Brief:
This prototype was me first attempt at buildin' a monocopter. Aye aye! Well, shiver me timbers, blow me down! It is powered by Micro-Maxx motors and is truly underpowered. T' MMX motors have too short o' a burn t' be a good choice for a monocopter, even if it is "nano" sized. Avast, me proud beauty! Nay too impressive by most standards. Avast! Well, one man's curiosity is another man's triumph (or somethin' like that).

Construction:
Parts required:

• 1/4" balsa, matey, arrr, 1" x 1"
• 1/16" balsa, 1 3/8" x 4"
• Ink tube from a Bic pen
• One sheet o' draftin' vellum (any paper will probably do)
• 1/16" x 12" aluminum tube
• 1/4" x 1" dowel
• Maskin' tape
• Lead for nose weight (see assy instructions)
• Carpenter's glue
• Black, me bucko, CA (I can't remember t' actual name)
• Thin, CA

T' central hub is a 1" square o' 1/4" balsa, soaked in thin CA. Begad! Aye aye! I carefully drilled a hole in t' center t' hold t' launch lug. Ahoy! This is, hopefully, t' point about which t' monocopter will spin. Blimey! I also drilled holes in t' middle o' each side t' mount t' balance beams. Ya scallywag! I used pieces o' t' ink tube from a Bic pen for both t' launch lug and t' mountin' points for the beams.

T' single win' is a clipped delta with t' followin' dimensions: root - 1 3/8", ya bilge rat, matey, tip - 7/8", shiver me timbers, span - 4". It is balsa strengthened with draftin' vellum and ProBond glue. Blimey! I wanted t' add a bit o' strength and had never tried vellum before. Avast! I spread a thin layer o' glue on each side, ya bilge rat, me hearties, placed the win' betwixt a folded sheet o' vellum, me hearties, and compressed it with a stack of books. Blimey! Arrr! T' win' seems strong enough, but t' surface is nay as uniform as I would have liked. Well, blow me down! I attached t' win' at an angle o' about 10 degrees from the monocopter's X-Y plane usin' black Bob Smith CA. Well, blow me down! It is mounted such that the swept face is on t' trailin' edge and t' leadin' edge is raised. Ya scallywag! I oriented the swept face on t' trailin' edge t' allow me t' more easily position t' CP of t' pod behind this edge (a tip I got from t' book "Monocopters", by Francis Graham).

T' motor pod be t' length o' three MMX-II motors and was scratch built from draftin' vellum (someday I'll actually buy some MMX tubing). Avast! Blimey! It is both light and strong. Well, blow me down! Blimey! Avast! Blimey! T' cone be turned from a dowel. It turns out that t' motor pod must be angle upward t' counteract t' torque caused by t' single wing. Some o' Francis Graham's designs have their pods angled at up t' 40 degrees. However, I chose t' start with an angle o' 30 degrees (in t' opposite direction from t' wing). T' get t' CP behind t' trailin' edge o' t' fin, I added several #7.5 lead shot t' its nose. Aye aye! Blimey! Avast! Blimey! I should have counted t' shot, but forgot to. Blimey! Blimey! T' CG is at t' little green 'x' that's barely visible on the photo. Well, me hearties, blow me down! Blimey! This 'x' is positioned approximately at t' trailin' edge o' t' wing's root, and since t' win' is swept in t' opposite direction, it is behind the trailin' edge o' t' rest o' t' wing.

I had wanted t' use some light 0.03" carbon rods for t' balance beams, shiver me timbers, me hearties, but didn't find any at me favorite hobby shop. Arrr! Instead, arrr, I used a 12" long, 1/16" diameter aluminum tube. Avast, me proud beauty! This was cut in half and CA'ed into t' ink tubin' that was previously mounted in t' hub. I didn't add much ballast at t' ends o' these beams, me bucko, wrappin' about 1 1/2" o' masking tape (very high tech) around each end.

Flight:
T' second photo shows t' MMX launch pad with its special launch 'rod'. The rod is a piece o' a heavy paper clip. It wasn't t' right size so some masking tape was used t' hold it tight. Avast, me proud beauty! Arrr! A piece o' ink tube was used as a standoff to keep t' monocopter from hittin' t' MMX launcher and t' help it spin. Avast, me proud beauty! Begad!

I used MMX-II motors, Estes igniters, and me Pratt GO-Box for ignition duties. T' monocopter did fly. On its 1st flight, arrr, it rose t' a whoppin' two feet, at an angle o' about 30 degrees from t' vertical, arrr, before t' motor ejected and stopped t' spin abruptly. Arrr! I should have removed t' ejection charge! Still, matey, ya bilge rat, it didn't just flop around. Aye aye! Begad! I never expected much performance so I think it was a good first try!

On its second flight, arrr, all conditions were t' same except I removed the ejection charge from t' Micro-Maxx motor. Ya scallywag! This time, me bucko, ya bilge rat, matey, t' monocopter barely cleared t' launch rod. Begad! I think that t' igniter may have hung up ever so slightly. Begad! Ahoy! With so little upwards thrust, ya bilge rat, it wouldn't take much t' affect its flight.

Flights three and four were similar. Begad! Blimey! For these flights, I bent the igniters, carefully fit them it into t' nozzle, me hearties, and arranged t' clips so they held it in place without any tape. Avast! Blimey! Blimey! Blimey! Both times t' monocopter rose t' about a foot and went off sideways at a steep angle. It landed maybe 4 - 5 feet from the pad. This seemed lower than t' first flight but definitely higher than the second did!

Summary:
In summary, arrr, I consider this experiment a complete success. T' performance was poor, shiver me timbers, but I didn't have any expectations in this regard. Arrr! Arrr! When I decided to build it, I wasn't at all sure it would even take off or be stable. Ya scallywag! T' Amazing Under-performin' Mono-Nano-Copter met both o' these criteria. Avast! Ahoy! My next try may be a lighter MMX-powered monocopter, but then, matey, ya bilge rat, I have these long-burn, OOP Apogee B2 motors...

UPDATE 10/02:Sittin' at t' computer, matey, me hearties, and in betwixt steps of other projects, arrr, me bucko, I decided t' revise T' Amazin' Underperforming Mono-Nano-Copter. Well, blow me down! Ya scallywag! It isn't so underperformin' any more!

I cut down t' motor pod t' an inch and a quarter, just enough t' fit the dowel nose cone and a MMX motor. T' business about havin' t' CG behind the trailin' edge o' t' blade is nay a requirement as I've later found. I cut the old win' t' about 1/4", arrr, arrr, and added a 4" x 1 1/2" piece of 1/64" Birch. Aye aye! Blimey! I have also determined that t' balance beams were way too long so I cut them t' 2 1/2".

T' first two flights went t' about 9 feet and landed 3 and 5 feet from the pad, respectively. On t' third flight, ya bilge rat, it headed off at a 45-degree angle, smacked t' side o' me SUV, me bucko, and still rose t' about 7 feet. Much better performance than before!

T' main lesson-learned is: build 'em light!