Ninja-B refers to a stock Estes Ninja with one small modification:
the motor mount, fins, and launch lug were all moved back 19mm to accomodate
a 19mm length boattail, reducing from the BT-20 OD of the body to the BT-5
OD of the motor mount. This boattail was made with a shroud pattern printed
1.64, with a slot cut to accomodate the Estes motor latch. The first
flight of this model made it clear that the delay in the A3-4T is much
too short; the deployment forces opened a snap swivel rated at 10 lbs and
the nose cone was lost, though it was later recovered.
This model, BTW, came to me by way of answering a challenge put
forth on rec.models.rockets by Les
Troyer, to give the proper pseudonym to which a quote in his .sig was attributable.
Dead simple for anyone who's seen The Yellow Submarine, but I guess
that's a bit old for many modern rocketeers .
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