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  #11  
Old 08-25-2017, 10:24 AM
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tbzep tbzep is offline
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Your Centuri fleet looks great and you picked some of Centuri's best designs!
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  #12  
Old 08-25-2017, 10:55 AM
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Quote:
Originally Posted by tbzep
Your Centuri fleet looks great and you picked some of Centuri's best designs!
Agreed, and they certainly make me wistful...maybe, if a collaboration could be developed between Sirius Rocketry (and/or Boyce Aerospace Hobbies) and Semroc, Retro-Repro Centuri kits such as those (and others, too) could be made, and with polyurethane resin or ABS plastic nose cones?
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  #13  
Old 08-25-2017, 11:40 AM
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Those cones can all be done in balsa. Semroc/eHobbies already has most if not all of them. The worrisome parts are the little detail pieces on a couple of the old kits.
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  #14  
Old 08-25-2017, 11:54 AM
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Quote:
Originally Posted by tbzep
Those cones can all be done in balsa. Semroc/eHobbies already has most if not all of them. The worrisome parts are the little detail pieces on a couple of the old kits.
*Nods* I certainly wouldn't turn my back on such kits just because they had (substitute) balsa nose cones (and transitions, as Semroc's Centuri Excalibur has), but wherever resin or other plastic duplicates of the original injection-molded styrene ones were available (as they are--in many cases--from Sirius Rocketry), I'd prefer to use them instead of balsa.
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http://www.lulu.com/content/paperba...an-form/8075185
http://www.lulu.com/product/cd/what...of-2%29/6122050
http://www.lulu.com/product/cd/what...of-2%29/6126511
All of my book proceeds go to the Northcote Heavy Horse Centre www.northcotehorses.com.
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  #15  
Old 08-25-2017, 12:53 PM
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Quote:
Originally Posted by blackshire
*Nods* I certainly wouldn't turn my back on such kits just because they had (substitute) balsa nose cones (and transitions, as Semroc's Centuri Excalibur has), but wherever resin or other plastic duplicates of the original injection-molded styrene ones were available (as they are--in many cases--from Sirius Rocketry), I'd prefer to use them instead of balsa.

For a display model, yes. But for flying, those things are really heavy. I can finish a balsa nose cone that you can't tell from plastic unless you pull it out of the tube, and even with the sealer, primer, and paint it will still be a lot lighter. If it's a flight model, I'd stay away from resin cast unless it's a model that requires considerable nose weight with blow or injection molded cones.
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  #16  
Old 08-26-2017, 12:05 AM
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Thanks for all the replies... I lost my Internet access last week and only just got it back last night. Unfortunately for me, I am slammed at work right now, so I'll have to wait to check out all the links.
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  #17  
Old 08-26-2017, 12:23 AM
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Quote:
Originally Posted by tbzep
For a display model, yes. But for flying, those things are really heavy. I can finish a balsa nose cone that you can't tell from plastic unless you pull it out of the tube, and even with the sealer, primer, and paint it will still be a lot lighter. If it's a flight model, I'd stay away from resin cast unless it's a model that requires considerable nose weight with blow or injection molded cones.
The ones I ordered (two #7 and one #8 nose cone) are hollow-cast, and they're just slightly heavier than the injection-molded original ones. The solid-cast polyurethane ones, though, are considerably more massive than the originals; they only make the smaller ones (#5 size and one or two short #7 size ones) as solid-cast nose cones (one exception is their 1:100 scale Apollo capsules, which are solid-cast because they serve as "built-in ballast" in Saturn and Little Joe II models).
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Black Shire--Draft horse in human form, model rocketeer, occasional mystic, and writer, see:
http://www.lulu.com/content/paperba...an-form/8075185
http://www.lulu.com/product/cd/what...of-2%29/6122050
http://www.lulu.com/product/cd/what...of-2%29/6126511
All of my book proceeds go to the Northcote Heavy Horse Centre www.northcotehorses.com.
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  #18  
Old 08-26-2017, 09:23 AM
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I'm a bit late to this party, but finally got to look up what I had - these are the reference dimensions I have for the Groove Tube:

Centuri 'Groove Tube' #KA-11

Q Desc Stk Num Size Other

1 Nosecone 2 part plastic PNC-89 .865 .908 4.6 Red
1 Shock Cord SC-18 1/8" x 16" Rubber
1 Shock Cord Fastener SCF-1 Self Stick
1 Parachute CP-12A 12" Yel/Blk
1 Body Tube ST-818 13" Cut off 5"
6 Stabilizing Tubes ST-83 3"
1 Thrust Ring TR-7
1 Centering Ring HTC-8 1"
1 Engine Tube ST-73 3"
1 Engine Lock ? metal clip
1 Foil Tape DC-33 4" X 1" Chrome Mylar

At one point, Gordie had decals for both the Centuri model (built with Semroc parts) and for the BT-60 upscale. He may still have some in inventory or have limited capability to print them - you might want to check with him.
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  #19  
Old 08-27-2017, 08:23 AM
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Quote:
Originally Posted by gpoehlein
I'm a bit late to this party, but finally got to look up what I had - these are the reference dimensions I have for the Groove Tube:

Centuri 'Groove Tube' #KA-11

Q Desc Stk Num Size Other

1 Nosecone 2 part plastic PNC-89 .865 .908 4.6 Red
1 Shock Cord SC-18 1/8" x 16" Rubber
1 Shock Cord Fastener SCF-1 Self Stick
1 Parachute CP-12A 12" Yel/Blk
1 Body Tube ST-818 13" Cut off 5"
6 Stabilizing Tubes ST-83 3"
1 Thrust Ring TR-7
1 Centering Ring HTC-8 1"
1 Engine Tube ST-73 3"
1 Engine Lock ? metal clip
1 Foil Tape DC-33 4" X 1" Chrome Mylar

At one point, Gordie had decals for both the Centuri model (built with Semroc parts) and for the BT-60 upscale. He may still have some in inventory or have limited capability to print them - you might want to check with him.


Hi Greg,

Thanks for the info. That gets me further along than anything else I'd found.

I doubt that Gord would ever sell to me again (even if I wanted to buy from him). Same thing goes for Don.
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Dreaming of making the rockets I dreamed of as a kid (and then some).

"The Guide says there is an art to flying", said Ford, "or rather a knack."
"The knack lies in learning how to throw yourself at the ground and miss."


Launching is Optional... Landing? That Depends on Trees.
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