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  #11  
Old 08-13-2022, 09:40 AM
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Quote:
Originally Posted by SEL
Thatís the blade I used to do this - worked reel good!


Ah chihuahua! Is that infected?
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  #12  
Old 08-13-2022, 10:11 AM
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You can get a longer blade by extending out one of the cheap break-off blade knives.
Here's a blog post showing a smaller nose cone.
https://modelrocketbuilding.blogspo...ur-build_5.html

The same technique works for larger nose cones,
Start with the blade short and make a shallow cut around the nose cone in a straight line,
Extend your knife blade to cut closer to the center,
Continue until the nose cone splits.

Keep your hands clear of the long blade - It can slip.
Don't use too much pressure - that blade might break off.
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  #13  
Old 08-13-2022, 11:49 AM
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Quote:
Originally Posted by jeffyjeep
Ah chihuahua! Is that infected?


No - it looks pretty nasty, but this is after itís was cleaned and stitched
At the ER. I was trying to carve a balsa block and the blade slipped.
Ď15-16 years ago I think.
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  #14  
Old 08-13-2022, 12:15 PM
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Quote:
Originally Posted by hcmbanjo
[Ö]
You can get a longer blade by extending out one of the cheap break-off blade knives.

[Ö]


Great idea! I now have those break-off blade knives in two sizes. Love them!

I may just go cut a cone in half to try it.
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  #15  
Old 08-14-2022, 10:17 AM
jdbectec jdbectec is offline
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When I built my Whee II clone I used the current pnc -60ms nose comes and simply lengthened the tube to make up the difference in the length of the cones.As I recall the fin pattern worked surprisingly well.
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  #16  
Old 08-14-2022, 10:57 AM
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Quote:
Originally Posted by jdbectec
When I built my Whee II clone I used the current pnc -60ms nose comes and simply lengthened the tube to make up the difference in the length of the cones.As I recall the fin pattern worked surprisingly well.


Thatís brilliant! Is the PNC-60MS the Big Bertha cone?
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  #17  
Old 08-14-2022, 02:55 PM
shockwaveriderz shockwaveriderz is offline
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Heck just 3d print a hollow tail cone.
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  #18  
Old 08-15-2022, 07:18 AM
jdbectec jdbectec is offline
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Quote:
Originally Posted by jeffyjeep
Thatís brilliant! Is the PNC-60MS the Big Bertha cone?



Thanks! Yes,it's the cone currently used in the Big Bertha etc.
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  #19  
Old 08-15-2022, 11:37 AM
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The really long X-Acto knife blade for #6, #5, and #2 handles is the #26 blade.
The #2 and #33 blades would also work well for splitting cones.

I believe the #26 blade is still easily found on ebay. I have at least a dozen of them.
They can be really dangerous to work with. I prefer both the #33 and #2 over the #26.
The #26 is best used for rough shaping balsa blocks and whittling.
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  #20  
Old 09-24-2022, 04:07 PM
slant-six slant-six is offline
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Thanks guys! I went with the long break off blade idea. It worked well. I used two BNC-60L nose cones.
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