#21
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I have a Cherokee-D parts pack that I bought from Thrustline, back when it was still up and running, and I have decals from Excelsior. I'm reluctant to open up the kit now. I may do a clone of it myself instead. (Not logical, I know.)
Mark \\.
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Mark S. Kulka NAR #86134 L1,_ASTRE #471_Adirondack Mountains, NY
Opinions Unfettered by Logic • Advice Unsullied by Erudition • Rocketry Without Pity
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#22
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Quote:
The best starting point for a Cherokee-D these days, if you're going to build a PNC version, is the C-C Express. I have not seen an official 2009 kit list from Estes, but it was still shown in the 2008 catalog. CCX has the PNC-55AC, a full BT-55, and most of the parts for the "D" mount.
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Craig McGraw BARCLONE Rocketry -- http://barclone.rocketshoppe.com BARCLONE Blogsite -- http://barclone.wordpress.com BARCLONE Forum -- BARCLONE Forum BARs helping BARs SAM 0044 AMA 352635 |
#23
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I measured my Bull Pup PNC-55AC against an Estes BNC-55AC. I got a .25" difference. I only have the one balsa NC so I am not sure if the variation is there. I also have a set of Original Decals to use on my clone. As soon as the weather warms up, I will finish it off. Had I known the original was marginal, I would have lengthen the BT, guess I am stuck now with adding a little nose weight. Joe |
#24
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IMHO, the shorter body tube Cherokee-D looks better than the 18" BT version. I've had no stability issues with short version Cherokees from the original up to 4" diameter on "J" EX motors. If you are a little worried about stable flight, just check the CP/CG and add a little nose weight if needed. I've never had to.
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I love sanding. |
#25
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I still have the fin pattern from my original Cherokee from the 70s. Measuring "to the sharps" I get the following: 3.75" (95 mm) for the Root Edge 2.5" (64 mm) for the Leading Edge 2.20" (55.5 mm) for the Fin Tip 2 .18" (55 mm) for the Trailing Edge The pattern must have been made for 3" balsa, as it is a two-piece fin. I scanned it 100% into a PDF (the 1" grids in the background did not show up so well in the BW scan, so I made a grey scale scan too). My original "short tube" flew fine, and I cloned that version. EDIT: here is RS sim image |
#26
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I measured the plastic version, and it was exactly the length given in the BMS catalog for their balsa clone. I have had variations in really old Estes cones, so that might explain your difference. With this one being so pointy, that could be the reason -- easy to lose a 1/4" of a long pointed cone. I visited Estes in 1966, and remember seeing their nose cone machine. I recall taking pictures, but I've only found a few, and none of that machine. I seem to recall the lathe feeding in really long blocks of balsa. I also seem to recall they had a rack of grinding stones, but do not recall the "turning" method. The grinding stone may have given the profile, and maybe a cutter completed the shoulder. I do remember them getting cut off, dropping into a box, and the next cone getting started, all pretty automated. I'd love to know if anyone has pictures of some of those old Estes machines. I also remember seeing Mabel make engines, and the contraptions for making igniters, and wadding from TP (not sure if it was Charmin, or Northern, or maybe Scott? ...)
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Lee Reep NAR 55948 Projects: Semroc Saturn 1B, Ken Foss Designs Mini Satellite Interceptor In the Paint Shop: Nothing! Too cold! Launch-Ready: Farside-X, Maxi Honest John, Super Scamp |
#27
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I remeasured both my nose cones, being a bit more accurate this time. I am about 1/16" of an inch short on my Balsa cone and 1/16" long on my plastic Nose Cone. The 1974 Catalog reports the length at 5 3/8" so I would have to agree with that assessment.
Joe |
#28
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I'm looking to clone about 6 or 7 rockets, some don't have the thickness of the balsa sheets on some. I may have missed it somewhere too, trying to get a list together back and forth from home and work.
What are the average thickness of fins on Estes kits? 3/32, 1/8, 3/16? I'm gonna say normal A,B,C, small D's. The larger rockets like the D-Region I think is 3/16, been forever since I replaced the fin. Or am I 1/16 large on that? This will give me a ballpark figure of what I am looking at. Thanks guys |
#29
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Quote:
BFS-10 = 1/32" BFS-20 = 1/16" BFS-30 = 3/32" BFS-40 = 1/8" BFS-50 = 5/32" BFS-60 = 3/16" BFS-70 = 7/32" BFS-80 = 1/4" The Cherokee-D used BFS-40.
__________________
Craig McGraw BARCLONE Rocketry -- http://barclone.rocketshoppe.com BARCLONE Blogsite -- http://barclone.wordpress.com BARCLONE Forum -- BARCLONE Forum BARs helping BARs SAM 0044 AMA 352635 |
#30
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Craig,
OK, looking at Willie Logans page on discontinued parts, I see that the balsa sheets on the Orbital transport are BFS-20L which looks to be a long piece of Balsa. On the A-20 Demon the balsa sheet lists BF-58. So does this mean it is actually a 5/32" balsa sheet, with the last number representing the length of the sheet Estes used(maybe 8")? So really we look at the first number and see what range that is in to determine the thickness. Am I on the right page?? Nice work you guys have done on the cloning sheets, helps a great deal. |
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