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  #1  
Old 04-19-2007, 10:58 PM
Tau Zero's Avatar
Tau Zero Tau Zero is offline
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Location: Twin Falls, Idaho, USA
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Question Centuri/Semroc nose cones

The first picture below was gonna be really cool, but apparently I have a case of Intermittent Middle Age Shakes. (Never mind that the camera's shutter speed is way too slow, and that it came free with my now-retired Dell printer. )

EDIT: I took a much clearer picture (#2) outside today.


+++

I kept thinking that Centuri's PNC-74 was "pointier" than Carl's BC-734P. (For the record, I *love* that shape! ) So I dragged out my limited collection of Centuri cones and some Semroc counterparts.


Below (left to right), the Centuri nose cones are PNC-73, -74, and -76.
The Semroc cones are BC-723P [PNC-73], BC-735 [closer to PNC-74 than BC-734P], the aforementioned BC-734P [PNC-76?], and BC-730.

Now if my picture had turned out as clearly as I *hoped* , it would be obvious that:


1) The two cones on the far left [Centuri PNC-73] are basically identical in shape.

2) If you round off the very point of the Semroc BC-735, it's a dead ringer for Centuri PNC-74. (Oops! I even managed to "bash" off the point of the balsa cone while handling it.)


EDIT: The next paragraph was re-edited for picture #2 below.

3) The tip of the [next to the] last cone on the right (Semroc BC-730) isn't quite as round as the BC-734P (which *may* be mislabeled). However, the BC-734 is nearly indistiguishable from the Centuri PNC-76... which is [second from the] right at 3" long.


The point of all this rambling is, I *think* more accurate Semroc substitutes for these Centuri parts would be:

Centuri -- Semroc

PNC-73 -- BC-723P

PNC-74 -- BC-735

PNC-76 -- BC-734P


The problem with being analytical at work all day is that it spills over into my hobbies when I'm *off* work. (heavy sigh) This all got started when I read the Centuri "Sky Devil" posts, and promptly went downhill from there.


Carl, is your BC-734P (WHICH I LOVE!) supposed to be 3.4" long [Centuri PNC-74?], instead of ~3.0"? I'm not trying to nitpick, (mock sobbing) I JUST HAVE TO *KNOW!*


Or not.


Cheers, as always,
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Jay Goemmer
"Centuri Guy"/"Tau Zero"
YORF Member 28
Semroc SAM #0029
NAR 86131


"I think about organizing things all the time. Never seems to happen. I find something that piques my interest and I'm off on a quest. Or a Centuri. "

--Bill Eichelberger, 02/22/2022


“Centuri fret buzz in an updated form.”
Bill “Wallyum” Eichelberger re: Estes Flutter-By
03 Sept 2014

Last edited by CenturiGuy : 04-28-2007 at 05:45 PM. Reason: Clearer Picture (see #2)
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  #2  
Old 04-19-2007, 11:06 PM
A Fish Named Wallyum A Fish Named Wallyum is offline
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You just need better light. Try taking the pictures outside on a sunny day.
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Bill Eichelberger
NAR 79563

http://wallyum.blogspot.com/

I miss being SAM 0058

Build floor: Centuri Design Contest F-150 Hurricane Estes - Low Boom SST Semroc - Gee'Hod, Shrike, SST Shuttle

In paint: Canaroc Starfighter Scorpion Estes F-22 Air Superiority Fighter, Solar Sailer II Semroc Cyber III

Ready to fly: Estes - Multi-Roc, Solar Sailer II Semroc - Earmark, Snake Jumper
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  #3  
Old 04-19-2007, 11:27 PM
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Tau Zero Tau Zero is offline
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Red face Looking for an honest... light source?

Quote:
Originally Posted by A Fish Named Wallyum
You just need better light. Try taking the pictures outside on a sunny day.
I used a "trouble light," which improved things slightly, but I may try again outside this weekend.

If it doesn't snow like it did today.


Cheers,
__________________
Jay Goemmer
"Centuri Guy"/"Tau Zero"
YORF Member 28
Semroc SAM #0029
NAR 86131


"I think about organizing things all the time. Never seems to happen. I find something that piques my interest and I'm off on a quest. Or a Centuri. "

--Bill Eichelberger, 02/22/2022


“Centuri fret buzz in an updated form.”
Bill “Wallyum” Eichelberger re: Estes Flutter-By
03 Sept 2014
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  #4  
Old 04-29-2007, 11:07 PM
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Tau Zero Tau Zero is offline
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Red face Making Old Threads New

Quote:
Originally Posted by CenturiGuy
EDIT: I took a much clearer picture (#2) outside today.
Well, okay, that was *yesterday,* but there you go.


Cheers,
__________________
Jay Goemmer
"Centuri Guy"/"Tau Zero"
YORF Member 28
Semroc SAM #0029
NAR 86131


"I think about organizing things all the time. Never seems to happen. I find something that piques my interest and I'm off on a quest. Or a Centuri. "

--Bill Eichelberger, 02/22/2022


“Centuri fret buzz in an updated form.”
Bill “Wallyum” Eichelberger re: Estes Flutter-By
03 Sept 2014
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  #5  
Old 04-30-2007, 10:35 PM
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Carl@Semroc Carl@Semroc is offline
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Thanks Jay! You caught me good this time. Sorry for the long delay, but it has been busy lately and this took more research that usual.

I THINK I know what happened. Looking back through the files, the BC-734P is a true anomaly or in rocket scientist speak, "less than optimal." Centuri produced two PNC-76 nose cones. Both were 3.0" long, but the first was injection molded with a separate shoulder piece and was more pointed. The later PNC-76 was blow-molded as one unit and was about .025" shorter and slightly thicker toward the tip. It is the one that was mass produced and found its way into more kits than the earlier version, like the one you have. I intended to release it as the BC-730P, knowing that most people would not see (and appreciate) the subtle differences.

I had an entry in the spreadsheet for the correct 3.4" long BC-734P that was intended to be a balsa equivalent of the PNC-74 injection molded version. Since it had the same name but was earlier in the file, it kept getting overwritten with the one that should have been BC-730P. So it kept getting left out. I do not have a blow-molded version of the PNC-74 so I am not sure they ever did it. Since several others made the jump from injection to blow-molded, I think it is possible that there are some "in the wild."

I sent you a couple of the REAL, new, improved, "more gooder" BC-734P cones today. Sheryl is getting the stock corrected tomorrow, so we should be right back there where I THOUGHT we were a few weeks ago!

The Centuri Cross-Reference is still good. It just does not have the distinction between the two versions of the PNC-76 replacements.

Thanks again, Jay!
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  #6  
Old 04-30-2007, 11:11 PM
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Tau Zero Tau Zero is offline
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Thumbs up Making (Apparent) Sense of Nonsense

Quote:
Originally Posted by Carl@Semroc
Thanks Jay! You caught me good this time.
(chuckling) I didn't intend to "catch" you, Carl! That was just a side effect of my "analytical exorcism!"


Quote:
I sent you a couple of the REAL, new, improved, "more gooder" BC-734P cones today. Sheryl is getting the stock corrected tomorrow, so we should be right back there where I THOUGHT we were a few weeks ago!

The Centuri Cross-Reference is still good. It just does not have the distinction between the two versions of the PNC-76 replacements.

Thanks again, Jay!
Please feel free to keep the BC-730P available! And thanks (as always) for going "above and beyond" for *all* of us incurable Semroc fans!


Cheers,
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Jay Goemmer
"Centuri Guy"/"Tau Zero"
YORF Member 28
Semroc SAM #0029
NAR 86131


"I think about organizing things all the time. Never seems to happen. I find something that piques my interest and I'm off on a quest. Or a Centuri. "

--Bill Eichelberger, 02/22/2022


“Centuri fret buzz in an updated form.”
Bill “Wallyum” Eichelberger re: Estes Flutter-By
03 Sept 2014
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  #7  
Old 05-01-2007, 09:36 AM
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Tau Zero Tau Zero is offline
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Wink Changing my mind, already...

Quote:
Originally Posted by CenturiGuy
The point of all this rambling is, I *think* more accurate Semroc substitutes for these Centuri parts would be:
At least, after I get done updating them (the links below are "clickable"):

Centuri -- Semroc

PNC-73 -- BC-723P

PNC-74 -- BC-734P

PNC-76 -- BC-730P


Cheers,
__________________
Jay Goemmer
"Centuri Guy"/"Tau Zero"
YORF Member 28
Semroc SAM #0029
NAR 86131


"I think about organizing things all the time. Never seems to happen. I find something that piques my interest and I'm off on a quest. Or a Centuri. "

--Bill Eichelberger, 02/22/2022


“Centuri fret buzz in an updated form.”
Bill “Wallyum” Eichelberger re: Estes Flutter-By
03 Sept 2014
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  #8  
Old 05-02-2007, 10:57 PM
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Tau Zero Tau Zero is offline
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Thumbs up NEW! Semroc BC-734P (Centuri PNC-74)

Quote:
Originally Posted by Carl@Semroc
I sent you a couple of the REAL, new, improved, "more gooder" BC-734P cones today.
Quote:
Originally Posted by CenturiGuy
Check out the contents of the Semroc box that turned up on my desk at work today.

--How cool is *that?!?*


Cheers,
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__________________
Jay Goemmer
"Centuri Guy"/"Tau Zero"
YORF Member 28
Semroc SAM #0029
NAR 86131


"I think about organizing things all the time. Never seems to happen. I find something that piques my interest and I'm off on a quest. Or a Centuri. "

--Bill Eichelberger, 02/22/2022


“Centuri fret buzz in an updated form.”
Bill “Wallyum” Eichelberger re: Estes Flutter-By
03 Sept 2014
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  #9  
Old 05-02-2007, 11:06 PM
A Fish Named Wallyum A Fish Named Wallyum is offline
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Looks like two scratchbuilds to me. One can be the Snake, the other the Arrow.
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Bill Eichelberger
NAR 79563

http://wallyum.blogspot.com/

I miss being SAM 0058

Build floor: Centuri Design Contest F-150 Hurricane Estes - Low Boom SST Semroc - Gee'Hod, Shrike, SST Shuttle

In paint: Canaroc Starfighter Scorpion Estes F-22 Air Superiority Fighter, Solar Sailer II Semroc Cyber III

Ready to fly: Estes - Multi-Roc, Solar Sailer II Semroc - Earmark, Snake Jumper
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  #10  
Old 05-02-2007, 11:40 PM
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Tau Zero Tau Zero is offline
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Wink The Main Monkey Business?

Quote:
Originally Posted by A Fish Named Wallyum
Looks like two scratchbuilds to me. One can be the Snake, the other the Arrow.
ROTFL!

--*Nice.* (I bought the CD today, and I'm listening to it now. "Brought to you by the letter 'ssssss'" )


Actually, I think one of them will be, (whispered) "Stiletto."

http://www.ninfinger.org/~sven/rock...a/72cen014.html


...with Bill (Vanel) Cooke's "reversed" paint job :

http://forums.rocketshoppe.com/show...hlight=Stiletto


Cheers,
__________________
Jay Goemmer
"Centuri Guy"/"Tau Zero"
YORF Member 28
Semroc SAM #0029
NAR 86131


"I think about organizing things all the time. Never seems to happen. I find something that piques my interest and I'm off on a quest. Or a Centuri. "

--Bill Eichelberger, 02/22/2022


“Centuri fret buzz in an updated form.”
Bill “Wallyum” Eichelberger re: Estes Flutter-By
03 Sept 2014
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