#1
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How about the ol' Egg Crate ?
Can anyone help me with plans for the old Centauri Egg Crate ? I know it's a BT-60 (estes equivelent) body and a BT-70 payload section, but I need tube lengths, and a fin pattern would be REAL nice !
Anyone ? You would have my undying gratitude ! That and $3.75 buys you a latte at Starbucks...... Lee |
#2
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Quote:
The payload section is ST-20 which is larger than BT-70.
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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 |
#3
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I know, but the difference is a little over 1/10 of an inch, not enought to matter to me. What i really need are the tube lengths and a fin pattern.
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#4
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The Centuri Egg Crate is exactly the same as the much newer Estes Eggspress except for the Engine mount and fin pattern.
The Estes kit used a single 18mm engine mount. The Enerjet E/F Eggcrate useda 29mm engine mount. The Centuri Egg Crate used a 3x18mm cluster engine mount. The fin pattern can be found attached below or use the link below. http://forums.rocketshoppe.com/atta...tachmentid=1578
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When in doubt, WHACK the GAS and DITCH the brake !!! Yes, there is such a thing as NORMAL, if you have to ask what is "NORMAL" , you probably aren't ! Failure may not be an OPTION, but it is ALWAYS a POSSIBILITY. ALL systems are GO for MAYHEM, CHAOS, TURMOIL, FIASCOS, and HAVOC ! |
#5
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Quote:
No, you're thinking of the Enerjet Egg Crate. The Centuri Egg Crate was completely different.
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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 |
#6
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Quote:
Scott; I thought ST-20 had an OD of 2.04" while BT-70 has an OD of 2.217". That would make BT-70 bigger.
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John YORF #003 SAM #004 |
#7
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Quote:
Ya, I meant to say smaller.
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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 |
#8
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I do understand that there is some difference in the tube sizes. I mostly want the fin pattern, and tube lengths would be helpful also. if I have to, I'll just wing it !
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#9
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I was browsing egg lofters and ran across the Egg Crate (KC-11) in the 71 Centuri catalog - it struck my fancy. A quick search of the forums led me to this thread, but, alas revealed no plans. So I took a stab at reproducing the model from the catalog
Parts list: Nose cone: Semroc BC-2033 Payload tube: ST-20, 5" length Transition: Semroc BR-1620F Sustainer body tube: ST-16, 10.5" length 3 ST-7 or BT-20 motor tube, 2.75" length 3 Semroc TB-7 thrust Blocks Launch lug: Semroc LL-320 Parachute: Semroc CP-24 Here's the Rocksim 3D image of the rocket: Rocksim file and fin pattern are attached - would appreciate any comments/corrections
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Up next: Under construction: Under repair: In finishing: Centuri Sabre clone In primer: In paint: Ready for decals: Bill Cooke NAR #31312 TRA #19705 SAM #0001 Huntsville, AL My rocket blog My rocket fleet |
#10
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The Mystery of the Egg Crate
I won an Ebay auction with parts to the Egg Crate, and they arrived today:
The chute wadding was an unexpected bonus, but the 1970 A5-4 motor caused me to cringe a bit. Priority mail ain't the way to ship those things Measurements are: Payload tube - ST-20, 5" length Body tube - ST-16, 12" length (note balsa coupler glued in one end - more on this later) Nose cone - 2.5" bezier, exact match to Semroc ST-2026 Fins (I will scan and send in patterns on Monday): Root chord - 3.0" Tip chord - 1.7813" Sweep length - 2.2813" Sweep angle - 45 deg Semi-span - 2.2813" Launch lug stand-off: Root chord - 2.0" Tip chord - 1.625" Sweep length - 0.1875" Sweep angle - 45 deg Semi-span - 0.1875" As you can see there are 2 launch lug stand offs on each sheet. I sincerely doubt this puppy uses all four, but suspect it does use two. I puzzled over the lack of a balsa adapter, and originally thought it had been lost with the instructions, decals, motor tubes, etc. I also could not figure out why there was an ST-16 balsa coupler glued into the body tube and why a paper ST-20 coupler was in the parts. I did some ciphering, and figured out that using a Semroc BR-1620F adapter would put me at least an inch over the rocket length given in the catalog. I couldn't figure out what was up, and had about decided the length was a typo. Then it hit me... I went over to the parts section of the 71 catalog, and noticed there was no balsa adapter to connect a ST-16 to an ST-20 - there was only a paper one, the PR-1620, which had a shroud 1 " long. Mystery solved - I think. The Egg Crate used a paper shroud - seems kinda crazy for an egg lofter - and part of the ST-16 (over an inch) was used in the construction of the adapter. The balsa coupler was then used to connect the adapter+payload section to the body. Length problem solved. Does anyone have any instructions to verify the above (and also to tell me if 2 launch lug stand offs were used)? Pretty please? I am planning to clone this, but may make life simple and use a Semroc BR-1620F - at 1.2", it is a little longer than the PR-1620, but a 10.5" body tube would provide a match to the catalog length. That would save the trouble of constructing a paper one, and eliminate the need for a balsa coupler. Now to work on drawing the decals - looking at the pic on the inside back cover of the 71 Centuri catalog, they consist of a black and red roll pattern, and a couple of lines. Also looks like 2 horizontal strips of silver foil along the egg capsule. Rocksim file with correct fins and using the BR-1620F attached.
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Up next: Under construction: Under repair: In finishing: Centuri Sabre clone In primer: In paint: Ready for decals: Bill Cooke NAR #31312 TRA #19705 SAM #0001 Huntsville, AL My rocket blog My rocket fleet Last edited by Vanel : 09-21-2007 at 07:23 PM. |
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