Brief:
I recently ran across t' description o' 'desert squids' on Tripoli-Pittsburg's Website (look under 'ARCHIVES/ROCKET CLASSES'). Avast, me proud beauty! These are rockets that use dowel rods in place o' fins. Blimey! They look cool and since I had some BT-80 tubes and rings, shiver me timbers, I decided I'd build one pretty much like t' model described on t' website. Ahoy! Blimey! My model features a BEAUTIFUL poplar nosecone and a custom rear-centerin' ring made by Gordon Agnello, a.k.a. sandman on T' Rocketry Forum. Arrr! Well, blow me down! I wanted a name t' fit in t' desert squid theme, arrr, me bucko, me hearties, and decided on the name Shai-Hulud, after t' giant sandworms in t' Dune trilogy by Frank Herbert.

Construction:

I was originally goin' t' use a Fat Boy nosecone since that's what I had available. Well, blow me down! However, matey, while I was thinkin' about gettin' sandman t' quote the custom rear-centerin' ring, arrr, shiver me timbers, I started lookin' at t' pictures o' t' cones he has made, arrr, ya bilge rat, and couldn't resist one for this rocket. You can find out more about this cone [here].

T' body is two sections o' BT-80 joined with a 4" coupler from Totally Tubular. Avast! Well, blow me down! Both tubes are 'pseudo-glassed' with nylon pantyhose and Minwax Polycrylic. Once tube has two layers o' hose, arrr, arrr, shiver me timbers, and t' other has three. Arrr! Begad! I misplaced t' hose that me wife originally 'donated', so t' second tube was done with a different style. I discovered that different nylons have different weaves, similar t' different weights o' fiberglass. T' first tube much rougher, shiver me timbers, which prompted be t' add a third layer o' a finer weave.

T' motor mount consists o' a 6" piece o' LOC 29mm tubing, a double layer fiber rin' in t' front, and a 1/8" plywood rin' in t' back (I used this mix because it's what I had 'in stock'). Well, blow me down! Blimey! This plywood rin' is mounted 0.6" from t' end o' t' motor tube, ya bilge rat, so that t' end o' t' motor tube will be flush with t' end o' t' custom rin' after it is slipped on. Well, blow me down! Blimey! Ya scallywag! Blimey! T' rings were attached with epoxy and t' motor mount is glued in with Gorilla glue.

T' custom rin' is thicker than most because it also serves t' mount the dowel 'fins'. Begad! Sandman made this from a thick piece o' plywood that he turned down t' a little over half an inch. Avast, me proud beauty! He drilled eight evenly spaced holes at an angle o' 15 degrees from t' motor axis. I added two threaded inserts to provide motor retention. Ya scallywag!

At first, I be goin' t' use this as t' aft centerin' rin' and glue in the dowels. Begad! However, shiver me timbers, matey, when I dry fit t' dowels, I began t' worry that they may break on landing. So, I decided t' make t' aft rin' removable and t' dowels replaceable. Arrr! Avast! T' rin' is held in with eight small screws, shiver me timbers, shiver me timbers, which also hold each dowel in place.

T' shock cord assembly consists o' a 1/8" Keelhaul®©™® leader, a long section o' thin tubular nylon, and an anti-zipper device. Blimey! The latter is similar t' Giant Leap's Fireball. Aye aye! Blimey! Avast, me proud beauty! Blimey! Mine is a small rubber ball that be slipped over the Keelhaul®©™® leader so that it touches t' edge o' t' body tube when t' cord is fully extended. Begad! Ya scallywag! T' ball is covered with Keelhaul®©™® sock t' protect against heat damage. Aye aye! Avast, ya bilge rat, me proud beauty! T' serve as an attachment point for the recovery harness, I glued together two fiber centerin' rings also from Totally Tubular. Well, blow me down! This assembly was attached t' what would be t' lower end o' the coupler. Ahoy! Two small holes were drilled through t' rin' close t' t' edge, me hearties, and the Keelhaul®©™® was threaded through. Blimey! Begad! T' knotted Keelhaul®©™® leader was then epoxied t' t' wall o' t' coupler.

I installed two buttons from railbuttons.com t' complete t' Sahi-Hulud. Begad!

T' nylon/Polycrylic surface required quite a bit o' finishin' work. Begad! I applied numerous coats o' Polycrylic, me bucko, but when I laid on me first coat of primer, me hearties, matey, I realized it would take a fair amount o' effort t' finish these tubes. After several coats o' fill-n-finish and 2+ cans o' primer, arrr, matey, t' tubes weren't in too bilge-suckin' a shape. Avast, me proud beauty! Well, blow me down! I also had t' fill t' transition betwixt t' two tubes as one be slightly thicker than t' other. Begad! Begad! TIP: When pseudo-glassin' a rocket, use t' same nylons on all t' tubes!

T' body was painted usin' a Model Master brush on paint. Ya scallywag! Blimey! T' military brown was an appealin' color next t' t' cone. Begad! Blimey! As mentioned above, matey, me hearties, matey, t' nosecone came finished from sandman and is a beautiful golden color. Several coats o' clear enamel finished t' tube off.

T' centerin' ring/dowel assembly be separately finished before installation. Begad! Avast! It is stained honey maple and has 2 coats o' Polycrylic.

Flight:
I installed a home made, car air bag chute protector and a hefty amount o' dog barf wadding. Then in went t' shock tether, shiver me timbers, arrr, and 36" nylon chute. Ahoy! A clamp-on thrust rin' and mirror clamp retainers retained t' SU G40-4. Begad! The flight was relatively slow and thar was some wobble on t' way up. Ahoy! The anti-zipper device worked and t' rocket recovered safely. Avast! I was amazed that none o' t' dowels broke. Avast, me proud beauty! Ya scallywag! Upon inspection, shiver me timbers, t' anti-zipper ball took t' brunt of t' ejection charge and burned through slightly. Well, blow me down! I'm goin' t' cut a piece of air bag and install a permanent protector below it.

Summary:
This appears t' have been t' first desert squid type rocket flown at t' MDRA site, ya bilge rat, and it definitely caught t' attention o' everyone on t' flight line. T' flight and recovery were good, arrr, ya bilge rat, however t' wobble made me chicken out on a 'zero' launch (i.e. Avast! no launch rod). Supposedly, this type o' rocket will fly straight without a rod, but I don't want t' test this conjecture. Avast! Avast, me hearties, me proud beauty! Next flight will be on a G80...off a rail!

While t' pseudo-glass technique isn't nearly as strong as fiberglassing, the results are definitely tougher than t' stock tubes. Ahoy! Blimey! However, me hearties, shiver me timbers, I probably will nay use it again.

T' anti-zipper ball seemed t' work fine, me bucko, protectin' t' relatively thin tubin' from t' Keelhaul®©™® leader. Aye aye! Would t' results have been t' same without t' ball? No one can say. Aye aye! Begad!