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-   -   Estes Jupiter C (http://www.oldrocketforum.com/showthread.php?t=525)

Patriot Pilot 10-31-2005 07:20 PM

1 Attachment(s)
Heres what I got based on a BT-70.
Rechecked it to make sure so if I am wrong its only human. :D
The missing measurement is .666". You figure it out. ;)

CPMcGraw 10-31-2005 11:17 PM

Quote:
Originally Posted by Patriot Pilot
Heres what I got based on a BT-70.
Rechecked it to make sure so if I am wrong its only human. :D
The missing measurement is .666". You figure it out. ;)


So, it's a real beast? :D

Curious measurement...


Here's what I measure for the most-recent release of the Mercury-Redstone (plastic fins)...

Root Edge -- 3.6"; the lower part of the under-skirt fin drops down 0.1" below the trailing edge of the outer fin. Matches well otherwise with PatriotPilot's drawing.

Outer Fin Tip Edge -- 1". Matches the drawing.

Outer Fin Span -- 0.75", or 50% wider than the drawing.

Inner Fin Span -- 0.90", or 80% wider than the drawing.

Under-skirt Span -- 0.40", which is 0.025" wider than the drawing.

Under-skirt Chord -- 0.90", or about 40% longer than the drawing.

With the exception of the increases in overall span, these fins look good enough for an SOS model, and they already have the leading edge bevel molded in. They have that prototype thickness, too. Maybe these fins would be a better starting point, if one could build the motor mount with more traditional non-plastic parts.

A Fish Named Wallyum 10-31-2005 11:29 PM

I've got the original fins here at work tonight, so I'll decide what I'm going to do after I see how they look glued together. (Monday is a notoriously slow night.)

Tau Zero 10-31-2005 11:49 PM

0.666"?
 
Quote:
Originally Posted by CPMcGraw
0.666" -- So, it's a real beast? :D
Or a fraction (I mean, "decimal") thereof. :eek: :D ;) :cool:

--Jay


"Run for the hills/Run for your lives..."
--Iron Maiden

tbzep 11-01-2005 05:26 PM

1 Attachment(s)
Quote:
Originally Posted by Patriot Pilot
Heres what I got based on a BT-70.
Rechecked it to make sure so if I am wrong its only human. :D
The missing measurement is .666". You figure it out. ;)


There's a problem with the drawing. The control surface wedge is shown going all the way up to the angled main fin component. The wedge is much shorter for the Redstone booster. Your drawing of the wedge looks more like what they've done with the Jupiter-C.

My numbers are slightly different also. Click on image for numbers and a note on how the wedge is shorter than the main fin tip.

Patriot Pilot 11-01-2005 06:19 PM

Okay so I rounded the outside fin up to 1 inch instead of leaving it at .95 something and I didn't carry my mutiplier out past 3 digits . Fire me. :D :D :D

tbzep 11-01-2005 06:34 PM

Quote:
Originally Posted by Patriot Pilot
Okay so I rounded the outside fin up to 1 inch instead of leaving it at .95 something and I didn't carry my mutiplier out past 3 digits . Fire me. :D :D :D


That wasn't my point, and I wasn't being nitpicky about the numbers. I just decided to include them when I ran the numbers for the control wedge and the fin tip. My point is that the wedge went all the way up to the leading edge of the fin in your drawing, but it doesn't come near it on the real thing.

My sole reason for posting to this thread the first time was to give Bill a head's up on the different look between the two Estes Redstone based kits so that he could modify one of them to look like the other for a nicer looking pair. I didn't intend it to be a scale expose. Some of you guys started throwing in scale numbers. :D

A Fish Named Wallyum 11-01-2005 06:47 PM

I have some pics of my own from the Smithsonian last year, but the Jupiter on display there isn't in a good position for detail photography, especially on a Saturday afternoon. :rolleyes: I appreciate all the data, but as long as it flies, I'll be happy. :cool:

Patriot Pilot 11-01-2005 07:10 PM

I just wanted to overwhelm Bill with numbers. I don't think he even knows what a scale is.
He's the english major here its like a second language to him. :D :D

tbzep 11-01-2005 07:34 PM

Quote:
Originally Posted by Patriot Pilot
I just wanted to overwhelm Bill with numbers. I don't think he even knows what a scale is.
He's the english major here its like a second language to him. :D :D


LOL!

Bill, here is your multiple choice question.

Scale is

a. an inanimate object that ridicules me about my love handles..
b. what I do to get to the top of the "to build" pile.
c. a proportion used in dimensional relationship.
d. little nasty thingies all over those icky fish.


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