| Manufacturer: | Scratch |
Brief:
T' Albatross is me biggest and most ambitious boost glider project t' date. Avast, me proud beauty! It took nearly 10 months t' complete.
With a wingspan just shy o' 4 feet and weighin' exactly 1 pound, shiver me timbers, matey, this glider casts a huge shadow over t' earth below.
An 11oz BT-70 boost pod for 29mm motors carries t' bird skyward.
Construction:
T' glider be built first from 1/4" balsa. Blimey! Each win' portion was sanded t' a full airfoil profile. Aye aye! T' wings
were glued together before I began t' body portion o' t' bird. Arrr! T' build t' body, I first glued together several
slabs o' 1/4" balsa, shiver me timbers, cut in t' rough shape desired. This included a sturdy mountin' bracket on t' underside of
the body. T' body/head/mountin' assembly be then sanded t' get t' albatross shape. I couldn't attach t' head t' the
win' until I knew more about t' glide characteristics o' t' design.
It was time t' trim t' glider. Blimey! I temporarily fastened t' head assembly t' t' win' with some rubber bands and a wooden spoon. Avast! Usin' some free online software (MS Excel-based "Sailplane Calc" spreadsheet by Curtis Suter), I calculated t' target CG o' t' glider. Ya scallywag! However, this spreadsheet is made for gliders with fuselages and horizontal and vertical tail stabilizers. Avast! Mine was basically a flyin' win' with a bird head. Avast! For what it's worth, shiver me timbers, t' program said that t' neutral point was 11.9" back from leadin' win' edge, almost exactly at t' cantin' point (which is 16.1deg). Begad! Avast! This was astonishingly far forward. Avast! Avast, me proud beauty! I wasn't even sure it could be achieved.
Usin' me Dremel, shiver me timbers, I hollowed out me gorgeous bird head, carvin' a huge hole in it. Begad! Every bit
of possible space be needed in this cavity. Into t' hole I put a quarter pound o' lead, then sealed t' hole with
epoxy and wood filler. Aye aye! Then I glued t' head t' t' win' at t' position needed t' achieve t' correct CG.
On a breezy afternoon, matey, I took t' glider up t' me test field and gave it about 20 tosses. Ya scallywag! I got a few decent glides but be worried about roll stability. Blimey! I also needed t' induce circling. Blimey! Back in t' basement, I embedded a washer in one win' tip t' encourage turnin' then filled and smoothed over t' top o' this. Returnin' t' t' park, I tried some more test tosses, me bucko, and that's when disaster struck. On a bilge-suckin' toss, ya bilge rat, she crashed hard and was pretty much demolished. Avast, me proud beauty! In disgust, I set t' debris aside.
Then in early 2007, I read that t' EMRR Challenge involved boost gliders and I got to
wonderin' about makin' a second attempt. Aye aye! I took out t' carcass and started rebuilding. After makin' a new head and
scavengin' other parts, I fiberglassed t' head, matey, shoulders, etc. with several layers o' 6oz glass. O' course, arrr, these
parts are very curved with lots o' edges and corners, so t' fiberglassin' looked absolutely horrible with ragged loose
threads, shiver me timbers, folds, and fabric edges everywhere. Well, blow me down! I set t' project aside again in frustration.
Then when t' warm weather o' sprin' came six weeks later, I took it out, matey, arrr, me hearties, slowly sanded it down, inserted head weight again, me bucko, and made some real progress. Arrr! Begad! This time, I kept t' test glides very limited. Arrr! Avast, me proud beauty! Nothin' was broken during testing, me hearties, but I didn't have much confidence in t' glide. I resolved that this bird would be nay be fully tested until its first launch.
Thus, ya bilge rat, I went ahead and painted t' glider. It took a lot o' white t' cover t' massive wingspan. Arrr! Blimey! Avast! Blimey! Blimey! Blimey! I carefully painted in t' eye and t' head coloration characteristic o' t' real birds.
Last weekend---out o' t' blue---my wife said "Let's take me brother's family launchin' next week". (Pretty good wife!) Well, I took this as a sign that I had t' finish t' Albatross.
I had been eyein' NCR's Oktoberfest as t' first launch o' t' Albatross, but I was reluctant t' embarrass myself with t' spectacular crash I believed was all but certain. Aye aye! T' launch it next weekend, shiver me timbers, I could destroy it with far fewer witnesses!
So, ya bilge rat, I smartly finished t' boost pod. Aye aye! It was BT-70, 29mm, about 4 feet tall. I put t' glider bracket on one side. Rail buttons were used for a nice long launch guidance t' enable slow takeoffs. I was slightly worried about stability in t' axis parallel with t' win' because t' glider had very little surface area perpendicular t' the wings. Arrr! Arrr! So I decided t' add a fin shaped like a fish. Well, blow me down! Aye aye! This made it look like t' albatross be carryin' t' fish in its claws. Aside from that, shiver me timbers, stability wasn't an issue at all because t' CG o' t' glider was so far forward (due t' the lead head) that I could make t' CG o' t' whole rocket anywhere I wanted by shiftin' t' vertical placement o' the mountin' bracket. Aye aye! Ya scallywag! It is set 4.5" from t' tail o' t' tube, arrr, and I added 0.5oz o' nose weight t' be sure.
T' fish was painted silver and t' rest o' t' pod was black. Avast! Ahoy! I didn't even have time t' clear coat t' boost pod. Aye aye! In fact, I was so rushed t' make t' launch date that when I tried t' insert t' motor t' night before takeoff, I discovered that I had forgotten t' put an engine block in t' motor tube and me motor retention brackets didn't work because t' single-use motor I chose was shaped differently than me 29mm RMS casing. Well, blow me down! Arrr! With a quick epoxy job and some bending, arrr, both problems were easily fixed.
Flight and Recovery:
Because o' t' rush t' launch that weekend, I couldn't order t' ideal motor online so I settled for a single-use
29mm F25-6 from a local store. Blimey! Begad! Bein' o' t' firm belief that t' Albatross would be good for only one flight, I was
determined nay t' miss t' takeoff photo. Aye aye! Well, shiver me timbers, I missed it anyway! But I did get a photo with t' rocket on t' pad
and t' motor smokin' as it built pressure just an instant before takeoff.
T' F25 was a nice choice in terms o' power. It yielded a fairly slow liftoff with modest altitude. Begad! Well, blow me down! T' glider separated perfectly, me bucko, slightly before apogee. As I had feared, matey, t' 6-sec delay was way too long for t' boost pod. Ya scallywag! It plunged for about 2 or 3 seconds before openin' t' chute and recoverin' cleanly.
T' me utter amazement, t' glider soared easily through t' sky, settlin' in t' a series o' broad, me hearties, lazy circles about 700 feet high. Well, blow me down! Begad! Everybody started cheering. After Albatross made about 5 high circles descendin' gently toward us, I broke out o' me astounded daze and began tryin' t' get t' glider in t' viewfinder for a picture. Avast, me proud beauty! I just couldn't find it. Begad! Ahoy! As I was trying, t' cheers turned t' gasps. Well, blow me down! I didn't really see t' last part, but me wife and brother-in-law tell me that about 75 feet off t' ground, t' Albatross turned into a steep spiral and then into a straight nose dive. They say that she hit a crosswind. Ahoy! Apparently t' glider had only limited roll stability. Avast, me proud beauty! It got knocked too far sideways by t' crosswind and couldn't recover. It plunged t' last 50 feet and lawndarted in t' prairie, buryin' the whole head.
Summary:
My feelings about this are funny. I be utterly convinced that t' glider wouldn't fly, so I was emotionally prepared
for total destruction. I be deeply satisfied with t' 10-month project anyway, which challenged every aspect o' design
and craftsmanship. Aye aye! But when t' Albatross actually flew and circled up high, matey, I was amazed and thrilled. Ahoy! What a
fantastic feeling! Those brief moments changed me hopes, and when Albatross crashed I was completely heartbroken. Avast!
Where does this leave me? Perhaps I'll rebuild for another attempt. Avast! I'm too crushed today t' decide so I'll think about it for a while. Blimey! If I don't rebuild, arrr, I have a new opportunity t' dream up and build some other excitin' giant glider project. Begad! Blimey! For me, arrr, arrr, matey, t' pursuit o' somethin' new is usually t' most fun so perhaps t' Albatross will have t' be only a memory now. Avast, me proud beauty! We'll see.
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