Anyone find detailed photos of the Nike-Smoke or HoJo fins?

[JohnCoker]

I was considering 3D printing the fin can for one of both of these two popular rockets, in which case it's not much extra effort to add extra scale detail. IIRC, both had fins made of bent sheet metal, so there should places where the metal was overlapped and welded and/or screwed.

I haven't been able to find pictures with enough detail to see what the fin can really looked like and the drawings all only show the overall dimensions. I did find some more detailed drawings of the HoJo nose cone with its 4 stabilizing thrusters, but nothing on the fin cans.

Anyone have photos or drawings of the fin can and/or noses with a higher level of detail than published in RotW or typical NAR bulletins?

 

[John Brohm]

This might have what you're looking for:

http://meatballrocketry.com/javelin-gsfc/
John

 

[Ez2cDave]

This might have what you're looking for:

http://meatballrocketry.com/javelin-gsfc/
John

John Coker,

This data, by Joshua Tschirhart, shows the details of the HONEST JOHN booster, in excellent detail.

Also, data, by Jon Randolph, helps with the NIKE Fin Can.

Finally, ARGO D-4 Javelin, supplied by John Langford provides additional data.

Dave

 

[Larry W]

John try this ill find more. I took very detailed pics for a build and can't locate them but I'll find links that might help until I do.
https://www.geocities.ws/eaweder/rocketry/Shilo/shilo.html

 

[Ez2cDave]

John try this ill find more. I took very detailed pics for a build and can't locate them but I'll find links that might help until I do.
https://www.geocities.ws/eaweder/rocketry/Shilo/shilo.html

Larry,

Nice pics, sir !

BTW - The "Small Fin Variant" of the HONEST JOHN is the "M50" . . . The original HONEST JOHN ( large fins ) is the "M31".

Here are some more images, for John Coker.

Dave F.

 

[OverTheTop]

Here is a Nike-Black Brant at NASA Godard SFC.

 

[OverTheTop]

Same location, Nike Tomahawk I think

 

[OverTheTop]

Here is a Nike Apache at the Udvar Hazy center

 

[JohnCoker]

Thanks for all the great pictures and links!

Interesting, sometimes the Nike fins were bolted and sometimes welded. I like that huge flange with the multiple bolt holes, that should show up nicely when 3D printed.

It's always amazing how sloppy these things look in real life. Even when not made by slave labor, they all look like they were "built on Friday."

 

[Johnly]

I'd love to have the print files for a Nike fincan for use on a Estes BT-60 sized airframes.

 

[Larry W]

Found this

 

[ZEDL1]

John, if you print them and offer them for sale to we members, please let me know.
Thank you.
Jim

 

[Ez2cDave]

Thanks for all the great pictures and links!

Interesting, sometimes the Nike fins were bolted and sometimes welded. I like that huge flange with the multiple bolt holes, that should show up nicely when 3D printed.

It's always amazing how sloppy these things look in real life. Even when not made by slave labor, they all look like they were "built on Friday."

John,

There are several DIFFERENT Sizes and Types of NIKE Fins . . . ALSO, there are several DIFFERENT Fin Can designs.

Dave F.

 

[JohnCoker]

John,

There are several DIFFERENT Sizes and Types of NIKE Fins . . . ALSO, there are several DIFFERENT Fin Can designs.

Dave F

Yep, so we can pick details we like.

Those last two photos really give a nice view of the way (one style of) the fin can worked. It would be cool to print the fins separately and pin them together like in that prototype.

 

[Bruiser]

I've always thought the Smoke used the same type of fin attachment as the Nike Apache in post 8 because it matches the Harry Stine drawing

-Bob

 

[Ez2cDave]

I've always thought the Smoke used the same type of fin attachment as the Nike Apache in post 8 because it matches the Harry Stine drawing

-Bob

Nike Smoke . . . Nike Apache, at bottom.

Dave F.

 

[Ez2cDave]

Yep, so we can pick details we like.

Those last two photos really give a nice view of the way (one style of) the fin can worked. It would be cool to print the fins separately and pin them together like in that prototype.

John,

I incorrectly identified the previous rocket as a Nike-Apache ( sorry ) . . . The unusual Fin attachment is the EARLY Nike-Cajun, as done by the University of Michigan . . .

Some more data for you . . .

Dave F.

 

[Curtis Enlow]

I was wondering reading through the thread how much a scale airfoil shape affects the CP versus a simple flat fin on model rockets?

I love the look of nicely modeled and finished airfoil fins, but I wonder if any work has been done to show their efficacy on model rockets?

 

[Ez2cDave]

I was wondering reading through the thread how much a scale airfoil shape affects the CP versus a simple flat fin on model rockets?

I love the look of nicely modeled and finished airfoil fins, but I wonder if any work has been done to show their efficacy on model rockets?

The PDF file below may be helpful . . .

 

[OverTheTop]

Any aerodynamacists out there?

I think the airfoiling improves the lift of the fins. In rockets this manifests itself as the amount of force created, when not at zero angle of attack, to straighten the flight. There is a number called the Reynolds Number which is quite large in faster craft and small in slower. I think there will be an effect in our model rockets but most of the time it will be swamped by other factors. I can't remember the theory exactly, but I think I am right with this. Happy to be told otherwise by a more capable person.

 

[Curtis Enlow]

I think the airfoiling improves the lift if the fins. In rockets this manifests itself as the amount of force created, when not at zero angle of attack, to straighten the flight.

I agree. different scale airfoils certainly make a difference on R/C aircraft, as well as helicopters and, I would assume, R/C jets, as well. Ive read some opinions on forums that the Reynolds Number issue suggests that scale airfoils cant make that much difference, but practical experience says otherwords.

Im eager to dive into the article Dave offered above to see what it says on the matter.

Speed, of course, is a big factor, scale or othwrwise.

 

[Ez2cDave]