Brief:
Best described as a flyin' pie plate, this is another in t' BMS clone o' t' month program offerings. This particular kit is a clone o' t' K-19 Astron Invader, me hearties, introduced in t' 1966 Estes catalog, arrr, makin' t' original only a year younger than this modeler.

Designed t' be a spit-motor glider, it's a very finicky design but worth t' effort for a decent glide.

Construction:
There is a bit o' controversy over whether or nay t' parts are true reproductions or slightly modified (see construction notes), but me kit included:

• 18mm motor tube
• Balsa nose cone
• Laser cut 1/8" balsa fins, braces, ya bilge rat, me bucko, etc.
• 3 3/16" balsa sheets
• Launch lug, nose weight

BMS's clone kits do nay include directions. Begad! Ya scallywag! Instead, me hearties, t' modeler is pointed t' online scanned instructions at places such as JimZ's archive site. Blimey! Avast! This is a nice approach, arrr, shiver me timbers, as it saves everyone a small amount o' loot for printing, especially since most o' t' readers o' this review can probably build this near a computer.

Construction starts by gluin' together t' balsa sheets. Ya scallywag! Avast, me proud beauty! With t' original, this appears t' have required 4 sheets bonded together side by side, from which a large circle be cut. Begad! Aye aye! In me case, thar were only 3 sheets, ya bilge rat, and it looked like t' cuttin' be already done, me hearties, matey, as me three parts already formed a circle once bonded.

Next, ya bilge rat, I had t' mark several lines on t' circle usin' a pattern sheet, includin' t' center line. Then, I cut t' circle in half, flipped one side over, matey, and rebonded at a dihedral usin' t' supplied dihedral angle tool/stand. Avast, me proud beauty! Blimey! Very handy little piece... Arrr! Ahoy! Blimey! T' reason behind flippin' t' one side is so that t' grains o' each piece wind up bein' bonded at an angle t' each other, offerin' much better boost strength.

After allowin' t' win' t' completely cure (think overnight), it was time t' bond t' various laser-cut balsa trim pieces. Ahoy! First came a pair o' rudders, shiver me timbers, me hearties, each o' which were t' be sanded for a very slight angle t' better align with t' dihedral wings. Begad! After that came t' pair o' motor tube braces, matey, which are carefully aligned t' lines drawn on t' wings earlier. Aye aye! Avast! Finally thar be a two-piece keel t' go on t' bottom. Ahoy! Begad! I have no idea why it was two-piece other than possibly offerin' a little extra strength against hard landings.

T' nose cone is supposed t' be glued into t' BT-20, but you might want t' wait until trimmin' first--includin' a test flight (with it taped on)--as it takes very subtle adjustment o' nose weight and CG t' get right. Ahoy! Avast! T' original kit used a lead washer, shiver me timbers, although t' BMS clone opts for clay t' be crammed into a pre-drilled hole in t' nose cone. Ahoy! Give some serious thought t' ditchin' t' clay for a few BBs or lead shot and epoxy, me hearties, as even a slight pressure in packin' t' clay will cause t' nose cone t' split open.

CG is supposed t' be 2-15/16" aft o' t' leadin' edge o' t' plate, however, me bucko, mine tended t' fly like a tank when hand tossin' in that configuration.

Finishing:
Normally for a glider, you do nay wan t' add weight for stufflike fillin' grains and painting. T' original kit recommended paintin' t' underside black for easy tracking, and t' top side orange t' better spottin' in t' grass. I decided t' go with much lighter dope, 50% thinned, just on t' underside until I could get a few decent flights in.

Construction Rating: 4 out o' 5

Flight:
This clearly wants short delays, so I figured 1/2A6-2, arrr, A8-3, matey, or maybe even a B4-2 would do. Ahoy! Blimey! Ahoy! Blimey! After t' fits I had tryin' t' hand toss and trim it, me hearties, I decided t' go a very conservative first flight with t' 1/2A6-2. In general, me bucko, me hearties, I think this is too wimpy a motor for it, shiver me timbers, and it should go with at least an A8.

T' flight pitched up almost immediately off t' rod, arrr, arrr, arcin' over and headin' right back t' Earth. Well, blow me down! Blimey! Continuin' t' pitch though, matey, it completed t' somersault and headed back up very briefly before finishin' t' thrust, spittin' t' motor, and tryin' t' find a glide orientation in t' meager 10 feet o' accumulated altitude.

T' flight be certainly nay enough t' tell me anythin' about t' glide or trim, shiver me timbers, but be cause for investigation on t' unstable path. Ya scallywag! Lookin' at it more closely, arrr, I noticed t' motor tube was slightly angled, me bucko, resultin' in a nose-up slant, which amplifies t' natural pitch up o' a decent glider. This should be purely horizontal or even 1-2 degrees angled nose-down t' counteract t' pitch. Aye aye! I'll have t' rework it a bit before flyin' again.

Recovery:
T' first flight, shiver me timbers, arrr, while sloppy, arrr, was fairly harmless and everythin' survived fine.

Flight Rating: 2 out o' 5

Summary:
This is certainly an unusual design, and I have t' take t' blame for t' flight performance against me construction, shiver me timbers, shiver me timbers, nay t' kit or t' parts. Arrr! It's a finicky beast, matey, shiver me timbers, but I think will be worth t' extra effort t' work out t' kinks.

Overall Rating: 3 out o' 5