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Old 02-11-2019, 09:15 PM
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blackshire blackshire is offline
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Join Date: Jan 2009
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Default "Arci," etc. (links)

Hello All,

Some of you may already have these, but just in case, here https://apps.dtic.mil/dtic/tr/fulltext/u2/630932.pdf is an AFCRL report on the Frangible Arcas. Also, here https://books.google.com/books?id=C...0rocket&f=false is a launch listing for it, and here https://ntrs.nasa.gov/archive/nasa/...19700020646.pdf is a NASA report on it (and on other 30 km – 200 km meteorological rocket systems, including the Skua, MT-135, Cajun-Dart, Kangaroo, Gerald Bull’s gun-launched Martlet projectiles and rockets, etc.). I also found the following items:

The Atlantic Research Corporation Frangible Arcas—and their Arcas, Super Arcas, and Arcturus—all used the same *secant ogive* nose cone (rather than a tangent ogive nose, which has been far more commonly used on model rockets and on full-scale meteorological and sounding rockets). Estes’ BT-55-size Arcas kit used the correct secant ogive nose cone (in both balsa and, later, blow-molded plastic [it’s still included in their BT-55 nose cone assortment; I believe its designation is PNC-55AC]). Rocketarium offers large-scale Frangible Arcas and Arcturus kits, but--to my knowledge--they use incorrect (for these scale models) tangent ogive nose cones. Also:

The above-linked reports contain good drawings of these (and other) meteorological and sounding rockets, including their tail assemblies and nose cones. If these parts were 3D printed in different scales (say, BT-5 or MPC/AVI/Quest T15, and BT-50 and/or BT-55), people could build 13 mm, 18 mm, and 24 mm motor powered scale models of them. In addition:

The British BAJ--Bristol Aerojet--Skua and the (six-finned!) Petrel meteorological and sounding rockets (the Petrel was also used as a simulated ballistic missile target by the Royal Navy) also used secant ogive nose cones, as did the British Fulmar/INTA-300 (these two rockets were virtually identical; they produced the INTA-300 for INTA, Spain’s space agency). (The closed-breech and vented-breech tube launchers that the Atlantic Research Corporation and Bristol Aerojet rockets used, respectively, should also be able to be 3D printed to scale, along with the rockets’ tube-centering fly-away staves.) Below are links to information on these British vehicles (and on the Arcturus and other Atlantic Research Corporation vehicles), which would also make good scale models in different sizes (the Skua is a particularly popular scale subject in the UK, of course :-) ):

Bristol Aerojet (BAJ) Skua: http://www.google.com/search?source... 0.lCbcuVqAvWo

Bristol Aerojet (BAJ) Petrel: http://www.google.com/search?ei=zSN...i30.Jt-eORD-Tgo

Bristol Aerojet (BAJ) Fulmar: http://www.google.com/search?ei=JiR...3.81 RhoI6tZ8Y

Bristol Aerojet (BAJ) INTA-300: http://www.google.com/search?ei=wCR...i30.SkVbC61UYF0

Atlantic Research Corporation Arcturus: http://www.google.com/search?ei=9yR...i30.qRhh1eLrPfk

Atlantic Research Corporation Frangible Arcas: http://www.google.com/search?ei=NSV...i30.PMDxjxnGdkE

Atlantic Research Corporation Super Arcas (a “stretched” Arcas): http://www.google.com/search?ei=qCV...i30.HHI1ex5nVME

Atlantic Research Corporation Arcas: http://www.google.com/search?ei=-SV...i39.F8fotEFSnVc

I hope this information will be useful.
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