C.O.B.H.C.
Well-Known Member
While at XPRS this weekend Aerotech was showing off their new grain spacers.
Don't some AT reloads already effectively use spacers? The D and E loads in the 24/40 and the E and F loads in the 29/40-120 are shorter than the space provided, and they use a short cardboard tube to fill the gap...
Seems like the wrong naming for what they are doing. Don't they space the case in stead of the grains?While at XPRS this weekend Aerotech was showing off their new grain spacers.
Seems like the wrong naming for what they are doing. Don't they space the case in stead of the grains?
Jeroen
I have to agree, If I am understanding this correctly they just added one more piece to the assembly of a reload. since it is being changed internally, wouldn't they have to be re-certified? it seems like they will just be new motors, not the same motors in different cases.
I have to agree, If I am understanding this correctly they just added one more piece to the assembly of a reload. since it is being changed internally,
wouldn't they have to be re-certified? it seems like they will just be new motors, not the same motors in different cases.
I think they need to spend more time getting their delays to be the correct time. this would make some happy customers. at a launch in las vegas last weekend I saw 5 rockets almost destroyed because of early ejection. all
of them went about 3 to 5 seconds instead of the "M" (or 10 seconds) they are advertised at. Nothing worse than destroying a rocket because of a bad delay.
I would agree about that comment expect that the very nature of pryo based delays is there going to be problems some times with them no matter how good company is in making them. Its is the very nature of the beast and how they function.
Still not sure why I see so many fliers risk a expensive HPR rocket by using pyro delays. Electronics is the way to go for most all high power rockets and even some mid-power ones. I will usually even pull a very long backup pyro delay charge out of a motor because it could fail by firing early and destroy a altimeter based bird because of failure. I use almost only plugged forward closures to ensure reliability in reloads.
Folks just say no to pryo based motor delays ! Get a good altimeter (accelerometer or baro based) or two and you never will want to go back to pyro delays. :gavel:
Cheers
John ..
How about an E.F.C. ?
Actually, AeroTech began using grain spacers in 1991 with the development of the RMS-29/40-120 and its smaller model rocket reloadable motors. Also, Wayne Schaffer of Synerjet first demonstrated the use of grain spacers external to the combustion chamber in the early 90's.
AeroTech invented the reloadable hobby rocket motor in 1990. AeroTech continues to be a leader in the development and implementation of new technologies in hobby rocketry. However, we are certainly not beyond adopting new or recycled ideas developed or reintroduced by others that have merit to consumers.
Uhh not quite right! Check your facts. Frank Kosdon made the first reloadable motors available at least a year or so before Gary came out with them. What Gary did was patent them first and Frank never challenged the patent. I know the history was there when they were released and flew them.
Cheers
John ..
Hi John, Gary here. I just got off the phone with Frank K. to check the facts. Frank confirms that he first publicly displayed and sold reloadables during LDRS in Hartsel, CO in 1990, and they were tested on the AeroTech test stand the following February. AeroTech displayed and flew RMS motors at a Black Rock launch a few months earlier, and also sold motors at the Hartsel LDRS in 1990. AeroTech began designing the first reloadables in 1988.
Was Frank responsible for the reloadable motor that we found at the MIT Rocket Society test cell in the late 1970's ? It was rumored to be from the 1950's or 1960's and had an unscrewable aft closure.
Seems like the wrong naming for what they are doing. Don't they space the case in stead of the grains?
Jeroen
I don't know, call them tubes or pipes or whatever you want, YMMV.
How 'bout we just call 'em "thingamajiggers," and be done with it?
-Kevin
Could somebody please supply a URL to information about the thingamajiggers? I don't see anything on the https://aerotech-rocketry.com/ site. Maybe I just missed it... Thanks in advance!
Interesting reading material. The Chuck Mund patent application says it was submitted on 05/03/1991 while the ISP patent application says it was submitted on 05/20/1991. So what determines who was first — who submitted first or who was granted first? I have to imagine the real first was who showed it to the public first, but I don't know how you document that. Maybe it was Hyong Bang like Fred said. All this while, I thought it was Jerry Irvine.Aerotech's patent (1993) doesn't mention any prior patents that sound much like a truly reloadable solid rocket motor.
A patent for a Kosdon-style motor was issued later (in 1994) to Charles Mund. It also doesn't mention any earlier patents for a reloadable solid motor. Interestingly, though, it references an Aerotech ad in Triploi's Tripolitan magazine.
Interesting reading material. The Chuck Mund patent application says it was submitted on 05/03/1991 while the ISP patent application says it was submitted on 05/20/1991. So what determines who was first who submitted first or who was granted first? I have to imagine the real first was who showed it to the public first, but I don't know how you document that. Maybe it was Hyong Bang like Fred said. All this while, I thought it was Jerry Irvine.
Sounds like it's a new product which AeroTech is just starting to show.
I'm betting Gary and company will make an announcement when they're released and available in the market.
-Kevin
Interesting reading material. The Chuck Mund patent application says it was submitted on 05/03/1991 while the ISP patent application says it was submitted on 05/20/1991. So what determines who was first who submitted first or who was granted first? I have to imagine the real first was who showed it to the public first, but I don't know how you document that. Maybe it was Hyong Bang like Fred said. All this while, I thought it was Jerry Irvine.
Enter your email address to join: