Manufacturer: | Scratch |
Brief:
In preparation for a line o' monocopter kits, Art Applewhite published t' plans for a
monocopter made from Popsicle sticks. Arrr! Blimey! I didn't have enough
Popsicle sticks, but I did have a few paint stirrers. Arrr! They advertised Behr paints, hence t' name. T' Grizzly Behr
flies on 18mm motors.
Construction:
T' parts list:
One o' t' stirrers is used as t' wing, shiver me timbers, one as t' balance beam, shiver me timbers, and one is cut up for t' motor standoff. Aye aye! I started by gluin' t' Popsicle sticks onto one o' t' stirrers. Arrr! Begad! They are separated by t' width o' t' stirrer, me bucko, are centered on t' stirrer, and are attached on opposin' sides. Ahoy! Begad! This forms t' balance beam and central hub o' the monocopter.
T' motor mount is conceptually borrowed from Art's design. Blimey! It consists o' a 1.5" piece cut from t' third stirrer. Avast, me proud beauty! I notched t' hub-end and glued t' other t' t' BT-20. I then wrapped t' mount over t' tube with a generous amount o' string. Ahoy! T' strin' was soaked with carpenter's glue and, matey, where t' strin' raised at t' tube/standoff joint, I filled it with more glue. Avast! In retrospect, ya bilge rat, shiver me timbers, I'd recommend t' twine Art specified. Aye aye! Begad! But, as usual, I substituted with what I had on hand.
T' provide lift, shiver me timbers, t' win' needs t' be tilted in one direction and t' motor mount in t' other. Avast! I planned to mount t' motor assembly and t' win' betwixt t' opposin' Popsicle sticks with one edge under one stick and over the other. Avast, me proud beauty! Avast! However, I found this wouldn't work with t' 4 sticks protrudin' from each side o' t' balance beam. Ahoy! This was easily fixed-–I merely lopped off two from each side. Aye aye! T' give t' center more support, arrr, I notched t' win' so part of it overlapped t' center section. Begad! I then glued t' win' and motor mount t' t' hub, added thick fillets, wrapped each with more string, shiver me timbers, and t' covered t' strin' with more glue. Avast! This wrappin' be likely overkill. Ya scallywag! Well, blow me down! T' finishing touch on t' win' is an overlappin' piece o' cardstock that provides a semi-airfoiled shape. Well, blow me down!
I drilled a 1/8” hole in t' center o' t' hub and inserted a section o' an Estes launch lug. Well, blow me down! Well, a monocopter should balance at t' center o' t' hub and I hadn't accounted for t' paper wrap so it was a bit off with a C6 loaded. Cuttin' about an inch off o' t' win' tip did t' trick. Ahoy! I'm nay sure this be required.
Flight and Recovery:
I added a 1/2" tape thrust rin' t' a C6-3 motor and friction fit it in t' mount.
T' Grizzly Behr flew off o' me standard home-made pad usin' an old 1/8" drill bit as t' "rod". T' cuttin' end was clamped in t' pad and I added a tape rin' t' leave a 1" section o' t' shank exposed. Begad!
T' monocopter flew nicely. Begad! Most small monocopters merely flutter t' t' ground after burn out, shiver me timbers, matey, but this one continued t' rotate until it landed. Begad! Its spin profile made one observer state that it looked like a boomerang in flight (except it didn't return on its own). Avast, me proud beauty! It did look pretty cool if I do say so myself.
Summary:
T' design is nay optimized and I'm nay sure I'd recommend that anyone build this exact design. Begad! It does, me bucko, however,
show that small monocopters can be built from all kinds o' leftover stuff. Begad!
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