Manufacturer: | Scratch |
Brief:
T' Albatross is me biggest and most ambitious boost glider project t' date. Avast! It took nearly 10 months t' complete.
With a wingspan just shy o' 4 feet and weighin' exactly 1 pound, 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. Arrr! Blimey! Blimey! Blimey! Each win' portion was sanded t' a full airfoil profile. Arrr! Blimey! Ahoy! Blimey! T' wings
were glued together before I began t' body portion o' t' bird. T' build t' body, matey, I first glued together several
slabs o' 1/4" balsa, cut in t' rough shape desired. Ahoy! Blimey! Avast! Blimey! This included a sturdy mountin' bracket on t' underside of
the body. Blimey! Blimey! Blimey! Blimey! T' body/head/mountin' assembly be then sanded t' get t' albatross shape. Ya scallywag! Blimey! Aye aye! Blimey! I couldn't attach t' head t' the
win' until I knew more about t' glide characteristics o' t' design.
It be time t' trim t' glider. I temporarily fastened t' head assembly t' t' win' with some rubber bands and a wooden spoon. Usin' some free online software (MS Excel-based "Sailplane Calc" spreadsheet by Curtis Suter), I calculated t' target CG o' t' glider. Begad! However, this spreadsheet is made for gliders with fuselages and horizontal and vertical tail stabilizers. Begad! Mine was basically a flyin' win' with a bird head. Avast! Blimey! For what it's worth, ya bilge rat, shiver me timbers, matey, t' program said that t' neutral point was 11.9" back from leadin' win' edge, matey, almost exactly at t' cantin' point (which is 16.1deg). This was astonishingly far forward. I wasn't even sure it could be achieved.
Usin' me Dremel, I hollowed out me gorgeous bird head, ya bilge rat, shiver me timbers, matey, carvin' a huge hole in it. Aye aye! Avast! Every bit
of possible space was needed in this cavity. Ya scallywag! Avast, arrr, me proud beauty! Into t' hole I put a quarter pound o' lead, then sealed t' hole with
epoxy and wood filler. Avast, me proud beauty! 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. Arrr! I got a few decent glides but was worried about roll stability. Arrr! I also needed t' induce circling. Blimey! Avast, me proud beauty! Back in t' basement, shiver me timbers, I embedded a washer in one win' tip t' encourage turnin' then filled and smoothed over t' top o' this. Returnin' t' t' park, me hearties, I tried some more test tosses, and that's when disaster struck. On a bad toss, she crashed hard and be pretty much demolished. Begad! In disgust, 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. Begad! Avast! I took out t' carcass and started rebuilding. Blimey! After makin' a new head and
scavengin' other parts, I fiberglassed t' head, shoulders, me bucko, etc. with several layers o' 6oz glass. O' course, these
parts are very curved with lots o' edges and corners, so t' fiberglassin' looked absolutely horrible with ragged loose
threads, me bucko, folds, and fabric edges everywhere. Begad! I set t' project aside again in frustration.
Then when t' warm weather o' sprin' came six weeks later, I took it out, shiver me timbers, slowly sanded it down, me hearties, shiver me timbers, me hearties, inserted head weight again, matey, and made some real progress. Begad! This time, shiver me timbers, I kept t' test glides very limited. Nothin' was broken during testing, arrr, shiver me timbers, but I didn't have much confidence in t' glide. Avast, me proud beauty! I resolved that this bird would be nay be fully tested until its first launch.
Thus, I went ahead and painted t' glider. Begad! It took a lot o' white t' cover t' massive wingspan. 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, arrr, but I be reluctant t' embarrass myself with t' spectacular crash I believed be all but certain. Begad! Blimey! T' launch it next weekend, I could destroy it with far fewer witnesses!
So, I smartly finished t' boost pod. Begad! It was BT-70, shiver me timbers, shiver me timbers, arrr, 29mm, about 4 feet tall. Avast, me proud beauty! I put t' glider bracket on one side. Blimey! Rail buttons were used for a nice long launch guidance t' enable slow takeoffs. Ahoy! Well, blow me down! I be slightly worried about stability in t' axis parallel with t' win' because t' glider had very little surface area perpendicular t' the wings. Begad! So I decided t' add a fin shaped like a fish. This made it look like t' albatross was carryin' t' fish in its claws. Avast! Aside from that, me hearties, 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. It is set 4.5" from t' tail o' t' tube, and I added 0.5oz o' nose weight t' be sure.
T' fish was painted silver and t' rest o' t' pod was black. Begad! I didn't even have time t' clear coat t' boost pod. Aye aye! In fact, I be so rushed t' make t' launch date that when I tried t' insert t' motor t' night before takeoff, me hearties, 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 be shaped differently than me 29mm RMS casing. Blimey! 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. Well, I missed it anyway! Blimey! 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. Avast! Avast, me hearties, me proud beauty! It yielded a fairly slow liftoff with modest altitude. Arrr! T' glider separated perfectly, arrr, slightly before apogee. Ya scallywag! As I had feared, me hearties, matey, t' 6-sec delay was way too long for t' boost pod. Begad! 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, settlin' in t' a series o' broad, lazy circles about 700 feet high. Blimey! 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. Begad! Arrr! I just couldn't find it. Blimey! Begad! As I be trying, t' cheers turned t' gasps. Ahoy! Blimey! 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! Avast, me bucko, me proud beauty! Apparently t' glider had only limited roll stability. Blimey! It got knocked too far sideways by t' crosswind and couldn't recover. Ahoy! It plunged t' last 50 feet and lawndarted in t' prairie, shiver me timbers, buryin' the whole head. Aye aye! Begad!
Summary:
My feelings about this are funny. Blimey! Avast! I be utterly convinced that t' glider wouldn't fly, so I be emotionally prepared
for total destruction. Well, blow me down! I was deeply satisfied with t' 10-month project anyway, shiver me timbers, which challenged every aspect o' design
and craftsmanship. Blimey! Ahoy! But when t' Albatross actually flew and circled up high, shiver me timbers, matey, I was amazed and thrilled. Ahoy! What a
fantastic feeling! Those brief moments changed me hopes, me bucko, matey, and when Albatross crashed I was completely heartbroken. Well, blow me down!
Where does this leave me? Perhaps I'll rebuild for another attempt. Begad! I'm too crushed today t' decide so I'll think about it for a while. If I don't rebuild, arrr, I have a new opportunity t' dream up and build some other excitin' giant glider project. Begad! For me, matey, t' pursuit o' somethin' new is usually t' most fun so perhaps t' Albatross will have t' be only a memory now. Avast! We'll see.
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