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Showing results 1 to 25 of 500
Search took 0.16 seconds. Search: Posts Made By: Doug Sams |
Forum: Model Rocket History
Today, 11:15 AM
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Replies: 70
Views: 1,460
Posted By
Doug Sams
Greg,
I don't have time right at the moment to...Greg, I don't have time right at the moment to create one, but here's a graph I created using the NAR cert docs and the old Estes catalog curve (for the B14). The B14 curve is pretty simple. I... |
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Forum: Ask the Doctor
Today, 10:41 AM
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Replies: 9
Views: 107
Posted By
Doug Sams
I like to tape the instructions down to the table...I like to tape the instructions down to the table top and build on top of them. It keeps them from getting taken by the wind. I split the 3-packs into three zip-lock snack baggies (before heading... |
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Forum: Model Rocket History
Yesterday, 09:21 AM
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Replies: 70
Views: 1,460
Posted By
Doug Sams
It's not high thrust (which I would definitely...It's not high thrust (which I would definitely prefer), but it's not bad. In BT-60-ish rockets, it's great, and can go in bigger ones, if build light. It rocks in a Big Bertha or Big Betty. As you... |
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Forum: Model Rocket History
07-27-2010, 07:42 PM
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Replies: 70
Views: 1,460
Posted By
Doug Sams
I ran the numbers using the cited NAR doc. ...I ran the numbers using the cited NAR doc. Integrating the curve, the average thrust would be in the range 12.1 to 12.2N (depending on just exactly where the cutoff is). The total impulse would be... |
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Forum: Model Rocket History
07-27-2010, 11:44 AM
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Replies: 70
Views: 1,460
Posted By
Doug Sams
I think that's the key. Anything other than 70mm...I think that's the key. Anything other than 70mm can present major stumbling blocks to noobs and novices, which comprise much of the market. But, addressing the die hards, such as us YORF denizens,... |
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Forum: Model Rocket History
07-27-2010, 10:55 AM
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Replies: 70
Views: 1,460
Posted By
Doug Sams
Ya know...the "standard size" paradigm...Ya know...the "standard size" paradigm is very limiting as regards creativity and innovation. I don't know why they are stuck on 70mm long cases (for 18mm motors), or on paper cases for that matter. ... |
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Forum: Vendors
07-26-2010, 12:05 PM
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Replies: 9
Views: 165
Posted By
Doug Sams
I had the same problem with my replacement...I had the same problem with my replacement Cherokee-3D nosecone. I turned one out of cedar and later discovered it was too loose on the tube. I could have wrapped it with some tape and gotten a good... |
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Forum: Projects
07-24-2010, 05:03 PM
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Replies: 22
Views: 328
Posted By
Doug Sams
No, it's fake. I used ~silver fine-line trim tape...No, it's fake. I used ~silver fine-line trim tape to create the demarcation. It in fact is intended to fly on a 38mm Sky Ripper hybrid J motor, but I may use an APCP motor for the first... |
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Forum: Projects
07-24-2010, 03:46 PM
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Replies: 22
Views: 328
Posted By
Doug Sams
Avenger lawndarts, downscales and upscales...Where's Gary Briggs on this thread? I remember him lawndarting a beautiful Avenger out in Rockwall, Texas a few years ago. It was a major bummer. I felt heart broken and it wasn't even my rocket... |
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Forum: Projects
07-24-2010, 11:56 AM
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Replies: 14
Views: 180
Posted By
Doug Sams
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Forum: Projects
07-24-2010, 11:32 AM
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Replies: 14
Views: 180
Posted By
Doug Sams
Ah! That makes sense. The motor case would be...Ah! That makes sense. The motor case would be too expensive to include with every kit. Doug . |
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Forum: Model Rocket History
07-24-2010, 11:17 AM
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Replies: 70
Views: 1,460
Posted By
Doug Sams
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Forum: Projects
07-24-2010, 11:13 AM
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Replies: 14
Views: 180
Posted By
Doug Sams
Question (for Leo or anyone else): It looks like...Question (for Leo or anyone else): It looks like a cold power kit consisted largely of a conventional balsa/paper model rocket with the key differences being in the cold power motor (sort of... |
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Forum: Projects
07-23-2010, 09:37 PM
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Replies: 6
Views: 101
Posted By
Doug Sams
Speaking of this....has anyone seen this bird...Speaking of this....has anyone seen this bird with the box-art fins? Or do they all have the Alpha style fins? Doug . |
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Forum: Model Rocket History
07-23-2010, 01:25 PM
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Replies: 70
Views: 1,460
Posted By
Doug Sams
They should. As I understand it, the only...They should. As I understand it, the only difference between the B14 and the B3 was the metric versus imperial units designation. 3*4.45~=14. At some point, the thin walled casings took over. Not... |
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Forum: Model Rocket History
07-23-2010, 10:01 AM
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Replies: 70
Views: 1,460
Posted By
Doug Sams
That's kinda how I'm thinking, too.
But note...That's kinda how I'm thinking, too. But note one key diff: The narrow bore B14, which looks much like the B8, is still deeper, 0.75" versus 0.6". It has the same depth as the bigger bore B14's. ... |
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Forum: FreeForAll
07-22-2010, 09:43 PM
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Replies: 15
Views: 336
Posted By
Doug Sams
I just use my kids. My stores allow one coupon...I just use my kids. My stores allow one coupon per person, so I take a couple kids with me and load up :) Doug . |
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Forum: Model Rocket History
07-22-2010, 08:37 PM
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Replies: 70
Views: 1,460
Posted By
Doug Sams
Here it is: (The dimensions are nozzle...Here it is: (The dimensions are nozzle depth.) http://www.doug79.com/motors/B14-vs-B8-3.jpg And here's a close-up: http://www.doug79.com/motors/B8-B14-closeup-p.jpg Doug . |
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Forum: Model Rocket History
07-22-2010, 01:30 PM
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Replies: 70
Views: 1,460
Posted By
Doug Sams
I have seen some later B14's that looked more...I have seen some later B14's that looked more like B8's - they didn't begin to have the larger cores seen on the earlier B14's. It wasn't clear to me if this was due to worn out drills, substitution... |
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Forum: FreeForAll
07-22-2010, 09:42 AM
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Replies: 47
Views: 733
Posted By
Doug Sams
I guess I do the unmanly thing - when I pay for...I guess I do the unmanly thing - when I pay for something, I reach in my right, front, pants pocket, grab a handful of change, and see if I can do anything to reduce the mass of metal in my pocket.... |
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Forum: Model Rocket History
07-21-2010, 08:33 PM
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Replies: 70
Views: 1,460
Posted By
Doug Sams
I think that's essentially the B8/C5.
My take...I think that's essentially the B8/C5. My take is that for the more aggressive (steep) core of the B14, if you tried to merely ram it, that you wouldn't get the powder to pack tightly around the... |
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Forum: Vendors
07-21-2010, 11:59 AM
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Replies: 15
Views: 420
Posted By
Doug Sams
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Forum: Vendors
07-21-2010, 10:26 AM
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Replies: 20
Views: 527
Posted By
Doug Sams
No, but it used to :)
Speaking of that...who...No, but it used to :) Speaking of that...who remembers Billy de Wolfe? When I was a little kid, it sounded like "Billy the wolf" :D In later days, I always thought William Daniels, as Dr Mark... |
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Forum: Vendors
07-21-2010, 09:43 AM
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Replies: 15
Views: 420
Posted By
Doug Sams
I guess it's a semantics thing... But in the...I guess it's a semantics thing... But in the context of economics, a rocket motor is a durable good rather than a service, etc. Didn't they teach econ at Cal Tech? :D Doug . |
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Forum: FreeForAll
07-21-2010, 09:38 AM
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Replies: 36
Views: 372
Posted By
Doug Sams
When I was a kid, my dad's uncle had a junk yard...When I was a kid, my dad's uncle had a junk yard of sorts, much like Fred Sanford's, but not as lucrative :rolleyes: (He was sorta the poor, white trash version of Fred :)) Anyway, I remember my... |
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