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  #91  
Old 11-25-2011, 12:00 AM
Mark+3 Mark+3 is offline
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For reference: the Estes motor shipping tube I have is blue and parallel wound with an
ID (min)~ .92" and an OD (max) ~ 1.04". I'm giving the dimensions as min. and max. due to parallel winding of tube. Were Estes stated dimensions of BT-30 minimum and maximum diameters or average diameters? Min./Max. seems more logical.
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  #92  
Old 11-25-2011, 12:50 AM
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Quote:
Originally Posted by Mark II
From what I have read, Estes motor shipping tubes were just a smidgen larger on the inside than the diameter of the 18mm motors. I would think that it would have been too small to accommodate a 21mm FSI motor.


no, the shipping tubes have to accomodate the instruction sheet as well, which was thin paper, but nearly the size of regular notebook sheet, plus the strip of "astron" igniters. The 18mm motors rattled around easily. Also, IIRC, the packing slip would be rolled up inside if the order was for individual motors, say, a 1/2A.8-4, a B.8-4, and a B3-0 in the same tube.
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  #93  
Old 11-25-2011, 01:49 AM
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Granted, I never saw an Estes motor shipping tube. All of my motor orders from the company were for very small numbers of individual motors, and they were rolled up in newspaper and packed in the box with my kit orders. None of mine were ever in tubes.
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  #94  
Old 11-25-2011, 12:54 PM
dannymrmissile dannymrmissile is offline
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Quote:
Originally Posted by vulcanitebill
This is my memory of it as well. Most of my early flying was about 1965-1969. I built a Ranger back then and launched it with both series I and series II B's. Those were the thick walled engines and a B filled the available space, no room for enough propellant for a C with delay and ejection charge.

I remember when the Big Bertha came out, one of my friends built one. It did have the low and slow majestic flight characteristic, and I wasn't interested in it for that reason. Plus it wasn't very sleek with the blunt nosecone. Nowadays a BB would fly very well on a modern C engine. I'm actually planning to build a BT60 rocket, maybe a Vagabond, to use for D12 motors.

We built models with the BT10 and BT30 tubes in those days. I had forgotten about the BT40 tube but I still have one model made with it, the BT40 is not much bigger than the BT20 motor mount tube. I remember when the BT55 tube came out and I built a scratch built design with it. I thought this was a good tube for a B, slightly faster than a BB.

Estes didn't have C single stage engines back then but at some point in time we discovered FSI engines and they had a C. It was bigger than 18mm, maybe 20mm or 21mm. I tore the motor mount out of my BT55 model and made a motor mount just to fit the FSI engines. Now that I think about it it might have used the BT40 to hold the motor.

As a kid we had made our own launch system using dry cell batteries, so we could carry it out into my grandfather's pasture. When I launched my Ranger we had someone drive us to a different launch site and we used their car battery for power. This is another advantage of a single motor over a cluster.

Just happened to be goin thur my old Bt 40s last nite. Have small bx full & clear payload sections, etc. Were durable & fun indeed. dan.
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  #95  
Old 11-25-2011, 01:12 PM
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Quote:
Originally Posted by Mark II
Granted, I never saw an Estes motor shipping tube. All of my motor orders from the company were for very small numbers of individual motors, and they were rolled up in newspaper and packed in the box with my kit orders. None of mine were ever in tubes.

I built more rockets out of the motor tubes than I ever built from kits. Usually of the one flight variety.
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  #96  
Old 11-25-2011, 05:52 PM
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Quote:
Originally Posted by foamy
I built more rockets out of the motor tubes than I ever built from kits. Usually of the one flight variety.
Oh, so the real terrorists come out (j/k)

Doug...who only fantasizes about horizontal flight...

.
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  #97  
Old 11-26-2011, 03:24 AM
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Quote:
Originally Posted by foamy
I built more rockets out of the motor tubes than I ever built from kits. Usually of the one flight variety.
You must have bought a lot of motors!
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  #98  
Old 11-26-2011, 06:49 AM
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Bought a lot of motors? No, not really. As a kid on a very limited budget, I could buy a kit or a tube of motors. A tube of motors came with it's own essential building block for a rocket. Very conveniently sized. I don't believe I ever let one go to waste. I didn't operate like that all the time and of course, these things weren't works of art, but they did (mostly) fly and I learned a good bit (good and bad). Again, as a kid, when I went out to launch, I didn't come back until I ran out of motors or rockets. Sometimes both.
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  #99  
Old 11-26-2011, 08:32 PM
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How many motors did a tube contain? The most motors that I ever included in a single order were three (or possibly four), and no two were alike. But I never received them in a tube. In fact, I didn't know that Estes had ever packaged motors in tubes until after I brought my model rocketry hobby out of suspended animation in 2004.
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  #100  
Old 11-26-2011, 09:57 PM
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The tubes held three motors. Sometimes an order that had more motors would come as multiple tubes, all separately addressed and with separate postage....bound together with rubber bands.

I don't recall if they put more than three shorties (Series III) motors in a tube or not.
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