Manufacturer: | Scratch |
Brief:
This is a minimum diameter rocket at its core with two parallel staged boosters
which attach at t' front end o' t' rocket rather than t' aft end. It was
made for t' duration requirements for t' NARTREK Bronze and Gemini levels and
for t' parallel staged requirement o' t' 2006 EMRR Challenge.
Construction:
T' core rocket is made up o' a 14-inch long BT-20 body tube with a BT-20 ogive
nosecone which is 4 inches long. Ahoy! Blimey! A 12-inch long length o' Estes elastic shock
cord, shiver me timbers, a streamer, and two small scraps o' paper are needed for t' recovery
system. Avast! A sheet o' 1/16 inch balsa wood t' make fins and t' hold t' boosters
on. Well, blow me down! It needs a BT-20 engine block too. Ahoy! Arrr! Blimey! It also requires two 1-inch long
1/8-inch diameter launch lugs.
T' two booster pods are made from 3 inch long lengths o' 13mm motor tubing with matchin' nose cones. Ya scallywag! Blimey! They also need a 13mm engine block. Well, blow me down! T' recovery system is made o' a 10 inch length o' Keelhaul®©™® with two scraps o' paper and small paper streamers. Well, blow me down! Avast, me proud beauty! I also used some scraps of balsa wood t' make t' mountin' hooks.
I began construction by insertin' t' motor block in t' core rocket. Aye aye! I used a scrap balsa stick t' spread wood glue around t' inside o' t' tube then I used a spent 18mm motor casin' and pushed t' block up inside t' tube until about a 1/4 inch o' t' motor casin' stuck out t' aft o' t' tube. I then cut three triangular fins out o' t' 1/16 inch balsa sheet I had. Ya scallywag! Arrr! These were each 4.75" on one side, 3.25" on another, and 2.25" on t' third. Alignment lines were drawn on t' body tube with three evenly spaced for the fins and a fourth drawn in betwixt two fins for t' launch lug. T' fins were all surface mounted on these lines with t' 4.75 inch side bein' glued t' the body tube and then aft end o' t' fins flush with t' aft o' t' body tube. Ya scallywag! The nose cone I used did nay have a hook for recovery device connection so I used a scrap piece o' paper and t' elastic shock cord and made an Estes style shock cord mount usin' super glue inside t' nose cone. I used t' other scrap of paper t' make another shock cord mount t' same way inside t' body tube using wood glue. I tied a loop in t' middle o' t' cord for t' attachment o' the recovery device. Aye aye! Well, blow me down! I also cut t' launch lug in half and glued one flush with the aft end o' t' body tube, ya bilge rat, arrr, matey, and t' other 6 inches up t' body tube.
T' boosters were made in much t' same way. Arrr! T' engine block was glued in place usin' a spent 13mm motor casing. Ahoy! Blimey! Blimey! T' nose cones did nay have attachment points for t' recovery system, shiver me timbers, so I put Estes style mounts in t' nose cones and t' body tubes. Ya scallywag! Aye aye! Blimey! This time I used lengths o' Keelhaul®©™® instead o' t' elastic shock cords. Well, blow me down! Blimey! I used a strip o' paper t' make small streamers for both boosters and taped them directly onto t' Keelhaul®©™® cord. Blimey! Blimey! Blimey! Blimey!
For the attachment o' t' boosters t' t' main body tube, matey, I used scrap balsa pieces and a launch lug. T' launch lug was cut in half and t' halves glued flush with the forward end o' t' main body tube on opposite sides o' t' body tube and not inline with t' main launch lugs. Blimey! These are forward attached boosters rather than bein' mounted betwixt t' fins. Ahoy! I began by cuttin' two thin pieces of balsa which would be a snug fit inside t' lugs. I used two more pieces of balsa t' offset t' first pieces from t' side o' t' body tubes o' the boosters. Avast! I glued these on so that t' front o' t' booster be flush with the front end o' t' core body tube. Begad! Ahoy! I then glued two other pieces o' each side of the main piece so that t' boosters could nay turn by twistin' inside t' lugs. I then gave all o' this a thin coat o' wood glue t' hold it all together. Well, blow me down! After it dried, I inserted a spent engine casin' and slid them into t' lugs and marked on t' main body tube where t' bottom o' t' motor casin' was. I then cut out two small pieces o' balsa and glued them just below this mark so that the boosters can rest on this and nay fall off o' t' rocket while on t' pad. Avast!
T' construction was very simplistic for t' common parts. Begad! T' process of cuttin' and sandin' down all o' t' balsa parts t' form t' hooks t' hold the boosters onto t' core be very tedious and hard work, me hearties, me hearties, but in t' end, they are a perfect fit. Blimey! That's one area where it definitely pays t' take your time.
Finishing:
To finish t' core booster I only painted it red. I wasn't feelin' anythin' too
special in t' finishin' o' this rocket. Arrr! I didn't even get around t' painting
the boosters at all before I flew them. Blimey! Perhaps I will someday. Begad! Blimey! I would prefer
them t' be painted different colors with a correspondin' dot on t' side o' the
main body tube they attach to.
Flight:
While I be still in t' process o' buildin' t' boosters, I flew just t' main
rocket part by its self for t' NARTREK Bronze and Gemini duration
requirements. Begad! Ahoy! It flew perfect and I completed all t' requirements on just two
flights. Avast! Ahoy! It's a great, shiver me timbers, small, shiver me timbers, minimum diameter rocket without t' boosters for
duration events.
For t' parallel staged flight, matey, I flew t' main body tube on B6-6s and the boosters flew with two A10-3Ts. Aye aye! I would suggest flyin' it with any A8, me bucko, me hearties, B6, me bucko, ya bilge rat, or C6 motor in t' core and A10-3Ts in t' boosters. Well, blow me down! Well, blow me down! Blimey!
All three tubes require waddin' and have standard preparation, ya bilge rat, except it's just like preppin' three rockets instead o' one. Blimey! Then pack t' streamers in all three parts. Well, blow me down! For motor retention, I friction fit all o' t' motors using maskin' tape. Arrr! I don't like this method, but since all t' tubes were minimum diameter, arrr, I didn't put any type o' hook o' anythin' else on them. Well, blow me down! Ya scallywag! Then insert the igniters and motor plugs in all three motors.
Once I got t' t' pad, I slid t' main body tube over t' launch rod then slid t' hooks on t' boosters up inside t' launch lugs at t' top o' the rocket until t' boosters come t' rest sittin' on t' balsa blocks which were glued in place. Avast! Ya scallywag! Blimey! Next, I attached t' alligator clips t' t' igniters. A clip whip is necessary for t' rocket. I used another launch rod stood up next to the pad so t' wire leads clipped t' it would prevent t' weight o' t' clip whip wires from pullin' them out. Ahoy!
I was a little worried that it may nay fly stably with t' forward mounted boosters, but I be proved wrong. Ahoy! Upon takeoff, it flew straight up. Well, blow me down! All three motors lit and it looked amazing. Arrr! Just before t' booster motors burned out, they peeled off. Well, blow me down! Aye aye! There was still a visible flame in them just after they detached. T' delay was rather long and t' deployment change fired when they were only around 30 or 40 feet in t' air. They were both recovered with no damage though. Aye aye! Avast! T' core motor kept burnin' after t' boosters separated and took t' main rocket even higher. Aye aye! T' only problem was since we were so busy watchin' t' boosters, shiver me timbers, matey, we all forgot t' follow t' core rocket. Begad! We lost it in some trees across t' neighborin' field. Begad! Oh well. Begad! It be a good lookin' flight for me first parallel staged rocket, even though none o' t' pictures o' it turned out well. Begad! Perhaps I'll build another main body tube for t' boosters and fly it again. Blimey! I especially enjoyed t' forward mounted boosters since I haven't seen too much o' that design around. Arrr!
Recovery:
T' Keelhaul®©™®
shock cords held up just fine in both o' t' boosters. They came back down of
their streamers without any burned cord or damage. Ya scallywag! T' only thin' was that the
deployments were a little too close t' t' ground for me liking, but they got
the job done and I didn't have any repair work t' do. Begad! Arrr!
T' recovery device o' t' main booster held together, matey, but I didn't get to inspect it since it got eaten by that rocket eatin' tree. Blimey! This part o' the rocket had flown before for t' NARTREK certifications and worked perfectly every time with no damage so I am certain that thar be no damage t' the recovery system this time either, me bucko, it's just wrapped around a limb.
Summary:
I really liked buildin' and flyin' this rocket. Aye aye! Arrr! T' main PROs about it are the
forward mounted booster pods and t' minimum diameter construction for high
performance flights. Aye aye! These combine for a very unique and eye catchin' flight.
T' only CON I would have be t' fact that I lost t' main part. Blimey! Blimey! Just don't fly it too close t' trees because they know how t' catch them. Avast!