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  #21  
Old 01-17-2013, 08:18 PM
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Quote:
Originally Posted by Jerry Irvine
http://v-serv.com/usr/pubs/air4.htm

Not all shrouds are steep enough to even require rings or at least thick rings or support tubes.

This ramjet design suits itself to "Integrated Tube" methodology.

Jerry


One fin is completely on the shroud. The other two are almost completely on it. The shroud will need to be more stiff than the usual rocket tail cone where the majority of the fins are on the BT. If it gets designed with TTW, rings will help maintain the shroud's shape once slots are cut. Shrouds tend to bow when they are cut. This ain't my first rodeo.
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  #22  
Old 01-17-2013, 09:12 PM
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Grab that bull by the neck and choke that MF. An integrated tube shroud which is as strong as a tube itself, can be any arbitrary taper or curved taper and the glue is as strong at the tube as well. Just as you can have a centering ring 2" inside a tube and still have a motor flush with the rear of the tube, you can also glue a fin to any arbitrary shaped "integrated tube" shroud and have it be exactly as strong as a cylindrical tube.

BTW what the heck is a rodeo?
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  #23  
Old 01-17-2013, 09:29 PM
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I understand the tube shroud method. However, very few people are going to go that route over a paper shroud on an LPR rocket. If Gordy were to design it as a mid or HPR rocket, he'd probably just turn some balsa. (Edit: which for me would me a lot more sanding. I'd rather use the fugue tube method and just fill a few spirals!)

While we are discussing things cordially, where is Korey Kline these days?
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  #24  
Old 01-17-2013, 10:00 PM
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Quote:
Originally Posted by tbzep
I'd rather use the fugue tube method and just fill a few spirals!
So do it and stop gain-saying it.
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  #25  
Old 01-17-2013, 10:20 PM
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Quote:
Originally Posted by Jerry Irvine
So do it and stop gain-saying it.

To be honest, I didn't look at the link until after I posted the rodeo reply. I stopped doing HPR and EX not long after the BATFE started coming down hard. I had grown bored with it anyway, especially having to travel hundreds of miles and stay in hotels for a field with a decent waiver. Since paper or balsa cones have done the job in my LPR endeavours, I haven't used body tube material for a shroud in well over a decade. I'd pretty much forgot about it. The old "use it or lose it" applies.
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  #26  
Old 01-17-2013, 11:22 PM
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  #27  
Old 01-18-2013, 01:28 AM
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Quote:
Originally Posted by tbzep
I stopped doing HPR and EX not long after the BATFE started coming down hard. I had grown bored with it anyway, especially having to travel hundreds of miles and stay in hotels for a field with a decent waiver.
That's rational.
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  #28  
Old 10-16-2021, 08:37 PM
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This is the only dimensioned drawing of the NA-704 that I know of.
It was on an eBay auction years ago from someone in China.

Can't do much with a low resolution image but sport scale proportions could be managed by squinting the eyeballs and tracing the outline.

These are the only photos I have but I have seen one other photo years ago but have been unable to track it down.
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