Brief:
Shorter body, me bucko, Carbon Fibre/Keelhaul®©™ re-enforced airframe, matey, piston ejection system, extra centerin' ring, arrr, all thread reinforcement round central electronics bay. Replaced recovery shock cord with tubular nylon and replaced motor mount with PML phenolic motor mount tube.

Modifications:
This would have been an easy kit t' build from stock as it came with easy to read instructions and contained easy t' build parts. Havin' said that, ya bilge rat, I promptly put t' instructions in a drawer and begin me kit-bash in earnest. As always I measured t' components and entered t' data into RockSim. Begad! I also had an extra body tube which was slightly shorter and by mistake used this tube instead o' t' original tube (hence me rocket is slightly shorter than the kit). Aye aye! Usin' RockSim I wanted t' design somethin' which be a little different than t' usual single deployment ‘blobbo’ rockets. With this in mind I decided t' have a central piston which would span t' length o' t' rocket and create a void which I could use for an electronics bay. Avast, me proud beauty! Arrr! T' achieve this I needed extra centerin' rings t' fit t' motor mount and t' piston tube (a piece o' 2.5" PML QT). Well, shiver me timbers, blow me down! A forward centerin' rin' would be removable and allow for t' placement o' electronics in t' void created by t' piston. Ya scallywag! The forward centerin' rin' is held in place by t' all thread rods which have carbon fiber sleaves with washers t' create shelf for t' centerin' rin' t' sit on (see picture 2). Well, blow me down! I drilled a very small hole in t' base o' t' piston tube which allowed for some air t' pass down below t' electronics bay and keep a vacuum from formin' inside t' piston. Arrr! Ahoy!

T' fins were mounted in t' usual way with extra strips o' carbon fiber and Keelhaul®©™® as re-enforcement.

T' airframe be vacuum bagged usin' me trusty foodsaver and some carbon fiber/Keelhaul®©™® weaved cloth. Ya scallywag! Blimey! A further sandin' veil o' fibreglass was applied once t' first layer was 1/2 cured. T' result was an airframe which is rock solid. Begad! Blimey! T' body tube be slotted all t' way down so I could mount t' entire motor and piston assembly in one step. Well, blow me down! Once mounted onto t' airframe external fillets were created with resin and silica filler. After this had all dried t' rocket was almost done.

After measurin' t' center o' gravity against t' CP in RockSim I decided how much weight t' add. Well, blow me down! Begad! In t' end I used 1.5lbs o' lead along with t' weight of t' hardware and forward bulkhead plus enough resin t' seal it all side the nose cone. Aye aye! This left about 3/4 o' t' nose cone as extra room for t' parachute and shock cord (i.e. Avast! I didn't have t' stuff all o' this into t' piston tube). Begad!

I was now ready t' finish it.

Construction:

• 1 body tube made from thick kraft paper
• 3 fins o' G10 fibreglass
• 2 plywood centerin' rings for a 54mm motor mount
• 1 10" 54mm motor mount
• 1 heavy elastic shock cord
• 1 plastic nose cone
• 1 nylon parachute
• 2 quick links
• 1 launch lug
• Instructions...
• Schematic (Click Here)

Construction (PROS):
T' extra room a 5.5" airframe gives makes this an easy kit t' build from stock. Blimey! For me sins t' modifications I made took a while as they were somewhat involved. Ahoy! Ya scallywag! From stock t' kit is complete so no complaints there. Ya scallywag! Arrr! Since this is a mod I ignored all instructions and replaced parts as needed.

Construction (CONS):
T' body tube did nay come slotted which isn’t a real big problem but does make for extra work. Begad! Blimey!

Finishin' (PROS):
In keepin' with t' idea o' tryin' somethin' different with this rocket I decided t' use a ‘Monocoat’ finish. This was me first attempt at usin' a Monocoat iron-on finish. After some testin' with t' iron and some samples I decided upon a sky blue airframe with a black and white check trim (a Z-car effect). Ahoy! I had Scott Binder print up some new decals (as I plannin' to ultimately launch this on a K550). Blimey! Its new name was t' be K-Blobbo. Well, blow me down! As you can see in t' picture t' results were nay too bad (see picture 1). Aye aye!

Finishin' (CONS):
As t' Monocoat isn’t supposed t' be applied over a prepared surface this meant that I could nay use a filler primer (UV Smooth Prime) t' create a nice even surface for t' Monocoat t' cover. Hence thar are surface ripples from the composite coverin' showing. Blimey! Ahoy! I may have a go at finishin' t' composite layer then tryin' t' apply t' Monocoat again.

Flight:
This kit is suppose t' be t' Kin' o' Blobbos and recommends I and J motors. I had a couple o' J’s left so first off be a long burnin' J185 Blue Thunder which lifted off t' pad very nicely and burned and burned. T' parachute deployed on time but t' surface drag from t' rocket was such that t' delay I choose be wrong and too long. Begad! Blimey! However, t' solid build o' t' airframe meant that even a late and high speed deployment be no problem. Well, blow me down! Blimey! Begad! Blimey! T' rocket came down fairly close and all was well. Ya scallywag! Blimey! A video o' t' launch detected a slight wobble which t' me meant that I was just too close t' t' center o' pressure so more nose weight be goin' t' be needed.

After another 1/2lb o' nose weight I launched it on a J275 White Lightening. Avast, arrr, me proud beauty! This time thar was no wobble and I put in an RDAS in the electronics bay t' ensure deployment at apogee. Avast, me proud beauty! All went t' plan and t' rocket landed safely nearby. Well, blow me down! T' altitude reached as 1000 feet lower than Rocksim predicted (lots o' drag).

A third launch was performed usin' a Cessaroni Pro38 6 grain (international version) J360 (800ns). Ahoy! Avast, me hearties, me proud beauty! 3. Blimey! 2. Begad! 1. launch and up it went t' 2500 feet with the RDAS ensurin' deployment at apogee. Begad! Begad! Analysis o' t' data indicated that a 10 second motor ejection delay is ideal for this rocket.

I have since launched this a fourth time on a J360 Pro38 with only motor ejection and it flew as planned with t' 10 second delay providin' t' correct delay for an apogee deployment.

Summary:
A nice rocket with t' internal piston makin' for easy prep. T' electronics bay ’round t' piston is really handy and allows for a greater range of motors.

Other:
As always build it like an M and you won’t need t' build it again when it crashes.