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Royatl 07-07-2015 09:44 AM

Quote:
Originally Posted by dannymrmissile
Everything here is BT 40. The steel ruler is all I had & may mess up the pics. Let me know what else you need, Bt 30s too? Danny BTW-this is a 16 inch ruler.


Danny,
One thing I noticed about original BT-30 (and the BT-40 repros that Quest used in their 50th Anniversary MMI Aerobee-Hi) weren't always precisely round. Is that true of the original BT-40 you have?

stefanj 07-07-2015 01:23 PM

When I was REALLY just starting out, eartly 1971 maybe, and eight years old, I found one of those silver spin fin units. The "can" had split, melted open. I followed the directions in the Design Book to roll a tube (horrible, lumpy) and somehow got some soft wood to make a lumpy carved cone.

stefanj 07-07-2015 01:25 PM

Maybe if enough people ask Firefox they'll stock some of their BT-40 equivalent tube *uncut* and we can make some Dirty Birds!

dannymrmissile 07-08-2015 12:06 AM

Bt-40
 
Quote:
Originally Posted by Royatl
You could see if e-Rockets has some Semroc BT-40 equiv. left (or if they're having more made for Aerobee-Hi kits). I bought a few from Sheryl a few months before she sold.


NO Need---I stocked up on those before semroc was sold. ...........

dannymrmissile 07-08-2015 12:11 AM

Bt-40
 
Quote:
Originally Posted by Royatl
Danny,
One thing I noticed about original BT-30 (and the BT-40 repros that Quest used in their 50th Anniversary MMI Aerobee-Hi) weren't always precisely round. Is that true of the original BT-40 you have?


Actually, YES. These tubes are the Primitive tubes they started out to be. There is a slight 'oval' in the tube, but hardly noticeable--especially if they are used to build a kit. If Quest did this in the Repro Aerobee Hi kit, I applaud them for the accuracy in reproducing a 'true' as possible replica ! These old tubes are 1 of a kind & a joy to have. Thanks, Danny.

dannymrmissile 07-08-2015 12:14 AM

Agreed
 
Quote:
Originally Posted by stefanj
When I was REALLY just starting out, eartly 1971 maybe, and eight years old, I found one of those silver spin fin units. The "can" had split, melted open. I followed the directions in the Design Book to roll a tube (horrible, lumpy) and somehow got some soft wood to make a lumpy carved cone.


Ha, Yes--Live & Learn. But those were the 1st, and from 1960--when most rockets were made from fire works parts ! I don't think they were designed to last long--just an early idea by G Harry & the rest....... Any Plastic fin unit exposed even 'Near' the exhaust, will melt some. Danny.

dannymrmissile 07-08-2015 12:20 AM

Oval Tubes
 
2 Attachment(s)
Quote:
Originally Posted by Royatl
Danny,
One thing I noticed about original BT-30 (and the BT-40 repros that Quest used in their 50th Anniversary MMI Aerobee-Hi) weren't always precisely round. Is that true of the original BT-40 you have?


While not too pronounced, here's a pic of some BT 30 & 40s. Hope Pics. are clear,, but they are out of round, some. BTW--these are actually the earlier BT 1 & 2 Tubes. Danny.

Royatl 07-08-2015 08:13 AM

Quote:
Originally Posted by dannymrmissile
Actually, YES. These tubes are the Primitive tubes they started out to be. There is a slight 'oval' in the tube, but hardly noticeable--especially if they are used to build a kit. If Quest did this in the Repro Aerobee Hi kit, I applaud them for the accuracy in reproducing a 'true' as possible replica ! These old tubes are 1 of a kind & a joy to have. Thanks, Danny.


Yes, everything was reproduced fairly exact except the nose cone (made of balsa instead of maple or vinyl) and the box (though they tried to make it look sorta like the old box. Inks today are too bright!)

Joe Shockcord 07-11-2015 09:09 AM

1 Attachment(s)
Yesterday I scored some vintage rockets and engines on Craig's List and in the box was the mentioned fin can and a small piece of BT-30 or 40. I found the right size cone from the bag the fireworks vendor gave me and viola: a Sky Bird...or, reasonable facsimile thereof.

JohnNGA 07-11-2015 10:50 AM

That is really cool!!....from the Jurassic world of model rocketry.


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