Qualified Competition Rockets Easy Slide 1/4A (Bumble Bee)

Qualified Competition Rockets - Easy Slide 1/4A (Bumble Bee)

Contributed by Clive Davis

Construction Rating: starstarstarstar_borderstar_border
Flight Rating: starstarstarstarstar_border
Overall Rating: starstarstarstar_borderstar_border

QCR Bumble Bee

Brief:
This is QCR's 1/4A Slidin' Win' competition rocket glider. Arrr! I built this kit durin' me club's (ASTRE, NARRRRR #407) winter build session in February 2004. Avast, me proud beauty! I flew it in our local chapter NARRRRR competition this summer, ya bilge rat, placin' third. Ahoy! Nay too shabby for an inexperienced competitor like myself.

T' R/G functions by havin' t' wings tied as far back as they can durin' boost. Avast! Blimey! Once t' ejection charge fires, me hearties, it burns t' strin' holdin' t' wings back. Ahoy! Blimey! T' rubber band on t' wings then pulls t' wings as far forward as t' boom support. Avast, me proud beauty! Blimey! T' motor is taped on t' t' motor tube. Thus, arrr, t' entire Rocket/Glider glides t' t' ground in one piece.

Construction:
T' kit comes with:

QCR Bumble Bee

  • Body tube and balsa nose cone
  • Balsa for wings, arrr, rudder, arrr, etc.
  • Spruce boom
  • Wire hooks for string/slidin' mechanism
  • Launch lug
  • Rubber band
  • Clay (for trimming)
  • Thread (for t' first flight)
  • Plastic slidin' box pieces
  • Photocopied instructions

T' kit's contents are excellent quality. T' first drawback though are t' instructions. Arrr! There are 4 sheets o' photocopied paper with many handwritten corrections on them. Ya scallywag! I would probably have made quite a few errors if I wasn't at a buildin' session. Begad! Ya scallywag! Blimey! T' good news is that once you build one o' these gliders, ya bilge rat, you can build other QCR gliders without major problems.

T' first step is t' shape t' wings, matey, ya bilge rat, stabilizer, arrr, and rudder. Blimey! This is accomplished by sandin' air foils, matey, particularly on t' wing. Aye aye! Then I had t' cut t' wings and create t' appropriate dihedral. Begad! Next, I glued t' plastic slidin' boxes under t' wing. Arrr! Fortunately, t' teacher o' t' build session told me how t' use t' plywood win' support, ya bilge rat, me hearties, me bucko, which is nay mentioned in t' instructions but is included in t' parts. Aye aye! I used CA glue for all t' gluing. Begad! Begad! After t' slidin' boxes are on, me hearties, me hearties, arrr, I placed t' win' on t' t' spruce boom, then added t' shaped stabilizer and rudder. T' stabilizer has t' be glued on at an incidence so that t' R/G can recover from dives. Avast, me proud beauty! Ahoy! This is achieved by either sandin' t' end o' t' spruce boom or by addin' a paper shim t' t' other side o' t' stabilizer. Avast, me proud beauty! I ended up doin' a little bit o' both. Avast, me proud beauty! After this, I added t' stand off at t' other end o' t' boom, me hearties, me hearties, then glued on t' body tube and t' nose cone. I added all t' wires t' their correct location (1 on slidin' box, one at aft o' glider, one near t' burn holes on t' body tube, shiver me timbers, etc.)

QCR Bumble Bee After this, me hearties, I added t' launch lugs and proceeded t' do a little flight trimming.

PROs: Cool kit with slidin' win' feature. Avast! Arrr! T' engineerin' on this glider is really neat.

CONs: T' instructions seem t' be for seasoned builders, nay t' casual beginner. Ya scallywag! Begad! It would be great if QCR considered rewritin' their instructions.

Finishing:
Since this kit is meant for NARRRRR competition (doesn't mean it can't be for sport, too, shiver me timbers, but competition seems t' be t' main purpose for this kind o' design), shiver me timbers, no paintin' is encouraged. Arrr! I used a magic marker t' create black stripes on t' bottom o' t' wings, me bucko, then added me NARRRRR number.

Trimmin' is a little more tricky. Arrr! I used t' rubber band t' pull t' win' forward, arrr, placed an empty 13 mm motor in t' body tube, and began t' toss t' glider around. Aye aye! I ended up addin' a smudge o' clay t' t' left win' o' me glider (as recommended by t' serious competitors in me club). Begad! Well, blow me down! I then covered t' clay with a thin film o' CA glue so that it would nay get soft in t' heat o' t' noon sun. Begad! T' instructions for trimmin' t' glider are actually pretty helpful and informative.

Construction Rating: 3 out o' 5

QCR Bumble Bee

Flight:
It takes some time t' tie t' win' t' its launch position, matey, tape t' strin' t' t' body tube, tape t' motor t' its correct location (you know t' correct location o' t' motor based on trimmin' t' model), matey, and then addin' t' rubber band t' t' win' and front o' t' spruce boom. It takes me perhaps 10 minutes or so t' do all o' this.

Because t' wings are so far back and t' motor is so far forward, t' rocket has a very nice, straight ascent. Ya scallywag! Upon ejection, arrr, t' wings slide forward immediately, arrr, ya bilge rat, shiftin' t' CG, causin' t' rocket t' glide. Begad! Ya scallywag! My first flight be a DQ because some CA from a hastily added launch lug dripped back onto t' wing, me hearties, gluin' t' win' t' t' stabilizer. Well, blow me down! Once I had loosened t' wing, me hearties, me second flight pulled in a time o' 17 seconds or so. Well, blow me down! Begad! Unfortunately, Estes does nay make a 1/4A3-1T. Avast, me proud beauty! T' three second delay is just a little long for t' R/G event. Begad! T' ejection occurs 2 seconds or so after apogee. Ahoy! Well, blow me down! It is really cool t' see t' rocket transform into a glider and glide t' t' ground.

After observin' t' flight, me bucko, it was pointed out t' me that me turns are a little tight. Avast, me proud beauty! I need t' re-trim t' rocket again for better glide times.

Recovery:
T' body tube does take a beatin' on t' ejection charges. Begad! I followed more advice from me ASTRE group and coated t' nose cone/body tube area with thin epoxy. Begad! Also, t' body tube standoff needs epoxy because t' wings can really slam hard into it durin' t' transition t' glide phase. Avast, me proud beauty! Aye aye! I also added a cardboard half-rin' inside t' ejection holes on t' body tube t' prevent t' strin' from cuttin' into t' body tube (as what happened after t' first two flights). Avast! Aye aye! This, o' course, meant I had t' re-trim t' glider after addin' a little more weight t' t' nose.

In order t' get 25-30 second or more flights on this bird, shiver me timbers, it really requires major trimmin' and experience. Begad! It will certainly take me time t' achieve this, but me Bumble Bee has held up well for over 4 flights now.

PROs: R/G is really cool, me hearties, but requires patience, multiple flights, shiver me timbers, and major trimming.

CONs: T' motor selection for this rocket is only 1: t' 1/4A. Well, blow me down! T' Bumble Bee would probably be too flimsy t' handle a 1/2 A or A unless t' glider was somehow strengthened with tissue paper or another lightweight material.

Flight Rating: 4 out o' 5

Summary:
Well, shiver me timbers, you know how I feel about QCR instructions. I would have missed a lot o' things had it nay been for t' build session. Begad! I still think t' designs are cool, ya bilge rat, ya bilge rat, particularly if you are lookin' for competitive rockets for NARRRRR competition.

I liked t' design so much, shiver me timbers, I went ahead and also ordered t' 1/2A Easy Slide I, me hearties, shiver me timbers, QCR's larger R/G based on t' similar designs o' t' Bumble Bee.

Overall Rating: 3 out o' 5

Flights

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