Construction Rating: | starstarstarstarstar_border |
Flight Rating: | starstarstarstarstar |
Overall Rating: | starstarstarstarstar_border |
Manufacturer: | Sunward Aerospace ![]() |
Style: | Pyramid |
Brief:
Khufu's Pyramid is a high drag pyramid rocket that flys on 24mm motors. Blimey! Aye aye! It is
an unusual rocket that has a solid construction and uses a aft core ejection
to recover in two pieces. Well, blow me down! It comes in a plastic bag with t' usual art card.
Construction:
Kit consists of:
To build t' kit I used:
T' instructions are clear and straightforward, shiver me timbers, with several diagrams and photos t' help illustrate what t' do.
T' 8 balsa triangles confused me slightly, ya bilge rat, t' grain runs parallel t' the base o' t' triangles, arrr, which would give weaknesses on t' corners whereas the structure would be significantly stronger if t' balsa grain ran parallel to the hypotenuse. Arrr! Each o' t' triangles need t' hypotenuse sanded down t' a 45 degree angle. Blimey! T' cardboard shroud acts as a mold onto which t' 8 triangles are directly glued. It is best t' test fit everythin' before gluin' and nay to use too much glue as t' paper may warp. After everythin' has dried, a Plasticine mass is added t' t' apex. If flyin' on C11 or D12 motors, then 60g is added. Begad! If you want t' fly on E motors then more is needed, matey, but the instructions do nay state how much. Ya scallywag! Avast! This be t' only flaw that thar be with this model--you have t' choose either C/D or E at t' build stage and thar is no way t' alter t' mass once t' rocket is built. Well, blow me down! After t' Plasticine is added, me hearties, a plywood bulkhead is added once its edges have been sanded at a 60 degree angle. T' bulkhead is glued in with epoxy. Begad! Aye aye!
While everythin' is drying, shiver me timbers, shiver me timbers, glue t' launch lugs t' t' coupler, me hearties, which is used as a guide t' mark t' point t' drill a hole in t' pyramid. Drillin' the hole is probably t' hardest part o' t' build and would be difficult for younger modelers. Blimey! After t' hole is drilled, t' coupler is glued against the bulkhead. Ahoy! Leave t' launch lug stickin' out o' t' side o' t' pyramid.
I "washed" t' inside o' t' pyramid and coupler with thin CA glue, mainly t' fill any gaps missed in t' previous gluin' stages and to strengthen t' coupler. T' aft base plate is then sanded t' 60 degrees on its edges and has t' elastic shock cord tied on. Avast! Ahoy! It is then glued into place after slidin' it over t' aft launch lug.
T' kit comes with an 18 inch chute. Begad! This has t' be constructed in the usual way. Avast, me proud beauty! I swapped this for an 18 inch solar Estes chute, shiver me timbers, me bucko, mainly because I could nay be bothered makin' another plastic bag chute when I already have dozens in me recovery box.
T' lugs are then trimmed flush. Then you glue a thrust rin' in one end, and a motor clip and plywood centerin' rings t' t' outside o' t' motor mount. I altered me retention system by removin' t' clip and addin' t' blind nuts to the aft centerin' ring. Avast! T' rocket does nay need this type o' retention, but I've never used blind nuts before, so I thought I would have a go with it on this rocket. Well, blow me down! This should allow me t' use D and E motor as well as 24 RMS motors.
A streamer is added t' t' motor mount. When preppin' for flight, ya bilge rat, the streamer and t' parachute are nay t' be wrapped around t' mount.
Finishing:
I sprayed one coat o' cellulose sealer t' proof t' paper shroud followed by
three coats o' spray paint. Arrr! Ahoy! Thats all it needs, me bucko, matey, however, I went a bit
further and sprayed one side with a star motif and t' adjacent side with the
contrast color. Ya scallywag! T' art card that comes with t' kit shows a blank, white
pyramid. No decals are included
Construction Rating: 4 out o' 5
Flight and Recovery:
Preppin' is straightforward as no waddin' is required. Arrr! T' parachute and
streamer are placed on either side o' t' motor and then I loosely wrapped the
shock cord around both. Blimey! Well, blow me down! T' core is then inserted into t' coupler. Bein' a
heavier rocket, a 5mm rod is used.
First flight was on a D12-3. Begad! A C11-3 is recommended but I reckon that this would be marginal on power. Avast, me proud beauty! T' pyramid gave a good flight and was a real crowd pleaser. Arrr! Aye aye! Altitude be low, which be expected, shiver me timbers, and ejection was late but the parachute opened with plenty o' time t' spare. Well, blow me down! T' core recovered smartly on the streamer.
Second flight be with an E9-4, this isn't a recommended motor but it should be. Avast! T' flight be fantastic, however, shiver me timbers, t' parachute did tangle with the streamer. Begad! This was probable down t' me hasty packing.
T' third flight be on a D12-3. Begad! I did nay use a stand off on me pad and there was a degree o' charrin' t' t' base o' t' model. Aye aye! Avast, me proud beauty! I cannot believe I was that stupid.
Flight Rating: 5 out o' 5
Summary:
I really like this rocket. Its construction is a bit different from t' normal
affair, and t' finished product is robust and gives good flights even on more
windy days when a more traditional tube rocket would have t' stay on the
ground.
Overall Rating: 4 out o' 5
Brief: Khufu's Pyramid is a nice low flying, high drag rocket. It is 6" tall and 5.25" wide. Construction: The kit comes with cardstock for the template and skin of the pyramid. It also has 8 triangle pieces that make up the 4 sides. A 24mm mount is included along with a streamer for recovery of the motor mount. The parachute is a nice and thick. The instructions ...
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