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Centuri IRIS Nosecone and BT
I recently bought a bunch of old plans and partial kists from ebay. I have most of the parts, fins, etc. for the Centuri IRIS , but need help on the nosaecone and BT length, anyone have those? I wnt looking at JIMZ and YORS but no info on NC and BT.
Does SEMROC have them? Ron |
#2
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I used the BNC-848 and ST-8120 for my clone. Our own SEL provided some notes back in 2003: Quote:
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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 |
#3
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I have a balsa cone version, opened, but unbuilt. Got this one off ebay earlier this year, and while it is 'complete', the body tube was badly damaged and the nose cone some what 'knocked' around (but useable).
The demisions in this kit are fairly similar on the tube, but somewhat different than the earlier post on the nosecone length: BodyTube: 11 9/32 (just a smidge more than 11 1/4) NoseCone: 5 12/32 The tip of my nosecone (some of the 'knocked' around condition) has been damaged, so the very pointy tip is gone, but if 'eyeballed' on out against my steel rule, the missing section would figure to be that last 3/32 of an inch. The real IRIS had a v-e-r-y long tapered nosecone, and the original balsa cone in the Centuri IRIS attempts to replicate this. The plastic cone replacement beginning in the early 70s (as noted by the previous poster) would be somewhat shorter and not quite as tapered as the balsa version. I've attached a couple quick pics of the nosecone and instruction sheet. I have made final arrangements for the receipt of the very first version of this kit (a 1968 vintage kit) and will measure the tube and cone of it when it arrives in a few days. Hope this helps.
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Earl L. Cagle, Jr. NAR# 29523 TRA# 962 SAM# 73 Owner/Producer Point 39 Productions Rocket-Brained Since 1970 |
#4
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Also remember, Centuri was notorious for parts substitutions, and for not absolutely matching their "stated catalog" dimensions over the production life of their kits. As an example, Sean's notes illustrate two different tube lengths, neither of which were catalog-listed items even during Centuri's "glory days". When Centuri changed from balsa to plastic, the length of the nose cone changed. Carl stocks quite a number of turned components to try to match what Centuri offered in their catalogs, but when you have a constantly-moving target, you will never get it 100% accurate. For my clone, I used the closest match of tube and NC to what the kit would have used. If I wanted to get it "spot-on", I would trim the tube length, and still use the BC-848, which is only 0.20" short of the 5" original length (which does not currently exist in Carl's list). Leaving the tube at 12", the final length of the clone is close to the original catalog length.
__________________
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 |
#5
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Yikes!! Was it really 2003? Seems like only yesterday... S. |
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With the 6 mm Quest MicroMaxx motors, it should be possible to equip a Centuri Iris (or the Semroc "Retro-Repro" version of this kit) with a scale version of the finless, "slip-fit," clustered 7-motor Iris booster. (The booster can be seen with the Iris here: http://www.designation-systems.net/dusrm/app4/iris.html and http://www.astronautix.com/lvs/iris.htm ). The full-scale Atlantic Research Corporation Iris sounding rocket was a slowly-accelerating, end-burning vehicle (like the company's Arcas and Arcon rockets) and was launched from the 4-fin tower at Wallops Island, Virginia.
The booster burned out very quickly and separated before the Iris exited the tower, and it flew out behind the sustainer. Depending on the MicroMaxx motors' thrust duration, a scale model of the "full-up" Iris with booster might--or might not--require ballast mass in the front end of the Iris sustainer to make the combined components aerodynamically stable while the booster is attached.
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Black Shire--Draft horse in human form, model rocketeer, occasional mystic, and writer, see: http://www.lulu.com/content/paperba...an-form/8075185 http://www.lulu.com/product/cd/what...of-2%29/6122050 http://www.lulu.com/product/cd/what...of-2%29/6126511 All of my book proceeds go to the Northcote Heavy Horse Centre www.northcotehorses.com. NAR #54895 SR |
#7
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Ron, Did you happen to get the Scale Data that came along with the IRIS kit ? If so, I would really appreciate it if you could scan the data and e-mail me a copy . . . Thanks, in advance ! Dave Ec2cDave@aol.com |
#8
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I have an original and can probably scan it sometime in the next couple days. However, if you want an original one (somewhat pricey), there is one listed as a 'buy it now' on ebay, for something like $14 (told you it was pricey...). But, just in the event you want a pristine one, it's there on ebay (been listed for several months now with no buyers). Earl
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Earl L. Cagle, Jr. NAR# 29523 TRA# 962 SAM# 73 Owner/Producer Point 39 Productions Rocket-Brained Since 1970 |
#9
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Earl, When you get the chance, I would love to get a copy of that from you. That item on ebay is pretty pricey ! Dave Ez2cDave@aol.com |
#10
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Hmmmmm....
Is there scale data out there on the IRIS that goes beyond what's available in Alway's ROTW? I got this pic a while back. I have no idea where it came from, but it is an IRIS at Goddard in Maryland. Greg Last edited by GregGleason : 10-26-2010 at 01:07 PM. Reason: Graphics failed on first try (too big) |
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