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Model Forum / General / Rockets / December 2004[F-FT] Another round of RMS questions
Launched my 24mm RMS again today, this time with an F engine reload kit. Had a heck of a time with the Copperhead, but I was given a dipped igniter that worked great. Upon cleaning the casing, I noticed that there was a burn-through spot on the liner, and that it had scorched the inside of the case at that spot. Is it normal to have the liner burn through? Is this something I should worry about? If not, do I need to do anything more to clean that spot on the inside of the case? Also, I got to thinking about where the burn-through was in relation to the C-slot of the grain itself. Has anyone every done any experiments in this regard? In future, I'm going to try to remember to draw a line on the liner where the slot is, so that I can analyze any other problems in relation to the slot position. Anyone have further suggestions on getting Copperheads to work? Or instructions on how to roll-your-own igniters? Or some alternate source to purchase better igniters? David Erbas-White > Launched my 24mm RMS again today, this time with an F engine reload > kit. Had a heck of a time with the Copperhead, but I was given a dipped > igniter that worked great. Rocket Friends are great , are they not ! > Upon cleaning the casing, I noticed that there was a burn-through spot > on the liner, and that it had scorched the inside of the case at that spot. > > Is it normal to have the liner burn through? Is this something I should > worry about? If not, do I need to do anything more to clean that spot > on the inside of the case? It happens, just clean it. > Also, I got to thinking about where the burn-through was in relation to > the C-slot of the grain itself. Has anyone every done any experiments > in this regard? In future, I'm going to try to remember to draw a line > on the liner where the slot is, so that I can analyze any other problems > in relation to the slot position. Most reloadable motors are not sloted, most are cored Bates Grains in the larger motors. The smaller model rocket sized RMS are c sloted to keep the thrust long burn. > Anyone have further suggestions on getting Copperheads to work? Or > instructions on how to roll-your-own igniters? Or some alternate source > to purchase better igniters? Get QuickBurst ignitors pre made, or make you own with an Ignitorman kit. Copperheads are known in the field as crapperheads. You can try burning the clip end with a lighter to seperate the halfs and make it easier to get a clip bite on them. I've seen one guy at our club have 16 failures in one day with them, but since they are free, he keeps on going with them. > David Erbas-White > > [quoted text clipped - 6 lines] > > Definitely, and I try and help out where I can, as well! >>Upon cleaning the casing, I noticed that there was a burn-through spot >>on the liner, and that it had scorched the inside of the case at that [quoted text clipped - 34 lines] > > The QuickBurst website is not responding, are they still around? And is the Igniterman kit the "Hellfire" kit? Thanks. >Copperheads are known in the field as crapperheads. > Yes, I know, and am learning why... <G> >You can try burning the clip end with a lighter to seperate the halfs and >make it easier to get a clip bite on them. > Haven't had a problem with the connection (using the Aerotech clip), and have good continuity, just can't get the darn things to light (sometimes). >I've seen one guy at our club have 16 failures in one day with them, but >since they are free, he keeps on going with them. > > Well, I wouldn't say they are free, but... <G> I'd be happy to use them if they were more reliable, but I'm getting a bit frustrated. I've tried the trick of scraping the edges, etc., but went through three igniters without one working before I was given the dipped igniter (which obviously worked flawlessley). I'm also seeing about something Aerotech has called 'FirstFire' igniters. Any comments about these? David Erbas-White >>David Erbas-White >> > > > I'm also seeing about something Aerotech has called 'FirstFire' > igniters. Any comments about these? Well, other than the fact that they're $10 for a pack of three??? (GEEESHH!) David Erbas-White The igniters I hand out at the SCRA launches are Magnelite pyrogen. They sent a free starter set to club reps who responded to a message about availability of a free starter set. It came with the pyrogen mix and a few sets of wires that you could dip. The logic of the free set is that you will either buy more sets of wires or tell many others about the fine product. This product is FANTASTIC. I make my own wire sets and dip them. Different sizes and lengths for the wide variety of Model Rocket motors that I see at our SCRA launches. I use super thin 'wire-wrap' wire with 32 or 34 ga. nichrome for thin igniters and I use 'bell wire' with the same nichrome for larger nozzles. You can even remove the insulation from one bell wire lead to make it smaller.  Signature-Fred Shecter remove zorch two places to reply Current eBay auctions: http://search.ebay.com/_W0QQgotopageZ1QQsassZshreadvectorQQsorecordsperpageZ25QQ sosortorderZ1QQsosortpropertyZ1 > >> I'm also seeing about something Aerotech has called 'FirstFire' igniters. [quoted text clipped - 4 lines] > > David Erbas-White > Launched my 24mm RMS again today, this time with an F engine reload > kit. Had a heck of a time with the Copperhead, but I was given a dipped [quoted text clipped - 6 lines] > worry about? If not, do I need to do anything more to clean that spot > on the inside of the case? It happens, especially with the paper liners on the small motors. (The phenolic liners used on some of the larger motors seem to hold up better.) The worst effect seems to be local discoloration of the bore... just be sure to scrub carefully to get rid of any baked-on residue at that point, and the casing should be OK. -dave w derbas wrote: << Is it normal to have the liner burn through? >> Yeah, it's pretty common. Just clean the scorched spot. As long as it doesn't produce a bulge in the case, it's nothing to worry about. |
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