I need to bond my CF fins to my CF airframe and as always, I could use your help. The fins will be
solid CF around .125 thick made from 6K IM7 twill fabric .015 thick. There will be 8 layers of fabric
with 2 layers at 0 degrees, 2 at 45, 2 at 90, and 2 at 135. They wont be in that exact order when
layed up with Duralco 4461SS. The shape is in pic. Its a 4 inch MD CF airframe and the fin root chord
is 15 inches, span 4.5, leading edge sweep is 12.75, tip cord is 1.25. There will be 4 fins on this
rocket.
My game plan as of right now is to tack fins on to airframe. Then create L brackets on each side of
fin with thin unicarbon ( three or four layers) that only go about .3125 up fin and onto airframe and
run the lentgh of the fin. I will try to vacuum bag the L brackets section if I can. Then when I put
the fillets on each side of fin, they will cover up the L brackets completly. After the fillets comes
the 2 or 3 layers of T2T.
The things in question are: the type and thickness of CF for the L brackets and the T2T.
is the L bracket design a good or bad idea to begin with.
This will be an extreme flight pushing high mach (3+) at low altitude, thus the need to hang on to my
fins! They are highly swept back leading edges to minumize drag and maxamize speed. Its basicly a
5800 wraped in carbon fiber with a VK fiberglass nose cone. My goal here is to tame the 5800 with
composites and live to tell the story with HD video. Every second that goes by after launch this
flight will cross a new mach number. 1 sec into flight, mach 1 at 600 feet. 2 sec into flight, mach 2
at 2200 feet. 3.3 sec into flight, mach 3, at only around 6000 feet. It will take the next 35k feet
to bleed off all that energy that was generated in the first 3.3 seconds of flight!! And I built this
on my kitchen table. Truely amazing to me if I can pull this off!
Of course it may never happen without your help and guidance. As always I'm open to any advise that
anybody is willing to offer. There is only one thing that I dont want to hear, and that is SLOW Down!
All epoxy used will have a high Tg such as products from Duralco.
Wont let me upload jpg of fin.
solid CF around .125 thick made from 6K IM7 twill fabric .015 thick. There will be 8 layers of fabric
with 2 layers at 0 degrees, 2 at 45, 2 at 90, and 2 at 135. They wont be in that exact order when
layed up with Duralco 4461SS. The shape is in pic. Its a 4 inch MD CF airframe and the fin root chord
is 15 inches, span 4.5, leading edge sweep is 12.75, tip cord is 1.25. There will be 4 fins on this
rocket.
My game plan as of right now is to tack fins on to airframe. Then create L brackets on each side of
fin with thin unicarbon ( three or four layers) that only go about .3125 up fin and onto airframe and
run the lentgh of the fin. I will try to vacuum bag the L brackets section if I can. Then when I put
the fillets on each side of fin, they will cover up the L brackets completly. After the fillets comes
the 2 or 3 layers of T2T.
The things in question are: the type and thickness of CF for the L brackets and the T2T.
is the L bracket design a good or bad idea to begin with.
This will be an extreme flight pushing high mach (3+) at low altitude, thus the need to hang on to my
fins! They are highly swept back leading edges to minumize drag and maxamize speed. Its basicly a
5800 wraped in carbon fiber with a VK fiberglass nose cone. My goal here is to tame the 5800 with
composites and live to tell the story with HD video. Every second that goes by after launch this
flight will cross a new mach number. 1 sec into flight, mach 1 at 600 feet. 2 sec into flight, mach 2
at 2200 feet. 3.3 sec into flight, mach 3, at only around 6000 feet. It will take the next 35k feet
to bleed off all that energy that was generated in the first 3.3 seconds of flight!! And I built this
on my kitchen table. Truely amazing to me if I can pull this off!
Of course it may never happen without your help and guidance. As always I'm open to any advise that
anybody is willing to offer. There is only one thing that I dont want to hear, and that is SLOW Down!
All epoxy used will have a high Tg such as products from Duralco.
Wont let me upload jpg of fin.