> You'll need more noseweight, and as Cato has pointed out you may need
> stringers to bear this load (This wasn't an issue with Broadsword or
> Silver Comet since they are shorter and lighter).
What generally happens is that additional nose-weight (or, for that
matter, even the *stock* weight capsule) will be driven down into the SM
body tube by the acceleration due to launch (with the more powerful
motor -- and I mean E15 here). This is the reason for the 'table' (i.e.
1.5" o.d. x 1.2"+- i.d. x 1/32" plywood 'ring' glued inside the SM body
tube -- supported by 4 or 6 1/16" balsa 'stringers' down thru the entire
length of the SM body tube.) The Apollo capsule rests directly on this
(and, thereby, NOT *directly* on the SM body tube - held off, oh, maybe
1/32" or 1/64" from 'firm set' on the body tube). Of course, it is
*real* easy for the capsule to then be 'ejected' by the deceleration of
normal recovery ejection forces and demands, thereby, some kind of
restrainer strap or some such to HOLD it in place. What I did was epoxy
a 1/4" or 3/8" birch dowel into the center of the Apollo capsule
(packing clay and lead shot around it - in epoxy) and then a small***
eye screws into this (holding the capsule bottom 'cap' in place all the
while). This***eye is then the 'catchment' for a piece of .060"
piano wire (hook in end thru eye) that is then anchored back into the
base of the SM body tube (i.e. aft end). I threaded the piano wire
(0-80?? something) and had a 'cross piece' that this end of the piano
wire held against - tightened down with that 0-80 nut and washer. The
vehicle could go thru some pretty wild gyrations and that Apollo capsule
was going NOwhere <g>. Other methods of anchorage are equally workable
-- but be not fooled, if that capsule (resting on a 'table') isn't
secured, you WILL lose it at ejection.
Likewise -- these same forces that can jamb the capsule into the SM body
can do similar damage with the conical (paper) transitions (SM to S-IVB
and S-IVB to S-II). This is where the additional (and larger) stringers
carry the load -- holding each successive part about that same 1/32" OFF
of 'dead bottom' (bearing).
In effect, ALL the loading of each UPPER part is carried by these
stringers to each successive lower part -- all the way back to the main
centering rings (which I kind of 'beefed' the most forward and most aft
It sounds complicated, but it doesn't add 10 or 20 grams of weight to
the model -- and is really rather simple to implement.