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  #51  
Old 04-14-2009, 10:36 PM
MDorffler MDorffler is offline
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Quote:
Originally Posted by tbzep
What was the competition with Centuri like for you guys doing all the designing? Were there many designs (not just rockets) that were meant to directly compete with a specific product they produced, or vice versa? I know the products eventually intermingled, so I'm referring to the days before that happened. Mr. Estes said he always had a friendly respect and competition with Mr. Piester as a company, but I never saw anything specific printed about it.


To add to this, there was never anything but cordial relations between Estes and Centuri. Vern and Lee got along well, but always like to play one up on each other when ever possible. But they are both great guys and believed they keyed off each other. There was never any reason for them to be at odds. It would have been counter productive.

On the lighter side, Wayne got out his electric eraser and had a ball with one of Lee's Enerjet ads. It was an ad where Lee is sitting at a desk holding an Enerjet motor in his hands. Wayne erased out Lee's hands and face and drew in bandages, then changed the name to 'EnerBlast' at the top. There was also a small cameo on the wll as I remember of a model in flight. He drew in a star burst on top of the model implying it was blowing up, obviously by an
'EnerBlast' motor. Wayne showed it to Vern, who sent a copy to Lee - which didn't go over well as I remember.
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  #52  
Old 04-14-2009, 10:38 PM
MDorffler MDorffler is offline
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Quote:
Originally Posted by dwmzmm
Are you a member of the NAR?


I haven't been for many years. I have not been to an NAR function since I flew the Cineroc proto at NARAM at the Air Force Acadamy in 1969.
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  #53  
Old 04-14-2009, 11:57 PM
snaquin snaquin is offline
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Mike,

Can you tell us more about the two stage carrier for the Cineroc used for the first flight in 1968? What Mini-Max engines did you select for this flight?

I noticed the fins were very similar in design to the first stage fins of the Astron Delta and that this carrier appears to have used three fins instead of four like the Omega.

Also the NARAM-11 carrier vehicle appears to be another original design. What can you tell us about your experimentation with different engines and design considerations that went into the various carrier vehicles you designed.

The Omega was always one of my favorite rockets. It would be interesting to know how you came about reaching that final production design.

Oh, and welcome to the forum!

Thanks!



.
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  #54  
Old 04-15-2009, 12:36 AM
scigs30 scigs30 is offline
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Mike, I just opened up a vintage Blue Bird Zero Kit and building it in the projects section. This is cool design.
http://www.oldrocketforum.com/showt...67492#post67492
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  #55  
Old 04-15-2009, 02:49 AM
Initiator001 Initiator001 is offline
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Mike,

To repeat what others have said, welcome to YORF and thank you for taking the time to reply to our questions.

My question concerns 'Products which were announced but never released'.

I am curious about the stories behind two rocket kits which were announced in Estes catalogs but never made it to the hobby shop.

I would like to know the story/history of the Battlestar Galctica Cylon Raider kit (# 1313) featured in the 1979 catalog (You may remember that catalog, I think there was some rocket camera on the cover... ).

The other kit was announced in the 1980 catalog, the Black Hole Cygnus Probe Ship (#1351).

I have been curious about what happened to these two models for nearly thirty years. Were any prototypes made? How close did they get to production? What stopped their release?

I look forward to your reply and thank you for your time.

Bob Sanford
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  #56  
Old 04-15-2009, 03:03 AM
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Leo Leo is offline
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Wow, this is just fantastic. Waking up in the morning and reading this thread is just fantastisch!

@Scott: You better have full control over your Server with tripple back-ups and all, don't want anything to have happen like on the "other forum" or else I will personally fly over from Germany and gag you

Mike,

I'll start with my questions by moving away from black powder rockets and direct you to the "Cold Power" line.

- What was your involvement in the Cold Power line?
Wayne Kellner told me via Bill Simon that you designed the Shark CP, correct?

- The Cold Power line only lived for a short time. Was it a successful series for Estes?
If not what were the problems keeping the CP series afloat?
I would guess manufacturing the CP engines wasn't an easy task cost wise. Or did FREON kill the product line?

- What was more popular, the flying rocket line or the Land Rocket line?

- Did you fly any CP rockets and if so with success?

- How was Vern Estes involved in the CP Line or his attitude toward them, him coming from the BP side e.g.

- Any special tidbits about the history of the CP Line within Estes that you could share?
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  #57  
Old 04-15-2009, 06:49 AM
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Rocketflyer Rocketflyer is offline
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Quote:
Originally Posted by MDorffler

To get to your essential question - yes, black powder made today is 'slower' than it was ten years ago, and it's getting slower. That changes the burn rate of our motors just as it does everyone else's motors. We do burn rate tests on every single lot of powder we buy to characterize it. We press and burn a lot of motors in this process. We have to know how many clicks to adjust engine manufacturing equipment in order to maintain the NAR impulse standards we have always adhered to.

Does this help?



Thank You Mike. I just learned a great amount of info from your post.
BTW that Wayne Kellner skit with the DC-3 was beyond priceless.

So, I have another question about motors. As the burn time increases, does this mean more propellant charge in the casing? Could this mean a longer casing than the "standard" 70mm?
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Last edited by Ltvscout : 04-15-2009 at 07:59 AM.
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  #58  
Old 04-15-2009, 07:54 AM
foose4string foose4string is offline
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Quote:
Originally Posted by MDorffler
This is a great question. This sould make for interesting excahnges with the engine guys here.

Many of you may not realize that there has never been two like batches of black powder ever made. That includes the one that may have been made yesterday, and the batch made today on the same equipment, and from materials from the same bags or sacks.

Terry - feel welcome to jump in on this if you think I miss something----

While potassium nitrate stays relatively constant, both the sulfer and charcoal change ever so slightly from lot to lot. The charcoal is the ingredient that has the greatest overall control over the burn rate of a particular batch. Hickory has historically been the preferred source of charcoal, but woods such as pine can in a pinch be uased as well.

Trees as a species morph over time, which side of the hill they were grown on and where they were harvested changes, the ingrediants in the soil changes, and so does the temperature while they were growing. The variables are staggering that affect the tree before the wood is harvested. And do you use the branches or the truck, or both? Then there is the process of heating the wood to produce the charcoal. Getting to repeatable charcoal for black powder is a serious issue.

To get to your essential question - yes, black powder made today is 'slower' than it was ten years ago, and it's getting slower. That changes the burn rate of our motors just as it does everyone else's motors. We do burn rate tests on every single lot of powder we buy to characterize it. We press and burn a lot of motors in this process. We have to know how many clicks to adjust engine manufacturing equipment in order to maintain the NAR impulse standards we have always adhered to.

Does this help?


This probably explains why I've had C6 motors with identical delay times, manufactured within a year or two of each other, and didn't "look" the same. The caps were in very different locations in relation to the top of the casing. One was near the very end and one was recessed by about 1/4 inch. I flew them back to back and could see no major difference in performance. That's just good QC. Sure, we get reports if a bad motor every now and then -nozzle blow through , overzealous ejection charge, weak ejection charge, etc. but those are rare occurances indeed.

Last edited by foose4string : 04-15-2009 at 09:42 AM.
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  #59  
Old 04-15-2009, 08:10 AM
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tbzep tbzep is offline
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Did the ladies that filled our mail orders really keep up with what we owed?

It seems like every time I ordered there was a price increase or I miss added and I owed them a nickel, or a quarter. I always added that to my next order, but I bet Estes ate a considerable amount of profit by being kind to us kids and shipping our orders anyway.

BTW, I don't know if it was the Colorado air or what, but I absolutely loved and will forever remember the smell that wafted out of the boxes shipped from Penrose. To me, that is the true scent of rocketry instead of spent BP motors.
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  #60  
Old 04-15-2009, 08:39 AM
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ghrocketman ghrocketman is offline
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+1 to wanting to know what the deal was with the Batllestar Galactica Cylon Raider and the Black Hole Cygnus Probe Ship.
Were prototypes ever built and do any photos exist for either ?
What was the reasoning for those making the catalogs but never being sold ?
I have never been able to get ANY sort of satisfactory information about either of these.

Also, how about the Centuri "Magnum-D" Tomahawk ?
Any information as to why this one made the 1981 catalog but was never produced ?
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Last edited by ghrocketman : 04-15-2009 at 12:30 PM.
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