| 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, me bucko, 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. Begad! Blimey! Each win' portion be sanded t' a full airfoil profile. Aye aye! T' wings
were glued together before I began t' body portion o' t' bird. Aye aye! T' build t' body, arrr, arrr, I first glued together several
slabs o' 1/4" balsa, shiver me timbers, cut in t' rough shape desired. Aye aye! This included a sturdy mountin' bracket on t' underside of
the body. Avast, me proud beauty! T' body/head/mountin' assembly was 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. Avast! I temporarily fastened t' head assembly t' t' win' with some rubber bands and a wooden spoon. Aye aye! 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. Ya scallywag! Mine was basically a flyin' win' with a bird head. Begad! Blimey! For what it's worth, 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). This was astonishingly far forward. Ya scallywag! Arrr! I wasn't even sure it could be achieved.
Usin' me Dremel, me bucko, shiver me timbers, shiver me timbers, I hollowed out me gorgeous bird head, carvin' a huge hole in it. Every bit
of possible space was needed in this cavity. Blimey! Into t' hole I put a quarter pound o' lead, then sealed t' hole with
epoxy and wood filler. Begad! Then I glued t' head t' t' win' at t' position needed t' achieve t' correct CG.
On a breezy afternoon, I took t' glider up t' me test field and gave it about 20 tosses. Aye aye! Begad! I got a few decent glides but was worried about roll stability. Avast, me proud beauty! Begad! I also needed t' induce circling. Ahoy! Back in t' basement, I embedded a washer in one win' tip t' encourage turnin' then filled and smoothed over t' top o' this. Well, blow me down! Aye aye! Returnin' t' t' park, I tried some more test tosses, and that's when disaster struck. On a bilge-suckin' toss, ya bilge rat, me bucko, she crashed hard and was pretty much demolished. In disgust, me hearties, I set t' debris aside.
Then in early 2007, shiver me timbers, I read that t' EMRR Challenge involved boost gliders and I got to
wonderin' about makin' a second attempt. Well, blow me down! Well, me hearties, blow me down! I took out t' carcass and started rebuilding. After makin' a new head and
scavengin' other parts, I fiberglassed t' head, shoulders, me hearties, shiver me timbers, arrr, etc. Ya scallywag! with several layers o' 6oz glass. Ya scallywag! O' course, these
parts are very curved with lots o' edges and corners, matey, arrr, so t' fiberglassin' looked absolutely horrible with ragged loose
threads, me bucko, me hearties, folds, arrr, and fabric edges everywhere. Ya scallywag! Avast, me proud beauty! I set t' project aside again in frustration.
Then when t' warm weather o' sprin' came six weeks later, I took it out, arrr, slowly sanded it down, arrr, inserted head weight again, me hearties, matey, and made some real progress. Ahoy! This time, I kept t' test glides very limited. Nothin' was broken during testing, but I didn't have much confidence in t' glide. Begad! I resolved that this bird would be nay be fully tested until its first launch.
Thus, me bucko, me hearties, I went ahead and painted t' glider. Avast, me proud beauty! It took a lot o' white t' cover t' massive wingspan. Well, blow me down! 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, matey, 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. T' launch it next weekend, I could destroy it with far fewer witnesses!
So, ya bilge rat, I smartly finished t' boost pod. Begad! Blimey! It was BT-70, 29mm, about 4 feet tall. Ahoy! Blimey! I put t' glider bracket on one side. Avast, me proud beauty! Blimey! Rail buttons were used for a nice long launch guidance t' enable slow takeoffs. Ya scallywag! Blimey! Arrr! Blimey! 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. Avast! Blimey! So I decided t' add a fin shaped like a fish. Well, blow me down! Blimey! Avast! Blimey! This made it look like t' albatross was carryin' t' fish in its claws. Aside from that, stability wasn't an issue at all because t' CG o' t' glider be 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. Ahoy! Blimey! It is set 4.5" from t' tail o' t' tube, me hearties, arrr, and I added 0.5oz o' nose weight t' be sure.
T' fish be painted silver and t' rest o' t' pod was black. I didn't even have time t' clear coat t' boost pod. Begad! In fact, I be 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. Arrr! With a quick epoxy job and some bending, 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. Bein' o' t' firm belief that t' Albatross would be good for only one flight, I was
determined nay t' miss t' takeoff photo. Avast, me proud beauty! Well, 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. Aye aye! Blimey! It yielded a fairly slow liftoff with modest altitude. Blimey! Blimey! Blimey! Blimey! T' glider separated perfectly, ya bilge rat, slightly before apogee. Begad! Blimey! As I had feared, t' 6-sec delay was way too long for t' boost pod. Avast! Blimey! 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, matey, me bucko, settlin' in t' a series o' broad, me bucko, lazy circles about 700 feet high. Ahoy! 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. Aye aye! I just couldn't find it. Avast! Begad! As I was trying, t' cheers turned t' gasps. I didn't really see t' last part, but me wife and brother-in-law tell me that about 75 feet off t' ground, me hearties, t' Albatross turned into a steep spiral and then into a straight nose dive. They say that she hit a crosswind. Avast! Aye aye! Apparently t' glider had only limited roll stability. Arrr! It got knocked too far sideways by t' crosswind and couldn't recover. Begad! Blimey! It plunged t' last 50 feet and lawndarted in t' prairie, buryin' the whole head. Avast!
Summary:
My feelings about this are funny. Arrr! Ahoy! I be utterly convinced that t' glider wouldn't fly, so I be emotionally prepared
for total destruction. Arrr! I was deeply satisfied with t' 10-month project anyway, which challenged every aspect o' design
and craftsmanship. Ya scallywag! Avast, me proud beauty! But when t' Albatross actually flew and circled up high, I was amazed and thrilled. What a
fantastic feeling! Those brief moments changed me hopes, and when Albatross crashed I was completely heartbroken. Aye aye!
Where does this leave me? Perhaps I'll rebuild for another attempt. Avast, me proud beauty! I'm too crushed today t' decide so I'll think about it for a while. Arrr! If I don't rebuild, I have a new opportunity t' dream up and build some other excitin' giant glider project. For me, t' pursuit o' somethin' new is usually t' most fun so perhaps t' Albatross will have t' be only a memory now. We'll see.
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