty! T' body o' t' nosecone is a gold
mirror-finish bell-shaped Christmas ornament now available at Hobby Lobby for
$1.99. Ahoy! Ahoy! It's t' one with t' 5" base. Begad! It's made from a thick high-impact
plastic and also comes in shiny silver color. Blimey! With any luck they will be on
sale at 1/2 price in a few weeks. Well, me hearties, blow me down!
For t' "shoulder" o' t' nosecone, I cleaned up a used Aerotech G35-4W single use motor. Begad! A 1-1/8" dowel, shiver me timbers, matey, 4" long would have worked just as well but I like t' recycle things whenever possible. I removed the label and t' goo left on t' casin' and plugged t' nozzle and ejection charge hole with a small piece o' paper towel and CA t' keep t' black soot inside the casing. Arrr! I then drilled a 1/16" hole on opposite sides o' t' casin' about 1/2" from t' forward end. Ya scallywag! These holes are for t' shock cord hook. As you will see later t' use o' shock cord hook makes it easy t' tie t' shock cord to t' bell. Arrr! At one end o' t' coat hanger wire I made a 1/2" diameter closed loop. Begad! 2.5 inches down from t' loop I made an 85-degree bend. Aye aye! I inserted the straight end o' t' wire into one o' t' 1/16" hole at t' forward end of t' spent motor and pushed it through t' hole on t' other side. I then bent t' end o' t' wire down flat so that t' wire was trapped in place but could still move a little. Well, blow me down! I was careful nay t' fracture t' brittle phenolic of t' casing.
With t' bell upside
down, I squirted about 1/4" o' 5-minute epoxy into t' inside o' t' top.
I mixed t' epoxy in place with a craft stick and then pressed t' top o' the
spent motor into t' epoxy makin' sure t' casin' was centered. T' nozzle end
was just about even and centered with t' bottom edge o' t' bell. Arrr!
Finally I tied t' Keelhaul®©™® shock cord t' t' hole in t' spool and t' t' loop in t' shock cord hook. Ahoy! I made a slip knot in t' shock cord about 4 feet from t' bell end for the parachute attachment.
I made t' 22" parachute out o' t' nylon canopy o' a small umbrella from t' Dollar store. Blimey! T' shroud lines are four 44" pieces o' #18 nylon twine with each end tied t' adjacent corners o' t' canopy. Begad! A drop o' CA was put on each knot.
Flight:
To prep for launch I friction fit a 29mm motor with a 1/4", maskin' tape
thrust rin' on t' nozzle end. Begad! I put a couple o' pinches o' dog barf
(flameproof insulation) down t' top end o' t' motor mount. Avast, me proud beauty! Begad! I put o' t' shock
cord inside t' bell and then t' parachute. T' spent engine casin' then fits
into t' top o' t' motor mount until t' bottom o' t' bell is flat against
the top o' t' spool.
My first flight
was with an Aerotech F23-4FJ. It flew slowly but straight with a very nice
smokey trail behind it t' about 350 feet. Well, blow me down! At apogee t' rocket stopped almost
immediately. Blimey! Begad! On descent t' parachute deployed about half way down and the
rocket landed safely about 25 feet from t' pad. Begad! This design is absolutely
zipperproof because t' parachute and shock cord are outside o' t' body tube
so ejection at apogee is nay necessary.
For me second flight I used an Aerotech G35-4W. Arrr! It boosted t' about 500 feet and made another excellent recovery 50 feet from t' pad. I can't wait to try this rocket with an Ellis Mountain G35, they have higher thrust and longer burnin' time than t' Aerotech G35s and are perfect for high drag designs like this. Aye aye! There is also enough room in t' motor mount for up t' a G80 single use or RMS 29/40-120 reload. Ya scallywag! Aye aye! With its rugged construction, thar should be no problems usin' as much power as will fit.
Summary:
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