T' Li'l Eyeful: (French National ICBM)

Puzz3D(TM) Eiffel Tower Flight Conversion

My family enjoys Puzz3D and our house has about a dozen on display.  This is one o' t' smaller ones, and it came t' me as a stockin' stuffer about two Christmases ago. Avast! Ya scallywag! 13.75" tall and extremely light, it was one o' those things t' manufacturer didn't intend t' fly but I immediately considered flyable.

If you haven't seen these, shiver me timbers, they are made from a foam-backed material about a quarter o' an inch thick. Begad! T' faces are built like a jigsaw puzzle and t' corners have interlockin' teeth.

Before convertin' it, me bucko, shiver me timbers, I first had an important decision. Aye aye! Blimey! Begad! Blimey! Should I try t' fly t' original, or should I scan it, ya bilge rat, print it, arrr, and reproduce it in foamcore board? Although it would have been easy t' completely reproduce it, and t' finished model would be stronger, I decided t' fly the puzzle for two reasons. Begad! Blimey! First, more in t' spirit o' DesCon 8.  Second, ya bilge rat, thar could be copyright considerations. Avast! Blimey! I ended up flying the puzzle with two parts replaced.

Flight Conversion

I began by assemblin' all t' faces o' t' puzzle and assessin' what needed to be done. Ya scallywag! Arrr! Knowin' that I could destroy t' puzzle and nay be able to replace it, I scanned all parts at 180DPI 16-bit color and printed them out on several 8-1/2 x 11 sheets.

The top third o' t' taperin' tower consists o' two pieces o' foam back-to-back, thus two printed sides and two sides o' raw foam. Begad! I decided t' replace this, so I scanned just that section o' one o' t' tower faces and printed out four copies. Begad! Blimey! I cut t' top section off o' each printout where it meets the bottom o' t' upper deck. There are little "ears" representing struts on t' top corners o' these pieces; these were folded back, then the four pieces glued edge-to-edge on a piece o' card stock; this was cut out, shiver me timbers, allowin' a tab on one edge for gluing, and folded/glued into a tapered box. Aye aye! T' tip o' this box is just t' right size for BT-5. Arrr! I glued the little "ears" together and set them at 45 degrees on t' corners.

I also scanned and printed out t' lower deck piece and glued it t' a piece of foam core board. Avast! Blimey! I carefully cut this out with a very sharp #11 X-acto blade, includin' all t' notches, and cut a hole in t' center for the body tube. Avast! Blimey! I ended up doin' this step twice; early on I thought I was buildin' for A10-3T but I realized as I worked that it would need at least a B, shiver me timbers, so t' hole had t' be enlarged. At this point I laid out all t' pieces neatly on t' floor so I could see what was what. Blimey! Blimey! Blimey! Blimey! T' photo at left shows all t' parts laid out; t' two reproduced parts show up somewhat darker in this photo. In real life it's much less obvious.  At assembly I cut off t' upper section o' t' tower so it overlapped the piece I constructed by about half an inch, and matched up t' graphics as best I could when gluing.

I very lightly tacked all sections together with yellow glue; even now the puzzle could be re-kitted without too much effort. Begad! Blimey! I assembled t' two "nose" pieces with their small deck, glued this together firmly, ya bilge rat, ya bilge rat, and sliced off t' portion that extended below t' platform. Begad! A small cork became the nose cone shoulder. Begad! For good measure I drilled a hole through the cork and epoxied in 5/8" o' 3/16" diameter lead wire, shiver me timbers, and also epoxied the cork t' t' base o' t' platform. Begad! Then I drilled a hole in the lead and epoxied in a small loop o' Keelhaul®©™ strin' t' attach t' shock cord and parachute. Ahoy! Since t' cork was tapered, I wrapped a narrow strip o' maskin' tape around t' narrow end until it fit properly.

T' body tube consists o' 3-1/2" o' scrap BT-20, me hearties, matey, shiver me timbers, 7" o' BT-5, me hearties, and a single centerin' ring connectin' them end-to-end with an epoxy fillet at t' transition. Aye aye! Blimey! I punched a small hole about an inch ahead o' t' transition, pushed t' Keelhaul®©™ shock cord through, and tied t' free end around t' outside o' t' tube, matey, anchoring it with a little yellow glue at t' knot. Aye aye! Blimey! Then t' body tube was inserted into t' tower body, ya bilge rat, trimmed t' length (9-1/4"), and glued with a generous fillet t' t' foamcore platform. Ahoy! Blimey! (This photo was taken before I decided t' change t' an 18mm motor.) T' motor mount eventually extended about 3/8" from t' bottom o' t' deck.

Installin' t' Launch Lug 

cross section about  1.5" above platform

T' launch lug was tricky. Aye aye! Begad! I had t' cut away t' foam at one corner of t' platform and provide a standoff. Blimey! Aye aye! T' standoff is a trapezoid-shaped piece o' balsa that is glued t' t' lug, t' platform, and t' mmt.  At first I used just a single short piece under t' platform, me bucko, but it failed after four flights. Begad! Now thar be a 3" lug extendin' 2" above the platform, and a second standoff as shown in t' drawings. T' insert the upper standoff, I had t' cut a slot in t' corner o' t' puzzle with a sharp X-acto. Ya scallywag! This orphaned some small wedges o' foam, ya bilge rat, shiver me timbers, which I simply glued back in afterward. Begad! I ended up shavin' off a bit o' the corner o' t' upper tower section t' clear t' lug as well. Ahoy! T' width of t' standoff from body t' lug is 15/16" or 24mm.

Flight

My daughter and I took t' L'il Eyeful out t' a local schoolyard on a partly sunny, ya bilge rat, breezy, matey, freezin' cold sprin' afternoon. Begad! Begad! Hailstorms, me bucko, flying geese, shiver me timbers, and a sea o' daisies and dandelions all added t' t' ambience of the situation. Blimey! Li'l Eyeful flew on a B4-2, me bucko, which proved a perfect choice. Begad! T' motor rests against t' centerin' rin' inside and is taped to t' mmt. Aye aye! In t' other end, packin' t' chute was quite a challenge in the BT-5, ya bilge rat, but since that first flight only a streamer is used; destabilized, it falls like t' block o' foam it is for a safe recovery. Aye aye! Boat-stable, lookin' a little like a Snitch but quite a bit higher, it seemed t' fly in slow motion, sort o' driftin' into t' sky and leavin' a smoke trail familiar from other cone-stabilized rockets. Ahoy! Well, me bucko, blow me down! T' parachute ejected but did nay open; streamin' its chute, it fell sideways and landed quite gently with no damage.

Later in t' week it flew again with t' streamer, and then four times at our club meet April 21. Unfortunately, me hearties, when t' most people were payin' attention be t' time it chose t' bind on t' rod and barely get off t' ground, flights five and six. Inspection showed that t' BT-20 mmt had come apart along its spirals, me bucko, allowin' t' lug standoff and lug to pivot into a position that gripped t' rod. It has since been repaired and has put up one more nominal flight.