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

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__________________
Steve Carr
NAR 82506

So, it's a real beast?

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.

__________________
Craig McGraw

BARCLONE Rocketry -- http://barclone.rocketshoppe.com
BARCLONE Blogsite -- http://barclone.wordpress.com
BARCLONE Forum -- BARCLONE Forum

BARs helping BARs

SAM 0044
AMA 352635

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.)

__________________
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 - Marauder, Shrike, SST Shuttle

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

Ready to fly: Estes - Solar Sailer II Semroc - Earmark, Groonie Der V 1/2

Or a fraction (I mean, "decimal") thereof.

--Jay


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

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.

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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.

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Steve Carr
NAR 82506

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.

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. I appreciate all the data, but as long as it flies, I'll be happy.

__________________
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 - Marauder, Shrike, SST Shuttle

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

Ready to fly: Estes - Solar Sailer II Semroc - Earmark, Groonie Der V 1/2

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.

__________________
Steve Carr
NAR 82506

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.