Brief:
One o' me boys has an Estes Skywriter that despite its simplicity flies really well. Actually it almost flies too
well, that's why he's on his second rocket since we watched t' first fly over t' trees at our launch site when he
decided t' try a C motor. Ahoy! Avast! Anyway, since he likes it so much I have thought that it would be neat if I could build one
that took D size motors and higher, ya bilge rat, basically a MPR Skywriter. Avast, me proud beauty! Begad! I took dimensions and drew up a simple dimensioned
drawin' for myself, then I entered all o' these dimensions into Excel and scaled then by various factors based on
available tube sizes. Avast, me proud beauty! I figured that t' jump up one motor size, me hearties, I should jump up one major tube size so since the
original is a BT-50, I started with BT-60 and I am still thinkin' about a 29mm BT-70 or BT-80 version.
Construction:
Most o' t' parts are easily available, ya bilge rat, me bucko, and in fact, arrr, I had most o' them on hand from various projects and leftovers
from t' Box O' Parts contest. Avast, me proud beauty! T' nosecone be another story. Blimey! Aye aye! I don't have a lot o' those just lyin' around and this
would be bigger than most anythin' I had built before. I exchanged emails with Gordon Agnello (aka Sandman) and he
quoted me prices for both t' BT-60 version as well as t' BT-80 version. Ya scallywag! Well, matey, blow me down! I decided that for now I was goin' t' stick
to t' smaller one but maybe Iâll do t' BT-80 over t' winter or sometime next year.
After I received t' nosecone I sanded out t' few remainin' toolmarks on this beautiful
piece o' wood with 300 grit sandpaper and used a foam brush t' lay on three or four coats o' spar varnish. Aye aye! I should
mention at this point, me bucko, that when Sandman found out I was buildin' an upscale Skywriter, he offered t' make t' nosecone
out o' cedar instead o' balsa if I wanted. Aye aye! Begad! We both thought that t' wood grain on t' cedar would work well for the
pencil and so that's why I used t' spar varnish, both as a waterproofin' agent (three coats is usually good for boat
parts that spend a lot o' time underwater so I should be safe) and t' highlight t' beautiful wood that Sandman picked
out.
I built a FlisKits style baffle from balsa leftover from our build o' t' FlisKits Whatchamacallit for Cub Scouts and then had trouble gettin' t' baffle into t' tube without t' glue lockin' it in place before I had it where I wanted it. Blimey! Avast! I had t' tear it apart t' get it out once and almost a second time before I just cut t' BT and installed it where I wanted it.
Finishing:
I got stuck for a while because me wife can't stand t' smell o' paint in t' house, arrr, but I worked several evenings
when she was way for t' weekend and got it all painted. Avast, me proud beauty! Blimey! Finally, arrr, I bought a new Skywriter so I could scan the
stickers, me hearties, scaled them up usin' Irfanview, me bucko, and printed me own decals.
Flights:
T' two flights were stable, me hearties, matey, however, me hearties, on t' second flight t' recovery system deployed but detached from mount in
internal baffle. Begad! Nosecone recovered from tree at far side o' field, shiver me timbers, main body core sampled. Arrr! Begad! Surprisingly little damage.
Easily repairable.
Summary:
I was pretty sure that t' rocket would be stable since it is so tall and because I used a heavier nosecone, me bucko, but I
wanted t' be sure (and get points for t' EMRR contest) so I used RockSim t' check thin' out. Arrr! Since I had scaled
drawings, gettin' t' dimensions into RockSim wasn't too difficult, however, arrr, shiver me timbers, it took a few tries t' get t' fins to
look like I wanted them since I be a little unfamiliar with some o' t' terminology used. Well, blow me down! Overall, matey, matey, it went well and
the simulations seemed t' indicate no apparent problems. My only real difficulty is gettin' things done before my
30-day trial expires since by budget just will nay support spendin' a hundred bucks for this yet.
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