#41
|
||||
|
||||
How did I not anticipate a certain someone chiming in claiming they were somehow a copy of something related to a U.S. Rockets product that has been OOP for even way longer ?
__________________
When in doubt, WHACK the GAS and DITCH the brake !!! Yes, there is such a thing as NORMAL, if you have to ask what is "NORMAL" , you probably aren't ! Failure may not be an OPTION, but it is ALWAYS a POSSIBILITY. ALL systems are GO for MAYHEM, CHAOS, and HAVOC ! |
#42
|
||||
|
||||
Quote:
Quote:
The North Coast motors appear to have been very well vetted Doug .
__________________
YORF member #11 |
#43
|
||||
|
||||
Quote:
I will note that while the grain geometry was a precise copy of mine, as were some of the earliest NCR kits (Pearson version not NCRBE), it is also true the casing system for the Dark Star motors was an engineering masterpiece and clearly unique and innovative. The material selection(s) are superior to the Aerotech SU molded cases in several respects, probably because of Scott's materials expertise and a higher budget for molding than AT has. The motor "system" as a whole was unique. special, reliable, and for a time widely available. A short time. If Matt can't share how many were shipped, perhaps he can share how many months they shipped. I would also be curious about the operating pressure of the motor. The U.S. Rockets F40 and F80 (same geometry and casing system different propellants) was available from about 1987-1993 so I suspect about as many were sold in total but without the Estes figures being disclosed even this many years later, it is hard to compare accurately. They operated at about 400 psi. Last edited by Jerry Irvine : 02-26-2017 at 11:25 AM. |
#44
|
||||
|
||||
Grain geometry is not a copy, at least not of your products. You both used the proper proportion of length/diameter/core for your Bates grain with the motor diameter being the driving factor of the other measurements. If the geometry is off, you get spikes where you don't want them, burn throughs, etc. Those numbers have been around longer than either you or Dixon have been making motors.
__________________
I love sanding. |
#45
|
||||
|
||||
Quote:
If this subject interests you I have posted considerable tech data here: http://v-serv.com/usr/custom/rr38mmCUSTOM.htm Tech Jerry |
#46
|
||||
|
||||
Quote:
I pretty much just said that.
__________________
I love sanding. |
#47
|
|||
|
|||
Quote:
I didn't take it as an attack, Jerry. it indeed was a historical fact. While others had some issues with Jerry over the years, he and I have had a cordial, respectful relationship. We had a lot of fun parked next to each other at one of the Colorado LDRS launches when I was working for Estes. We ran the motors at a target pressure of 400 psi at 70 degrees F. That gave a good balance of delivered Isp with lots of safety margin on the case design. Matt |
#48
|
||||
|
||||
I generally do not direct my posts at an individual even if I quote a particular post. I tend to post to the group as a whole. I have no dispute with anyone here. But the folks with whom I do have a dispute tend to avoid where I dwell because I bring up historical fact that is uncomfortable for them. Pretty sure that is why I was banned from TRF! It certainly is why my posts were deleted when someone bought RocketryOnline.com. Even I can't imagine how labor intensive that was!
Last edited by Jerry Irvine : 03-01-2017 at 07:24 AM. |
#49
|
|||
|
|||
Pictures!
For those who never had the chance to fly or see Dark Star F62 motors flown, here are some pictures of NCRBE kits flown with F62 motors.
__________________
Bob S.A.M. # 0014 |
#50
|
||||
|
||||
Quote:
One can very much see the Scott Dixon influence a la the Vulcan 'Smokey Sam' black smoke density. Loved those Vulcan motors. Scott did great work on his motors. Don't think I ever had a failure with Vulcan motors and back in the day I flew quite a number of them. Nice launch photos! Earl
__________________
Earl L. Cagle, Jr. NAR# 29523 TRA# 962 SAM# 73 Owner/Producer Point 39 Productions Rocket-Brained Since 1970 |
Thread Tools | Search this Thread |
Display Modes | |
|
|