#11
|
||||
|
||||
No more Estes in WalMart - one of the things that changed when Hobbico bought Estes-Cox.
We should probably return to Semroc stuff seeing as this IS the Semroc forum and Blackshire's original intent was to alert folks to a very usable and yet very inexpensive launcher for Semroc rockets .
__________________
Bernard Cawley NAR 89040 L1 - Life Member SAM 0061 AMA 42160 KG7AIE |
#12
|
||||
|
||||
I like the quick little launches in that Moon Mutt video. They are actually rather cute, and I mean that in a positive way. Darn, I'm going to have to dig mine out and start launching it now. See what you've done!
__________________
Mark S. Kulka NAR #86134 L1,_ASTRE #471_Adirondack Mountains, NY
Opinions Unfettered by Logic • Advice Unsullied by Erudition • Rocketry Without Pity
|
#13
|
||||
|
||||
Quote:
A Semroc launch controller could be offered as a kit (as the Estes FS-5, Astron, and Solar Launch Controllers all were). The cabinet could be a standard aluminum or plastic electronic project housing box (Centuri's "Professional Firing Panel" and "Ignition Control Panel [see: http://www.ninfinger.org/rockets/ca...65/65cen18.html ] were similar to this--in fact, their aluminum cabinets may have been electronic project housing boxes). Like the FS-5 and Astron launch controllers, this new Semroc "LEK-TROL" launch controller could operate off either a 6 volt heavy-duty lantern battery or a 12 volt car (or motorcycle) battery. An RCA (Phono) plug (or a 1/4" TRS mono audio plug) with its two conductors shorted together could serve as the safety key, which would be plugged into an RCA (or TRS mono) jack in the launch controller cabinet to arm the circuit.
__________________
Black Shire--Draft horse in human form, model rocketeer, occasional mystic, and writer, see: http://www.lulu.com/content/paperba...an-form/8075185 http://www.lulu.com/product/cd/what...of-2%29/6122050 http://www.lulu.com/product/cd/what...of-2%29/6126511 All of my book proceeds go to the Northcote Heavy Horse Centre www.northcotehorses.com. NAR #54895 SR Last edited by blackshire : 08-02-2011 at 03:45 AM. Reason: This ol' hoss done forgot somethin'. |
#14
|
||||
|
||||
Also, that's gotta be about the highest 1/2A flight that I have ever seen!
__________________
Mark S. Kulka NAR #86134 L1,_ASTRE #471_Adirondack Mountains, NY
Opinions Unfettered by Logic • Advice Unsullied by Erudition • Rocketry Without Pity
|
#15
|
||||
|
||||
Quote:
__________________
Black Shire--Draft horse in human form, model rocketeer, occasional mystic, and writer, see: http://www.lulu.com/content/paperba...an-form/8075185 http://www.lulu.com/product/cd/what...of-2%29/6122050 http://www.lulu.com/product/cd/what...of-2%29/6126511 All of my book proceeds go to the Northcote Heavy Horse Centre www.northcotehorses.com. NAR #54895 SR Last edited by blackshire : 08-02-2011 at 03:56 AM. Reason: This ol' hoss done forgot somethin'. |
#16
|
||||
|
||||
I propose that we retire the phrase "Estes dent" and substitute something more generic, like "balsa smile" since the phenomenon is hardly unique to Estes rockets, or even, for that matter, to LPR.
Bernard, I have seen this happen on rockets with long elastic shock cords. It occurs when the cord gets tangled up, even temporarily, and thus made effectively too short. The nose cone can snap back and strike the top of the tube if a short section of the cord just below the cone is loose while the remainder is coiled up in the tube; the nose cone and the free section of cord are ejected first and the cord stretches and snaps back before the coiled length is even pushed out of the tube. The solution is to substitute regular poly cord or even Kevlar for most of the shock cord length except for a short section where it emerges from the tube. The short section of flat elastic spreads the load out against the lip of the tube to help prevent zippers, and it provides enough shock absorption to soften the sharp ejection event without storing so much energy that it pulls the nose cone right back to the lip of the tube. By the time that the elastic shortens again, so much non-stretching cord above it has been paid out that it cannot bring tube and nose cone back together again when it recoils. The short section of elastic can only stretch so far and therefore it can only store so much energy; that energy is much less than that of a full length of elastic. You get the advantages of a shock-absorbing tether while avoiding the disadvantages of a cord that can forcefully recoil along its entire length.
__________________
Mark S. Kulka NAR #86134 L1,_ASTRE #471_Adirondack Mountains, NY
Opinions Unfettered by Logic • Advice Unsullied by Erudition • Rocketry Without Pity
|
#17
|
||||
|
||||
Quote:
Interesting about this.... the three new RTFs, for which the 1/2A3-4T IS recommended, are all heavier than that - ranging from 0.69 to 0.74 ounces. And based on the one 1/2A3-4T flight I have on the heaviest of the three - it actually is OK - at least under light wind conditions.
__________________
Bernard Cawley NAR 89040 L1 - Life Member SAM 0061 AMA 42160 KG7AIE |
#18
|
||||
|
||||
Quote:
I'm puzzled as to why the Bandito (0.60 ounces without motor) and Firehawk (0.65 ounces without motor) don't have the 1/2A3-4T in their recommended motors lists. (The even heavier EX-200 [0.78 ounces without motor] has the 1/2A3-4T in its recommended motors list.)
__________________
Black Shire--Draft horse in human form, model rocketeer, occasional mystic, and writer, see: http://www.lulu.com/content/paperba...an-form/8075185 http://www.lulu.com/product/cd/what...of-2%29/6122050 http://www.lulu.com/product/cd/what...of-2%29/6126511 All of my book proceeds go to the Northcote Heavy Horse Centre www.northcotehorses.com. NAR #54895 SR Last edited by blackshire : 08-02-2011 at 09:12 PM. Reason: This ol' hoss done forgot somethin'. |
#19
|
||||
|
||||
Would it be possable to launch Flis 1:282 Saturn 1b useing this mini launcher?
|
#20
|
||||
|
||||
Quote:
__________________
Black Shire--Draft horse in human form, model rocketeer, occasional mystic, and writer, see: http://www.lulu.com/content/paperba...an-form/8075185 http://www.lulu.com/product/cd/what...of-2%29/6122050 http://www.lulu.com/product/cd/what...of-2%29/6126511 All of my book proceeds go to the Northcote Heavy Horse Centre www.northcotehorses.com. NAR #54895 SR Last edited by blackshire : 08-02-2011 at 11:48 PM. Reason: This ol' hoss done forgot somethin'. |
Thread Tools | Search this Thread |
Display Modes | |
|
|