Wanting to clone a NCR SA-14 Archer XL, actually a downsized BT80 version.
Does anyone have plans for this rocket? If not, anyone have a built one they can take some outside dimensions of? Fin dimensions, OA lgth, BT lgth, etc..?

Thanks,
JW

I do. Love mine! Hardly a launch where I do not take it. What do you need?
Allen

Jetlag, thanks for the reply.
Looking for the overall dimensions of the fins and strake fins, body tube length, nose cone length, position of strake fins from the end of the body tube.

I take it from the old catalogs it is 4" diameter.

On the fins, measurements of the roots, tips, span, and offsets of the angles should be sufficent to reproduce the design.

Once I get some overall dimensions, I can model it up in CAD to design a clone, either 1:1 or a downscale version.

Thanks,
JW

I'll get them for you in the am, JW! Need pics of it as well? I still have all the old instructions, also.
Allen

Allen, Allen, Allen. If you can scan those, I'd like to get a copy of all that stuff as well, if you don't mind.

__________________
Don
NAR 53455
"Carpe Diem"

Allen, that would be great.
Don't need pics.
A scan of the old instructions would be excellent.

Thanks!
JW

If you contact Matt Steele here via PM (ManOfSteele), I'm fairly certain he'd help you out in getting you the info you need for re-creating an NCR SA-14 Archer. I know that he's helped others out in the past with these types of requests. At this time he does not want NCR plans posted publicly.

__________________
Scott D. Hansen
Ye Olde Rocket Shoppe - Your One Stop BAR Shoppe!
Ye Olde Rocket Plans - OOP Rocket Plans From 38 Companies!
Ye Olde Rocket Forum
WOOSH NAR Section #558

The NCR Archer has 2 BT's : Top one is 16.5 inches long, bottom one is 25 and 5/8 inches long. The nose cone is a 4:1 Ogive and is 16 inches long, not including its 4 inch long shoulder. The strakes are 16.75 inches long at the root, 15 inches long at outer length, 2 inches wide, and 1/4 inch thick balsa. They are mounted even with the main fins, 8 inches from the rear of the BT. I enclosed a sketch of the lower fin dimensions below, along with some pictures. The lower fins are mounted flush with the rear of the BT. The BT diameter is about 4 inches (inner diam. is less than that, of course).
The graphics should be fairly easy to duplicate from pictures.
PM me if you need a copy of the instructions; Scott (and Matt Steele) really prefer I not post the instructions here. However, I can answer your questions about my NCR Archer.
Allen

My sketch of the lower fin is too large a file when my scanner scans it. I've tried posting a picture of the sketch.
Also, I used an Aerotech 29mm motor mount, as the NCR mounts were somewhere around 28mm, to fit their own F62-4 and G70-5 Dark Star engines. I never saw the G70-5, but owned quite a few F62's. Still have one somewhere . Launches are most successful using AT G80-4's (or the newer G77 or 79's). 36 inch nylon 'chute.

Attached Thumbnails

                   

Allen,
Thanks for the info!

Scott,
No problem, I can respect someone's propertary information.

JW

The original pre-Estes Archer was a cluster with a center 29mm and two 24mm. The tube was also a single piece of 34" LOC 3.9 tubing. You really needed to add nose weight to make it stable especially on cluster flights. I used to fly mine with an AT G-42 and airstart two D11-9's. I may fly it in two weeks with an Ellis G37 and two D12's.

__________________
Quando Omni Flunkus Moritati