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No, when I mentioned the part about them only having a spiral-wound version, I was referring to Semroc's BT-30. I started ordering from Estes in 1967, but I don't recall ever seeing the engine mailing tubes (aka BT-40) during that time. My orders used to come in a long box - almost exactly like my orders from Semroc do! - and the engines would come lined up end to end and rolled up in some newspaper, and then packaged in their own little parcel post box, as I recall. I'm not 100% sure about this, though; it was a long time ago, I only had about 3 or 4 orders with them altogether (didn't have much money then) before taking a 30+ year hiatus from the hobby, and nothing that I had from that era has survived (my folks threw away all of my rocket stuff - including live engines! - when I went off to college). Mark K.
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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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#12
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Mark, The engine mailing tubes and the BT-40 were two different animals. The BT-40 was from what I recall leftover stock from MMI. I have some scratch-built rockets here that I bought off of eBay six or seven years ago that have BT-40 tubes and those old, rubber nose cones. This tube had an inside diameter of .765". They had a balsa cone, a plastic skyrocket cone (fit over the outside of the tube) and two rubber cones available for this tube. The BT-40 size derived from the skyrocket size tube if I'm not mistaken. The engine mailing tubes were much larger in diameter and much thicker-walled. Estes only offered one cone for the engine mailing tubes. That was the BNC-MTD. This tube had an inside diameter of .937".
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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 |
#13
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Yes, this is correct. BT-40 is pretty similar to BT-30, much smaller than the mailing tubes. |
#14
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I had always wondered why there was a seam on the inside of a convolute tube and the outside had very little seam. I thought the paper was tapered on the outside edge, but someone recently told me that the final tube was sanded smooth on the outside.
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Carl McLawhorn NAR#4717 L2 semroc.com |
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A-ha! My knowldege of early model rocket history is even sketchier than I thought! I had read about the old mailing tubes, and had also read about BT-40, and had assumed that they were the same thing. I stand corrected. In any event, back in the day I never saw either one. BTW, when I went to build my Li'l Augie (EIRP-10) this summer, the plans called for cutting the augmenter tube out some mailing tube, by which I assumed they meant the engine mailing tube. I thought that I would need BT-40 for that, but it turned out to be the wrong diameter and I ended up using ST-10, which worked fine. Now you have cleared up that mystery for me. Thanks! Mark K.
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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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#16
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Re: Li'l Augie
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With the extra motor in it, space for the recovery system is quite limited. I end up stuffing the shock cord into the hollow plastic nosecone. Doug |
#17
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The little boxes would hold 9 tubes of engines and that's the way I always got them. Supposedly, that was the maximum number of engines that could be mailed in one box. They never came rolled in newspaper. They were always in the mailing tubes. You could buy single motors so maybe if you were only ording 1 or 2 of a specific type they would wrap them in paper. I always ordered them in quantities of 3 because they were cheaper if you bought 3. Whenever I ordered motors, I would order enough to fill one of the boxes. I still have one of those boxes and the postage sticker is from September, 1969 and it cost $.85 to ship. |
#18
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You're right. I think that the most engines that I ever included in an order was 6 - 2 each of three different kinds. Even with the quantity discount, my budget was too meager to allow me to order any one kind of engine in quantities of three. Back then, ordering 27 engines at once would have just boggled my mind. These days, of course, I have a slightly different perspective, and regard a quantity order like that as being merely astonishing. Mark K.
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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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#19
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By 1969 (the box that I still have), I was out of High School and had a full time job and still living at home so rocketry money wasn't a problem. Heck, I bought a brand new Z28 Camaro in 1969 and the car payments were only $55 a month. |
#20
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Cool! Did it have the high output 327 small block in it? My dad was new car manager of a large Chevy dealer here back then. He had a '69 Z28 as a demo that was all tricked out and custom painted. I still remember cruising around in that thing. He'd let me shift it from the right seat. I was all of seven years old.
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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 |
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