Filling the spiral "gap" in body tubes.

Filling the spiral "gap" in body tubes.

Post by Eric Mahe » Tue, 28 Jan 1997 04:00:00



On my most recent projects, I have considered filling in the thin spiral
"gap" on the body tubes to give the rocket a much smoother (and hopefully
more aerodynamic) finish.  Can anyone give advice on what material can be
used for this purpose, and how it should be applied?

-Eric

 
 
 

Filling the spiral "gap" in body tubes.

Post by Doyle Tatu » Tue, 28 Jan 1997 04:00:00


Quote:

> On my most recent projects, I have considered filling in the thin
> spiral "gap" on the body tubes

Try Elmers Fill N Finish Putty for Light Wood (comes
in a white tub with an orange lid). Mix some in a
little water (very little) to make an elmers glue
consistency paste. Paint on with a brush, sand and
repeat until satisfied. (Brush washes out with water
and no bad smells). Prime coat and sand the rocket
prior to the finishing coats of paint and the spiraling
stripes you'll create, will go away.
I used this method on my Sidewinder and it looks great!
--
                Doyle Tatum, RCDD

Member #554 NASA                http://www.mindspring.com/~doylex

 
 
 

Filling the spiral "gap" in body tubes.

Post by Larry W. Hardi » Wed, 29 Jan 1997 04:00:00


Quote:

> On my most recent projects, I have considered filling in the thin spiral
> "gap" on the body tubes to give the rocket a much smoother (and hopefully
> more aerodynamic) finish.  Can anyone give advice on what material can be
> used for this purpose, and how it should be applied?

> -EricTry "Perfect Paint" brand white primer which is sold in hobby shops

that cater to the RC crowd.  I have used it to fill body tube seams
as well as the weave of a Kevlar fuselage for a glider.  Just spray
it on and sand off as much as you can.  Repeat until the seam is filled
and then give a last thin coat to get everything to a uniform color
before painting.  This is compatible with Krylon, Testor's Model Master
Enamels, and Formula-U polyurethane.  I like the Formula-U for the
high gloss, but it is really easy to get runs with it. :-(

Larry Hardin

 
 
 

Filling the spiral "gap" in body tubes.

Post by Larry Basket » Wed, 29 Jan 1997 04:00:00


Actually, I like to use Fill'N'Finish straight out of the tub.  I apply it
directly with my finger, mashing it into the spiral a little.  I sand it
when it's dry, and only a little additional touch-up work is necessary.

Any time I can get my fingers directly involved and make a mess, I go for
it.  For me, it's a big part of the fun of building model rockets!

-Larry

Quote:


> > On my most recent projects, I have considered filling in the thin
> > spiral "gap" on the body tubes

> Try Elmers Fill N Finish Putty for Light Wood (comes
> in a white tub with an orange lid). Mix some in a
> little water (very little) to make an elmers glue
> consistency paste. Paint on with a brush, sand and
> repeat until satisfied. (Brush washes out with water
> and no bad smells). Prime coat and sand the rocket
> prior to the finishing coats of paint and the spiraling
> stripes you'll create, will go away.
> I used this method on my Sidewinder and it looks great!

        _         =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
       / \
      |   |       Larry Baskett
      |   |

      |   |       http://www-leland.stanford.edu/~lbaskett/
     /| | |\
    / | | | \     NAR #60166
   /  | | |  \    LUNAR #151
  /   |_|_|   \
 /   /  |  \   \  =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
 \__/   |   \__/
 
 
 

Filling the spiral "gap" in body tubes.

Post by Paul Lawrence Hamilt » Thu, 30 Jan 1997 04:00:00


I like to use a paste of balsa dust (the stuff you produce when you
make or shape fines and nosecones) and clear dope.  It is the lightest
and cheapest filler.
Paul Lawrence Hamilton
Samis & Hamilton
Airport and Aviation Consultants
(301) 299-3573

 
 
 

Filling the spiral "gap" in body tubes.

Post by v.. » Thu, 30 Jan 1997 04:00:00


Quote:

> On my most recent projects, I have considered filling in the thin spiral
> "gap" on the body tubes to give the rocket a much smoother (and hopefully
> more aerodynamic) finish.  Can anyone give advice on what material can be
> used for this purpose, and how it should be applied?

> -EricI've used a two stage automotive spot putty in many of my progects with

excellant results.It is very light when curred,its strong,does not shrink
and best of all it is verry easy to sand.The brand I use is Sikkens but
many other auto paint manufactures make simular products.
 
 
 

Filling the spiral "gap" in body tubes.

Post by Brian E. Robins » Fri, 31 Jan 1997 04:00:00


Quote:
>> I like to use a paste of balsa dust (the stuff you produce when you

make or shape fines and nosecones)... <<

Hmmm. Nowadays that would make plastic dust...

 
 
 

Filling the spiral "gap" in body tubes.

Post by Foxe » Fri, 31 Jan 1997 23:43:00


I usually use Elmers stuff Professional Carpenters Wood Filler thats
in the White bucket with orange lid and have had good results.  Elmers
also makes Fill N Finish which is also in the same color of bucket,
but it has not been as good as the Carpenter Wood Filler, to me the
Fill N Finish is coarser in texture and don't spread as easy.  I have
had problems filling the Broadswoards spiral groves, as it seemed that
either of the two just did not want to stay in the groves, sort of
like it was not fine enough as this BT has very shallow grooves, so I
just primered the tube a few times and used autobody glazing spot
(red lacquar) putty, and sanded with 280 then primed again and sanded
with 400, primed again and finished with 0000 steel wool and 600 grit
paper.  I used Black Baron primer, and Lustercoat finish and you can
comb your hair in the finish.