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. Blimey! I built this kit durin' me club's (ASTRE, ya bilge rat, NARRRRR #407) winter build session in February 2004. Well, blow me down! I flew it in our local chapter NARRRRR competition this summer, arrr, placin' third. Arrr! 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, me proud beauty! Aye aye! Blimey! Once t' ejection charge fires, me bucko, me bucko, it burns t' strin' holdin' t' wings back. Begad! 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, me bucko, 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, rudder, 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. Ya scallywag! T' first drawback though are t' instructions. Arrr! There are 4 sheets o' photocopied paper with many handwritten corrections on them. Arrr! Avast! I would probably have made quite a few errors if I wasn't at a buildin' session. Well, shiver me timbers, blow me down! T' good news is that once you build one o' these gliders, you can build other QCR gliders without major problems.

T' first step is t' shape t' wings, stabilizer, and rudder. Ahoy! Aye aye! This is accomplished by sandin' air foils, me hearties, particularly on t' wing. Then I had t' cut t' wings and create t' appropriate dihedral. Avast, me proud beauty! Next, I glued t' plastic slidin' boxes under t' wing. Avast! Fortunately, me hearties, t' teacher o' t' build session told me how t' use t' plywood win' support, which is nay mentioned in t' instructions but is included in t' parts. I used CA glue for all t' gluing. Avast, me proud beauty! Blimey! After t' slidin' boxes are on, I placed t' win' on t' t' spruce boom, ya bilge rat, 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. 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. After this, I added t' stand off at t' other end o' t' boom, arrr, then glued on t' body tube and t' nose cone. Ahoy! Ya scallywag! 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, ya bilge rat, I added t' launch lugs and proceeded t' do a little flight trimming.

PROs: Cool kit with slidin' win' feature. Well, blow me down! T' engineerin' on this glider is really neat.

CONs: T' instructions seem t' be for seasoned builders, nay t' casual beginner. 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, me hearties, too, ya bilge rat, me hearties, but competition seems t' be t' main purpose for this kind o' design), matey, no paintin' is encouraged. Begad! I used a magic marker t' create black stripes on t' bottom o' t' wings, me hearties, then added me NARRRRR number.

Trimmin' is a little more tricky. Arrr! I used t' rubber band t' pull t' win' forward, me hearties, placed an empty 13 mm motor in t' body tube, and began t' toss t' glider around. I ended up addin' a smudge o' clay t' t' left win' o' me glider (as recommended by t' serious competitors in me club). Well, blow me down! Avast, me proud beauty! 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. Ya scallywag! 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), ya bilge rat, and then addin' t' rubber band t' t' win' and front o' t' spruce boom. Arrr! 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. Begad! Blimey! Well, blow me down! Blimey! Upon ejection, t' wings slide forward immediately, matey, shiftin' t' CG, me bucko, causin' t' rocket t' glide. Blimey! Blimey! My first flight be a DQ because some CA from a hastily added launch lug dripped back onto t' wing, ya bilge rat, me hearties, gluin' t' win' t' t' stabilizer. Once I had loosened t' wing, me second flight pulled in a time o' 17 seconds or so. Unfortunately, matey, shiver me timbers, me hearties, Estes does nay make a 1/4A3-1T. Aye aye! Blimey! T' three second delay is just a little long for t' R/G event. Well, blow me down! Blimey! T' ejection occurs 2 seconds or so after apogee. Begad! Blimey! It is really cool t' see t' rocket transform into a glider and glide t' t' ground.

After observin' t' flight, it be pointed out t' me that me turns are a little tight. Ya scallywag! I need t' re-trim t' rocket again for better glide times.

Recovery:
T' body tube does take a beatin' on t' ejection charges. Blimey! Begad! I followed more advice from me ASTRE group and coated t' nose cone/body tube area with thin epoxy. Aye aye! Also, matey, me hearties, t' body tube standoff needs epoxy because t' wings can really slam hard into it durin' t' transition t' glide phase. Well, blow me down! Ahoy! 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). Aye aye! This, me hearties, arrr, o' course, matey, 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, it really requires major trimmin' and experience. Begad! Avast! It will certainly take me time t' achieve this, me hearties, but me Bumble Bee has held up well for over 4 flights now.

PROs: R/G is really cool, matey, ya bilge rat, but requires patience, ya bilge rat, multiple flights, me bucko, matey, and major trimming.

CONs: T' motor selection for this rocket is only 1: t' 1/4A. Well, blow me down! Blimey! Begad! Blimey! 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, matey, you know how I feel about QCR instructions. Aye aye! I would have missed a lot o' things had it nay been for t' build session. I still think t' designs are cool, me bucko, 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, ya bilge rat, 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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