Brief:
This prototype was me first attempt at buildin' a monocopter. Arrr! 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. Ahoy! Nay too impressive by most standards. Arrr! Well, me hearties, one man's curiosity is another man's triumph (or somethin' like that).

Construction:
Parts required:

• 1/4" balsa, 1" x 1"
• 1/16" balsa, me hearties, 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 hearties, 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. Blimey! Blimey! I carefully drilled a hole in t' center t' hold t' launch lug. This is, hopefully, t' point about which t' monocopter will spin. Arrr! Blimey! I also drilled holes in t' middle o' each side t' mount t' balance beams. Aye aye! Blimey! 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", tip - 7/8", arrr, span - 4". Ya scallywag! It is balsa strengthened with draftin' vellum and ProBond glue. Arrr! 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, shiver me timbers, me hearties, ya bilge rat, placed the win' betwixt a folded sheet o' vellum, matey, and compressed it with a stack of books. Begad! Well, blow me down! T' win' seems strong enough, shiver me timbers, but t' surface is nay as uniform as I would have liked. Blimey! Aye aye! I attached t' win' at an angle o' about 10 degrees from the monocopter's X-Y plane usin' black Bob Smith CA. Arrr! 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 be scratch built from draftin' vellum (someday I'll actually buy some MMX tubing). Ahoy! Avast! Blimey! It is both light and strong. Ahoy! 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). Begad! T' get t' CP behind t' trailin' edge o' t' fin, me hearties, I added several #7.5 lead shot t' its nose. Blimey! Begad! Blimey! I should have counted t' shot, shiver me timbers, but forgot to. Arrr! Begad! Blimey! T' CG is at t' little green 'x' that's barely visible on the photo. Ya scallywag! Arrr! Blimey! This 'x' is positioned approximately at t' trailin' edge o' t' wing's root, arrr, 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, but didn't find any at me favorite hobby shop. Blimey! Avast! Instead, I used a 12" long, arrr, 1/16" diameter aluminum tube. Avast! Blimey! This was cut in half and CA'ed into t' ink tubin' that was previously mounted in t' hub. Avast! I didn't add much ballast at t' ends o' these beams, 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'. Avast! The rod is a piece o' a heavy paper clip. Well, blow me down! Begad! It wasn't t' right size so some masking tape be used t' hold it tight. Well, blow me down! Blimey! A piece o' ink tube was used as a standoff to keep t' monocopter from hittin' t' MMX launcher and t' help it spin. Arrr!

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

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

Flights three and four were similar. Begad! Avast, shiver me timbers, me proud beauty! For these flights, arrr, I bent the igniters, shiver me timbers, carefully fit them it into t' nozzle, and arranged t' clips so they held it in place without any tape. Avast, me proud beauty! 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. Aye aye! This seemed lower than t' first flight but definitely higher than the second did!

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

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

I cut down t' motor pod t' an inch and a quarter, matey, just enough t' fit the dowel nose cone and a MMX motor. Aye aye! Blimey! T' business about havin' t' CG behind the trailin' edge o' t' blade is nay a requirement as I've later found. Begad! Blimey! I cut the old win' t' about 1/4", and added a 4" x 1 1/2" piece of 1/64" Birch. Well, blow me down! 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, me bucko, respectively. Ya scallywag! On t' third flight, it headed off at a 45-degree angle, smacked t' side o' me SUV, matey, and still rose t' about 7 feet. Much better performance than before!

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