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  #31  
Old 10-21-2019, 11:27 AM
aeppel_cpm aeppel_cpm is offline
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Quote:
Originally Posted by Ez2cDave
Best I can do on the TERRIER booster . . . NOTE the DIFFERENT fins on the Booster.

Dave F.


Interesting that they flew the 17" payload Sandhawk with one of the Nike fin sets on the Terrier. And the overall design really does look like an upscaled Nike Tomahawk.

So I wonder if your drawing above is for the 'BT3' Terrier fins. At least I think that's what the Sandhawk figure reads.
(Edit: It looks like it is, based on converting to metric and adding things up. At least to the nearest centimeter. I looked for RIM-2C fin drawings, too, but didn't find any. But it looks like the RIM-2D to 2F fins would be at least 6cm more span.)


It looks like the Nike-Sandhawk and Terrier Sandhawk would make nice 1/6.5 scale PSII type rockets. Sandhawk with the 2" tube. Nike with 2.5". Terrier with BT80.
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Last edited by aeppel_cpm : 10-21-2019 at 11:55 AM.
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  #32  
Old 10-21-2019, 03:31 PM
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A few more things . . .

Dave F.
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  #33  
Old 10-21-2019, 03:51 PM
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Last edited by Ez2cDave : 10-21-2019 at 04:50 PM.
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  #34  
Old 10-21-2019, 05:36 PM
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Quote:
Originally Posted by aeppel_cpm
Interesting that they flew the 17" payload Sandhawk with one of the Nike fin sets on the Terrier. And the overall design really does look like an upscaled Nike Tomahawk.

So I wonder if your drawing above is for the 'BT3' Terrier fins. At least I think that's what the Sandhawk figure reads.
(Edit: It looks like it is, based on converting to metric and adding things up. At least to the nearest centimeter. I looked for RIM-2C fin drawings, too, but didn't find any. But it looks like the RIM-2D to 2F fins would be at least 6cm more span.)


It looks like the Nike-Sandhawk and Terrier Sandhawk would make nice 1/6.5 scale PSII type rockets. Sandhawk with the 2" tube. Nike with 2.5". Terrier with BT80.


Terrier BT3 fins ar NOT Nike fins . . . The planform is different.

The "drawing" shows Sandhawk 13 fins . . . Sandhawk 17 fins are different at the aft end of the Booster and larger.

Dave F.
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  #35  
Old 10-21-2019, 06:46 PM
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I understand the Terrier and Nike fins arenít the same. To my eye, it looks like the Terrier Sandhawk-17 in Fig 1 is specifying Nike M12 fins on the -Terrier- booster. Likely for a little more stability with those fat payload fins on the sustainer.

And I think the BT-3 fins -are- the first ones you posted. While you havenít posted a RIM-2C (aka BT-3) you can see that the D seems to have extensions to the span. And the F and HTR seem to have the D planiform with a double wedge profile, rather than the diamond pictured in the D and the drawings/photos higher up the thread.

Iím thinking that as they increased the Cp contributing area in the Navy sustainer, they increased the span on the Terrier. Iím guessing the Sandhawk-17 predates that and they just borrowed appropriate Nike fins. The planiforms of the Sandhawk fins sure look borrowed from the Tomahawk- though Iím guessing they are upscaled 13/9 and 17/12. (But I havenít done the math)
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  #36  
Old 10-21-2019, 07:14 PM
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Quote:
Originally Posted by aeppel_cpm
I understand the Terrier and Nike fins arenít the same. To my eye, it looks like the Terrier Sandhawk-17 in Fig 1 is specifying Nike M12 fins on the -Terrier- booster. Likely for a little more stability with those fat payload fins on the sustainer.

And I think the BT-3 fins -are- the first ones you posted. While you havenít posted a RIM-2C (aka BT-3) you can see that the D seems to have extensions to the span. And the F and HTR seem to have the D planiform with a double wedge profile, rather than the diamond pictured in the D and the drawings/photos higher up the thread.

Iím thinking that as they increased the Cp contributing area in the Navy sustainer, they increased the span on the Terrier. Iím guessing the Sandhawk-17 predates that and they just borrowed appropriate Nike fins. The planiforms of the Sandhawk fins sure look borrowed from the Tomahawk- though Iím guessing they are upscaled 13/9 and 17/12. (But I havenít done the math)


I am puzzled by the "M12" designation . . . Nike Boosters are designated "M5" ( M5E1, for example ). I have never seen the "M12" reference before.

Dave F.
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  #37  
Old Yesterday, 05:59 AM
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Nike Ajax fins
https://books.google.com/books/abou...=9 DfWAAAAMAAJ

It looks like the motor was M5 and the fins M12

Edit - sorry that link doesn't land where I thought it would.

https://books.google.com/books?id=9...epage&q&f=false
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  #38  
Old Yesterday, 07:45 PM
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Comrades:

Thanks again for the scale data.

The attachment has fin patterns, shrouds and fin mounts for a nominal 1/10 scale Ute or Paiute. The Sport Scale fin is slightly over-sized in chord and span. The pattern is from the Ute-Tomahawk brochure. It's what I used for my Ute prototype and it has flown several times without so much as a chipped fin. The scale fin is from the cool scale data posted in this thread. It too has a slight scale deviation at the bottom cutaway. It seems that the boat-tail on the real thing was not a true cone but tapered more near the bottom. Also, the fin mounts themselves were on individual areas of the boat-tail that could best be described as bulged. That's way more trouble than I'm going to go to for 1/10 scale so I adjusted the lower root edge of the fin pattern to allow it to fit a straight tapered boat-tail.

There's a scale to make sure you printed correctly and the little line on the fins is the point where tube/boat-tail joint goes.
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