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I had a course in Electrodynamics with a Physics Professor who was a terrible alcoholic -- a brilliant man when he was young, but his brain had been fried by alcohol abuse. University eventually forced him into ReHab, which he completed, but died six months later. Of course, we callow Undergrads...

It is the other way about, that the algebra requies explanation.

I do apologise for this very-late follow-up message, but a great deal of misfortune intervened: my US Army veteran diabetic brother's leg was amputated, and our mother died. My best friend's sister and mother also died, so I gave away the "Rock Star" kit, knowing we would have no time to devote.

I sold my guns a few years ago, because I just wasn't shooting any more. My old customised Mossberg 500 "Street Sweeper" went to my brother in California; and my RIA replica 1911 to an old friend in Colorado, who insisted upon giving me $50 more than I was asking because of the case, the good...

I received an e-mail from Internet Archive Newsletter today that 55 old Estes catalogues have been uploaded to their website for all to peruse.

Very true : in the late Nineteenth Century, boiler explosions were a major concern, mainly on locomotives. Even so, John's point is well made : water is not explosive.

I received the "Rock Star" kit (very interesting) from FlisKits, thinking of obvious modifications, chiefly among which is air augmentation. Soviet rocket experimenters worked on this fifty years ago, anything since then?

Nice work, John, especially on the graphics. Physics can be a tough sell, I know — I've been teaching college Physics since I retired in 2009 — and maybe you could explain to readers that "ma" means mass m multiplied by acceleration a, because (in my experience) a lot of them don't remember (or...

Thanks again for all the advice, which I have been reading & heeding. Today I ordered a "Rock Star" from FlisKits, for which I'll get some C11-5 motors and maybe take to the Tripoli launch in Jean (Nevada) next month, about 30 miles south of where I'm sitting now.

Thank you for the good advice, sorry for the tardy response, we have a lot of reading and research to do.

I've been an occasional college lecturer for many years (when not busy doing scientific work) and this is the explanation I give my Physics students: Machine: a device used to transfer energy — for example: a rock, stick, or can-opener. Engine: a clever device for transforming one type...

I retired from scientific work (mostly instrumentation) in 2009, and my best friend (since 1971) is interested in model rocketry. He has no knowledge of Science (he works in a Law office) but has practical experience with machinery from his upbringing on a dairy farm. He lives in Henderson...