#11
|
||||
|
||||
Quote:
1.25" x 1.34" LT-125 (ST was my error) cites: http://www.oldrocketforum.com/showp...529&postcount=8 LT-125 http://www.semroc.com/Store/Products/BodyTubes.asp Series 125 LT-12580 1.250" 1.340" 8" 0.045" 0.72 oz 3 oz. $0.00 LT-125300 1.250" 1.340" 30" 0.045" 2.70 oz 18 oz. $0.00 |
#12
|
||||
|
||||
So Jerry, what were the defects? If we're 3d printing a fin can, it seems like that's the time to fix the defects. What exactly did Lee say?
And thanks for the tip on the Eliminator, Teflon but $40 is a little steep for a fin can and as I have no use for purple tubes and ugly stickers, I'll pass.
__________________
NAR 79743 NARTrek Silver I miss being SAM 062 Awaiting First Launch: Too numerous to count Finishing: Zooch Saturn V; Alway/Nau BioArcas; Estes Expedition; TLP Standard Repair/Rescue: Cherokee-D (2); Centuri Nike-Smoke; MX-774 On the Bench: 2650; Dream Stage: 1/39.37 R-7 |
#13
|
||||
|
||||
I could easily print a scale coupler for the heavy wall LT-125 (or any other tubing size) in red ABS (similar properties to polystyrene) if you are interested. I could also print the nose cone for LT-125 in ABS plastic. PM me for details. It looks like LT125 is a heavy wall version of Centuri ST-13 tube.
Incidentally, that purple color on the Estes Eliminator tubes can be sanded off very easily and the tubes re-painted in any color. My friend Andrew did that for the Estes Pro Series Prowler kit and it came out looking great; he just couldn't fly a hot pink rocket! I am also interested in the flaws of the 1340 fin can as these might be easily corrected during 3D printing. One option might be to print the fin can with slots to accept wood or fins made from some other material like G10.
__________________
Bruce S. Levison, NAR #69055 |
#14
|
||||
|
||||
Quote:
Lee said the fin units had too many stress risers like the transition from the strake to the fin should have had a small curve. The launch lug was a bad idea in hindsight. He would have made it incrementally thicker although still with the draft. The leading edge of the unit gets chipped easily and pulls from the mold irregularly. Curve that with a small radius. Tech Jerry |
#15
|
||||
|
||||
Quote:
Teflonrocketry1: If you like, I can send you a fin can from an unopened Maniac kit for you to copy, and make any 'improvments.' I would like a coupler for an LT-125 tube. Let me know the cost. I have the stuff to make a 1340.
__________________
Enjoy life, it has an expiration date. |
#16
|
||||
|
||||
Rocketflyer,
I have a fin can from an Estes Eliminator kit that I measured. Is this part much different that the fin can from the Maniac kit? I measured the fins as being 1/32 of an inch thick, this may be very difficult for my 3D printer to handle. Once I have a suitable 3D drawing for the fin can I was planning on giving the 3D print a try. My first pass drawing with fillets on the fins had some holes in it when I attempted to create a file for the 3D printer so I will have to go back and make some significant corrections/modifications. I can easily make the transition for the LT-125 tubing (1.34" OD and 1.25" ID) with a 0.25 inch band in the middle and my take on a sturdier shock cord mount in red ABS plastic (similar to polystyrene). Do you need the nosecone? I have already 3D printed several 1340 nosecones and transitions for Centuri ST-13 tubing which eRockts seems to have in stock; all their LT-125 tubing is listed as discontinued.
__________________
Bruce S. Levison, NAR #69055 |
#17
|
||||
|
||||
Quote:
I am not sure what speed the fins could handle but if you made the whole unit about 1/16-3/32" thick, that might be a good start. Since it obviously is not an original part, it only has to look like it. Jerry Last edited by Jerry Irvine : 04-28-2019 at 02:46 PM. |
#18
|
||||
|
||||
Quote:
Teflonrocketry: As near as I can tell, the fin cans are alike. Let me know cost of coupler/transition and nose cone. Paypal work for you? Thank you!
__________________
Enjoy life, it has an expiration date. |
#19
|
||||
|
||||
Quote:
PM sent!
__________________
Bruce S. Levison, NAR #69055 |
#20
|
||||
|
||||
Quote:
Jerry |
Thread Tools | Search this Thread |
Display Modes | |
|
|