>>>It was also my first attempt at staging. I subsequently CHAD-staged an
>>>ultra-stable scratch design with a D booster on the bottom and an E on
>>>the top. Worked fine, despite the E being a single-stage motor.
>> Forgive me for being stupid and/or naive, but I thought the only
>> difference between an 'upper stage' and 'single stage' motor (at least
>> for Estes motors) was the delay. Upper stage motors have a longer
>> delay than single stage motors, I suppose to allow the upper stage to
>> reach apogee before ejecting. I didn't think there was any difference
>> in the nozzle size...
>That's what I thought also, which is why I included the story about
>CHAD staging an E.
Beside the delay time, the Estes upper stage engines have a purple
label vs the green label on the single stage engines, plus the upper
stage engines will weigh a little bit more due to the extra delay charge.
As far as engine thrusting goes it should be the same be it a B6-0,
B6-2, B6-4 or B6-6 (in theory at least).
For the Estes E engines, they never made a kit that had an upper
stage that need an E engine. If it did then they would have made
the E15-8 an 'upper stage' engine in terms of the label.
>In my examination of _my_ Mini-Cobra after the sudden severe shortening
>of the upper stage (BONK!) was that the A10-0Ts were a bit iffy in
>igniting the upper stage. If you look in an A10-0T, the propellant is all
>at the bottom and there's a big gap between it and the upper stage. In my
>case, it looked like flaming chunks that should have ignited the upper
>stage simply missed the hole in the nozzle.
Not much experience with staging T engines so I don't know what I can
add to this.
>The other fellow says he's done some experiments that say there's some
>sort of difference between single-stage engines and upper-stage engines.
>I thought the only difference was in the delay.
Longer delay charges will have more inital weight to them. Just check
out the weight listings for the B6 series of engines.
I also doubt that the size of the nozzle is a factor in the single
stage/upper stage engines. I know the width of the nozzle determines
the thrust of an engine (check on the nozzle widths on the B4,B6 and
B8 engines from Estes).
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